From 01573e231f18eb2d99162747186f59511f56b64d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 08 Dec 2023 10:40:48 +0000
Subject: [PATCH] 移去rt
---
kernel/arch/xtensa/kernel/ptrace.c | 392 +++++++++++++++++++++++++++++++++-----------------------
1 files changed, 231 insertions(+), 161 deletions(-)
diff --git a/kernel/arch/xtensa/kernel/ptrace.c b/kernel/arch/xtensa/kernel/ptrace.c
index d9541be..db6cdea 100644
--- a/kernel/arch/xtensa/kernel/ptrace.c
+++ b/kernel/arch/xtensa/kernel/ptrace.c
@@ -12,35 +12,226 @@
* Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
*/
+#include <linux/audit.h>
#include <linux/errno.h>
#include <linux/hw_breakpoint.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/perf_event.h>
#include <linux/ptrace.h>
+#include <linux/regset.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
+#include <linux/seccomp.h>
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/tracehook.h>
#include <linux/uaccess.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
#include <asm/coprocessor.h>
#include <asm/elf.h>
#include <asm/page.h>
-#include <asm/pgtable.h>
#include <asm/ptrace.h>
+static int gpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ struct user_pt_regs newregs = {
+ .pc = regs->pc,
+ .ps = regs->ps & ~(1 << PS_EXCM_BIT),
+ .lbeg = regs->lbeg,
+ .lend = regs->lend,
+ .lcount = regs->lcount,
+ .sar = regs->sar,
+ .threadptr = regs->threadptr,
+ .windowbase = regs->windowbase,
+ .windowstart = regs->windowstart,
+ .syscall = regs->syscall,
+ };
+
+ memcpy(newregs.a,
+ regs->areg + XCHAL_NUM_AREGS - regs->windowbase * 4,
+ regs->windowbase * 16);
+ memcpy(newregs.a + regs->windowbase * 4,
+ regs->areg,
+ (WSBITS - regs->windowbase) * 16);
+
+ return membuf_write(&to, &newregs, sizeof(newregs));
+}
+
+static int gpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct user_pt_regs newregs = {0};
+ struct pt_regs *regs;
+ const u32 ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
+ if (ret)
+ return ret;
+
+ if (newregs.windowbase >= XCHAL_NUM_AREGS / 4)
+ return -EINVAL;
+
+ regs = task_pt_regs(target);
+ regs->pc = newregs.pc;
+ regs->ps = (regs->ps & ~ps_mask) | (newregs.ps & ps_mask);
+ regs->lbeg = newregs.lbeg;
+ regs->lend = newregs.lend;
+ regs->lcount = newregs.lcount;
+ regs->sar = newregs.sar;
+ regs->threadptr = newregs.threadptr;
+
+ if (newregs.syscall)
+ regs->syscall = newregs.syscall;
+
+ if (newregs.windowbase != regs->windowbase ||
+ newregs.windowstart != regs->windowstart) {
+ u32 rotws, wmask;
+
+ rotws = (((newregs.windowstart |
+ (newregs.windowstart << WSBITS)) >>
+ newregs.windowbase) &
+ ((1 << WSBITS) - 1)) & ~1;
+ wmask = ((rotws ? WSBITS + 1 - ffs(rotws) : 0) << 4) |
+ (rotws & 0xF) | 1;
+ regs->windowbase = newregs.windowbase;
+ regs->windowstart = newregs.windowstart;
+ regs->wmask = wmask;
+ }
+
+ memcpy(regs->areg + XCHAL_NUM_AREGS - newregs.windowbase * 4,
+ newregs.a, newregs.windowbase * 16);
+ memcpy(regs->areg, newregs.a + newregs.windowbase * 4,
+ (WSBITS - newregs.windowbase) * 16);
+
+ return 0;
+}
+
+static int tie_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ int ret;
