/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2018 Facebook */
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#include <uapi/linux/btf.h>
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/bpf_perf_event.h>
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#include <uapi/linux/types.h>
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#include <linux/seq_file.h>
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#include <linux/compiler.h>
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#include <linux/ctype.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include <linux/file.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/idr.h>
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#include <linux/sort.h>
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#include <linux/bpf_verifier.h>
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#include <linux/btf.h>
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#include <linux/btf_ids.h>
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#include <linux/skmsg.h>
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#include <linux/perf_event.h>
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#include <linux/bsearch.h>
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#include <linux/btf_ids.h>
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#include <net/sock.h>
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/* BTF (BPF Type Format) is the meta data format which describes
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* the data types of BPF program/map. Hence, it basically focus
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* on the C programming language which the modern BPF is primary
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* using.
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*
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* ELF Section:
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* ~~~~~~~~~~~
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* The BTF data is stored under the ".BTF" ELF section
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*
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* struct btf_type:
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* ~~~~~~~~~~~~~~~
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* Each 'struct btf_type' object describes a C data type.
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* Depending on the type it is describing, a 'struct btf_type'
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* object may be followed by more data. F.e.
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* To describe an array, 'struct btf_type' is followed by
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* 'struct btf_array'.
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*
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* 'struct btf_type' and any extra data following it are
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* 4 bytes aligned.
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*
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* Type section:
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* ~~~~~~~~~~~~~
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* The BTF type section contains a list of 'struct btf_type' objects.
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* Each one describes a C type. Recall from the above section
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* that a 'struct btf_type' object could be immediately followed by extra
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* data in order to desribe some particular C types.
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*
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* type_id:
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* ~~~~~~~
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* Each btf_type object is identified by a type_id. The type_id
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* is implicitly implied by the location of the btf_type object in
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* the BTF type section. The first one has type_id 1. The second
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* one has type_id 2...etc. Hence, an earlier btf_type has
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* a smaller type_id.
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*
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* A btf_type object may refer to another btf_type object by using
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* type_id (i.e. the "type" in the "struct btf_type").
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*
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* NOTE that we cannot assume any reference-order.
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* A btf_type object can refer to an earlier btf_type object
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* but it can also refer to a later btf_type object.
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*
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* For example, to describe "const void *". A btf_type
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* object describing "const" may refer to another btf_type
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* object describing "void *". This type-reference is done
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* by specifying type_id:
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*
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* [1] CONST (anon) type_id=2
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* [2] PTR (anon) type_id=0
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*
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* The above is the btf_verifier debug log:
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* - Each line started with "[?]" is a btf_type object
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* - [?] is the type_id of the btf_type object.
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* - CONST/PTR is the BTF_KIND_XXX
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* - "(anon)" is the name of the type. It just
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* happens that CONST and PTR has no name.
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* - type_id=XXX is the 'u32 type' in btf_type
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*
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* NOTE: "void" has type_id 0
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*
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* String section:
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* ~~~~~~~~~~~~~~
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* The BTF string section contains the names used by the type section.
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* Each string is referred by an "offset" from the beginning of the
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* string section.
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*
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* Each string is '\0' terminated.
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*
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* The first character in the string section must be '\0'
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* which is used to mean 'anonymous'. Some btf_type may not
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* have a name.
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*/
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/* BTF verification:
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*
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* To verify BTF data, two passes are needed.
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*
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* Pass #1
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* ~~~~~~~
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* The first pass is to collect all btf_type objects to
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* an array: "btf->types".
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*
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* Depending on the C type that a btf_type is describing,
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* a btf_type may be followed by extra data. We don't know
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* how many btf_type is there, and more importantly we don't
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* know where each btf_type is located in the type section.
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*
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* Without knowing the location of each type_id, most verifications
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* cannot be done. e.g. an earlier btf_type may refer to a later
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* btf_type (recall the "const void *" above), so we cannot
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* check this type-reference in the first pass.
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*
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* In the first pass, it still does some verifications (e.g.
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* checking the name is a valid offset to the string section).
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*
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* Pass #2
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* ~~~~~~~
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* The main focus is to resolve a btf_type that is referring
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* to another type.
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*
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* We have to ensure the referring type:
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* 1) does exist in the BTF (i.e. in btf->types[])
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* 2) does not cause a loop:
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* struct A {
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* struct B b;
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* };
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*
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* struct B {
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* struct A a;
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* };
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*
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* btf_type_needs_resolve() decides if a btf_type needs
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* to be resolved.
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*
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* The needs_resolve type implements the "resolve()" ops which
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* essentially does a DFS and detects backedge.
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*
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* During resolve (or DFS), different C types have different
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* "RESOLVED" conditions.
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*
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* When resolving a BTF_KIND_STRUCT, we need to resolve all its
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* members because a member is always referring to another
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* type. A struct's member can be treated as "RESOLVED" if
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* it is referring to a BTF_KIND_PTR. Otherwise, the
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* following valid C struct would be rejected:
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*
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* struct A {
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* int m;
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* struct A *a;
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* };
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*
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* When resolving a BTF_KIND_PTR, it needs to keep resolving if
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* it is referring to another BTF_KIND_PTR. Otherwise, we cannot
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* detect a pointer loop, e.g.:
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* BTF_KIND_CONST -> BTF_KIND_PTR -> BTF_KIND_CONST -> BTF_KIND_PTR +
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* ^ |
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* +-----------------------------------------+
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*
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*/
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#define BITS_PER_U128 (sizeof(u64) * BITS_PER_BYTE * 2)
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#define BITS_PER_BYTE_MASK (BITS_PER_BYTE - 1)
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#define BITS_PER_BYTE_MASKED(bits) ((bits) & BITS_PER_BYTE_MASK)
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#define BITS_ROUNDDOWN_BYTES(bits) ((bits) >> 3)
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#define BITS_ROUNDUP_BYTES(bits) \
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(BITS_ROUNDDOWN_BYTES(bits) + !!BITS_PER_BYTE_MASKED(bits))
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#define BTF_INFO_MASK 0x8f00ffff
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#define BTF_INT_MASK 0x0fffffff
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#define BTF_TYPE_ID_VALID(type_id) ((type_id) <= BTF_MAX_TYPE)
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#define BTF_STR_OFFSET_VALID(name_off) ((name_off) <= BTF_MAX_NAME_OFFSET)
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/* 16MB for 64k structs and each has 16 members and
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* a few MB spaces for the string section.
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* The hard limit is S32_MAX.
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*/
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#define BTF_MAX_SIZE (16 * 1024 * 1024)
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#define for_each_member_from(i, from, struct_type, member) \
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for (i = from, member = btf_type_member(struct_type) + from; \
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i < btf_type_vlen(struct_type); \
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i++, member++)
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#define for_each_vsi_from(i, from, struct_type, member) \
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for (i = from, member = btf_type_var_secinfo(struct_type) + from; \
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i < btf_type_vlen(struct_type); \
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i++, member++)
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DEFINE_IDR(btf_idr);
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DEFINE_SPINLOCK(btf_idr_lock);
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struct btf {
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void *data;
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struct btf_type **types;
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u32 *resolved_ids;
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u32 *resolved_sizes;
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const char *strings;
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void *nohdr_data;
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struct btf_header hdr;
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u32 nr_types;
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u32 types_size;
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u32 data_size;
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refcount_t refcnt;
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u32 id;
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struct rcu_head rcu;
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};
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enum verifier_phase {
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CHECK_META,
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CHECK_TYPE,
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};
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struct resolve_vertex {
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const struct btf_type *t;
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u32 type_id;
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u16 next_member;
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};
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enum visit_state {
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NOT_VISITED,
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VISITED,
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RESOLVED,
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};
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enum resolve_mode {
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RESOLVE_TBD, /* To Be Determined */
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RESOLVE_PTR, /* Resolving for Pointer */
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RESOLVE_STRUCT_OR_ARRAY, /* Resolving for struct/union
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* or array
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*/
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};
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#define MAX_RESOLVE_DEPTH 32
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struct btf_sec_info {
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u32 off;
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u32 len;
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};
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struct btf_verifier_env {
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struct btf *btf;
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u8 *visit_states;
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struct resolve_vertex stack[MAX_RESOLVE_DEPTH];
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struct bpf_verifier_log log;
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u32 log_type_id;
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u32 top_stack;
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enum verifier_phase phase;
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enum resolve_mode resolve_mode;
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};
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static const char * const btf_kind_str[NR_BTF_KINDS] = {
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[BTF_KIND_UNKN] = "UNKNOWN",
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[BTF_KIND_INT] = "INT",
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[BTF_KIND_PTR] = "PTR",
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[BTF_KIND_ARRAY] = "ARRAY",
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[BTF_KIND_STRUCT] = "STRUCT",
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[BTF_KIND_UNION] = "UNION",
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[BTF_KIND_ENUM] = "ENUM",
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[BTF_KIND_FWD] = "FWD",
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[BTF_KIND_TYPEDEF] = "TYPEDEF",
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[BTF_KIND_VOLATILE] = "VOLATILE",
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[BTF_KIND_CONST] = "CONST",
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[BTF_KIND_RESTRICT] = "RESTRICT",
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[BTF_KIND_FUNC] = "FUNC",
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[BTF_KIND_FUNC_PROTO] = "FUNC_PROTO",
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[BTF_KIND_VAR] = "VAR",
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[BTF_KIND_DATASEC] = "DATASEC",
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};
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static const char *btf_type_str(const struct btf_type *t)
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{
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return btf_kind_str[BTF_INFO_KIND(t->info)];
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}
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/* Chunk size we use in safe copy of data to be shown. */
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#define BTF_SHOW_OBJ_SAFE_SIZE 32
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/*
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* This is the maximum size of a base type value (equivalent to a
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* 128-bit int); if we are at the end of our safe buffer and have
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* less than 16 bytes space we can't be assured of being able
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* to copy the next type safely, so in such cases we will initiate
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* a new copy.
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*/
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#define BTF_SHOW_OBJ_BASE_TYPE_SIZE 16
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/* Type name size */
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#define BTF_SHOW_NAME_SIZE 80
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/*
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* Common data to all BTF show operations. Private show functions can add
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* their own data to a structure containing a struct btf_show and consult it
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* in the show callback. See btf_type_show() below.
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*
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* One challenge with showing nested data is we want to skip 0-valued
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* data, but in order to figure out whether a nested object is all zeros
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* we need to walk through it. As a result, we need to make two passes
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* when handling structs, unions and arrays; the first path simply looks
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* for nonzero data, while the second actually does the display. The first
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* pass is signalled by show->state.depth_check being set, and if we
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* encounter a non-zero value we set show->state.depth_to_show to
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* the depth at which we encountered it. When we have completed the
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* first pass, we will know if anything needs to be displayed if
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* depth_to_show > depth. See btf_[struct,array]_show() for the
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* implementation of this.
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*
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* Another problem is we want to ensure the data for display is safe to
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* access. To support this, the anonymous "struct {} obj" tracks the data
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* object and our safe copy of it. We copy portions of the data needed
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* to the object "copy" buffer, but because its size is limited to
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* BTF_SHOW_OBJ_COPY_LEN bytes, multiple copies may be required as we
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* traverse larger objects for display.
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*
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* The various data type show functions all start with a call to
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* btf_show_start_type() which returns a pointer to the safe copy
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* of the data needed (or if BTF_SHOW_UNSAFE is specified, to the
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* raw data itself). btf_show_obj_safe() is responsible for
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* using copy_from_kernel_nofault() to update the safe data if necessary
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* as we traverse the object's data. skbuff-like semantics are
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* used:
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*
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* - obj.head points to the start of the toplevel object for display
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* - obj.size is the size of the toplevel object
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* - obj.data points to the current point in the original data at
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* which our safe data starts. obj.data will advance as we copy
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* portions of the data.
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*
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* In most cases a single copy will suffice, but larger data structures
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* such as "struct task_struct" will require many copies. The logic in
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* btf_show_obj_safe() handles the logic that determines if a new
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* copy_from_kernel_nofault() is needed.
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*/
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struct btf_show {
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u64 flags;
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void *target; /* target of show operation (seq file, buffer) */
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void (*showfn)(struct btf_show *show, const char *fmt, va_list args);
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const struct btf *btf;
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/* below are used during iteration */
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struct {
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u8 depth;
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u8 depth_to_show;
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u8 depth_check;
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u8 array_member:1,
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array_terminated:1;
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u16 array_encoding;
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u32 type_id;
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int status; /* non-zero for error */
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const struct btf_type *type;
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const struct btf_member *member;
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char name[BTF_SHOW_NAME_SIZE]; /* space for member name/type */
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} state;
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struct {
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u32 size;
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void *head;
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void *data;
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u8 safe[BTF_SHOW_OBJ_SAFE_SIZE];
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} obj;
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};
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struct btf_kind_operations {
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s32 (*check_meta)(struct btf_verifier_env *env,
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const struct btf_type *t,
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u32 meta_left);
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int (*resolve)(struct btf_verifier_env *env,
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const struct resolve_vertex *v);
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int (*check_member)(struct btf_verifier_env *env,
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const struct btf_type *struct_type,
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const struct btf_member *member,
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const struct btf_type *member_type);
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int (*check_kflag_member)(struct btf_verifier_env *env,
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const struct btf_type *struct_type,
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const struct btf_member *member,
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const struct btf_type *member_type);
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void (*log_details)(struct btf_verifier_env *env,
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const struct btf_type *t);
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void (*show)(const struct btf *btf, const struct btf_type *t,
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u32 type_id, void *data, u8 bits_offsets,
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struct btf_show *show);
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};
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static const struct btf_kind_operations * const kind_ops[NR_BTF_KINDS];
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static struct btf_type btf_void;
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static int btf_resolve(struct btf_verifier_env *env,
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const struct btf_type *t, u32 type_id);
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static bool btf_type_is_modifier(const struct btf_type *t)
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{
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/* Some of them is not strictly a C modifier
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* but they are grouped into the same bucket
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* for BTF concern:
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* A type (t) that refers to another
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* type through t->type AND its size cannot
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* be determined without following the t->type.
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*
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* ptr does not fall into this bucket
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* because its size is always sizeof(void *).
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*/
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switch (BTF_INFO_KIND(t->info)) {
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case BTF_KIND_TYPEDEF:
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case BTF_KIND_VOLATILE:
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case BTF_KIND_CONST:
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case BTF_KIND_RESTRICT:
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return true;
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}
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return false;
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}
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bool btf_type_is_void(const struct btf_type *t)
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{
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return t == &btf_void;
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}
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static bool btf_type_is_fwd(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_FWD;
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}
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static bool btf_type_nosize(const struct btf_type *t)
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{
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return btf_type_is_void(t) || btf_type_is_fwd(t) ||
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btf_type_is_func(t) || btf_type_is_func_proto(t);
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}
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static bool btf_type_nosize_or_null(const struct btf_type *t)
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{
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return !t || btf_type_nosize(t);
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}
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static bool __btf_type_is_struct(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_STRUCT;
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}
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static bool btf_type_is_array(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_ARRAY;
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}
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static bool btf_type_is_datasec(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_DATASEC;
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}
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s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind)
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{
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const struct btf_type *t;
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const char *tname;
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u32 i;
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for (i = 1; i <= btf->nr_types; i++) {
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t = btf->types[i];
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if (BTF_INFO_KIND(t->info) != kind)
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continue;
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tname = btf_name_by_offset(btf, t->name_off);
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if (!strcmp(tname, name))
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return i;
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}
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return -ENOENT;
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}
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const struct btf_type *btf_type_skip_modifiers(const struct btf *btf,
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u32 id, u32 *res_id)
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{
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const struct btf_type *t = btf_type_by_id(btf, id);
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while (btf_type_is_modifier(t)) {
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id = t->type;
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t = btf_type_by_id(btf, t->type);
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}
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if (res_id)
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*res_id = id;
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return t;
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}
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const struct btf_type *btf_type_resolve_ptr(const struct btf *btf,
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u32 id, u32 *res_id)
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{
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const struct btf_type *t;
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t = btf_type_skip_modifiers(btf, id, NULL);
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if (!btf_type_is_ptr(t))
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return NULL;
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return btf_type_skip_modifiers(btf, t->type, res_id);
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}
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const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf,
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u32 id, u32 *res_id)
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{
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const struct btf_type *ptype;
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ptype = btf_type_resolve_ptr(btf, id, res_id);
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if (ptype && btf_type_is_func_proto(ptype))
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return ptype;
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return NULL;
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}
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/* Types that act only as a source, not sink or intermediate
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* type when resolving.
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*/
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static bool btf_type_is_resolve_source_only(const struct btf_type *t)
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{
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return btf_type_is_var(t) ||
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btf_type_is_datasec(t);
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}
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/* What types need to be resolved?
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*
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* btf_type_is_modifier() is an obvious one.
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*
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* btf_type_is_struct() because its member refers to
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* another type (through member->type).
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*
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* btf_type_is_var() because the variable refers to
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* another type. btf_type_is_datasec() holds multiple
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* btf_type_is_var() types that need resolving.
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*
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* btf_type_is_array() because its element (array->type)
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* refers to another type. Array can be thought of a
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* special case of struct while array just has the same
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* member-type repeated by array->nelems of times.
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*/
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static bool btf_type_needs_resolve(const struct btf_type *t)
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{
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return btf_type_is_modifier(t) ||
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btf_type_is_ptr(t) ||
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btf_type_is_struct(t) ||
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btf_type_is_array(t) ||
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btf_type_is_var(t) ||
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btf_type_is_datasec(t);
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}
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/* t->size can be used */
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static bool btf_type_has_size(const struct btf_type *t)
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{
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switch (BTF_INFO_KIND(t->info)) {
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case BTF_KIND_INT:
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case BTF_KIND_STRUCT:
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case BTF_KIND_UNION:
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case BTF_KIND_ENUM:
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case BTF_KIND_DATASEC:
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return true;
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}
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return false;
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}
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static const char *btf_int_encoding_str(u8 encoding)
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{
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if (encoding == 0)
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return "(none)";
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else if (encoding == BTF_INT_SIGNED)
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return "SIGNED";
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else if (encoding == BTF_INT_CHAR)
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return "CHAR";
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else if (encoding == BTF_INT_BOOL)
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return "BOOL";
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else
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return "UNKN";
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}
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static u32 btf_type_int(const struct btf_type *t)
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{
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return *(u32 *)(t + 1);
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}
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static const struct btf_array *btf_type_array(const struct btf_type *t)
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{
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return (const struct btf_array *)(t + 1);
|
}
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static const struct btf_enum *btf_type_enum(const struct btf_type *t)
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{
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return (const struct btf_enum *)(t + 1);
|
}
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static const struct btf_var *btf_type_var(const struct btf_type *t)
|
{
|
return (const struct btf_var *)(t + 1);
|
}
|
|
static const struct btf_kind_operations *btf_type_ops(const struct btf_type *t)
|
{
|
return kind_ops[BTF_INFO_KIND(t->info)];
|
}
|
|
static bool btf_name_offset_valid(const struct btf *btf, u32 offset)
|
{
|
return BTF_STR_OFFSET_VALID(offset) &&
|
offset < btf->hdr.str_len;
|
}
|
|
static bool __btf_name_char_ok(char c, bool first, bool dot_ok)
|
{
|
if ((first ? !isalpha(c) :
|
!isalnum(c)) &&
|
c != '_' &&
|
((c == '.' && !dot_ok) ||
|
c != '.'))
|
return false;
|
return true;
|
}
|
|
static bool __btf_name_valid(const struct btf *btf, u32 offset, bool dot_ok)
|
{
|
/* offset must be valid */
|
const char *src = &btf->strings[offset];
|
const char *src_limit;
|
|
if (!__btf_name_char_ok(*src, true, dot_ok))
|
return false;
|
|
/* set a limit on identifier length */
|
src_limit = src + KSYM_NAME_LEN;
|
src++;
|
while (*src && src < src_limit) {
|
if (!__btf_name_char_ok(*src, false, dot_ok))
|
return false;
|
src++;
|
}
|
|
return !*src;
|
}
|
|
/* Only C-style identifier is permitted. This can be relaxed if
|
* necessary.
|
*/
|
static bool btf_name_valid_identifier(const struct btf *btf, u32 offset)
|
{
|
return __btf_name_valid(btf, offset, false);
|
}
|
|
static bool btf_name_valid_section(const struct btf *btf, u32 offset)
|
{
|
return __btf_name_valid(btf, offset, true);
|
}
|
|
static const char *__btf_name_by_offset(const struct btf *btf, u32 offset)
|
{
|
if (!offset)
|
return "(anon)";
|
else if (offset < btf->hdr.str_len)
|
return &btf->strings[offset];
|
else
|
return "(invalid-name-offset)";
|
}
|
|
const char *btf_name_by_offset(const struct btf *btf, u32 offset)
|
{
|
if (offset < btf->hdr.str_len)
|
return &btf->strings[offset];
|
|
return NULL;
|
}
|
|
const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id)
|
{
|
if (type_id > btf->nr_types)
|
return NULL;
|
|
return btf->types[type_id];
|
}
|
|
/*
|
* Regular int is not a bit field and it must be either
|
* u8/u16/u32/u64 or __int128.
