// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/bpf.h>
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#include <stdint.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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char _license[] SEC("license") = "GPL";
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struct {
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char in[256];
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char out[256];
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} data = {};
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struct core_reloc_misc_output {
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int a, b, c;
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};
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struct core_reloc_misc___a {
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int a1;
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int a2;
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};
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struct core_reloc_misc___b {
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int b1;
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int b2;
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};
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/* fixed two first members, can be extended with new fields */
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struct core_reloc_misc_extensible {
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int a;
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int b;
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};
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#define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src)
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SEC("raw_tracepoint/sys_enter")
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int test_core_misc(void *ctx)
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{
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struct core_reloc_misc___a *in_a = (void *)&data.in;
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struct core_reloc_misc___b *in_b = (void *)&data.in;
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struct core_reloc_misc_extensible *in_ext = (void *)&data.in;
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struct core_reloc_misc_output *out = (void *)&data.out;
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/* record two different relocations with the same accessor string */
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if (CORE_READ(&out->a, &in_a->a1) || /* accessor: 0:0 */
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CORE_READ(&out->b, &in_b->b1)) /* accessor: 0:0 */
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return 1;
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/* Validate relocations capture array-only accesses for structs with
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* fixed header, but with potentially extendable tail. This will read
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* first 4 bytes of 2nd element of in_ext array of potentially
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* variably sized struct core_reloc_misc_extensible. */
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if (CORE_READ(&out->c, &in_ext[2])) /* accessor: 2 */
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return 1;
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return 0;
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}
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