+ struct pt_regs *regs = task_pt_regs(target);
+ struct thread_info *ti = task_thread_info(target);
+ elf_xtregs_t *newregs = kzalloc(sizeof(elf_xtregs_t), GFP_KERNEL);
+
+ if (!newregs)
+ return -ENOMEM;
+
+ newregs->opt = regs->xtregs_opt;
+ newregs->user = ti->xtregs_user;
+
+#if XTENSA_HAVE_COPROCESSORS
+ /* Flush all coprocessor registers to memory. */
+ coprocessor_flush_all(ti);
+ newregs->cp0 = ti->xtregs_cp.cp0;
+ newregs->cp1 = ti->xtregs_cp.cp1;
+ newregs->cp2 = ti->xtregs_cp.cp2;
+ newregs->cp3 = ti->xtregs_cp.cp3;
+ newregs->cp4 = ti->xtregs_cp.cp4;
+ newregs->cp5 = ti->xtregs_cp.cp5;
+ newregs->cp6 = ti->xtregs_cp.cp6;
+ newregs->cp7 = ti->xtregs_cp.cp7;
+#endif
+ ret = membuf_write(&to, newregs, sizeof(*newregs));
+ kfree(newregs);
+ return ret;
+}
+
+static int tie_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct pt_regs *regs = task_pt_regs(target);
+ struct thread_info *ti = task_thread_info(target);
+ elf_xtregs_t *newregs = kzalloc(sizeof(elf_xtregs_t), GFP_KERNEL);
+
+ if (!newregs)
+ return -ENOMEM;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ newregs, 0, -1);
+
+ if (ret)
+ goto exit;
+ regs->xtregs_opt = newregs->opt;
+ ti->xtregs_user = newregs->user;
+
+#if XTENSA_HAVE_COPROCESSORS
+ /* Flush all coprocessors before we overwrite them. */
+ coprocessor_flush_all(ti);
+ coprocessor_release_all(ti);
+ ti->xtregs_cp.cp0 = newregs->cp0;
+ ti->xtregs_cp.cp1 = newregs->cp1;
+ ti->xtregs_cp.cp2 = newregs->cp2;
+ ti->xtregs_cp.cp3 = newregs->cp3;
+ ti->xtregs_cp.cp4 = newregs->cp4;
+ ti->xtregs_cp.cp5 = newregs->cp5;
+ ti->xtregs_cp.cp6 = newregs->cp6;
+ ti->xtregs_cp.cp7 = newregs->cp7;
+#endif
+exit:
+ kfree(newregs);
+ return ret;
+}
+
+enum xtensa_regset {
+ REGSET_GPR,
+ REGSET_TIE,
+};
+
+static const struct user_regset xtensa_regsets[] = {
+ [REGSET_GPR] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = sizeof(struct user_pt_regs) / sizeof(u32),
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .regset_get = gpr_get,
+ .set = gpr_set,
+ },
+ [REGSET_TIE] = {
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(elf_xtregs_t) / sizeof(u32),
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .regset_get = tie_get,
+ .set = tie_set,
+ },
+};
+
+static const struct user_regset_view user_xtensa_view = {
+ .name = "xtensa",
+ .e_machine = EM_XTENSA,
+ .regsets = xtensa_regsets,
+ .n = ARRAY_SIZE(xtensa_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_xtensa_view;
+}
void user_enable_single_step(struct task_struct *child)
{
- child->ptrace |= PT_SINGLESTEP;
+ set_tsk_thread_flag(child, TIF_SINGLESTEP);
}
void user_disable_single_step(struct task_struct *child)
{
- child->ptrace &= ~PT_SINGLESTEP;
+ clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}
/*
@@ -54,161 +245,26 @@
static int ptrace_getregs(struct task_struct *child, void __user *uregs)
{
- struct pt_regs *regs = task_pt_regs(child);
- xtensa_gregset_t __user *gregset = uregs;
- unsigned long wb = regs->windowbase;
- int i;
-
- if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
- return -EIO;
-