|
*/
|
static bool btf_type_int_is_regular(const struct btf_type *t)
|
{
|
u8 nr_bits, nr_bytes;
|
u32 int_data;
|
|
int_data = btf_type_int(t);
|
nr_bits = BTF_INT_BITS(int_data);
|
nr_bytes = BITS_ROUNDUP_BYTES(nr_bits);
|
if (BITS_PER_BYTE_MASKED(nr_bits) ||
|
BTF_INT_OFFSET(int_data) ||
|
(nr_bytes != sizeof(u8) && nr_bytes != sizeof(u16) &&
|
nr_bytes != sizeof(u32) && nr_bytes != sizeof(u64) &&
|
nr_bytes != (2 * sizeof(u64)))) {
|
return false;
|
}
|
|
return true;
|
}
|
|
/*
|
* Check that given struct member is a regular int with expected
|
* offset and size.
|
*/
|
bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s,
|
const struct btf_member *m,
|
u32 expected_offset, u32 expected_size)
|
{
|
const struct btf_type *t;
|
u32 id, int_data;
|
u8 nr_bits;
|
|
id = m->type;
|
t = btf_type_id_size(btf, &id, NULL);
|
if (!t || !btf_type_is_int(t))
|
return false;
|
|
int_data = btf_type_int(t);
|
nr_bits = BTF_INT_BITS(int_data);
|
if (btf_type_kflag(s)) {
|
u32 bitfield_size = BTF_MEMBER_BITFIELD_SIZE(m->offset);
|
u32 bit_offset = BTF_MEMBER_BIT_OFFSET(m->offset);
|
|
/* if kflag set, int should be a regular int and
|
* bit offset should be at byte boundary.
|
*/
|
return !bitfield_size &&
|
BITS_ROUNDUP_BYTES(bit_offset) == expected_offset &&
|
BITS_ROUNDUP_BYTES(nr_bits) == expected_size;
|
}
|
|
if (BTF_INT_OFFSET(int_data) ||
|
BITS_PER_BYTE_MASKED(m->offset) ||
|
BITS_ROUNDUP_BYTES(m->offset) != expected_offset ||
|
BITS_PER_BYTE_MASKED(nr_bits) ||
|
BITS_ROUNDUP_BYTES(nr_bits) != expected_size)
|
return false;
|
|
return true;
|
}
|
|
/* Similar to btf_type_skip_modifiers() but does not skip typedefs. */
|
static const struct btf_type *btf_type_skip_qualifiers(const struct btf *btf,
|
u32 id)
|
{
|
const struct btf_type *t = btf_type_by_id(btf, id);
|
|
while (btf_type_is_modifier(t) &&
|
BTF_INFO_KIND(t->info) != BTF_KIND_TYPEDEF) {
|
id = t->type;
|
t = btf_type_by_id(btf, t->type);
|
}
|
|
return t;
|
}
|
|
#define BTF_SHOW_MAX_ITER 10
|
|
#define BTF_KIND_BIT(kind) (1ULL << kind)
|
|
/*
|
* Populate show->state.name with type name information.
|
* Format of type name is
|
*
|
* [.member_name = ] (type_name)
|
*/
|
static const char *btf_show_name(struct btf_show *show)
|
{
|
/* BTF_MAX_ITER array suffixes "[]" */
|
const char *array_suffixes = "[][][][][][][][][][]";
|
const char *array_suffix = &array_suffixes[strlen(array_suffixes)];
|
/* BTF_MAX_ITER pointer suffixes "*" */
|
const char *ptr_suffixes = "**********";
|
const char *ptr_suffix = &ptr_suffixes[strlen(ptr_suffixes)];
|
const char *name = NULL, *prefix = "", *parens = "";
|
const struct btf_member *m = show->state.member;
|
const struct btf_type *t = show->state.type;
|
const struct btf_array *array;
|
u32 id = show->state.type_id;
|
const char *member = NULL;
|
bool show_member = false;
|
u64 kinds = 0;
|
int i;
|
|
show->state.name[0] = '\0';
|
|
/*
|
* Don't show type name if we're showing an array member;
|
* in that case we show the array type so don't need to repeat
|
* ourselves for each member.
|
*/
|
if (show->state.array_member)
|
return "";
|
|
/* Retrieve member name, if any. */
|
if (m) {
|
member = btf_name_by_offset(show->btf, m->name_off);
|
show_member = strlen(member) > 0;
|
id = m->type;
|
}
|
|
/*
|
* Start with type_id, as we have resolved the struct btf_type *
|
* via btf_modifier_show() past the parent typedef to the child
|
* struct, int etc it is defined as. In such cases, the type_id
|
* still represents the starting type while the struct btf_type *
|
* in our show->state points at the resolved type of the typedef.
|
*/
|
t = btf_type_by_id(show->btf, id);
|
if (!t)
|
return "";
|
|
/*
|
* The goal here is to build up the right number of pointer and
|
* array suffixes while ensuring the type name for a typedef
|
* is represented. Along the way we accumulate a list of
|
* BTF kinds we have encountered, since these will inform later
|
* display; for example, pointer types will not require an
|
* opening "{" for struct, we will just display the pointer value.
|
*
|
* We also want to accumulate the right number of pointer or array
|
* indices in the format string while iterating until we get to
|
* the typedef/pointee/array member target type.
|
*
|
* We start by pointing at the end of pointer and array suffix
|
* strings; as we accumulate pointers and arrays we move the pointer
|
* or array string backwards so it will show the expected number of
|
* '*' or '[]' for the type. BTF_SHOW_MAX_ITER of nesting of pointers
|
* and/or arrays and typedefs are supported as a precaution.
|
*
|
* We also want to get typedef name while proceeding to resolve
|
* type it points to so that we can add parentheses if it is a
|
* "typedef struct" etc.
|
*/
|
for (i = 0; i < BTF_SHOW_MAX_ITER; i++) {
|
|
switch (BTF_INFO_KIND(t->info)) {
|
case BTF_KIND_TYPEDEF:
|
if (!name)
|
name = btf_name_by_offset(show->btf,
|
t->name_off);
|
kinds |= BTF_KIND_BIT(BTF_KIND_TYPEDEF);
|
id = t->type;
|
break;
|
case BTF_KIND_ARRAY:
|
kinds |= BTF_KIND_BIT(BTF_KIND_ARRAY);
|
parens = "[";
|
if (!t)
|
return "";
|
array = btf_type_array(t);
|
if (array_suffix > array_suffixes)
|
array_suffix -= 2;
|
id = array->type;
|
break;
|
case BTF_KIND_PTR:
|
kinds |= BTF_KIND_BIT(BTF_KIND_PTR);
|
if (ptr_suffix > ptr_suffixes)
|
ptr_suffix -= 1;
|
id = t->type;
|
break;
|
default:
|
id = 0;
|
break;
|
}
|
if (!id)
|
break;
|
t = btf_type_skip_qualifiers(show->btf, id);
|
}
|
/* We may not be able to represent this type; bail to be safe */
|
if (i == BTF_SHOW_MAX_ITER)
|
return "";
|
|
if (!name)
|
name = btf_name_by_offset(show->btf, t->name_off);
|
|
switch (BTF_INFO_KIND(t->info)) {
|
case BTF_KIND_STRUCT:
|
case BTF_KIND_UNION:
|
prefix = BTF_INFO_KIND(t->info) == BTF_KIND_STRUCT ?
|
"struct" : "union";
|
/* if it's an array of struct/union, parens is already set */
|
if (!(kinds & (BTF_KIND_BIT(BTF_KIND_ARRAY))))
|
parens = "{";
|
break;
|
case BTF_KIND_ENUM:
|
prefix = "enum";
|
break;
|
default:
|
break;
|
}
|
|
/* pointer does not require parens */
|
if (kinds & BTF_KIND_BIT(BTF_KIND_PTR))
|
parens = "";
|
/* typedef does not require struct/union/enum prefix */
|
if (kinds & BTF_KIND_BIT(BTF_KIND_TYPEDEF))
|
prefix = "";
|
|
if (!name)
|
name = "";
|
|
/* Even if we don't want type name info, we want parentheses etc */
|
if (show->flags & BTF_SHOW_NONAME)
|
snprintf(show->state.name, sizeof(show->state.name), "%s",
|
parens);
|
else
|
snprintf(show->state.name, sizeof(show->state.name),
|
"%s%s%s(%s%s%s%s%s%s)%s",
|
/* first 3 strings comprise ".member = " */
|
show_member ? "." : "",
|
show_member ? member : "",
|
show_member ? " = " : "",
|
/* ...next is our prefix (struct, enum, etc) */
|
prefix,
|
strlen(prefix) > 0 && strlen(name) > 0 ? " " : "",
|
/* ...this is the type name itself */
|
name,
|
/* ...suffixed by the appropriate '*', '[]' suffixes */
|
strlen(ptr_suffix) > 0 ? " " : "", ptr_suffix,
|
array_suffix, parens);
|
|
return show->state.name;
|
}
|
|
static const char *__btf_show_indent(struct btf_show *show)
|
{
|
const char *indents = " ";
|
const char *indent = &indents[strlen(indents)];
|
|
if ((indent - show->state.depth) >= indents)
|
return indent - show->state.depth;
|
return indents;
|
}
|
|
static const char *btf_show_indent(struct btf_show *show)
|
{
|
return show->flags & BTF_SHOW_COMPACT ? "" : __btf_show_indent(show);
|
}
|
|
static const char *btf_show_newline(struct btf_show *show)
|
{
|
return show->flags & BTF_SHOW_COMPACT ? "" : "\n";
|
}
|
|
static const char *btf_show_delim(struct btf_show *show)
|
{
|
if (show->state.depth == 0)
|
return "";
|
|
if ((show->flags & BTF_SHOW_COMPACT) && show->state.type &&
|
BTF_INFO_KIND(show->state.type->info) == BTF_KIND_UNION)
|
return "|";
|
|
return ",";
|
}
|
|
__printf(2, 3) static void btf_show(struct btf_show *show, const char *fmt, ...)
|
{
|
va_list args;
|
|
if (!show->state.depth_check) {
|
va_start(args, fmt);
|
show->showfn(show, fmt, args);
|
va_end(args);
|
}
|
}
|
|
/* Macros are used here as btf_show_type_value[s]() prepends and appends
|
* format specifiers to the format specifier passed in; these do the work of
|
* adding indentation, delimiters etc while the caller simply has to specify
|
* the type value(s) in the format specifier + value(s).
|
*/
|
#define btf_show_type_value(show, fmt, value) \
|
do { \
|
if ((value) != 0 || (show->flags & BTF_SHOW_ZERO) || \
|
show->state.depth == 0) { \
|
btf_show(show, "%s%s" fmt "%s%s", \
|
btf_show_indent(show), \
|
btf_show_name(show), \
|
value, btf_show_delim(show), \
|
btf_show_newline(show)); \
|
if (show->state.depth > show->state.depth_to_show) \
|
show->state.depth_to_show = show->state.depth; \
|
} \
|
} while (0)
|
|
#define btf_show_type_values(show, fmt, ...) \
|
do { \
|
btf_show(show, "%s%s" fmt "%s%s", btf_show_indent(show), \
|
btf_show_name(show), \
|
__VA_ARGS__, btf_show_delim(show), \
|
btf_show_newline(show)); \
|
if (show->state.depth > show->state.depth_to_show) \
|
show->state.depth_to_show = show->state.depth; \
|
} while (0)
|
|
/* How much is left to copy to safe buffer after @data? */
|
static int btf_show_obj_size_left(struct btf_show *show, void *data)
|
{
|
return show->obj.head + show->obj.size - data;
|
}
|
|
/* Is object pointed to by @data of @size already copied to our safe buffer? */
|
static bool btf_show_obj_is_safe(struct btf_show *show, void *data, int size)
|
{
|
return data >= show->obj.data &&
|
(data + size) < (show->obj.data + BTF_SHOW_OBJ_SAFE_SIZE);
|
}
|
|
/*
|
* If object pointed to by @data of @size falls within our safe buffer, return
|
* the equivalent pointer to the same safe data. Assumes
|
* copy_from_kernel_nofault() has already happened and our safe buffer is
|
* populated.
|
*/
|
static void *__btf_show_obj_safe(struct btf_show *show, void *data, int size)
|
{
|
if (btf_show_obj_is_safe(show, data, size))
|
return show->obj.safe + (data - show->obj.data);
|
return NULL;
|
}
|
|
/*
|
* Return a safe-to-access version of data pointed to by @data.
|
* We do this by copying the relevant amount of information
|
* to the struct btf_show obj.safe buffer using copy_from_kernel_nofault().
|
*
|
* If BTF_SHOW_UNSAFE is specified, just return data as-is; no
|
* safe copy is needed.
|
*
|
* Otherwise we need to determine if we have the required amount
|
* of data (determined by the @data pointer and the size of the
|
* largest base type we can encounter (represented by
|
* BTF_SHOW_OBJ_BASE_TYPE_SIZE). Having that much data ensures
|
* that we will be able to print some of the current object,
|
* and if more is needed a copy will be triggered.
|
* Some objects such as structs will not fit into the buffer;
|
* in such cases additional copies when we iterate over their
|
* members may be needed.
|
*
|
* btf_show_obj_safe() is used to return a safe buffer for
|
* btf_show_start_type(); this ensures that as we recurse into
|
* nested types we always have safe data for the given type.
|
* This approach is somewhat wasteful; it's possible for example
|
* that when iterating over a large union we'll end up copying the
|
* same data repeatedly, but the goal is safety not performance.
|
* We use stack data as opposed to per-CPU buffers because the
|
* iteration over a type can take some time, and preemption handling
|
* would greatly complicate use of the safe buffer.
|
*/
|
static void *btf_show_obj_safe(struct btf_show *show,
|
const struct btf_type *t,
|
void *data)
|
{
|
const struct btf_type *rt;
|
int size_left, size;
|
void *safe = NULL;
|
|
if (show->flags & BTF_SHOW_UNSAFE)
|
return data;
|
|
rt = btf_resolve_size(show->btf, t, &size);
|
if (IS_ERR(rt)) {
|
show->state.status = PTR_ERR(rt);
|
return NULL;
|
}
|
|
/*
|
* Is this toplevel object? If so, set total object size and
|
* initialize pointers. Otherwise check if we still fall within
|
* our safe object data.
|
*/
|
if (show->state.depth == 0) {
|
show->obj.size = size;
|
show->obj.head = data;
|
} else {
|
/*
|
* If the size of the current object is > our remaining
|
* safe buffer we _may_ need to do a new copy. However
|
* consider the case of a nested struct; it's size pushes
|
* us over the safe buffer limit, but showing any individual
|
* struct members does not. In such cases, we don't need
|
* to initiate a fresh copy yet; however we definitely need
|
* at least BTF_SHOW_OBJ_BASE_TYPE_SIZE bytes left
|
* in our buffer, regardless of the current object size.
|
* The logic here is that as we resolve types we will
|
* hit a base type at some point, and we need to be sure
|
* the next chunk of data is safely available to display
|
* that type info safely. We cannot rely on the size of
|
* the current object here because it may be much larger
|
* than our current buffer (e.g. task_struct is 8k).
|
* All we want to do here is ensure that we can print the
|
* next basic type, which we can if either
|
* - the current type size is within the safe buffer; or
|
* - at least BTF_SHOW_OBJ_BASE_TYPE_SIZE bytes are left in
|
* the safe buffer.
|
*/
|
safe = __btf_show_obj_safe(show, data,
|
min(size,
|
BTF_SHOW_OBJ_BASE_TYPE_SIZE));
|
}
|
|
/*
|
* We need a new copy to our safe object, either because we haven't
|
* yet copied and are intializing safe data, or because the data
|
* we want falls outside the boundaries of the safe object.
|
*/
|
if (!safe) {
|
size_left = btf_show_obj_size_left(show, data);
|
if (size_left > BTF_SHOW_OBJ_SAFE_SIZE)
|
size_left = BTF_SHOW_OBJ_SAFE_SIZE;
|
show->state.status = copy_from_kernel_nofault(show->obj.safe,
|
data, size_left);
|
if (!show->state.status) {
|
show->obj.data = data;
|
safe = show->obj.safe;
|
}
|
}
|
|
return safe;
|
}
|
|
/*
|
* Set the type we are starting to show and return a safe data pointer
|
* to be used for showing the associated data.
|
*/
|
static void *btf_show_start_type(struct btf_show *show,
|
const struct btf_type *t,
|
u32 type_id, void *data)
|
{
|
show->state.type = t;
|
show->state.type_id = type_id;
|
show->state.name[0] = '\0';
|
|
return btf_show_obj_safe(show, t, data);
|
}
|
|
static void btf_show_end_type(struct btf_show *show)
|
{
|
show->state.type = NULL;
|
show->state.type_id = 0;
|
show->state.name[0] = '\0';
|
}
|
|
static void *btf_show_start_aggr_type(struct btf_show *show,
|
const struct btf_type *t,
|
u32 type_id, void *data)
|
{
|
void *safe_data = btf_show_start_type(show, t, type_id, data);
|
|
if (!safe_data)
|
return safe_data;
|
|
btf_show(show, "%s%s%s", btf_show_indent(show),
|
btf_show_name(show),
|
btf_show_newline(show));
|
show->state.depth++;
|
return safe_data;
|
}
|
|
static void btf_show_end_aggr_type(struct btf_show *show,
|
const char *suffix)
|
{
|
show->state.depth--;
|
btf_show(show, "%s%s%s%s", btf_show_indent(show), suffix,
|
btf_show_delim(show), btf_show_newline(show));
|
btf_show_end_type(show);
|
}
|
|
static void btf_show_start_member(struct btf_show *show,
|
const struct btf_member *m)
|
{
|
show->state.member = m;
|
}
|
|
static void btf_show_start_array_member(struct btf_show *show)
|
{
|
show->state.array_member = 1;
|
btf_show_start_member(show, NULL);
|
}
|
|
static void btf_show_end_member(struct btf_show *show)
|
{
|
show->state.member = NULL;
|
}
|
|
static void btf_show_end_array_member(struct btf_show *show)
|
{
|
show->state.array_member = 0;
|
btf_show_end_member(show);
|
}
|
|
static void *btf_show_start_array_type(struct btf_show *show,
|
const struct btf_type *t,
|
u32 type_id,
|
u16 array_encoding,
|
void *data)
|
{
|
show->state.array_encoding = array_encoding;
|
show->state.array_terminated = 0;
|
return btf_show_start_aggr_type(show, t, type_id, data);
|
}
|
|
static void btf_show_end_array_type(struct btf_show *show)
|
{
|
show->state.array_encoding = 0;
|
show->state.array_terminated = 0;
|
btf_show_end_aggr_type(show, "]");
|
}
|
|
static void *btf_show_start_struct_type(struct btf_show *show,
|
const struct btf_type *t,
|
u32 type_id,
|
void *data)
|
{
|
return btf_show_start_aggr_type(show, t, type_id, data);
|
}
|
|
static void btf_show_end_struct_type(struct btf_show *show)
|
{
|
btf_show_end_aggr_type(show, "}");
|
}
|
|
__printf(2, 3) static void __btf_verifier_log(struct bpf_verifier_log *log,
|
const char *fmt, ...)
|
{
|
va_list args;
|
|
va_start(args, fmt);
|
bpf_verifier_vlog(log, fmt, args);
|
va_end(args);
|
}
|
|
__printf(2, 3) static void btf_verifier_log(struct btf_verifier_env *env,
|
const char *fmt, ...)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
va_list args;
|
|
if (!bpf_verifier_log_needed(log))
|
return;
|
|
va_start(args, fmt);
|
bpf_verifier_vlog(log, fmt, args);
|
va_end(args);
|
}
|
|
__printf(4, 5) static void __btf_verifier_log_type(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
bool log_details,
|
const char *fmt, ...)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
u8 kind = BTF_INFO_KIND(t->info);
|
struct btf *btf = env->btf;
|
va_list args;
|
|
if (!bpf_verifier_log_needed(log))
|
return;
|
|
/* btf verifier prints all types it is processing via
|
* btf_verifier_log_type(..., fmt = NULL).
|
* Skip those prints for in-kernel BTF verification.
|
*/
|
if (log->level == BPF_LOG_KERNEL && !fmt)
|
return;
|
|
__btf_verifier_log(log, "[%u] %s %s%s",
|
env->log_type_id,
|
btf_kind_str[kind],
|
__btf_name_by_offset(btf, t->name_off),
|
log_details ? " " : "");
|
|
if (log_details)
|
btf_type_ops(t)->log_details(env, t);
|
|
if (fmt && *fmt) {
|
__btf_verifier_log(log, " ");
|
va_start(args, fmt);
|
bpf_verifier_vlog(log, fmt, args);
|
va_end(args);
|
}
|
|
__btf_verifier_log(log, "\n");
|
}
|
|
#define btf_verifier_log_type(env, t, ...) \
|
__btf_verifier_log_type((env), (t), true, __VA_ARGS__)
|
#define btf_verifier_log_basic(env, t, ...) \
|
__btf_verifier_log_type((env), (t), false, __VA_ARGS__)
|
|
__printf(4, 5)
|
static void btf_verifier_log_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const char *fmt, ...)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
struct btf *btf = env->btf;
|
va_list args;
|
|
if (!bpf_verifier_log_needed(log))
|
return;
|
|
if (log->level == BPF_LOG_KERNEL && !fmt)
|
return;
|
/* The CHECK_META phase already did a btf dump.
|
*
|
* If member is logged again, it must hit an error in
|
* parsing this member. It is useful to print out which
|
* struct this member belongs to.
|
*/
|
if (env->phase != CHECK_META)
|
btf_verifier_log_type(env, struct_type, NULL);
|
|
if (btf_type_kflag(struct_type))
|
__btf_verifier_log(log,
|
"\t%s type_id=%u bitfield_size=%u bits_offset=%u",
|
__btf_name_by_offset(btf, member->name_off),
|
member->type,
|
BTF_MEMBER_BITFIELD_SIZE(member->offset),
|
BTF_MEMBER_BIT_OFFSET(member->offset));
|
else
|
__btf_verifier_log(log, "\t%s type_id=%u bits_offset=%u",
|
__btf_name_by_offset(btf, member->name_off),
|
member->type, member->offset);
|
|
if (fmt && *fmt) {
|
__btf_verifier_log(log, " ");
|
va_start(args, fmt);
|
bpf_verifier_vlog(log, fmt, args);
|
va_end(args);
|
}
|
|
__btf_verifier_log(log, "\n");
|
}
|
|
__printf(4, 5)
|
static void btf_verifier_log_vsi(struct btf_verifier_env *env,
|
const struct btf_type *datasec_type,
|
const struct btf_var_secinfo *vsi,
|
const char *fmt, ...)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
va_list args;
|
|
if (!bpf_verifier_log_needed(log))
|
return;
|
if (log->level == BPF_LOG_KERNEL && !fmt)
|
return;
|
if (env->phase != CHECK_META)
|
btf_verifier_log_type(env, datasec_type, NULL);
|
|
__btf_verifier_log(log, "\t type_id=%u offset=%u size=%u",
|
vsi->type, vsi->offset, vsi->size);
|
if (fmt && *fmt) {
|
__btf_verifier_log(log, " ");
|
va_start(args, fmt);
|
bpf_verifier_vlog(log, fmt, args);
|
va_end(args);
|
}
|
|
__btf_verifier_log(log, "\n");
|
}
|
|
static void btf_verifier_log_hdr(struct btf_verifier_env *env,
|
u32 btf_data_size)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
const struct btf *btf = env->btf;
|
const struct btf_header *hdr;
|
|
if (!bpf_verifier_log_needed(log))
|
return;
|
|
if (log->level == BPF_LOG_KERNEL)
|
return;
|
hdr = &btf->hdr;
|
__btf_verifier_log(log, "magic: 0x%x\n", hdr->magic);
|
__btf_verifier_log(log, "version: %u\n", hdr->version);
|
__btf_verifier_log(log, "flags: 0x%x\n", hdr->flags);
|
__btf_verifier_log(log, "hdr_len: %u\n", hdr->hdr_len);
|
__btf_verifier_log(log, "type_off: %u\n", hdr->type_off);
|
__btf_verifier_log(log, "type_len: %u\n", hdr->type_len);
|
__btf_verifier_log(log, "str_off: %u\n", hdr->str_off);
|
__btf_verifier_log(log, "str_len: %u\n", hdr->str_len);
|
__btf_verifier_log(log, "btf_total_size: %u\n", btf_data_size);
|
}
|
|
static int btf_add_type(struct btf_verifier_env *env, struct btf_type *t)
|
{
|
struct btf *btf = env->btf;
|
|
/* < 2 because +1 for btf_void which is always in btf->types[0].
|
* btf_void is not accounted in btf->nr_types because btf_void
|
* does not come from the BTF file.
|
*/
|
if (btf->types_size - btf->nr_types < 2) {
|
/* Expand 'types' array */
|
|
struct btf_type **new_types;
|
u32 expand_by, new_size;
|
|
if (btf->types_size == BTF_MAX_TYPE) {
|
btf_verifier_log(env, "Exceeded max num of types");
|
return -E2BIG;
|
}
|
|
expand_by = max_t(u32, btf->types_size >> 2, 16);
|
new_size = min_t(u32, BTF_MAX_TYPE,
|
btf->types_size + expand_by);
|
|
new_types = kvcalloc(new_size, sizeof(*new_types),
|
GFP_KERNEL | __GFP_NOWARN);
|
if (!new_types)
|
return -ENOMEM;
|
|
if (btf->nr_types == 0)
|
new_types[0] = &btf_void;
|
else
|
memcpy(new_types, btf->types,
|
sizeof(*btf->types) * (btf->nr_types + 1));
|
|
kvfree(btf->types);
|
btf->types = new_types;
|
btf->types_size = new_size;
|
}
|
|
btf->types[++(btf->nr_types)] = t;
|
|
return 0;
|
}
|
|
static int btf_alloc_id(struct btf *btf)
|
{
|
int id;
|
|
idr_preload(GFP_KERNEL);
|
spin_lock_bh(&btf_idr_lock);
|
id = idr_alloc_cyclic(&btf_idr, btf, 1, INT_MAX, GFP_ATOMIC);
|
if (id > 0)
|
btf->id = id;
|
spin_unlock_bh(&btf_idr_lock);
|
idr_preload_end();
|
|
if (WARN_ON_ONCE(!id))
|
return -ENOSPC;
|
|
return id > 0 ? 0 : id;
|
}
|
|
static void btf_free_id(struct btf *btf)
|
{
|
unsigned long flags;
|
|
/*
|
* In map-in-map, calling map_delete_elem() on outer
|
* map will call bpf_map_put on the inner map.
|
* It will then eventually call btf_free_id()
|
* on the inner map. Some of the map_delete_elem()
|
* implementation may have irq disabled, so
|
* we need to use the _irqsave() version instead
|
* of the _bh() version.
|
*/
|
spin_lock_irqsave(&btf_idr_lock, flags);
|
idr_remove(&btf_idr, btf->id);
|
spin_unlock_irqrestore(&btf_idr_lock, flags);
|
}
|
|
static void btf_free(struct btf *btf)
|
{
|
kvfree(btf->types);
|
kvfree(btf->resolved_sizes);
|
kvfree(btf->resolved_ids);
|
kvfree(btf->data);
|
kfree(btf);
|
}
|
|
static void btf_free_rcu(struct rcu_head *rcu)
|
{
|
struct btf *btf = container_of(rcu, struct btf, rcu);
|
|
btf_free(btf);
|
}
|
|
void btf_put(struct btf *btf)
|
{
|
if (btf && refcount_dec_and_test(&btf->refcnt)) {
|
btf_free_id(btf);
|
call_rcu(&btf->rcu, btf_free_rcu);
|
}
|
}
|
|
static int env_resolve_init(struct btf_verifier_env *env)
|
{
|
struct btf *btf = env->btf;
|
u32 nr_types = btf->nr_types;
|
u32 *resolved_sizes = NULL;
|
u32 *resolved_ids = NULL;
|
u8 *visit_states = NULL;
|
|
/* +1 for btf_void */
|
resolved_sizes = kvcalloc(nr_types + 1, sizeof(*resolved_sizes),
|
GFP_KERNEL | __GFP_NOWARN);
|
if (!resolved_sizes)
|
goto nomem;
|
|
resolved_ids = kvcalloc(nr_types + 1, sizeof(*resolved_ids),
|
GFP_KERNEL | __GFP_NOWARN);
|
if (!resolved_ids)
|
goto nomem;
|
|
visit_states = kvcalloc(nr_types + 1, sizeof(*visit_states),
|
GFP_KERNEL | __GFP_NOWARN);
|
if (!visit_states)
|
goto nomem;
|
|
btf->resolved_sizes = resolved_sizes;
|
btf->resolved_ids = resolved_ids;
|
env->visit_states = visit_states;
|
|
return 0;
|
|
nomem:
|
kvfree(resolved_sizes);
|
kvfree(resolved_ids);
|
kvfree(visit_states);
|
return -ENOMEM;
|
}
|
|
static void btf_verifier_env_free(struct btf_verifier_env *env)
|
{
|
kvfree(env->visit_states);
|
kfree(env);
|
}
|
|
static bool env_type_is_resolve_sink(const struct btf_verifier_env *env,
|
const struct btf_type *next_type)
|
{
|
switch (env->resolve_mode) {
|
case RESOLVE_TBD:
|
/* int, enum or void is a sink */
|
return !btf_type_needs_resolve(next_type);
|
case RESOLVE_PTR:
|
/* int, enum, void, struct, array, func or func_proto is a sink
|
* for ptr
|
*/
|
return !btf_type_is_modifier(next_type) &&
|
!btf_type_is_ptr(next_type);
|
case RESOLVE_STRUCT_OR_ARRAY:
|
/* int, enum, void, ptr, func or func_proto is a sink
|
* for struct and array
|
*/
|
return !btf_type_is_modifier(next_type) &&
|
!btf_type_is_array(next_type) &&
|
!btf_type_is_struct(next_type);
|
default:
|
BUG();
|
}
|
}
|
|
static bool env_type_is_resolved(const struct btf_verifier_env *env,
|
u32 type_id)
|
{
|
return env->visit_states[type_id] == RESOLVED;
|
}
|
|
static int env_stack_push(struct btf_verifier_env *env,
|
const struct btf_type *t, u32 type_id)
|
{
|
struct resolve_vertex *v;
|
|
if (env->top_stack == MAX_RESOLVE_DEPTH)
|
return -E2BIG;
|
|
if (env->visit_states[type_id] != NOT_VISITED)
|
return -EEXIST;
|
|
env->visit_states[type_id] = VISITED;
|
|
v = &env->stack[env->top_stack++];
|
v->t = t;
|
v->type_id = type_id;
|
v->next_member = 0;
|
|
if (env->resolve_mode == RESOLVE_TBD) {
|
if (btf_type_is_ptr(t))
|
env->resolve_mode = RESOLVE_PTR;
|
else if (btf_type_is_struct(t) || btf_type_is_array(t))
|
env->resolve_mode = RESOLVE_STRUCT_OR_ARRAY;
|
}
|
|
return 0;
|
}
|
|
static void env_stack_set_next_member(struct btf_verifier_env *env,
|
u16 next_member)
|
{
|
env->stack[env->top_stack - 1].next_member = next_member;
|
}
|
|
static void env_stack_pop_resolved(struct btf_verifier_env *env,
|
u32 resolved_type_id,
|
u32 resolved_size)
|
{
|
u32 type_id = env->stack[--(env->top_stack)].type_id;
|
struct btf *btf = env->btf;
|
|
btf->resolved_sizes[type_id] = resolved_size;
|
btf->resolved_ids[type_id] = resolved_type_id;
|
env->visit_states[type_id] = RESOLVED;
|
}
|
|
static const struct resolve_vertex *env_stack_peak(struct btf_verifier_env *env)
|
{
|
return env->top_stack ? &env->stack[env->top_stack - 1] : NULL;
|
}
|
|
/* Resolve the size of a passed-in "type"
|
*
|
* type: is an array (e.g. u32 array[x][y])
|
* return type: type "u32[x][y]", i.e. BTF_KIND_ARRAY,
|
* *type_size: (x * y * sizeof(u32)). Hence, *type_size always
|
* corresponds to the return type.
|
* *elem_type: u32
|
* *elem_id: id of u32
|
* *total_nelems: (x * y). Hence, individual elem size is
|
* (*type_size / *total_nelems)
|
* *type_id: id of type if it's changed within the function, 0 if not
|
*
|
* type: is not an array (e.g. const struct X)
|
* return type: type "struct X"
|
* *type_size: sizeof(struct X)
|
* *elem_type: same as return type ("struct X")
|
* *elem_id: 0
|
* *total_nelems: 1
|
* *type_id: id of type if it's changed within the function, 0 if not
|
*/
|
static const struct btf_type *
|
__btf_resolve_size(const struct btf *btf, const struct btf_type *type,
|
u32 *type_size, const struct btf_type **elem_type,
|
u32 *elem_id, u32 *total_nelems, u32 *type_id)
|
{
|
const struct btf_type *array_type = NULL;
|
const struct btf_array *array = NULL;
|
u32 i, size, nelems = 1, id = 0;
|
|
for (i = 0; i < MAX_RESOLVE_DEPTH; i++) {
|
switch (BTF_INFO_KIND(type->info)) {
|
/* type->size can be used */
|
case BTF_KIND_INT:
|
case BTF_KIND_STRUCT:
|
case BTF_KIND_UNION:
|
case BTF_KIND_ENUM:
|
size = type->size;
|
goto resolved;
|
|
case BTF_KIND_PTR:
|
size = sizeof(void *);
|
goto resolved;
|
|
/* Modifiers */
|
case BTF_KIND_TYPEDEF:
|
case BTF_KIND_VOLATILE:
|
case BTF_KIND_CONST:
|
case BTF_KIND_RESTRICT:
|
id = type->type;
|
type = btf_type_by_id(btf, type->type);
|
break;
|
|
case BTF_KIND_ARRAY:
|
if (!array_type)
|
array_type = type;
|
array = btf_type_array(type);
|
if (nelems && array->nelems > U32_MAX / nelems)
|
return ERR_PTR(-EINVAL);
|
nelems *= array->nelems;
|
type = btf_type_by_id(btf, array->type);
|
break;
|
|
/* type without size */
|
default:
|
return ERR_PTR(-EINVAL);
|
}
|
}
|
|
return ERR_PTR(-EINVAL);
|
|
resolved:
|
if (nelems && size > U32_MAX / nelems)
|
return ERR_PTR(-EINVAL);
|
|
*type_size = nelems * size;
|
if (total_nelems)
|
*total_nelems = nelems;
|
if (elem_type)
|
*elem_type = type;
|
if (elem_id)
|
*elem_id = array ? array->type : 0;
|
if (type_id && id)
|
*type_id = id;
|
|
return array_type ? : type;
|
}
|
|
const struct btf_type *
|
btf_resolve_size(const struct btf *btf, const struct btf_type *type,
|
u32 *type_size)
|
{
|
return __btf_resolve_size(btf, type, type_size, NULL, NULL, NULL, NULL);
|
}
|
|
/* The input param "type_id" must point to a needs_resolve type */
|
static const struct btf_type *btf_type_id_resolve(const struct btf *btf,
|
u32 *type_id)
|
{
|
*type_id = btf->resolved_ids[*type_id];
|
return btf_type_by_id(btf, *type_id);
|
}
|
|
const struct btf_type *btf_type_id_size(const struct btf *btf,
|
u32 *type_id, u32 *ret_size)
|
{
|
const struct btf_type *size_type;
|
u32 size_type_id = *type_id;
|
u32 size = 0;
|
|
size_type = btf_type_by_id(btf, size_type_id);
|
if (btf_type_nosize_or_null(size_type))
|
return NULL;
|
|
if (btf_type_has_size(size_type)) {
|
size = size_type->size;
|
} else if (btf_type_is_array(size_type)) {
|
size = btf->resolved_sizes[size_type_id];
|
} else if (btf_type_is_ptr(size_type)) {
|
size = sizeof(void *);
|
} else {
|
if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) &&
|
!btf_type_is_var(size_type)))
|
return NULL;
|
|
size_type_id = btf->resolved_ids[size_type_id];
|
size_type = btf_type_by_id(btf, size_type_id);
|
if (btf_type_nosize_or_null(size_type))
|
return NULL;
|
else if (btf_type_has_size(size_type))
|
size = size_type->size;
|
else if (btf_type_is_array(size_type))
|
size = btf->resolved_sizes[size_type_id];
|
else if (btf_type_is_ptr(size_type))
|
size = sizeof(void *);
|
else
|
return NULL;
|
}
|
|
*type_id = size_type_id;
|
if (ret_size)
|
*ret_size = size;
|
|
return size_type;
|
}
|
|
static int btf_df_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
btf_verifier_log_basic(env, struct_type,
|
"Unsupported check_member");
|
return -EINVAL;
|
}
|
|
static int btf_df_check_kflag_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
btf_verifier_log_basic(env, struct_type,
|
"Unsupported check_kflag_member");
|
return -EINVAL;
|
}
|
|
/* Used for ptr, array and struct/union type members.
|
* int, enum and modifier types have their specific callback functions.
|
*/
|
static int btf_generic_check_kflag_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
if (BTF_MEMBER_BITFIELD_SIZE(member->offset)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member bitfield_size");
|
return -EINVAL;
|
}
|
|
/* bitfield size is 0, so member->offset represents bit offset only.
|
* It is safe to call non kflag check_member variants.
|
*/
|
return btf_type_ops(member_type)->check_member(env, struct_type,
|
member,
|
member_type);
|
}
|
|
static int btf_df_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
btf_verifier_log_basic(env, v->t, "Unsupported resolve");
|
return -EINVAL;
|
}
|
|
static void btf_df_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offsets,
|
struct btf_show *show)
|
{
|
btf_show(show, "<unsupported kind:%u>", BTF_INFO_KIND(t->info));
|
}
|
|
static int btf_int_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 int_data = btf_type_int(member_type);
|
u32 struct_bits_off = member->offset;
|
u32 struct_size = struct_type->size;
|
u32 nr_copy_bits;
|
u32 bytes_offset;
|
|
if (U32_MAX - struct_bits_off < BTF_INT_OFFSET(int_data)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"bits_offset exceeds U32_MAX");
|
return -EINVAL;
|
}
|
|
struct_bits_off += BTF_INT_OFFSET(int_data);
|
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
|
nr_copy_bits = BTF_INT_BITS(int_data) +
|
BITS_PER_BYTE_MASKED(struct_bits_off);
|
|
if (nr_copy_bits > BITS_PER_U128) {
|
btf_verifier_log_member(env, struct_type, member,
|
"nr_copy_bits exceeds 128");
|
return -EINVAL;
|
}
|
|
if (struct_size < bytes_offset ||
|
struct_size - bytes_offset < BITS_ROUNDUP_BYTES(nr_copy_bits)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static int btf_int_check_kflag_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 struct_bits_off, nr_bits, nr_int_data_bits, bytes_offset;
|
u32 int_data = btf_type_int(member_type);
|
u32 struct_size = struct_type->size;
|
u32 nr_copy_bits;
|
|
/* a regular int type is required for the kflag int member */
|
if (!btf_type_int_is_regular(member_type)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member base type");
|
return -EINVAL;
|
}
|
|
/* check sanity of bitfield size */
|
nr_bits = BTF_MEMBER_BITFIELD_SIZE(member->offset);
|
struct_bits_off = BTF_MEMBER_BIT_OFFSET(member->offset);
|
nr_int_data_bits = BTF_INT_BITS(int_data);
|
if (!nr_bits) {
|
/* Not a bitfield member, member offset must be at byte
|
* boundary.
|
*/
|
if (BITS_PER_BYTE_MASKED(struct_bits_off)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member offset");
|
return -EINVAL;
|
}
|
|
nr_bits = nr_int_data_bits;
|
} else if (nr_bits > nr_int_data_bits) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member bitfield_size");
|
return -EINVAL;
|
}
|
|
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
|
nr_copy_bits = nr_bits + BITS_PER_BYTE_MASKED(struct_bits_off);
|
if (nr_copy_bits > BITS_PER_U128) {
|
btf_verifier_log_member(env, struct_type, member,
|
"nr_copy_bits exceeds 128");
|
return -EINVAL;
|
}
|
|
if (struct_size < bytes_offset ||
|
struct_size - bytes_offset < BITS_ROUNDUP_BYTES(nr_copy_bits)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static s32 btf_int_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
u32 int_data, nr_bits, meta_needed = sizeof(int_data);
|
u16 encoding;
|
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
if (btf_type_vlen(t)) {
|
btf_verifier_log_type(env, t, "vlen != 0");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
int_data = btf_type_int(t);
|
if (int_data & ~BTF_INT_MASK) {
|
btf_verifier_log_basic(env, t, "Invalid int_data:%x",
|
int_data);
|
return -EINVAL;
|
}
|
|
nr_bits = BTF_INT_BITS(int_data) + BTF_INT_OFFSET(int_data);
|
|
if (nr_bits > BITS_PER_U128) {
|
btf_verifier_log_type(env, t, "nr_bits exceeds %zu",
|
BITS_PER_U128);
|
return -EINVAL;
|
}
|
|
if (BITS_ROUNDUP_BYTES(nr_bits) > t->size) {
|
btf_verifier_log_type(env, t, "nr_bits exceeds type_size");
|
return -EINVAL;
|
}
|
|
/*
|
* Only one of the encoding bits is allowed and it
|
* should be sufficient for the pretty print purpose (i.e. decoding).
|
* Multiple bits can be allowed later if it is found
|
* to be insufficient.
|
*/
|
encoding = BTF_INT_ENCODING(int_data);
|
if (encoding &&
|
encoding != BTF_INT_SIGNED &&
|
encoding != BTF_INT_CHAR &&
|
encoding != BTF_INT_BOOL) {
|
btf_verifier_log_type(env, t, "Unsupported encoding");
|
return -ENOTSUPP;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return meta_needed;
|
}
|
|
static void btf_int_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
int int_data = btf_type_int(t);
|
|
btf_verifier_log(env,
|
"size=%u bits_offset=%u nr_bits=%u encoding=%s",
|
t->size, BTF_INT_OFFSET(int_data),
|
BTF_INT_BITS(int_data),
|
btf_int_encoding_str(BTF_INT_ENCODING(int_data)));
|
}
|
|
static void btf_int128_print(struct btf_show *show, void *data)
|
{
|
/* data points to a __int128 number.
|
* Suppose
|
* int128_num = *(__int128 *)data;
|
* The below formulas shows what upper_num and lower_num represents:
|
* upper_num = int128_num >> 64;
|
* lower_num = int128_num & 0xffffffffFFFFFFFFULL;
|
*/
|
u64 upper_num, lower_num;
|
|
#ifdef __BIG_ENDIAN_BITFIELD
|
upper_num = *(u64 *)data;
|
lower_num = *(u64 *)(data + 8);
|
#else
|
upper_num = *(u64 *)(data + 8);
|
lower_num = *(u64 *)data;
|
#endif
|
if (upper_num == 0)
|
btf_show_type_value(show, "0x%llx", lower_num);
|
else
|
btf_show_type_values(show, "0x%llx%016llx", upper_num,
|
lower_num);
|
}
|
|
static void btf_int128_shift(u64 *print_num, u16 left_shift_bits,
|
u16 right_shift_bits)
|
{
|
u64 upper_num, lower_num;
|
|
#ifdef __BIG_ENDIAN_BITFIELD
|
upper_num = print_num[0];
|
lower_num = print_num[1];
|
#else
|
upper_num = print_num[1];
|
lower_num = print_num[0];
|
#endif
|
|
/* shake out un-needed bits by shift/or operations */
|
if (left_shift_bits >= 64) {
|
upper_num = lower_num << (left_shift_bits - 64);
|
lower_num = 0;
|
} else {
|
upper_num = (upper_num << left_shift_bits) |
|
(lower_num >> (64 - left_shift_bits));
|
lower_num = lower_num << left_shift_bits;
|
}
|
|
if (right_shift_bits >= 64) {
|
lower_num = upper_num >> (right_shift_bits - 64);
|
upper_num = 0;
|
} else {
|
lower_num = (lower_num >> right_shift_bits) |
|
(upper_num << (64 - right_shift_bits));
|
upper_num = upper_num >> right_shift_bits;
|
}
|
|
#ifdef __BIG_ENDIAN_BITFIELD
|
print_num[0] = upper_num;
|
print_num[1] = lower_num;
|
#else
|
print_num[0] = lower_num;
|
print_num[1] = upper_num;
|
#endif
|
}
|
|
static void btf_bitfield_show(void *data, u8 bits_offset,
|
u8 nr_bits, struct btf_show *show)
|
{
|
u16 left_shift_bits, right_shift_bits;
|
u8 nr_copy_bytes;
|
u8 nr_copy_bits;
|
u64 print_num[2] = {};
|
|
nr_copy_bits = nr_bits + bits_offset;
|
nr_copy_bytes = BITS_ROUNDUP_BYTES(nr_copy_bits);
|
|
memcpy(print_num, data, nr_copy_bytes);
|
|
#ifdef __BIG_ENDIAN_BITFIELD
|
left_shift_bits = bits_offset;
|
#else
|
left_shift_bits = BITS_PER_U128 - nr_copy_bits;
|
#endif
|
right_shift_bits = BITS_PER_U128 - nr_bits;
|
|
btf_int128_shift(print_num, left_shift_bits, right_shift_bits);
|
btf_int128_print(show, print_num);
|
}
|
|
|
static void btf_int_bits_show(const struct btf *btf,
|
const struct btf_type *t,
|
void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
u32 int_data = btf_type_int(t);
|
u8 nr_bits = BTF_INT_BITS(int_data);
|
u8 total_bits_offset;
|
|
/*
|
* bits_offset is at most 7.
|
* BTF_INT_OFFSET() cannot exceed 128 bits.
|
*/
|
total_bits_offset = bits_offset + BTF_INT_OFFSET(int_data);
|
data += BITS_ROUNDDOWN_BYTES(total_bits_offset);
|
bits_offset = BITS_PER_BYTE_MASKED(total_bits_offset);
|
btf_bitfield_show(data, bits_offset, nr_bits, show);
|
}
|
|
static void btf_int_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
u32 int_data = btf_type_int(t);
|
u8 encoding = BTF_INT_ENCODING(int_data);
|
bool sign = encoding & BTF_INT_SIGNED;
|
u8 nr_bits = BTF_INT_BITS(int_data);
|
void *safe_data;
|
|
safe_data = btf_show_start_type(show, t, type_id, data);
|
if (!safe_data)
|
return;
|
|
if (bits_offset || BTF_INT_OFFSET(int_data) ||
|
BITS_PER_BYTE_MASKED(nr_bits)) {
|
btf_int_bits_show(btf, t, safe_data, bits_offset, show);
|
goto out;
|
}
|
|
switch (nr_bits) {
|
case 128:
|
btf_int128_print(show, safe_data);
|
break;
|
case 64:
|
if (sign)
|
btf_show_type_value(show, "%lld", *(s64 *)safe_data);
|
else
|
btf_show_type_value(show, "%llu", *(u64 *)safe_data);
|
break;
|
case 32:
|
if (sign)
|
btf_show_type_value(show, "%d", *(s32 *)safe_data);
|
else
|
btf_show_type_value(show, "%u", *(u32 *)safe_data);
|
break;
|
case 16:
|
if (sign)
|
btf_show_type_value(show, "%d", *(s16 *)safe_data);
|
else
|
btf_show_type_value(show, "%u", *(u16 *)safe_data);
|
break;
|
case 8:
|
if (show->state.array_encoding == BTF_INT_CHAR) {
|
/* check for null terminator */
|
if (show->state.array_terminated)
|
break;
|
if (*(char *)data == '\0') {
|
show->state.array_terminated = 1;
|
break;
|
}
|
if (isprint(*(char *)data)) {
|
btf_show_type_value(show, "'%c'",
|
*(char *)safe_data);
|
break;
|
}
|
}
|
if (sign)
|
btf_show_type_value(show, "%d", *(s8 *)safe_data);
|
else
|
btf_show_type_value(show, "%u", *(u8 *)safe_data);
|
break;
|
default:
|
btf_int_bits_show(btf, t, safe_data, bits_offset, show);
|
break;
|
}
|
out:
|
btf_show_end_type(show);
|
}
|
|
static const struct btf_kind_operations int_ops = {
|
.check_meta = btf_int_check_meta,
|
.resolve = btf_df_resolve,
|
.check_member = btf_int_check_member,
|
.check_kflag_member = btf_int_check_kflag_member,
|
.log_details = btf_int_log,
|
.show = btf_int_show,
|
};
|
|
static int btf_modifier_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
const struct btf_type *resolved_type;
|
u32 resolved_type_id = member->type;
|
struct btf_member resolved_member;
|
struct btf *btf = env->btf;
|
|
resolved_type = btf_type_id_size(btf, &resolved_type_id, NULL);
|
if (!resolved_type) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member");
|
return -EINVAL;
|
}
|
|
resolved_member = *member;
|
resolved_member.type = resolved_type_id;
|
|
return btf_type_ops(resolved_type)->check_member(env, struct_type,
|
&resolved_member,
|
resolved_type);
|
}
|
|
static int btf_modifier_check_kflag_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
const struct btf_type *resolved_type;
|
u32 resolved_type_id = member->type;
|
struct btf_member resolved_member;
|
struct btf *btf = env->btf;
|
|
resolved_type = btf_type_id_size(btf, &resolved_type_id, NULL);
|
if (!resolved_type) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member");
|
return -EINVAL;
|
}
|
|
resolved_member = *member;
|
resolved_member.type = resolved_type_id;
|
|
return btf_type_ops(resolved_type)->check_kflag_member(env, struct_type,
|
&resolved_member,
|
resolved_type);
|
}
|
|
static int btf_ptr_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 struct_size, struct_bits_off, bytes_offset;
|
|
struct_size = struct_type->size;
|
struct_bits_off = member->offset;
|
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
|
|
if (BITS_PER_BYTE_MASKED(struct_bits_off)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member is not byte aligned");
|
return -EINVAL;
|
}
|
|
if (struct_size - bytes_offset < sizeof(void *)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static int btf_ref_type_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
if (btf_type_vlen(t)) {
|
btf_verifier_log_type(env, t, "vlen != 0");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
if (!BTF_TYPE_ID_VALID(t->type)) {
|
btf_verifier_log_type(env, t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
/* typedef type must have a valid name, and other ref types,
|
* volatile, const, restrict, should have a null name.
|
*/
|
if (BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF) {
|
if (!t->name_off ||
|
!btf_name_valid_identifier(env->btf, t->name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
} else {
|
if (t->name_off) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return 0;
|
}
|
|
static int btf_modifier_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
const struct btf_type *t = v->t;
|
const struct btf_type *next_type;
|
u32 next_type_id = t->type;
|
struct btf *btf = env->btf;
|
|
next_type = btf_type_by_id(btf, next_type_id);
|
if (!next_type || btf_type_is_resolve_source_only(next_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, next_type) &&
|
!env_type_is_resolved(env, next_type_id))
|
return env_stack_push(env, next_type, next_type_id);
|
|
/* Figure out the resolved next_type_id with size.
|
* They will be stored in the current modifier's
|
* resolved_ids and resolved_sizes such that it can
|
* save us a few type-following when we use it later (e.g. in
|
* pretty print).
|
*/
|
if (!btf_type_id_size(btf, &next_type_id, NULL)) {
|
if (env_type_is_resolved(env, next_type_id))
|
next_type = btf_type_id_resolve(btf, &next_type_id);
|
|
/* "typedef void new_void", "const void"...etc */
|
if (!btf_type_is_void(next_type) &&
|
!btf_type_is_fwd(next_type) &&
|
!btf_type_is_func_proto(next_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid type_id");
|
return -EINVAL;
|
}
|
}
|
|
env_stack_pop_resolved(env, next_type_id, 0);
|
|
return 0;
|
}
|
|
static int btf_var_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
const struct btf_type *next_type;
|
const struct btf_type *t = v->t;
|
u32 next_type_id = t->type;
|
struct btf *btf = env->btf;
|
|
next_type = btf_type_by_id(btf, next_type_id);
|
if (!next_type || btf_type_is_resolve_source_only(next_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, next_type) &&
|
!env_type_is_resolved(env, next_type_id))
|
return env_stack_push(env, next_type, next_type_id);
|
|
if (btf_type_is_modifier(next_type)) {
|
const struct btf_type *resolved_type;
|
u32 resolved_type_id;
|
|
resolved_type_id = next_type_id;
|
resolved_type = btf_type_id_resolve(btf, &resolved_type_id);
|
|
if (btf_type_is_ptr(resolved_type) &&
|
!env_type_is_resolve_sink(env, resolved_type) &&
|
!env_type_is_resolved(env, resolved_type_id))
|
return env_stack_push(env, resolved_type,
|
resolved_type_id);
|
}
|
|
/* We must resolve to something concrete at this point, no
|
* forward types or similar that would resolve to size of
|
* zero is allowed.
|
*/
|
if (!btf_type_id_size(btf, &next_type_id, NULL)) {
|
btf_verifier_log_type(env, v->t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
env_stack_pop_resolved(env, next_type_id, 0);
|
|
return 0;
|
}
|
|
static int btf_ptr_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
const struct btf_type *next_type;
|
const struct btf_type *t = v->t;
|
u32 next_type_id = t->type;
|
struct btf *btf = env->btf;
|
|
next_type = btf_type_by_id(btf, next_type_id);
|
if (!next_type || btf_type_is_resolve_source_only(next_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, next_type) &&
|
!env_type_is_resolved(env, next_type_id))
|
return env_stack_push(env, next_type, next_type_id);
|
|
/* If the modifier was RESOLVED during RESOLVE_STRUCT_OR_ARRAY,
|
* the modifier may have stopped resolving when it was resolved
|
* to a ptr (last-resolved-ptr).
|
*
|
* We now need to continue from the last-resolved-ptr to
|
* ensure the last-resolved-ptr will not referring back to
|
* the currenct ptr (t).
|
*/
|
if (btf_type_is_modifier(next_type)) {
|
const struct btf_type *resolved_type;
|
u32 resolved_type_id;
|
|
resolved_type_id = next_type_id;
|
resolved_type = btf_type_id_resolve(btf, &resolved_type_id);
|
|
if (btf_type_is_ptr(resolved_type) &&
|
!env_type_is_resolve_sink(env, resolved_type) &&
|
!env_type_is_resolved(env, resolved_type_id))
|
return env_stack_push(env, resolved_type,
|
resolved_type_id);
|
}
|
|
if (!btf_type_id_size(btf, &next_type_id, NULL)) {
|
if (env_type_is_resolved(env, next_type_id))
|
next_type = btf_type_id_resolve(btf, &next_type_id);
|
|
if (!btf_type_is_void(next_type) &&
|
!btf_type_is_fwd(next_type) &&
|
!btf_type_is_func_proto(next_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid type_id");
|
return -EINVAL;
|
}
|
}
|
|
env_stack_pop_resolved(env, next_type_id, 0);
|
|
return 0;
|
}
|
|
static void btf_modifier_show(const struct btf *btf,
|
const struct btf_type *t,
|
u32 type_id, void *data,
|
u8 bits_offset, struct btf_show *show)
|
{
|
if (btf->resolved_ids)
|
t = btf_type_id_resolve(btf, &type_id);
|
else
|
t = btf_type_skip_modifiers(btf, type_id, NULL);
|
|
btf_type_ops(t)->show(btf, t, type_id, data, bits_offset, show);
|
}
|
|
static void btf_var_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
t = btf_type_id_resolve(btf, &type_id);
|
|
btf_type_ops(t)->show(btf, t, type_id, data, bits_offset, show);
|
}
|
|
static void btf_ptr_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
void *safe_data;
|
|
safe_data = btf_show_start_type(show, t, type_id, data);
|
if (!safe_data)
|
return;
|
|
/* It is a hashed value unless BTF_SHOW_PTR_RAW is specified */
|
if (show->flags & BTF_SHOW_PTR_RAW)
|
btf_show_type_value(show, "0x%px", *(void **)safe_data);
|
else
|
btf_show_type_value(show, "0x%p", *(void **)safe_data);
|
btf_show_end_type(show);
|
}
|
|
static void btf_ref_type_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
btf_verifier_log(env, "type_id=%u", t->type);
|
}
|
|
static struct btf_kind_operations modifier_ops = {
|
.check_meta = btf_ref_type_check_meta,
|
.resolve = btf_modifier_resolve,
|
.check_member = btf_modifier_check_member,
|
.check_kflag_member = btf_modifier_check_kflag_member,
|
.log_details = btf_ref_type_log,
|
.show = btf_modifier_show,
|
};
|
|
static struct btf_kind_operations ptr_ops = {
|
.check_meta = btf_ref_type_check_meta,
|
.resolve = btf_ptr_resolve,
|
.check_member = btf_ptr_check_member,
|
.check_kflag_member = btf_generic_check_kflag_member,
|
.log_details = btf_ref_type_log,
|
.show = btf_ptr_show,
|
};
|
|
static s32 btf_fwd_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
if (btf_type_vlen(t)) {
|
btf_verifier_log_type(env, t, "vlen != 0");
|
return -EINVAL;
|
}
|
|
if (t->type) {
|
btf_verifier_log_type(env, t, "type != 0");
|
return -EINVAL;
|
}
|
|
/* fwd type must have a valid name */
|
if (!t->name_off ||
|
!btf_name_valid_identifier(env->btf, t->name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return 0;
|
}
|
|
static void btf_fwd_type_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
btf_verifier_log(env, "%s", btf_type_kflag(t) ? "union" : "struct");
|
}
|
|
static struct btf_kind_operations fwd_ops = {
|
.check_meta = btf_fwd_check_meta,
|
.resolve = btf_df_resolve,
|
.check_member = btf_df_check_member,
|
.check_kflag_member = btf_df_check_kflag_member,
|
.log_details = btf_fwd_type_log,
|
.show = btf_df_show,
|
};
|
|
static int btf_array_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 struct_bits_off = member->offset;
|
u32 struct_size, bytes_offset;
|
u32 array_type_id, array_size;
|
struct btf *btf = env->btf;
|
|
if (BITS_PER_BYTE_MASKED(struct_bits_off)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member is not byte aligned");
|
return -EINVAL;
|
}
|
|
array_type_id = member->type;
|
btf_type_id_size(btf, &array_type_id, &array_size);
|
struct_size = struct_type->size;
|
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
|
if (struct_size - bytes_offset < array_size) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static s32 btf_array_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
const struct btf_array *array = btf_type_array(t);
|
u32 meta_needed = sizeof(*array);
|
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
/* array type should not have a name */
|
if (t->name_off) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
if (btf_type_vlen(t)) {
|
btf_verifier_log_type(env, t, "vlen != 0");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
if (t->size) {
|
btf_verifier_log_type(env, t, "size != 0");
|
return -EINVAL;
|
}
|
|
/* Array elem type and index type cannot be in type void,
|
* so !array->type and !array->index_type are not allowed.
|
*/
|
if (!array->type || !BTF_TYPE_ID_VALID(array->type)) {
|
btf_verifier_log_type(env, t, "Invalid elem");
|
return -EINVAL;
|
}
|
|
if (!array->index_type || !BTF_TYPE_ID_VALID(array->index_type)) {
|
btf_verifier_log_type(env, t, "Invalid index");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return meta_needed;
|
}
|
|
static int btf_array_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
const struct btf_array *array = btf_type_array(v->t);
|
const struct btf_type *elem_type, *index_type;
|
u32 elem_type_id, index_type_id;
|
struct btf *btf = env->btf;
|
u32 elem_size;
|
|
/* Check array->index_type */
|
index_type_id = array->index_type;
|
index_type = btf_type_by_id(btf, index_type_id);
|
if (btf_type_nosize_or_null(index_type) ||
|
btf_type_is_resolve_source_only(index_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid index");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, index_type) &&
|
!env_type_is_resolved(env, index_type_id))
|
return env_stack_push(env, index_type, index_type_id);
|
|
index_type = btf_type_id_size(btf, &index_type_id, NULL);
|
if (!index_type || !btf_type_is_int(index_type) ||
|
!btf_type_int_is_regular(index_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid index");
|
return -EINVAL;
|
}
|
|
/* Check array->type */
|
elem_type_id = array->type;
|
elem_type = btf_type_by_id(btf, elem_type_id);
|
if (btf_type_nosize_or_null(elem_type) ||
|
btf_type_is_resolve_source_only(elem_type)) {
|
btf_verifier_log_type(env, v->t,
|
"Invalid elem");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, elem_type) &&
|
!env_type_is_resolved(env, elem_type_id))
|
return env_stack_push(env, elem_type, elem_type_id);
|
|
elem_type = btf_type_id_size(btf, &elem_type_id, &elem_size);
|
if (!elem_type) {
|
btf_verifier_log_type(env, v->t, "Invalid elem");
|
return -EINVAL;
|
}
|
|
if (btf_type_is_int(elem_type) && !btf_type_int_is_regular(elem_type)) {
|
btf_verifier_log_type(env, v->t, "Invalid array of int");
|
return -EINVAL;
|
}
|
|
if (array->nelems && elem_size > U32_MAX / array->nelems) {
|
btf_verifier_log_type(env, v->t,
|
"Array size overflows U32_MAX");
|
return -EINVAL;
|
}
|
|
env_stack_pop_resolved(env, elem_type_id, elem_size * array->nelems);
|
|
return 0;
|
}
|
|
static void btf_array_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
const struct btf_array *array = btf_type_array(t);
|
|
btf_verifier_log(env, "type_id=%u index_type_id=%u nr_elems=%u",
|
array->type, array->index_type, array->nelems);
|
}
|
|
static void __btf_array_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
const struct btf_array *array = btf_type_array(t);
|
const struct btf_kind_operations *elem_ops;
|
const struct btf_type *elem_type;
|
u32 i, elem_size = 0, elem_type_id;
|
u16 encoding = 0;
|
|
elem_type_id = array->type;
|
elem_type = btf_type_skip_modifiers(btf, elem_type_id, NULL);
|
if (elem_type && btf_type_has_size(elem_type))
|
elem_size = elem_type->size;
|
|
if (elem_type && btf_type_is_int(elem_type)) {
|
u32 int_type = btf_type_int(elem_type);
|
|
encoding = BTF_INT_ENCODING(int_type);
|
|
/*
|
* BTF_INT_CHAR encoding never seems to be set for
|
* char arrays, so if size is 1 and element is
|
* printable as a char, we'll do that.
|
*/
|
if (elem_size == 1)
|
encoding = BTF_INT_CHAR;
|
}
|
|
if (!btf_show_start_array_type(show, t, type_id, encoding, data))
|
return;
|
|
if (!elem_type)
|
goto out;
|
elem_ops = btf_type_ops(elem_type);
|
|
for (i = 0; i < array->nelems; i++) {
|
|
btf_show_start_array_member(show);
|
|
elem_ops->show(btf, elem_type, elem_type_id, data,
|
bits_offset, show);
|
data += elem_size;
|
|
btf_show_end_array_member(show);
|
|
if (show->state.array_terminated)
|
break;
|
}
|
out:
|
btf_show_end_array_type(show);
|
}
|
|
static void btf_array_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
const struct btf_member *m = show->state.member;
|
|
/*
|
* First check if any members would be shown (are non-zero).
|
* See comments above "struct btf_show" definition for more
|
* details on how this works at a high-level.
|
*/
|
if (show->state.depth > 0 && !(show->flags & BTF_SHOW_ZERO)) {
|
if (!show->state.depth_check) {
|
show->state.depth_check = show->state.depth + 1;
|
show->state.depth_to_show = 0;
|
}
|
__btf_array_show(btf, t, type_id, data, bits_offset, show);
|
show->state.member = m;
|
|
if (show->state.depth_check != show->state.depth + 1)
|
return;
|
show->state.depth_check = 0;
|
|
if (show->state.depth_to_show <= show->state.depth)
|
return;
|
/*
|
* Reaching here indicates we have recursed and found
|
* non-zero array member(s).
|
*/
|
}
|
__btf_array_show(btf, t, type_id, data, bits_offset, show);
|
}
|
|
static struct btf_kind_operations array_ops = {
|
.check_meta = btf_array_check_meta,
|
.resolve = btf_array_resolve,
|
.check_member = btf_array_check_member,
|
.check_kflag_member = btf_generic_check_kflag_member,
|
.log_details = btf_array_log,
|
.show = btf_array_show,
|
};
|
|
static int btf_struct_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 struct_bits_off = member->offset;
|
u32 struct_size, bytes_offset;
|
|
if (BITS_PER_BYTE_MASKED(struct_bits_off)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member is not byte aligned");
|
return -EINVAL;
|
}
|
|
struct_size = struct_type->size;
|
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
|
if (struct_size - bytes_offset < member_type->size) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static s32 btf_struct_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
bool is_union = BTF_INFO_KIND(t->info) == BTF_KIND_UNION;
|
const struct btf_member *member;
|
u32 meta_needed, last_offset;
|
struct btf *btf = env->btf;
|
u32 struct_size = t->size;
|
u32 offset;
|
u16 i;
|
|
meta_needed = btf_type_vlen(t) * sizeof(*member);
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
/* struct type either no name or a valid one */
|
if (t->name_off &&
|
!btf_name_valid_identifier(env->btf, t->name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
last_offset = 0;
|
for_each_member(i, t, member) {
|
if (!btf_name_offset_valid(btf, member->name_off)) {
|
btf_verifier_log_member(env, t, member,
|
"Invalid member name_offset:%u",
|
member->name_off);
|
return -EINVAL;
|
}
|
|
/* struct member either no name or a valid one */
|
if (member->name_off &&
|
!btf_name_valid_identifier(btf, member->name_off)) {
|
btf_verifier_log_member(env, t, member, "Invalid name");
|
return -EINVAL;
|
}
|
/* A member cannot be in type void */
|
if (!member->type || !BTF_TYPE_ID_VALID(member->type)) {
|
btf_verifier_log_member(env, t, member,
|
"Invalid type_id");
|
return -EINVAL;
|
}
|
|
offset = btf_member_bit_offset(t, member);
|
if (is_union && offset) {
|
btf_verifier_log_member(env, t, member,
|
"Invalid member bits_offset");
|
return -EINVAL;
|
}
|
|
/*
|
* ">" instead of ">=" because the last member could be
|
* "char a[0];"
|
*/
|
if (last_offset > offset) {
|
btf_verifier_log_member(env, t, member,
|
"Invalid member bits_offset");
|
return -EINVAL;
|
}
|
|
if (BITS_ROUNDUP_BYTES(offset) > struct_size) {
|
btf_verifier_log_member(env, t, member,
|
"Member bits_offset exceeds its struct size");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_member(env, t, member, NULL);
|
last_offset = offset;
|
}
|
|
return meta_needed;
|
}
|
|
static int btf_struct_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
const struct btf_member *member;
|
int err;
|
u16 i;
|
|
/* Before continue resolving the next_member,
|
* ensure the last member is indeed resolved to a
|
* type with size info.
|
*/
|
if (v->next_member) {
|
const struct btf_type *last_member_type;
|
const struct btf_member *last_member;
|
u32 last_member_type_id;
|
|
last_member = btf_type_member(v->t) + v->next_member - 1;
|
last_member_type_id = last_member->type;
|
if (WARN_ON_ONCE(!env_type_is_resolved(env,
|
last_member_type_id)))
|
return -EINVAL;
|
|
last_member_type = btf_type_by_id(env->btf,
|
last_member_type_id);
|
if (btf_type_kflag(v->t))
|
err = btf_type_ops(last_member_type)->check_kflag_member(env, v->t,
|
last_member,
|
last_member_type);
|
else
|
err = btf_type_ops(last_member_type)->check_member(env, v->t,
|
last_member,
|
last_member_type);
|
if (err)
|
return err;
|
}
|
|
for_each_member_from(i, v->next_member, v->t, member) {
|
u32 member_type_id = member->type;
|
const struct btf_type *member_type = btf_type_by_id(env->btf,
|
member_type_id);
|
|
if (btf_type_nosize_or_null(member_type) ||
|
btf_type_is_resolve_source_only(member_type)) {
|
btf_verifier_log_member(env, v->t, member,
|
"Invalid member");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, member_type) &&
|
!env_type_is_resolved(env, member_type_id)) {
|
env_stack_set_next_member(env, i + 1);
|
return env_stack_push(env, member_type, member_type_id);
|
}
|
|
if (btf_type_kflag(v->t))
|
err = btf_type_ops(member_type)->check_kflag_member(env, v->t,
|
member,
|
member_type);
|
else
|
err = btf_type_ops(member_type)->check_member(env, v->t,
|
member,
|
member_type);
|
if (err)
|
return err;
|
}
|
|
env_stack_pop_resolved(env, 0, 0);
|
|
return 0;
|
}
|
|
static void btf_struct_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
btf_verifier_log(env, "size=%u vlen=%u", t->size, btf_type_vlen(t));
|
}
|
|
/* find 'struct bpf_spin_lock' in map value.
|
* return >= 0 offset if found
|
* and < 0 in case of error
|
*/
|
int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t)
|
{
|
const struct btf_member *member;
|
u32 i, off = -ENOENT;
|
|
if (!__btf_type_is_struct(t))
|
return -EINVAL;
|
|
for_each_member(i, t, member) {
|
const struct btf_type *member_type = btf_type_by_id(btf,
|
member->type);
|
if (!__btf_type_is_struct(member_type))
|
continue;
|
if (member_type->size != sizeof(struct bpf_spin_lock))
|
continue;
|
if (strcmp(__btf_name_by_offset(btf, member_type->name_off),
|
"bpf_spin_lock"))
|
continue;
|
if (off != -ENOENT)
|
/* only one 'struct bpf_spin_lock' is allowed */
|
return -E2BIG;
|
off = btf_member_bit_offset(t, member);
|
if (off % 8)
|
/* valid C code cannot generate such BTF */
|
return -EINVAL;
|
off /= 8;
|
if (off % __alignof__(struct bpf_spin_lock))
|
/* valid struct bpf_spin_lock will be 4 byte aligned */
|
return -EINVAL;
|
}
|
return off;
|
}
|
|
static void __btf_struct_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
const struct btf_member *member;
|
void *safe_data;
|
u32 i;
|
|
safe_data = btf_show_start_struct_type(show, t, type_id, data);
|
if (!safe_data)
|
return;
|
|
for_each_member(i, t, member) {
|
const struct btf_type *member_type = btf_type_by_id(btf,
|
member->type);
|
const struct btf_kind_operations *ops;
|
u32 member_offset, bitfield_size;
|
u32 bytes_offset;
|
u8 bits8_offset;
|
|
btf_show_start_member(show, member);
|
|
member_offset = btf_member_bit_offset(t, member);
|
bitfield_size = btf_member_bitfield_size(t, member);
|
bytes_offset = BITS_ROUNDDOWN_BYTES(member_offset);
|
bits8_offset = BITS_PER_BYTE_MASKED(member_offset);
|
if (bitfield_size) {
|
safe_data = btf_show_start_type(show, member_type,
|
member->type,
|
data + bytes_offset);
|
if (safe_data)
|
btf_bitfield_show(safe_data,
|
bits8_offset,
|
bitfield_size, show);
|
btf_show_end_type(show);
|
} else {
|
ops = btf_type_ops(member_type);
|
ops->show(btf, member_type, member->type,
|
data + bytes_offset, bits8_offset, show);
|
}
|
|
btf_show_end_member(show);
|
}
|
|
btf_show_end_struct_type(show);
|
}
|
|
static void btf_struct_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
const struct btf_member *m = show->state.member;
|
|
/*
|
* First check if any members would be shown (are non-zero).
|
* See comments above "struct btf_show" definition for more
|
* details on how this works at a high-level.
|
*/
|
if (show->state.depth > 0 && !(show->flags & BTF_SHOW_ZERO)) {
|
if (!show->state.depth_check) {
|
show->state.depth_check = show->state.depth + 1;
|
show->state.depth_to_show = 0;
|
}
|
__btf_struct_show(btf, t, type_id, data, bits_offset, show);
|
/* Restore saved member data here */
|
show->state.member = m;
|
if (show->state.depth_check != show->state.depth + 1)
|
return;
|
show->state.depth_check = 0;
|
|
if (show->state.depth_to_show <= show->state.depth)
|
return;
|
/*
|
* Reaching here indicates we have recursed and found
|
* non-zero child values.
|
*/
|
}
|
|
__btf_struct_show(btf, t, type_id, data, bits_offset, show);
|
}
|
|
static struct btf_kind_operations struct_ops = {
|
.check_meta = btf_struct_check_meta,
|
.resolve = btf_struct_resolve,
|
.check_member = btf_struct_check_member,
|
.check_kflag_member = btf_generic_check_kflag_member,
|
.log_details = btf_struct_log,
|
.show = btf_struct_show,
|
};
|
|
static int btf_enum_check_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 struct_bits_off = member->offset;
|
u32 struct_size, bytes_offset;
|
|
if (BITS_PER_BYTE_MASKED(struct_bits_off)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member is not byte aligned");
|
return -EINVAL;
|
}
|
|
struct_size = struct_type->size;
|
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
|
if (struct_size - bytes_offset < member_type->size) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static int btf_enum_check_kflag_member(struct btf_verifier_env *env,
|
const struct btf_type *struct_type,
|
const struct btf_member *member,
|
const struct btf_type *member_type)
|
{
|
u32 struct_bits_off, nr_bits, bytes_end, struct_size;
|
u32 int_bitsize = sizeof(int) * BITS_PER_BYTE;
|
|
struct_bits_off = BTF_MEMBER_BIT_OFFSET(member->offset);
|
nr_bits = BTF_MEMBER_BITFIELD_SIZE(member->offset);
|
if (!nr_bits) {
|
if (BITS_PER_BYTE_MASKED(struct_bits_off)) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member is not byte aligned");
|
return -EINVAL;
|
}
|
|
nr_bits = int_bitsize;
|
} else if (nr_bits > int_bitsize) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Invalid member bitfield_size");
|
return -EINVAL;
|
}
|
|
struct_size = struct_type->size;
|
bytes_end = BITS_ROUNDUP_BYTES(struct_bits_off + nr_bits);
|
if (struct_size < bytes_end) {
|
btf_verifier_log_member(env, struct_type, member,
|
"Member exceeds struct_size");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static s32 btf_enum_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
const struct btf_enum *enums = btf_type_enum(t);
|
struct btf *btf = env->btf;
|
u16 i, nr_enums;
|
u32 meta_needed;
|
|
nr_enums = btf_type_vlen(t);
|
meta_needed = nr_enums * sizeof(*enums);
|
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
if (t->size > 8 || !is_power_of_2(t->size)) {
|
btf_verifier_log_type(env, t, "Unexpected size");
|
return -EINVAL;
|
}
|
|
/* enum type either no name or a valid one */
|
if (t->name_off &&
|
!btf_name_valid_identifier(env->btf, t->name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
for (i = 0; i < nr_enums; i++) {
|
if (!btf_name_offset_valid(btf, enums[i].name_off)) {
|
btf_verifier_log(env, "\tInvalid name_offset:%u",
|
enums[i].name_off);
|
return -EINVAL;
|
}
|
|
/* enum member must have a valid name */
|
if (!enums[i].name_off ||
|
!btf_name_valid_identifier(btf, enums[i].name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
if (env->log.level == BPF_LOG_KERNEL)
|
continue;
|
btf_verifier_log(env, "\t%s val=%d\n",
|
__btf_name_by_offset(btf, enums[i].name_off),
|
enums[i].val);
|
}
|
|
return meta_needed;
|
}
|
|
static void btf_enum_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
btf_verifier_log(env, "size=%u vlen=%u", t->size, btf_type_vlen(t));
|
}
|
|
static void btf_enum_show(const struct btf *btf, const struct btf_type *t,
|
u32 type_id, void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
const struct btf_enum *enums = btf_type_enum(t);
|
u32 i, nr_enums = btf_type_vlen(t);
|
void *safe_data;
|
int v;
|
|
safe_data = btf_show_start_type(show, t, type_id, data);
|
if (!safe_data)
|
return;
|
|
v = *(int *)safe_data;
|
|
for (i = 0; i < nr_enums; i++) {
|
if (v != enums[i].val)
|
continue;
|
|
btf_show_type_value(show, "%s",
|
__btf_name_by_offset(btf,
|
enums[i].name_off));
|
|
btf_show_end_type(show);
|
return;
|
}
|
|
btf_show_type_value(show, "%d", v);
|
btf_show_end_type(show);
|
}
|
|
static struct btf_kind_operations enum_ops = {
|
.check_meta = btf_enum_check_meta,
|
.resolve = btf_df_resolve,
|
.check_member = btf_enum_check_member,
|
.check_kflag_member = btf_enum_check_kflag_member,
|
.log_details = btf_enum_log,
|
.show = btf_enum_show,
|
};
|
|
static s32 btf_func_proto_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
u32 meta_needed = btf_type_vlen(t) * sizeof(struct btf_param);
|
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
if (t->name_off) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return meta_needed;
|
}
|
|
static void btf_func_proto_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
const struct btf_param *args = (const struct btf_param *)(t + 1);
|
u16 nr_args = btf_type_vlen(t), i;
|
|
btf_verifier_log(env, "return=%u args=(", t->type);
|
if (!nr_args) {
|
btf_verifier_log(env, "void");
|
goto done;
|
}
|
|
if (nr_args == 1 && !args[0].type) {
|
/* Only one vararg */
|
btf_verifier_log(env, "vararg");
|
goto done;
|
}
|
|
btf_verifier_log(env, "%u %s", args[0].type,
|
__btf_name_by_offset(env->btf,
|
args[0].name_off));
|
for (i = 1; i < nr_args - 1; i++)
|
btf_verifier_log(env, ", %u %s", args[i].type,
|
__btf_name_by_offset(env->btf,
|
args[i].name_off));
|
|
if (nr_args > 1) {
|
const struct btf_param *last_arg = &args[nr_args - 1];
|
|
if (last_arg->type)
|
btf_verifier_log(env, ", %u %s", last_arg->type,
|
__btf_name_by_offset(env->btf,
|
last_arg->name_off));
|
else
|
btf_verifier_log(env, ", vararg");
|
}
|
|
done:
|
btf_verifier_log(env, ")");
|
}
|
|
static struct btf_kind_operations func_proto_ops = {
|
.check_meta = btf_func_proto_check_meta,
|
.resolve = btf_df_resolve,
|
/*
|
* BTF_KIND_FUNC_PROTO cannot be directly referred by
|
* a struct's member.
|
*
|
* It should be a funciton pointer instead.
|
* (i.e. struct's member -> BTF_KIND_PTR -> BTF_KIND_FUNC_PROTO)
|
*
|
* Hence, there is no btf_func_check_member().
|
*/
|
.check_member = btf_df_check_member,
|
.check_kflag_member = btf_df_check_kflag_member,
|
.log_details = btf_func_proto_log,
|
.show = btf_df_show,
|
};
|
|
static s32 btf_func_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
if (!t->name_off ||
|
!btf_name_valid_identifier(env->btf, t->name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
if (btf_type_vlen(t) > BTF_FUNC_GLOBAL) {
|
btf_verifier_log_type(env, t, "Invalid func linkage");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return 0;
|
}
|
|
static struct btf_kind_operations func_ops = {
|
.check_meta = btf_func_check_meta,
|
.resolve = btf_df_resolve,
|
.check_member = btf_df_check_member,
|
.check_kflag_member = btf_df_check_kflag_member,
|
.log_details = btf_ref_type_log,
|
.show = btf_df_show,
|
};
|
|
static s32 btf_var_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
const struct btf_var *var;
|
u32 meta_needed = sizeof(*var);
|
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
if (btf_type_vlen(t)) {
|
btf_verifier_log_type(env, t, "vlen != 0");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
if (!t->name_off ||
|
!__btf_name_valid(env->btf, t->name_off, true)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
/* A var cannot be in type void */
|
if (!t->type || !BTF_TYPE_ID_VALID(t->type)) {
|
btf_verifier_log_type(env, t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
var = btf_type_var(t);
|
if (var->linkage != BTF_VAR_STATIC &&
|
var->linkage != BTF_VAR_GLOBAL_ALLOCATED) {
|
btf_verifier_log_type(env, t, "Linkage not supported");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
return meta_needed;
|
}
|
|
static void btf_var_log(struct btf_verifier_env *env, const struct btf_type *t)
|
{
|
const struct btf_var *var = btf_type_var(t);
|
|
btf_verifier_log(env, "type_id=%u linkage=%u", t->type, var->linkage);
|
}
|
|
static const struct btf_kind_operations var_ops = {
|
.check_meta = btf_var_check_meta,
|
.resolve = btf_var_resolve,
|
.check_member = btf_df_check_member,
|
.check_kflag_member = btf_df_check_kflag_member,
|
.log_details = btf_var_log,
|
.show = btf_var_show,
|
};
|
|
static s32 btf_datasec_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
const struct btf_var_secinfo *vsi;
|
u64 last_vsi_end_off = 0, sum = 0;
|
u32 i, meta_needed;
|
|
meta_needed = btf_type_vlen(t) * sizeof(*vsi);
|
if (meta_left < meta_needed) {
|
btf_verifier_log_basic(env, t,
|
"meta_left:%u meta_needed:%u",
|
meta_left, meta_needed);
|
return -EINVAL;
|
}
|
|
if (!btf_type_vlen(t)) {
|
btf_verifier_log_type(env, t, "vlen == 0");
|
return -EINVAL;
|
}
|
|
if (!t->size) {
|
btf_verifier_log_type(env, t, "size == 0");
|
return -EINVAL;
|
}
|
|
if (btf_type_kflag(t)) {
|
btf_verifier_log_type(env, t, "Invalid btf_info kind_flag");
|
return -EINVAL;
|
}
|
|
if (!t->name_off ||
|
!btf_name_valid_section(env->btf, t->name_off)) {
|
btf_verifier_log_type(env, t, "Invalid name");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_type(env, t, NULL);
|
|
for_each_vsi(i, t, vsi) {
|
/* A var cannot be in type void */
|
if (!vsi->type || !BTF_TYPE_ID_VALID(vsi->type)) {
|
btf_verifier_log_vsi(env, t, vsi,
|
"Invalid type_id");
|
return -EINVAL;
|
}
|
|
if (vsi->offset < last_vsi_end_off || vsi->offset >= t->size) {
|
btf_verifier_log_vsi(env, t, vsi,
|
"Invalid offset");
|
return -EINVAL;
|
}
|
|
if (!vsi->size || vsi->size > t->size) {
|
btf_verifier_log_vsi(env, t, vsi,
|
"Invalid size");
|
return -EINVAL;
|
}
|
|
last_vsi_end_off = vsi->offset + vsi->size;
|
if (last_vsi_end_off > t->size) {
|
btf_verifier_log_vsi(env, t, vsi,
|
"Invalid offset+size");
|
return -EINVAL;
|
}
|
|
btf_verifier_log_vsi(env, t, vsi, NULL);
|
sum += vsi->size;
|
}
|
|
if (t->size < sum) {
|
btf_verifier_log_type(env, t, "Invalid btf_info size");
|
return -EINVAL;
|
}
|
|
return meta_needed;
|
}
|
|
static int btf_datasec_resolve(struct btf_verifier_env *env,
|
const struct resolve_vertex *v)
|
{
|
const struct btf_var_secinfo *vsi;
|
struct btf *btf = env->btf;
|
u16 i;
|
|
for_each_vsi_from(i, v->next_member, v->t, vsi) {
|
u32 var_type_id = vsi->type, type_id, type_size = 0;
|
const struct btf_type *var_type = btf_type_by_id(env->btf,
|
var_type_id);
|
if (!var_type || !btf_type_is_var(var_type)) {
|
btf_verifier_log_vsi(env, v->t, vsi,
|
"Not a VAR kind member");
|
return -EINVAL;
|
}
|
|
if (!env_type_is_resolve_sink(env, var_type) &&
|
!env_type_is_resolved(env, var_type_id)) {
|
env_stack_set_next_member(env, i + 1);
|
return env_stack_push(env, var_type, var_type_id);
|
}
|
|
type_id = var_type->type;
|
if (!btf_type_id_size(btf, &type_id, &type_size)) {
|
btf_verifier_log_vsi(env, v->t, vsi, "Invalid type");
|
return -EINVAL;
|
}
|
|
if (vsi->size < type_size) {
|
btf_verifier_log_vsi(env, v->t, vsi, "Invalid size");
|
return -EINVAL;
|
}
|
}
|
|
env_stack_pop_resolved(env, 0, 0);
|
return 0;
|
}
|
|
static void btf_datasec_log(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
btf_verifier_log(env, "size=%u vlen=%u", t->size, btf_type_vlen(t));
|
}
|
|
static void btf_datasec_show(const struct btf *btf,
|
const struct btf_type *t, u32 type_id,
|
void *data, u8 bits_offset,
|
struct btf_show *show)
|
{
|
const struct btf_var_secinfo *vsi;
|
const struct btf_type *var;
|
u32 i;
|
|
if (!btf_show_start_type(show, t, type_id, data))
|
return;
|
|
btf_show_type_value(show, "section (\"%s\") = {",
|
__btf_name_by_offset(btf, t->name_off));
|
for_each_vsi(i, t, vsi) {
|
var = btf_type_by_id(btf, vsi->type);
|
if (i)
|
btf_show(show, ",");
|
btf_type_ops(var)->show(btf, var, vsi->type,
|
data + vsi->offset, bits_offset, show);
|
}
|
btf_show_end_type(show);
|
}
|
|
static const struct btf_kind_operations datasec_ops = {
|
.check_meta = btf_datasec_check_meta,
|
.resolve = btf_datasec_resolve,
|
.check_member = btf_df_check_member,
|
.check_kflag_member = btf_df_check_kflag_member,
|
.log_details = btf_datasec_log,
|
.show = btf_datasec_show,
|
};
|
|
static int btf_func_proto_check(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
const struct btf_type *ret_type;
|
const struct btf_param *args;
|
const struct btf *btf;
|
u16 nr_args, i;
|
int err;
|
|
btf = env->btf;
|
args = (const struct btf_param *)(t + 1);
|
nr_args = btf_type_vlen(t);
|
|
/* Check func return type which could be "void" (t->type == 0) */
|
if (t->type) {
|
u32 ret_type_id = t->type;
|
|
ret_type = btf_type_by_id(btf, ret_type_id);
|
if (!ret_type) {
|
btf_verifier_log_type(env, t, "Invalid return type");
|
return -EINVAL;
|
}
|
|
if (btf_type_needs_resolve(ret_type) &&
|
!env_type_is_resolved(env, ret_type_id)) {
|
err = btf_resolve(env, ret_type, ret_type_id);
|
if (err)
|
return err;
|
}
|
|
/* Ensure the return type is a type that has a size */
|
if (!btf_type_id_size(btf, &ret_type_id, NULL)) {
|
btf_verifier_log_type(env, t, "Invalid return type");
|
return -EINVAL;
|
}
|
}
|
|
if (!nr_args)
|
return 0;
|
|
/* Last func arg type_id could be 0 if it is a vararg */
|
if (!args[nr_args - 1].type) {
|
if (args[nr_args - 1].name_off) {
|
btf_verifier_log_type(env, t, "Invalid arg#%u",
|
nr_args);
|
return -EINVAL;
|
}
|
nr_args--;
|
}
|
|
err = 0;
|
for (i = 0; i < nr_args; i++) {
|
const struct btf_type *arg_type;
|
u32 arg_type_id;
|
|
arg_type_id = args[i].type;
|
arg_type = btf_type_by_id(btf, arg_type_id);
|
if (!arg_type) {
|
btf_verifier_log_type(env, t, "Invalid arg#%u", i + 1);
|
err = -EINVAL;
|
break;
|
}
|
|
if (args[i].name_off &&
|
(!btf_name_offset_valid(btf, args[i].name_off) ||
|
!btf_name_valid_identifier(btf, args[i].name_off))) {
|
btf_verifier_log_type(env, t,
|
"Invalid arg#%u", i + 1);
|
err = -EINVAL;
|
break;
|
}
|
|
if (btf_type_needs_resolve(arg_type) &&
|
!env_type_is_resolved(env, arg_type_id)) {
|
err = btf_resolve(env, arg_type, arg_type_id);
|
if (err)
|
break;
|
}
|
|
if (!btf_type_id_size(btf, &arg_type_id, NULL)) {
|
btf_verifier_log_type(env, t, "Invalid arg#%u", i + 1);
|
err = -EINVAL;
|
break;
|
}
|
}
|
|
return err;
|
}
|
|
static int btf_func_check(struct btf_verifier_env *env,
|
const struct btf_type *t)
|
{
|
const struct btf_type *proto_type;
|
const struct btf_param *args;
|
const struct btf *btf;
|
u16 nr_args, i;
|
|
btf = env->btf;
|
proto_type = btf_type_by_id(btf, t->type);
|
|
if (!proto_type || !btf_type_is_func_proto(proto_type)) {
|
btf_verifier_log_type(env, t, "Invalid type_id");
|
return -EINVAL;
|
}
|
|
args = (const struct btf_param *)(proto_type + 1);
|
nr_args = btf_type_vlen(proto_type);
|
for (i = 0; i < nr_args; i++) {
|
if (!args[i].name_off && args[i].type) {
|
btf_verifier_log_type(env, t, "Invalid arg#%u", i + 1);
|
return -EINVAL;
|
}
|
}
|
|
return 0;
|
}
|
|
static const struct btf_kind_operations * const kind_ops[NR_BTF_KINDS] = {
|
[BTF_KIND_INT] = &int_ops,
|
[BTF_KIND_PTR] = &ptr_ops,
|
[BTF_KIND_ARRAY] = &array_ops,
|
[BTF_KIND_STRUCT] = &struct_ops,
|
[BTF_KIND_UNION] = &struct_ops,
|
[BTF_KIND_ENUM] = &enum_ops,
|
[BTF_KIND_FWD] = &fwd_ops,
|
[BTF_KIND_TYPEDEF] = &modifier_ops,
|
[BTF_KIND_VOLATILE] = &modifier_ops,
|
[BTF_KIND_CONST] = &modifier_ops,
|
[BTF_KIND_RESTRICT] = &modifier_ops,
|
[BTF_KIND_FUNC] = &func_ops,
|
[BTF_KIND_FUNC_PROTO] = &func_proto_ops,
|
[BTF_KIND_VAR] = &var_ops,
|
[BTF_KIND_DATASEC] = &datasec_ops,
|
};
|
|
static s32 btf_check_meta(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 meta_left)
|
{
|
u32 saved_meta_left = meta_left;
|
s32 var_meta_size;
|
|
if (meta_left < sizeof(*t)) {
|
btf_verifier_log(env, "[%u] meta_left:%u meta_needed:%zu",
|
env->log_type_id, meta_left, sizeof(*t));
|
return -EINVAL;
|
}
|
meta_left -= sizeof(*t);
|
|
if (t->info & ~BTF_INFO_MASK) {
|
btf_verifier_log(env, "[%u] Invalid btf_info:%x",
|
env->log_type_id, t->info);
|
return -EINVAL;
|
}
|
|
if (BTF_INFO_KIND(t->info) > BTF_KIND_MAX ||
|
BTF_INFO_KIND(t->info) == BTF_KIND_UNKN) {
|
btf_verifier_log(env, "[%u] Invalid kind:%u",
|
env->log_type_id, BTF_INFO_KIND(t->info));
|
return -EINVAL;
|
}
|
|
if (!btf_name_offset_valid(env->btf, t->name_off)) {
|
btf_verifier_log(env, "[%u] Invalid name_offset:%u",
|
env->log_type_id, t->name_off);
|
return -EINVAL;
|
}
|
|
var_meta_size = btf_type_ops(t)->check_meta(env, t, meta_left);
|
if (var_meta_size < 0)
|
return var_meta_size;
|
|
meta_left -= var_meta_size;
|
|
return saved_meta_left - meta_left;
|
}
|
|
static int btf_check_all_metas(struct btf_verifier_env *env)
|
{
|
struct btf *btf = env->btf;
|
struct btf_header *hdr;
|
void *cur, *end;
|
|
hdr = &btf->hdr;
|
cur = btf->nohdr_data + hdr->type_off;
|
end = cur + hdr->type_len;
|
|
env->log_type_id = 1;
|
while (cur < end) {
|
struct btf_type *t = cur;
|
s32 meta_size;
|
|
meta_size = btf_check_meta(env, t, end - cur);
|
if (meta_size < 0)
|
return meta_size;
|
|
btf_add_type(env, t);
|
cur += meta_size;
|
env->log_type_id++;
|
}
|
|
return 0;
|
}
|
|
static bool btf_resolve_valid(struct btf_verifier_env *env,
|
const struct btf_type *t,
|
u32 type_id)
|
{
|
struct btf *btf = env->btf;
|
|
if (!env_type_is_resolved(env, type_id))
|
return false;
|
|
if (btf_type_is_struct(t) || btf_type_is_datasec(t))
|
return !btf->resolved_ids[type_id] &&
|
!btf->resolved_sizes[type_id];
|
|
if (btf_type_is_modifier(t) || btf_type_is_ptr(t) ||
|
btf_type_is_var(t)) {
|
t = btf_type_id_resolve(btf, &type_id);
|
return t &&
|
!btf_type_is_modifier(t) &&
|
!btf_type_is_var(t) &&
|
!btf_type_is_datasec(t);
|
}
|
|
if (btf_type_is_array(t)) {
|
const struct btf_array *array = btf_type_array(t);
|
const struct btf_type *elem_type;
|
u32 elem_type_id = array->type;
|
u32 elem_size;
|
|
elem_type = btf_type_id_size(btf, &elem_type_id, &elem_size);
|
return elem_type && !btf_type_is_modifier(elem_type) &&
|
(array->nelems * elem_size ==
|
btf->resolved_sizes[type_id]);
|
}
|
|
return false;
|
}
|
|
static int btf_resolve(struct btf_verifier_env *env,
|
const struct btf_type *t, u32 type_id)
|
{
|
u32 save_log_type_id = env->log_type_id;
|
const struct resolve_vertex *v;
|
int err = 0;
|
|
env->resolve_mode = RESOLVE_TBD;
|
env_stack_push(env, t, type_id);
|
while (!err && (v = env_stack_peak(env))) {
|
env->log_type_id = v->type_id;
|
err = btf_type_ops(v->t)->resolve(env, v);
|
}
|
|
env->log_type_id = type_id;
|
if (err == -E2BIG) {
|
btf_verifier_log_type(env, t,
|
"Exceeded max resolving depth:%u",
|
MAX_RESOLVE_DEPTH);
|
} else if (err == -EEXIST) {
|
btf_verifier_log_type(env, t, "Loop detected");
|
}
|
|
/* Final sanity check */
|
if (!err && !btf_resolve_valid(env, t, type_id)) {
|
btf_verifier_log_type(env, t, "Invalid resolve state");
|
err = -EINVAL;
|
}
|
|
env->log_type_id = save_log_type_id;
|
return err;
|
}
|
|
static int btf_check_all_types(struct btf_verifier_env *env)
|
{
|
struct btf *btf = env->btf;
|
u32 type_id;
|
int err;
|
|
err = env_resolve_init(env);
|
if (err)
|
return err;
|
|
env->phase++;
|
for (type_id = 1; type_id <= btf->nr_types; type_id++) {
|
const struct btf_type *t = btf_type_by_id(btf, type_id);
|
|
env->log_type_id = type_id;
|
if (btf_type_needs_resolve(t) &&
|
!env_type_is_resolved(env, type_id)) {
|
err = btf_resolve(env, t, type_id);
|
if (err)
|
return err;
|
}
|
|
if (btf_type_is_func_proto(t)) {
|
err = btf_func_proto_check(env, t);
|
if (err)
|
return err;
|
}
|
|
if (btf_type_is_func(t)) {
|
err = btf_func_check(env, t);
|
if (err)
|
return err;
|
}
|
}
|
|
return 0;
|
}
|
|
static int btf_parse_type_sec(struct btf_verifier_env *env)
|
{
|
const struct btf_header *hdr = &env->btf->hdr;
|
int err;
|
|
/* Type section must align to 4 bytes */
|
if (hdr->type_off & (sizeof(u32) - 1)) {
|
btf_verifier_log(env, "Unaligned type_off");
|
return -EINVAL;
|
}
|
|
if (!hdr->type_len) {
|
btf_verifier_log(env, "No type found");
|
return -EINVAL;
|
}
|
|
err = btf_check_all_metas(env);
|
if (err)
|
return err;
|
|
return btf_check_all_types(env);
|
}
|
|
static int btf_parse_str_sec(struct btf_verifier_env *env)
|
{
|
const struct btf_header *hdr;
|
struct btf *btf = env->btf;
|
const char *start, *end;
|
|
hdr = &btf->hdr;
|
start = btf->nohdr_data + hdr->str_off;
|
end = start + hdr->str_len;
|
|
if (end != btf->data + btf->data_size) {
|
btf_verifier_log(env, "String section is not at the end");
|
return -EINVAL;
|
}
|
|
if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_NAME_OFFSET ||
|
start[0] || end[-1]) {
|
btf_verifier_log(env, "Invalid string section");
|
return -EINVAL;
|
}
|
|
btf->strings = start;
|
|
return 0;
|
}
|
|
static const size_t btf_sec_info_offset[] = {
|
offsetof(struct btf_header, type_off),
|
offsetof(struct btf_header, str_off),
|
};
|
|
static int btf_sec_info_cmp(const void *a, const void *b)
|
{
|
const struct btf_sec_info *x = a;
|
const struct btf_sec_info *y = b;
|
|
return (int)(x->off - y->off) ? : (int)(x->len - y->len);
|
}
|
|
static int btf_check_sec_info(struct btf_verifier_env *env,
|
u32 btf_data_size)
|
{
|
struct btf_sec_info secs[ARRAY_SIZE(btf_sec_info_offset)];
|
u32 total, expected_total, i;
|
const struct btf_header *hdr;
|
const struct btf *btf;
|
|
btf = env->btf;
|
hdr = &btf->hdr;
|
|
/* Populate the secs from hdr */
|
for (i = 0; i < ARRAY_SIZE(btf_sec_info_offset); i++)
|
secs[i] = *(struct btf_sec_info *)((void *)hdr +
|
btf_sec_info_offset[i]);
|
|
sort(secs, ARRAY_SIZE(btf_sec_info_offset),
|
sizeof(struct btf_sec_info), btf_sec_info_cmp, NULL);
|
|
/* Check for gaps and overlap among sections */
|
total = 0;
|
expected_total = btf_data_size - hdr->hdr_len;
|
for (i = 0; i < ARRAY_SIZE(btf_sec_info_offset); i++) {
|
if (expected_total < secs[i].off) {
|
btf_verifier_log(env, "Invalid section offset");
|
return -EINVAL;
|
}
|
if (total < secs[i].off) {
|
/* gap */
|
btf_verifier_log(env, "Unsupported section found");
|
return -EINVAL;
|
}
|
if (total > secs[i].off) {
|
btf_verifier_log(env, "Section overlap found");
|
return -EINVAL;
|
}
|
if (expected_total - total < secs[i].len) {
|
btf_verifier_log(env,
|
"Total section length too long");
|
return -EINVAL;
|
}
|
total += secs[i].len;
|
}
|
|
/* There is data other than hdr and known sections */
|
if (expected_total != total) {
|
btf_verifier_log(env, "Unsupported section found");
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static int btf_parse_hdr(struct btf_verifier_env *env)
|
{
|
u32 hdr_len, hdr_copy, btf_data_size;
|
const struct btf_header *hdr;
|
struct btf *btf;
|
int err;
|
|
btf = env->btf;
|
btf_data_size = btf->data_size;
|
|
if (btf_data_size <
|
offsetof(struct btf_header, hdr_len) + sizeof(hdr->hdr_len)) {
|
btf_verifier_log(env, "hdr_len not found");
|
return -EINVAL;
|
}
|
|
hdr = btf->data;
|
hdr_len = hdr->hdr_len;
|
if (btf_data_size < hdr_len) {
|
btf_verifier_log(env, "btf_header not found");
|
return -EINVAL;
|
}
|
|
/* Ensure the unsupported header fields are zero */
|
if (hdr_len > sizeof(btf->hdr)) {
|
u8 *expected_zero = btf->data + sizeof(btf->hdr);
|
u8 *end = btf->data + hdr_len;
|
|
for (; expected_zero < end; expected_zero++) {
|
if (*expected_zero) {
|
btf_verifier_log(env, "Unsupported btf_header");
|
return -E2BIG;
|
}
|
}
|
}
|
|
hdr_copy = min_t(u32, hdr_len, sizeof(btf->hdr));
|
memcpy(&btf->hdr, btf->data, hdr_copy);
|
|
hdr = &btf->hdr;
|
|
btf_verifier_log_hdr(env, btf_data_size);
|
|
if (hdr->magic != BTF_MAGIC) {
|
btf_verifier_log(env, "Invalid magic");
|
return -EINVAL;
|
}
|
|
if (hdr->version != BTF_VERSION) {
|
btf_verifier_log(env, "Unsupported version");
|
return -ENOTSUPP;
|
}
|
|
if (hdr->flags) {
|
btf_verifier_log(env, "Unsupported flags");
|
return -ENOTSUPP;
|
}
|
|
if (btf_data_size == hdr->hdr_len) {
|
btf_verifier_log(env, "No data");
|
return -EINVAL;
|
}
|
|
err = btf_check_sec_info(env, btf_data_size);
|
if (err)
|
return err;
|
|
return 0;
|
}
|
|
static struct btf *btf_parse(void __user *btf_data, u32 btf_data_size,
|
u32 log_level, char __user *log_ubuf, u32 log_size)
|
{
|
struct btf_verifier_env *env = NULL;
|
struct bpf_verifier_log *log;
|
struct btf *btf = NULL;
|
u8 *data;
|
int err;
|
|
if (btf_data_size > BTF_MAX_SIZE)
|
return ERR_PTR(-E2BIG);
|
|
env = kzalloc(sizeof(*env), GFP_KERNEL | __GFP_NOWARN);
|
if (!env)
|
return ERR_PTR(-ENOMEM);
|
|
log = &env->log;
|
if (log_level || log_ubuf || log_size) {
|
/* user requested verbose verifier output
|
* and supplied buffer to store the verification trace
|
*/
|
log->level = log_level;
|
log->ubuf = log_ubuf;
|
log->len_total = log_size;
|
|
/* log attributes have to be sane */
|
if (!bpf_verifier_log_attr_valid(log)) {
|
err = -EINVAL;
|
goto errout;
|
}
|
}
|
|
btf = kzalloc(sizeof(*btf), GFP_KERNEL | __GFP_NOWARN);
|
if (!btf) {
|
err = -ENOMEM;
|
goto errout;
|
}
|
env->btf = btf;
|
|
data = kvmalloc(btf_data_size, GFP_KERNEL | __GFP_NOWARN);
|
if (!data) {
|
err = -ENOMEM;
|
goto errout;
|
}
|
|
btf->data = data;
|
btf->data_size = btf_data_size;
|
|
if (copy_from_user(data, btf_data, btf_data_size)) {
|
err = -EFAULT;
|
goto errout;
|
}
|
|
err = btf_parse_hdr(env);
|
if (err)
|
goto errout;
|
|
btf->nohdr_data = btf->data + btf->hdr.hdr_len;
|
|
err = btf_parse_str_sec(env);
|
if (err)
|
goto errout;
|
|
err = btf_parse_type_sec(env);
|
if (err)
|
goto errout;
|
|
if (log->level && bpf_verifier_log_full(log)) {
|
err = -ENOSPC;
|
goto errout;
|
}
|
|
btf_verifier_env_free(env);
|
refcount_set(&btf->refcnt, 1);
|
return btf;
|
|
errout:
|
btf_verifier_env_free(env);
|
if (btf)
|
btf_free(btf);
|
return ERR_PTR(err);
|
}
|
|
extern char __weak __start_BTF[];
|
extern char __weak __stop_BTF[];
|
extern struct btf *btf_vmlinux;
|
|
#define BPF_MAP_TYPE(_id, _ops)
|
#define BPF_LINK_TYPE(_id, _name)
|
static union {
|
struct bpf_ctx_convert {
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
|
prog_ctx_type _id##_prog; \
|
kern_ctx_type _id##_kern;
|
#include <linux/bpf_types.h>
|
#undef BPF_PROG_TYPE
|
} *__t;
|
/* 't' is written once under lock. Read many times. */
|
const struct btf_type *t;
|
} bpf_ctx_convert;
|
enum {
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
|
__ctx_convert##_id,
|
#include <linux/bpf_types.h>
|
#undef BPF_PROG_TYPE
|
__ctx_convert_unused, /* to avoid empty enum in extreme .config */
|
};
|
static u8 bpf_ctx_convert_map[] = {
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
|
[_id] = __ctx_convert##_id,
|
#include <linux/bpf_types.h>
|
#undef BPF_PROG_TYPE
|
0, /* avoid empty array */
|
};
|
#undef BPF_MAP_TYPE
|
#undef BPF_LINK_TYPE
|
|
static const struct btf_member *
|
btf_get_prog_ctx_type(struct bpf_verifier_log *log, struct btf *btf,
|
const struct btf_type *t, enum bpf_prog_type prog_type,
|
int arg)
|
{
|
const struct btf_type *conv_struct;
|
const struct btf_type *ctx_struct;
|
const struct btf_member *ctx_type;
|
const char *tname, *ctx_tname;
|
|
conv_struct = bpf_ctx_convert.t;
|
if (!conv_struct) {
|
bpf_log(log, "btf_vmlinux is malformed\n");
|
return NULL;
|
}
|
t = btf_type_by_id(btf, t->type);
|
while (btf_type_is_modifier(t))
|
t = btf_type_by_id(btf, t->type);
|
if (!btf_type_is_struct(t)) {
|
/* Only pointer to struct is supported for now.
|
* That means that BPF_PROG_TYPE_TRACEPOINT with BTF
|
* is not supported yet.
|
* BPF_PROG_TYPE_RAW_TRACEPOINT is fine.
|
*/
|
if (log->level & BPF_LOG_LEVEL)
|
bpf_log(log, "arg#%d type is not a struct\n", arg);
|
return NULL;
|
}
|
tname = btf_name_by_offset(btf, t->name_off);
|
if (!tname) {
|
bpf_log(log, "arg#%d struct doesn't have a name\n", arg);
|
return NULL;
|
}
|
/* prog_type is valid bpf program type. No need for bounds check. */
|
ctx_type = btf_type_member(conv_struct) + bpf_ctx_convert_map[prog_type] * 2;
|
/* ctx_struct is a pointer to prog_ctx_type in vmlinux.
|
* Like 'struct __sk_buff'
|
*/
|
ctx_struct = btf_type_by_id(btf_vmlinux, ctx_type->type);
|
if (!ctx_struct)
|
/* should not happen */
|
return NULL;
|
ctx_tname = btf_name_by_offset(btf_vmlinux, ctx_struct->name_off);
|
if (!ctx_tname) {
|
/* should not happen */
|
bpf_log(log, "Please fix kernel include/linux/bpf_types.h\n");
|
return NULL;
|
}
|
/* only compare that prog's ctx type name is the same as
|
* kernel expects. No need to compare field by field.
|
* It's ok for bpf prog to do:
|
* struct __sk_buff {};
|
* int socket_filter_bpf_prog(struct __sk_buff *skb)
|
* { // no fields of skb are ever used }
|
*/
|
if (strcmp(ctx_tname, tname))
|
return NULL;
|
return ctx_type;
|
}
|
|
static const struct bpf_map_ops * const btf_vmlinux_map_ops[] = {
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
|
#define BPF_LINK_TYPE(_id, _name)
|
#define BPF_MAP_TYPE(_id, _ops) \
|
[_id] = &_ops,
|
#include <linux/bpf_types.h>
|
#undef BPF_PROG_TYPE
|
#undef BPF_LINK_TYPE
|
#undef BPF_MAP_TYPE
|
};
|
|
static int btf_vmlinux_map_ids_init(const struct btf *btf,
|
struct bpf_verifier_log *log)
|
{
|
const struct bpf_map_ops *ops;
|
int i, btf_id;
|
|
for (i = 0; i < ARRAY_SIZE(btf_vmlinux_map_ops); ++i) {
|
ops = btf_vmlinux_map_ops[i];
|
if (!ops || (!ops->map_btf_name && !ops->map_btf_id))
|
continue;
|
if (!ops->map_btf_name || !ops->map_btf_id) {
|
bpf_log(log, "map type %d is misconfigured\n", i);
|
return -EINVAL;
|
}
|
btf_id = btf_find_by_name_kind(btf, ops->map_btf_name,
|
BTF_KIND_STRUCT);
|
if (btf_id < 0)
|
return btf_id;
|
*ops->map_btf_id = btf_id;
|
}
|
|
return 0;
|
}
|
|
static int btf_translate_to_vmlinux(struct bpf_verifier_log *log,
|
struct btf *btf,
|
const struct btf_type *t,
|
enum bpf_prog_type prog_type,
|
int arg)
|
{
|
const struct btf_member *prog_ctx_type, *kern_ctx_type;
|
|
prog_ctx_type = btf_get_prog_ctx_type(log, btf, t, prog_type, arg);
|
if (!prog_ctx_type)
|
return -ENOENT;
|
kern_ctx_type = prog_ctx_type + 1;
|
return kern_ctx_type->type;
|
}
|
|
BTF_ID_LIST(bpf_ctx_convert_btf_id)
|
BTF_ID(struct, bpf_ctx_convert)
|
|
struct btf *btf_parse_vmlinux(void)
|
{
|
struct btf_verifier_env *env = NULL;
|
struct bpf_verifier_log *log;
|
struct btf *btf = NULL;
|
int err;
|
|
env = kzalloc(sizeof(*env), GFP_KERNEL | __GFP_NOWARN);
|
if (!env)
|
return ERR_PTR(-ENOMEM);
|
|
log = &env->log;
|
log->level = BPF_LOG_KERNEL;
|
|
btf = kzalloc(sizeof(*btf), GFP_KERNEL | __GFP_NOWARN);
|
if (!btf) {
|
err = -ENOMEM;
|
goto errout;
|
}
|
env->btf = btf;
|
|
btf->data = __start_BTF;
|
btf->data_size = __stop_BTF - __start_BTF;
|
|
err = btf_parse_hdr(env);
|
if (err)
|
goto errout;
|
|
btf->nohdr_data = btf->data + btf->hdr.hdr_len;
|
|
err = btf_parse_str_sec(env);
|
if (err)
|
goto errout;
|
|
err = btf_check_all_metas(env);
|
if (err)
|
goto errout;
|
|
/* btf_parse_vmlinux() runs under bpf_verifier_lock */
|
bpf_ctx_convert.t = btf_type_by_id(btf, bpf_ctx_convert_btf_id[0]);
|
|
/* find bpf map structs for map_ptr access checking */
|
err = btf_vmlinux_map_ids_init(btf, log);
|
if (err < 0)
|
goto errout;
|
|
bpf_struct_ops_init(btf, log);
|
|
btf_verifier_env_free(env);
|
refcount_set(&btf->refcnt, 1);
|
return btf;
|
|
errout:
|
btf_verifier_env_free(env);
|
if (btf) {
|
kvfree(btf->types);
|
kfree(btf);
|
}
|
return ERR_PTR(err);
|
}
|
|
struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog)
|
{
|
struct bpf_prog *tgt_prog = prog->aux->dst_prog;
|
|
if (tgt_prog) {
|
return tgt_prog->aux->btf;
|
} else {
|
return btf_vmlinux;
|
}
|
}
|
|
static bool is_string_ptr(struct btf *btf, const struct btf_type *t)
|
{
|
/* t comes in already as a pointer */
|
t = btf_type_by_id(btf, t->type);
|
|
/* allow const */
|
if (BTF_INFO_KIND(t->info) == BTF_KIND_CONST)
|
t = btf_type_by_id(btf, t->type);
|
|
/* char, signed char, unsigned char */
|
return btf_type_is_int(t) && t->size == 1;
|
}
|
|
bool btf_ctx_access(int off, int size, enum bpf_access_type type,
|
const struct bpf_prog *prog,
|
struct bpf_insn_access_aux *info)
|
{
|
const struct btf_type *t = prog->aux->attach_func_proto;
|
struct bpf_prog *tgt_prog = prog->aux->dst_prog;
|
struct btf *btf = bpf_prog_get_target_btf(prog);
|
const char *tname = prog->aux->attach_func_name;
|
struct bpf_verifier_log *log = info->log;
|
const struct btf_param *args;
|
u32 nr_args, arg;
|
int i, ret;
|
|
if (off % 8) {
|
bpf_log(log, "func '%s' offset %d is not multiple of 8\n",
|
tname, off);
|
return false;
|
}
|
arg = off / 8;
|
args = (const struct btf_param *)(t + 1);
|
/* if (t == NULL) Fall back to default BPF prog with 5 u64 arguments */
|
nr_args = t ? btf_type_vlen(t) : 5;
|
if (prog->aux->attach_btf_trace) {
|
/* skip first 'void *__data' argument in btf_trace_##name typedef */
|
args++;
|
nr_args--;
|
}
|
|
if (arg > nr_args) {
|
bpf_log(log, "func '%s' doesn't have %d-th argument\n",
|
tname, arg + 1);
|
return false;
|
}
|
|
if (arg == nr_args) {
|
switch (prog->expected_attach_type) {
|
case BPF_LSM_MAC:
|
case BPF_TRACE_FEXIT:
|
/* When LSM programs are attached to void LSM hooks
|
* they use FEXIT trampolines and when attached to
|
* int LSM hooks, they use MODIFY_RETURN trampolines.
|
*
|
* While the LSM programs are BPF_MODIFY_RETURN-like
|
* the check:
|
*
|
* if (ret_type != 'int')
|
* return -EINVAL;
|
*
|
* is _not_ done here. This is still safe as LSM hooks
|
* have only void and int return types.
|
*/
|
if (!t)
|
return true;
|
t = btf_type_by_id(btf, t->type);
|
break;
|
case BPF_MODIFY_RETURN:
|
/* For now the BPF_MODIFY_RETURN can only be attached to
|
* functions that return an int.
|
*/
|
if (!t)
|
return false;
|
|
t = btf_type_skip_modifiers(btf, t->type, NULL);
|
if (!btf_type_is_small_int(t)) {
|
bpf_log(log,
|
"ret type %s not allowed for fmod_ret\n",
|
btf_kind_str[BTF_INFO_KIND(t->info)]);
|
return false;
|
}
|
break;
|
default:
|
bpf_log(log, "func '%s' doesn't have %d-th argument\n",
|
tname, arg + 1);
|
return false;
|
}
|
} else {
|
if (!t)
|
/* Default prog with 5 args */
|
return true;
|
t = btf_type_by_id(btf, args[arg].type);
|
}
|
|
/* skip modifiers */
|
while (btf_type_is_modifier(t))
|
t = btf_type_by_id(btf, t->type);
|
if (btf_type_is_small_int(t) || btf_type_is_enum(t))
|
/* accessing a scalar */
|
return true;
|
if (!btf_type_is_ptr(t)) {
|
bpf_log(log,
|
"func '%s' arg%d '%s' has type %s. Only pointer access is allowed\n",
|
tname, arg,
|
__btf_name_by_offset(btf, t->name_off),
|
btf_kind_str[BTF_INFO_KIND(t->info)]);
|
return false;
|
}
|
|
/* check for PTR_TO_RDONLY_BUF_OR_NULL or PTR_TO_RDWR_BUF_OR_NULL */
|
for (i = 0; i < prog->aux->ctx_arg_info_size; i++) {
|
const struct bpf_ctx_arg_aux *ctx_arg_info = &prog->aux->ctx_arg_info[i];
|
|
if (ctx_arg_info->offset == off &&
|
(ctx_arg_info->reg_type == PTR_TO_RDONLY_BUF_OR_NULL ||
|
ctx_arg_info->reg_type == PTR_TO_RDWR_BUF_OR_NULL)) {
|
info->reg_type = ctx_arg_info->reg_type;
|
return true;
|
}
|
}
|
|
if (t->type == 0)
|
/* This is a pointer to void.
|
* It is the same as scalar from the verifier safety pov.
|
* No further pointer walking is allowed.
|
*/
|
return true;
|
|
if (is_string_ptr(btf, t))
|
return true;
|
|
/* this is a pointer to another type */
|
for (i = 0; i < prog->aux->ctx_arg_info_size; i++) {
|
const struct bpf_ctx_arg_aux *ctx_arg_info = &prog->aux->ctx_arg_info[i];
|
|
if (ctx_arg_info->offset == off) {
|
info->reg_type = ctx_arg_info->reg_type;
|
info->btf_id = ctx_arg_info->btf_id;
|
return true;
|
}
|
}
|
|
info->reg_type = PTR_TO_BTF_ID;
|
if (tgt_prog) {
|
enum bpf_prog_type tgt_type;
|
|
if (tgt_prog->type == BPF_PROG_TYPE_EXT)
|
tgt_type = tgt_prog->aux->saved_dst_prog_type;
|
else
|
tgt_type = tgt_prog->type;
|
|
ret = btf_translate_to_vmlinux(log, btf, t, tgt_type, arg);
|
if (ret > 0) {
|
info->btf_id = ret;
|
return true;
|
} else {
|
return false;
|
}
|
}
|
|
info->btf_id = t->type;
|
t = btf_type_by_id(btf, t->type);
|
/* skip modifiers */
|
while (btf_type_is_modifier(t)) {
|
info->btf_id = t->type;
|
t = btf_type_by_id(btf, t->type);
|
}
|
if (!btf_type_is_struct(t)) {
|
bpf_log(log,
|
"func '%s' arg%d type %s is not a struct\n",
|
tname, arg, btf_kind_str[BTF_INFO_KIND(t->info)]);
|
return false;
|
}
|
bpf_log(log, "func '%s' arg%d has btf_id %d type %s '%s'\n",
|
tname, arg, info->btf_id, btf_kind_str[BTF_INFO_KIND(t->info)],
|
__btf_name_by_offset(btf, t->name_off));
|
return true;
|
}
|
|
enum bpf_struct_walk_result {
|
/* < 0 error */
|
WALK_SCALAR = 0,
|
WALK_PTR,
|
WALK_STRUCT,
|
};
|
|
static int btf_struct_walk(struct bpf_verifier_log *log,
|
const struct btf_type *t, int off, int size,
|
u32 *next_btf_id)
|
{
|
u32 i, moff, mtrue_end, msize = 0, total_nelems = 0;
|
const struct btf_type *mtype, *elem_type = NULL;
|
const struct btf_member *member;
|
const char *tname, *mname;
|
u32 vlen, elem_id, mid;
|
|
again:
|
tname = __btf_name_by_offset(btf_vmlinux, t->name_off);
|
if (!btf_type_is_struct(t)) {
|
bpf_log(log, "Type '%s' is not a struct\n", tname);
|
return -EINVAL;
|
}
|
|
vlen = btf_type_vlen(t);
|
if (off + size > t->size) {
|
/* If the last element is a variable size array, we may
|
* need to relax the rule.
|
*/
|
struct btf_array *array_elem;
|
|
if (vlen == 0)
|
goto error;
|
|
member = btf_type_member(t) + vlen - 1;
|
mtype = btf_type_skip_modifiers(btf_vmlinux, member->type,
|
NULL);
|
if (!btf_type_is_array(mtype))
|
goto error;
|
|
array_elem = (struct btf_array *)(mtype + 1);
|
if (array_elem->nelems != 0)
|
goto error;
|
|
moff = btf_member_bit_offset(t, member) / 8;
|
if (off < moff)
|
goto error;
|
|
/* Only allow structure for now, can be relaxed for
|
* other types later.
|
*/
|
t = btf_type_skip_modifiers(btf_vmlinux, array_elem->type,
|
NULL);
|
if (!btf_type_is_struct(t))
|
goto error;
|
|
off = (off - moff) % t->size;
|
goto again;
|
|
error:
|
bpf_log(log, "access beyond struct %s at off %u size %u\n",
|
tname, off, size);
|
return -EACCES;
|
}
|
|
for_each_member(i, t, member) {
|
/* offset of the field in bytes */
|
moff = btf_member_bit_offset(t, member) / 8;
|
if (off + size <= moff)
|
/* won't find anything, field is already too far */
|
break;
|
|
if (btf_member_bitfield_size(t, member)) {
|
u32 end_bit = btf_member_bit_offset(t, member) +
|
btf_member_bitfield_size(t, member);
|
|
/* off <= moff instead of off == moff because clang
|
* does not generate a BTF member for anonymous
|
* bitfield like the ":16" here:
|
* struct {
|
* int :16;
|
* int x:8;
|
* };
|
*/
|
if (off <= moff &&
|
BITS_ROUNDUP_BYTES(end_bit) <= off + size)
|
return WALK_SCALAR;
|
|
/* off may be accessing a following member
|
*
|
* or
|
*
|
* Doing partial access at either end of this
|
* bitfield. Continue on this case also to
|
* treat it as not accessing this bitfield
|
* and eventually error out as field not
|
* found to keep it simple.
|
* It could be relaxed if there was a legit
|
* partial access case later.
|
*/
|
continue;
|
}
|
|
/* In case of "off" is pointing to holes of a struct */
|
if (off < moff)
|
break;
|
|
/* type of the field */
|
mid = member->type;
|
mtype = btf_type_by_id(btf_vmlinux, member->type);
|
mname = __btf_name_by_offset(btf_vmlinux, member->name_off);
|
|
mtype = __btf_resolve_size(btf_vmlinux, mtype, &msize,
|
&elem_type, &elem_id, &total_nelems,
|
&mid);
|
if (IS_ERR(mtype)) {
|
bpf_log(log, "field %s doesn't have size\n", mname);
|
return -EFAULT;
|
}
|
|
mtrue_end = moff + msize;
|
if (off >= mtrue_end)
|
/* no overlap with member, keep iterating */
|
continue;
|
|
if (btf_type_is_array(mtype)) {
|
u32 elem_idx;
|
|
/* __btf_resolve_size() above helps to
|
* linearize a multi-dimensional array.
|
*
|
* The logic here is treating an array
|
* in a struct as the following way:
|
*
|
* struct outer {
|
* struct inner array[2][2];
|
* };
|
*
|
* looks like:
|
*
|
* struct outer {
|
* struct inner array_elem0;
|
* struct inner array_elem1;
|
* struct inner array_elem2;
|
* struct inner array_elem3;
|
* };
|
*
|
* When accessing outer->array[1][0], it moves
|
* moff to "array_elem2", set mtype to
|
* "struct inner", and msize also becomes
|
* sizeof(struct inner). Then most of the
|
* remaining logic will fall through without
|
* caring the current member is an array or
|
* not.
|
*
|
* Unlike mtype/msize/moff, mtrue_end does not
|
* change. The naming difference ("_true") tells
|
* that it is not always corresponding to
|
* the current mtype/msize/moff.
|
* It is the true end of the current
|
* member (i.e. array in this case). That
|
* will allow an int array to be accessed like
|
* a scratch space,
|
* i.e. allow access beyond the size of
|
* the array's element as long as it is
|
* within the mtrue_end boundary.
|
*/
|
|
/* skip empty array */
|
if (moff == mtrue_end)
|
continue;
|
|
msize /= total_nelems;
|
elem_idx = (off - moff) / msize;
|
moff += elem_idx * msize;
|
mtype = elem_type;
|
mid = elem_id;
|
}
|
|
/* the 'off' we're looking for is either equal to start
|
* of this field or inside of this struct
|
*/
|
if (btf_type_is_struct(mtype)) {
|
/* our field must be inside that union or struct */
|
t = mtype;
|
|
/* return if the offset matches the member offset */
|
if (off == moff) {
|
*next_btf_id = mid;
|
return WALK_STRUCT;
|
}
|
|
/* adjust offset we're looking for */
|
off -= moff;
|
goto again;
|
}
|
|
if (btf_type_is_ptr(mtype)) {
|
const struct btf_type *stype;
|
u32 id;
|
|
if (msize != size || off != moff) {
|
bpf_log(log,
|
"cannot access ptr member %s with moff %u in struct %s with off %u size %u\n",
|
mname, moff, tname, off, size);
|
return -EACCES;
|
}
|
stype = btf_type_skip_modifiers(btf_vmlinux, mtype->type, &id);
|
if (btf_type_is_struct(stype)) {
|
*next_btf_id = id;
|
return WALK_PTR;
|
}
|
}
|
|
/* Allow more flexible access within an int as long as
|
* it is within mtrue_end.
|
* Since mtrue_end could be the end of an array,
|
* that also allows using an array of int as a scratch
|
* space. e.g. skb->cb[].
|
*/
|
if (off + size > mtrue_end) {
|
bpf_log(log,
|
"access beyond the end of member %s (mend:%u) in struct %s with off %u size %u\n",
|
mname, mtrue_end, tname, off, size);
|
return -EACCES;
|
}
|
|
return WALK_SCALAR;
|
}
|
bpf_log(log, "struct %s doesn't have field at offset %d\n", tname, off);
|
return -EINVAL;
|
}
|
|
int btf_struct_access(struct bpf_verifier_log *log,
|
const struct btf_type *t, int off, int size,
|
enum bpf_access_type atype __maybe_unused,
|
u32 *next_btf_id)
|
{
|
int err;
|
u32 id;
|
|
do {
|
err = btf_struct_walk(log, t, off, size, &id);
|
|
switch (err) {
|
case WALK_PTR:
|
/* If we found the pointer or scalar on t+off,
|
* we're done.
|
*/
|
*next_btf_id = id;
|
return PTR_TO_BTF_ID;
|
case WALK_SCALAR:
|
return SCALAR_VALUE;
|
case WALK_STRUCT:
|
/* We found nested struct, so continue the search
|
* by diving in it. At this point the offset is
|
* aligned with the new type, so set it to 0.
|
*/
|
t = btf_type_by_id(btf_vmlinux, id);
|
off = 0;
|
break;
|
default:
|
/* It's either error or unknown return value..
|
* scream and leave.
|
*/
|
if (WARN_ONCE(err > 0, "unknown btf_struct_walk return value"))
|
return -EINVAL;
|
return err;
|
}
|
} while (t);
|
|
return -EINVAL;
|
}
|
|
bool btf_struct_ids_match(struct bpf_verifier_log *log,
|
int off, u32 id, u32 need_type_id)
|
{
|
const struct btf_type *type;
|
int err;
|
|
/* Are we already done? */
|
if (need_type_id == id && off == 0)
|
return true;
|
|
again:
|
type = btf_type_by_id(btf_vmlinux, id);
|
if (!type)
|
return false;
|
err = btf_struct_walk(log, type, off, 1, &id);
|
if (err != WALK_STRUCT)
|
return false;
|
|
/* We found nested struct object. If it matches
|
* the requested ID, we're done. Otherwise let's
|
* continue the search with offset 0 in the new
|
* type.
|
*/
|
if (need_type_id != id) {
|
off = 0;
|
goto again;
|
}
|
|
return true;
|
}
|
|
static int __get_type_size(struct btf *btf, u32 btf_id,
|
const struct btf_type **bad_type)
|
{
|
const struct btf_type *t;
|
|
if (!btf_id)
|
/* void */
|
return 0;
|
t = btf_type_by_id(btf, btf_id);
|
while (t && btf_type_is_modifier(t))
|
t = btf_type_by_id(btf, t->type);
|
if (!t) {
|
*bad_type = btf->types[0];
|
return -EINVAL;
|
}
|
if (btf_type_is_ptr(t))
|
/* kernel size of pointer. Not BPF's size of pointer*/
|
return sizeof(void *);
|
if (btf_type_is_int(t) || btf_type_is_enum(t))
|
return t->size;
|
*bad_type = t;
|
return -EINVAL;
|
}
|
|
int btf_distill_func_proto(struct bpf_verifier_log *log,
|
struct btf *btf,
|
const struct btf_type *func,
|
const char *tname,
|
struct btf_func_model *m)
|
{
|
const struct btf_param *args;
|
const struct btf_type *t;
|
u32 i, nargs;
|
int ret;
|
|
if (!func) {
|
/* BTF function prototype doesn't match the verifier types.
|
* Fall back to 5 u64 args.
|
*/
|
for (i = 0; i < 5; i++)
|
m->arg_size[i] = 8;
|
m->ret_size = 8;
|
m->nr_args = 5;
|
return 0;
|
}
|
args = (const struct btf_param *)(func + 1);
|
nargs = btf_type_vlen(func);
|
if (nargs >= MAX_BPF_FUNC_ARGS) {
|
bpf_log(log,
|
"The function %s has %d arguments. Too many.\n",
|
tname, nargs);
|
return -EINVAL;
|
}
|
ret = __get_type_size(btf, func->type, &t);
|
if (ret < 0) {
|
bpf_log(log,
|
"The function %s return type %s is unsupported.\n",
|
tname, btf_kind_str[BTF_INFO_KIND(t->info)]);
|
return -EINVAL;
|
}
|
m->ret_size = ret;
|
|
for (i = 0; i < nargs; i++) {
|
if (i == nargs - 1 && args[i].type == 0) {
|
bpf_log(log,
|
"The function %s with variable args is unsupported.\n",
|
tname);
|
return -EINVAL;
|
}
|
ret = __get_type_size(btf, args[i].type, &t);
|
if (ret < 0) {
|
bpf_log(log,
|
"The function %s arg%d type %s is unsupported.\n",
|
tname, i, btf_kind_str[BTF_INFO_KIND(t->info)]);
|
return -EINVAL;
|
}
|
if (ret == 0) {
|
bpf_log(log,
|
"The function %s has malformed void argument.\n",
|
tname);
|
return -EINVAL;
|
}
|
m->arg_size[i] = ret;
|
}
|
m->nr_args = nargs;
|
return 0;
|
}
|
|
/* Compare BTFs of two functions assuming only scalars and pointers to context.
|
* t1 points to BTF_KIND_FUNC in btf1
|
* t2 points to BTF_KIND_FUNC in btf2
|
* Returns:
|
* EINVAL - function prototype mismatch
|
* EFAULT - verifier bug
|
* 0 - 99% match. The last 1% is validated by the verifier.
|
*/
|
static int btf_check_func_type_match(struct bpf_verifier_log *log,
|
struct btf *btf1, const struct btf_type *t1,
|
struct btf *btf2, const struct btf_type *t2)
|
{
|
const struct btf_param *args1, *args2;
|
const char *fn1, *fn2, *s1, *s2;
|
u32 nargs1, nargs2, i;
|
|
fn1 = btf_name_by_offset(btf1, t1->name_off);
|
fn2 = btf_name_by_offset(btf2, t2->name_off);
|
|
if (btf_func_linkage(t1) != BTF_FUNC_GLOBAL) {
|
bpf_log(log, "%s() is not a global function\n", fn1);
|
return -EINVAL;
|
}
|
if (btf_func_linkage(t2) != BTF_FUNC_GLOBAL) {
|
bpf_log(log, "%s() is not a global function\n", fn2);
|
return -EINVAL;
|
}
|
|
t1 = btf_type_by_id(btf1, t1->type);
|
if (!t1 || !btf_type_is_func_proto(t1))
|
return -EFAULT;
|
t2 = btf_type_by_id(btf2, t2->type);
|
if (!t2 || !btf_type_is_func_proto(t2))
|
return -EFAULT;
|
|
args1 = (const struct btf_param *)(t1 + 1);
|
nargs1 = btf_type_vlen(t1);
|
args2 = (const struct btf_param *)(t2 + 1);
|
nargs2 = btf_type_vlen(t2);
|
|
if (nargs1 != nargs2) {
|
bpf_log(log, "%s() has %d args while %s() has %d args\n",
|
fn1, nargs1, fn2, nargs2);
|
return -EINVAL;
|
}
|
|
t1 = btf_type_skip_modifiers(btf1, t1->type, NULL);
|
t2 = btf_type_skip_modifiers(btf2, t2->type, NULL);
|
if (t1->info != t2->info) {
|
bpf_log(log,
|
"Return type %s of %s() doesn't match type %s of %s()\n",
|
btf_type_str(t1), fn1,
|
btf_type_str(t2), fn2);
|
return -EINVAL;
|
}
|
|
for (i = 0; i < nargs1; i++) {
|
t1 = btf_type_skip_modifiers(btf1, args1[i].type, NULL);
|
t2 = btf_type_skip_modifiers(btf2, args2[i].type, NULL);
|
|
if (t1->info != t2->info) {
|
bpf_log(log, "arg%d in %s() is %s while %s() has %s\n",
|
i, fn1, btf_type_str(t1),
|
fn2, btf_type_str(t2));
|
return -EINVAL;
|
}
|
if (btf_type_has_size(t1) && t1->size != t2->size) {
|
bpf_log(log,
|
"arg%d in %s() has size %d while %s() has %d\n",
|
i, fn1, t1->size,
|
fn2, t2->size);
|
return -EINVAL;
|
}
|
|
/* global functions are validated with scalars and pointers
|
* to context only. And only global functions can be replaced.
|
* Hence type check only those types.
|
*/
|
if (btf_type_is_int(t1) || btf_type_is_enum(t1))
|
continue;
|
if (!btf_type_is_ptr(t1)) {
|
bpf_log(log,
|
"arg%d in %s() has unrecognized type\n",
|
i, fn1);
|
return -EINVAL;
|
}
|
t1 = btf_type_skip_modifiers(btf1, t1->type, NULL);
|
t2 = btf_type_skip_modifiers(btf2, t2->type, NULL);
|
if (!btf_type_is_struct(t1)) {
|
bpf_log(log,
|
"arg%d in %s() is not a pointer to context\n",
|
i, fn1);
|
return -EINVAL;
|
}
|
if (!btf_type_is_struct(t2)) {
|
bpf_log(log,
|
"arg%d in %s() is not a pointer to context\n",
|
i, fn2);
|
return -EINVAL;
|
}
|
/* This is an optional check to make program writing easier.
|
* Compare names of structs and report an error to the user.
|
* btf_prepare_func_args() already checked that t2 struct
|
* is a context type. btf_prepare_func_args() will check
|
* later that t1 struct is a context type as well.
|
*/
|
s1 = btf_name_by_offset(btf1, t1->name_off);
|
s2 = btf_name_by_offset(btf2, t2->name_off);
|
if (strcmp(s1, s2)) {
|
bpf_log(log,
|
"arg%d %s(struct %s *) doesn't match %s(struct %s *)\n",
|
i, fn1, s1, fn2, s2);
|
return -EINVAL;
|
}
|
}
|
return 0;
|
}
|
|
/* Compare BTFs of given program with BTF of target program */
|
int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
|
struct btf *btf2, const struct btf_type *t2)
|
{
|
struct btf *btf1 = prog->aux->btf;
|
const struct btf_type *t1;
|
u32 btf_id = 0;
|
|
if (!prog->aux->func_info) {
|
bpf_log(log, "Program extension requires BTF\n");
|
return -EINVAL;
|
}
|
|
btf_id = prog->aux->func_info[0].type_id;
|
if (!btf_id)
|
return -EFAULT;
|
|
t1 = btf_type_by_id(btf1, btf_id);
|
if (!t1 || !btf_type_is_func(t1))
|
return -EFAULT;
|
|
return btf_check_func_type_match(log, btf1, t1, btf2, t2);
|
}
|
|
/* Compare BTF of a function with given bpf_reg_state.
|
* Returns:
|
* EFAULT - there is a verifier bug. Abort verification.
|
* EINVAL - there is a type mismatch or BTF is not available.
|
* 0 - BTF matches with what bpf_reg_state expects.
|
* Only PTR_TO_CTX and SCALAR_VALUE states are recognized.
|
*/
|
int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
|
struct bpf_reg_state *reg)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
struct bpf_prog *prog = env->prog;
|
struct btf *btf = prog->aux->btf;
|
const struct btf_param *args;
|
const struct btf_type *t;
|
u32 i, nargs, btf_id;
|
const char *tname;
|
|
if (!prog->aux->func_info)
|
return -EINVAL;
|
|
btf_id = prog->aux->func_info[subprog].type_id;
|
if (!btf_id)
|
return -EFAULT;
|
|
if (prog->aux->func_info_aux[subprog].unreliable)
|
return -EINVAL;
|
|
t = btf_type_by_id(btf, btf_id);
|
if (!t || !btf_type_is_func(t)) {
|
/* These checks were already done by the verifier while loading
|
* struct bpf_func_info
|
*/
|
bpf_log(log, "BTF of func#%d doesn't point to KIND_FUNC\n",
|
subprog);
|
return -EFAULT;
|
}
|
tname = btf_name_by_offset(btf, t->name_off);
|
|
t = btf_type_by_id(btf, t->type);
|
if (!t || !btf_type_is_func_proto(t)) {
|
bpf_log(log, "Invalid BTF of func %s\n", tname);
|
return -EFAULT;
|
}
|
args = (const struct btf_param *)(t + 1);
|
nargs = btf_type_vlen(t);
|
if (nargs > 5) {
|
bpf_log(log, "Function %s has %d > 5 args\n", tname, nargs);
|
goto out;
|
}
|
/* check that BTF function arguments match actual types that the
|
* verifier sees.
|
*/
|
for (i = 0; i < nargs; i++) {
|
t = btf_type_by_id(btf, args[i].type);
|
while (btf_type_is_modifier(t))
|
t = btf_type_by_id(btf, t->type);
|
if (btf_type_is_int(t) || btf_type_is_enum(t)) {
|
if (reg[i + 1].type == SCALAR_VALUE)
|
continue;
|
bpf_log(log, "R%d is not a scalar\n", i + 1);
|
goto out;
|
}
|
if (btf_type_is_ptr(t)) {
|
if (reg[i + 1].type == SCALAR_VALUE) {
|
bpf_log(log, "R%d is not a pointer\n", i + 1);
|
goto out;
|
}
|
/* If function expects ctx type in BTF check that caller
|
* is passing PTR_TO_CTX.
|
*/
|
if (btf_get_prog_ctx_type(log, btf, t, prog->type, i)) {
|
if (reg[i + 1].type != PTR_TO_CTX) {
|
bpf_log(log,
|
"arg#%d expected pointer to ctx, but got %s\n",
|
i, btf_kind_str[BTF_INFO_KIND(t->info)]);
|
goto out;
|
}
|
if (check_ctx_reg(env, ®[i + 1], i + 1))
|
goto out;
|
continue;
|
}
|
}
|
bpf_log(log, "Unrecognized arg#%d type %s\n",
|
i, btf_kind_str[BTF_INFO_KIND(t->info)]);
|
goto out;
|
}
|
return 0;
|
out:
|
/* Compiler optimizations can remove arguments from static functions
|
* or mismatched type can be passed into a global function.
|
* In such cases mark the function as unreliable from BTF point of view.
|
*/
|
prog->aux->func_info_aux[subprog].unreliable = true;
|
return -EINVAL;
|
}
|
|
/* Convert BTF of a function into bpf_reg_state if possible
|
* Returns:
|
* EFAULT - there is a verifier bug. Abort verification.
|
* EINVAL - cannot convert BTF.
|
* 0 - Successfully converted BTF into bpf_reg_state
|
* (either PTR_TO_CTX or SCALAR_VALUE).
|
*/
|
int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
|
struct bpf_reg_state *reg)
|
{
|
struct bpf_verifier_log *log = &env->log;
|
struct bpf_prog *prog = env->prog;
|
enum bpf_prog_type prog_type = prog->type;
|
struct btf *btf = prog->aux->btf;
|
const struct btf_param *args;
|
const struct btf_type *t;
|
u32 i, nargs, btf_id;
|
const char *tname;
|
|
if (!prog->aux->func_info ||
|
prog->aux->func_info_aux[subprog].linkage != BTF_FUNC_GLOBAL) {
|
bpf_log(log, "Verifier bug\n");
|
return -EFAULT;
|
}
|
|
btf_id = prog->aux->func_info[subprog].type_id;
|
if (!btf_id) {
|
bpf_log(log, "Global functions need valid BTF\n");
|
return -EFAULT;
|
}
|
|
t = btf_type_by_id(btf, btf_id);
|
if (!t || !btf_type_is_func(t)) {
|
/* These checks were already done by the verifier while loading
|
* struct bpf_func_info
|
*/
|
bpf_log(log, "BTF of func#%d doesn't point to KIND_FUNC\n",
|
subprog);
|
return -EFAULT;
|
}
|
tname = btf_name_by_offset(btf, t->name_off);
|
|
if (log->level & BPF_LOG_LEVEL)
|
bpf_log(log, "Validating %s() func#%d...\n",
|
tname, subprog);
|
|
if (prog->aux->func_info_aux[subprog].unreliable) {
|
bpf_log(log, "Verifier bug in function %s()\n", tname);
|
return -EFAULT;
|
}
|
if (prog_type == BPF_PROG_TYPE_EXT)
|
prog_type = prog->aux->dst_prog->type;
|
|
t = btf_type_by_id(btf, t->type);
|
if (!t || !btf_type_is_func_proto(t)) {
|
bpf_log(log, "Invalid type of function %s()\n", tname);
|
return -EFAULT;
|
}
|
args = (const struct btf_param *)(t + 1);
|
nargs = btf_type_vlen(t);
|
if (nargs > 5) {
|
bpf_log(log, "Global function %s() with %d > 5 args. Buggy compiler.\n",
|
tname, nargs);
|
return -EINVAL;
|
}
|
/* check that function returns int */
|
t = btf_type_by_id(btf, t->type);
|
while (btf_type_is_modifier(t))
|
t = btf_type_by_id(btf, t->type);
|
if (!btf_type_is_int(t) && !btf_type_is_enum(t)) {
|
bpf_log(log,
|
"Global function %s() doesn't return scalar. Only those are supported.\n",
|
tname);
|
return -EINVAL;
|
}
|
/* Convert BTF function arguments into verifier types.
|
* Only PTR_TO_CTX and SCALAR are supported atm.
|
*/
|
for (i = 0; i < nargs; i++) {
|
t = btf_type_by_id(btf, args[i].type);
|
while (btf_type_is_modifier(t))
|
t = btf_type_by_id(btf, t->type);
|
if (btf_type_is_int(t) || btf_type_is_enum(t)) {
|
reg[i + 1].type = SCALAR_VALUE;
|
continue;
|
}
|
if (btf_type_is_ptr(t) &&
|
btf_get_prog_ctx_type(log, btf, t, prog_type, i)) {
|
reg[i + 1].type = PTR_TO_CTX;
|
continue;
|
}
|
bpf_log(log, "Arg#%d type %s in %s() is not supported yet.\n",
|
i, btf_kind_str[BTF_INFO_KIND(t->info)], tname);
|
return -EINVAL;
|
}
|
return 0;
|
}
|
|
static void btf_type_show(const struct btf *btf, u32 type_id, void *obj,
|
struct btf_show *show)
|
{
|
const struct btf_type *t = btf_type_by_id(btf, type_id);
|
|
show->btf = btf;
|
memset(&show->state, 0, sizeof(show->state));
|
memset(&show->obj, 0, sizeof(show->obj));
|
|
btf_type_ops(t)->show(btf, t, type_id, obj, 0, show);
|
}
|
|
static void btf_seq_show(struct btf_show *show, const char *fmt,
|
va_list args)
|
{
|
seq_vprintf((struct seq_file *)show->target, fmt, args);
|
}
|
|
int btf_type_seq_show_flags(const struct btf *btf, u32 type_id,
|
void *obj, struct seq_file *m, u64 flags)
|
{
|
struct btf_show sseq;
|
|
sseq.target = m;
|
sseq.showfn = btf_seq_show;
|
sseq.flags = flags;
|
|
btf_type_show(btf, type_id, obj, &sseq);
|
|
return sseq.state.status;
|
}
|
|
void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
|
struct seq_file *m)
|
{
|
(void) btf_type_seq_show_flags(btf, type_id, obj, m,
|
BTF_SHOW_NONAME | BTF_SHOW_COMPACT |
|
BTF_SHOW_ZERO | BTF_SHOW_UNSAFE);
|
}
|
|
struct btf_show_snprintf {
|
struct btf_show show;
|
int len_left; /* space left in string */
|
int len; /* length we would have written */
|
};
|
|
static void btf_snprintf_show(struct btf_show *show, const char *fmt,
|
va_list args)
|
{
|
struct btf_show_snprintf *ssnprintf = (struct btf_show_snprintf *)show;
|
int len;
|
|
len = vsnprintf(show->target, ssnprintf->len_left, fmt, args);
|
|
if (len < 0) {
|
ssnprintf->len_left = 0;
|
ssnprintf->len = len;
|
} else if (len > ssnprintf->len_left) {
|
/* no space, drive on to get length we would have written */
|
ssnprintf->len_left = 0;
|
ssnprintf->len += len;
|
} else {
|
ssnprintf->len_left -= len;
|
ssnprintf->len += len;
|
show->target += len;
|
}
|
}
|
|
int btf_type_snprintf_show(const struct btf *btf, u32 type_id, void *obj,
|
char *buf, int len, u64 flags)
|
{
|
struct btf_show_snprintf ssnprintf;
|
|
ssnprintf.show.target = buf;
|
ssnprintf.show.flags = flags;
|
ssnprintf.show.showfn = btf_snprintf_show;
|
ssnprintf.len_left = len;
|
ssnprintf.len = 0;
|
|
btf_type_show(btf, type_id, obj, (struct btf_show *)&ssnprintf);
|
|
/* If we encontered an error, return it. */
|
if (ssnprintf.show.state.status)
|
return ssnprintf.show.state.status;
|
|
/* Otherwise return length we would have written */
|
return ssnprintf.len;
|
}
|
|
#ifdef CONFIG_PROC_FS
|
static void bpf_btf_show_fdinfo(struct seq_file *m, struct file *filp)
|
{
|
const struct btf *btf = filp->private_data;
|
|
seq_printf(m, "btf_id:\t%u\n", btf->id);
|
}
|
#endif
|
|
static int btf_release(struct inode *inode, struct file *filp)
|
{
|
btf_put(filp->private_data);
|
return 0;
|
}
|
|
const struct file_operations btf_fops = {
|
#ifdef CONFIG_PROC_FS
|
.show_fdinfo = bpf_btf_show_fdinfo,
|
#endif
|
.release = btf_release,
|
};
|
|
static int __btf_new_fd(struct btf *btf)
|
{
|
return anon_inode_getfd("btf", &btf_fops, btf, O_RDONLY | O_CLOEXEC);
|
}
|
|
int btf_new_fd(const union bpf_attr *attr)
|
{
|
struct btf *btf;
|
int ret;
|
|
btf = btf_parse(u64_to_user_ptr(attr->btf),
|
attr->btf_size, attr->btf_log_level,
|
u64_to_user_ptr(attr->btf_log_buf),
|
attr->btf_log_size);
|
if (IS_ERR(btf))
|
return PTR_ERR(btf);
|
|
ret = btf_alloc_id(btf);
|
if (ret) {
|
btf_free(btf);
|
return ret;
|
}
|
|
/*
|
* The BTF ID is published to the userspace.
|
* All BTF free must go through call_rcu() from
|
* now on (i.e. free by calling btf_put()).
|
*/
|
|
ret = __btf_new_fd(btf);
|
if (ret < 0)
|
btf_put(btf);
|
|
return ret;
|
}
|
|
struct btf *btf_get_by_fd(int fd)
|
{
|
struct btf *btf;
|
struct fd f;
|
|
f = fdget(fd);
|
|
if (!f.file)
|
return ERR_PTR(-EBADF);
|
|
if (f.file->f_op != &btf_fops) {
|
fdput(f);
|
return ERR_PTR(-EINVAL);
|
}
|
|
btf = f.file->private_data;
|
refcount_inc(&btf->refcnt);
|
fdput(f);
|
|
return btf;
|
}
|
|
int btf_get_info_by_fd(const struct btf *btf,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
struct bpf_btf_info __user *uinfo;
|
struct bpf_btf_info info;
|
u32 info_copy, btf_copy;
|
void __user *ubtf;
|
u32 uinfo_len;
|
|
uinfo = u64_to_user_ptr(attr->info.info);
|
uinfo_len = attr->info.info_len;
|
|
info_copy = min_t(u32, uinfo_len, sizeof(info));
|
memset(&info, 0, sizeof(info));
|
if (copy_from_user(&info, uinfo, info_copy))
|
return -EFAULT;
|
|
info.id = btf->id;
|
ubtf = u64_to_user_ptr(info.btf);
|
btf_copy = min_t(u32, btf->data_size, info.btf_size);
|
if (copy_to_user(ubtf, btf->data, btf_copy))
|
return -EFAULT;
|
info.btf_size = btf->data_size;
|
|
if (copy_to_user(uinfo, &info, info_copy) ||
|
put_user(info_copy, &uattr->info.info_len))
|
return -EFAULT;
|
|
return 0;
|
}
|
|
int btf_get_fd_by_id(u32 id)
|
{
|
struct btf *btf;
|
int fd;
|
|
rcu_read_lock();
|
btf = idr_find(&btf_idr, id);
|
if (!btf || !refcount_inc_not_zero(&btf->refcnt))
|
btf = ERR_PTR(-ENOENT);
|
rcu_read_unlock();
|
|
if (IS_ERR(btf))
|
return PTR_ERR(btf);
|
|
fd = __btf_new_fd(btf);
|
if (fd < 0)
|
btf_put(btf);
|
|
return fd;
|
}
|
|
u32 btf_id(const struct btf *btf)
|
{
|
return btf->id;
|
}
|
|
static int btf_id_cmp_func(const void *a, const void *b)
|
{
|
const int *pa = a, *pb = b;
|
|
return *pa - *pb;
|
}
|
|
bool btf_id_set_contains(const struct btf_id_set *set, u32 id)
|
{
|
return bsearch(&id, set->ids, set->cnt, sizeof(u32), btf_id_cmp_func) != NULL;
|
}
|