- __put_user(regs->pc, &gregset->pc);
- __put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
- __put_user(regs->lbeg, &gregset->lbeg);
- __put_user(regs->lend, &gregset->lend);
- __put_user(regs->lcount, &gregset->lcount);
- __put_user(regs->windowstart, &gregset->windowstart);
- __put_user(regs->windowbase, &gregset->windowbase);
- __put_user(regs->threadptr, &gregset->threadptr);
-
- for (i = 0; i < XCHAL_NUM_AREGS; i++)
- __put_user(regs->areg[i],
- gregset->a + ((wb * 4 + i) % XCHAL_NUM_AREGS));
-
- return 0;
+ return copy_regset_to_user(child, &user_xtensa_view, REGSET_GPR,
+ 0, sizeof(xtensa_gregset_t), uregs);
}
static int ptrace_setregs(struct task_struct *child, void __user *uregs)
{
- struct pt_regs *regs = task_pt_regs(child);
- xtensa_gregset_t *gregset = uregs;
- const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
- unsigned long ps;
- unsigned long wb, ws;
-
- if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
- return -EIO;
-
- __get_user(regs->pc, &gregset->pc);
- __get_user(ps, &gregset->ps);
- __get_user(regs->lbeg, &gregset->lbeg);
- __get_user(regs->lend, &gregset->lend);
- __get_user(regs->lcount, &gregset->lcount);
- __get_user(ws, &gregset->windowstart);
- __get_user(wb, &gregset->windowbase);
- __get_user(regs->threadptr, &gregset->threadptr);
-
- regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);
-
- if (wb >= XCHAL_NUM_AREGS / 4)
- return -EFAULT;
-
- if (wb != regs->windowbase || ws != regs->windowstart) {
- unsigned long rotws, wmask;
-
- rotws = (((ws | (ws << WSBITS)) >> wb) &
- ((1 << WSBITS) - 1)) & ~1;
- wmask = ((rotws ? WSBITS + 1 - ffs(rotws) : 0) << 4) |
- (rotws & 0xF) | 1;
- regs->windowbase = wb;
- regs->windowstart = ws;
- regs->wmask = wmask;
- }
-
- if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
- gregset->a, wb * 16))
- return -EFAULT;
-
- if (__copy_from_user(regs->areg, gregset->a + wb * 4,
- (WSBITS - wb) * 16))
- return -EFAULT;
-
- return 0;
+ return copy_regset_from_user(child, &user_xtensa_view, REGSET_GPR,
+ 0, sizeof(xtensa_gregset_t), uregs);
}
-
-
-#if XTENSA_HAVE_COPROCESSORS
-#define CP_OFFSETS(cp) \
- { \
- .elf_xtregs_offset = offsetof(elf_xtregs_t, cp), \
- .ti_offset = offsetof(struct thread_info, xtregs_cp.cp), \
- .sz = sizeof(xtregs_ ## cp ## _t), \
- }
-
-static const struct {
- size_t elf_xtregs_offset;
- size_t ti_offset;
- size_t sz;
-} cp_offsets[] = {
- CP_OFFSETS(cp0),
- CP_OFFSETS(cp1),
- CP_OFFSETS(cp2),
- CP_OFFSETS(cp3),
- CP_OFFSETS(cp4),
- CP_OFFSETS(cp5),
- CP_OFFSETS(cp6),
- CP_OFFSETS(cp7),
-};
-#endif
static int ptrace_getxregs(struct task_struct *child, void __user *uregs)
{
- struct pt_regs *regs = task_pt_regs(child);
- struct thread_info *ti = task_thread_info(child);
- elf_xtregs_t __user *xtregs = uregs;
- int ret = 0;
- int i __maybe_unused;
-
- if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
- return -EIO;
-
-#if XTENSA_HAVE_COPROCESSORS
- /* Flush all coprocessor registers to memory. */
- coprocessor_flush_all(ti);
-
- for (i = 0; i < ARRAY_SIZE(cp_offsets); ++i)
- ret |= __copy_to_user((char __user *)xtregs +
- cp_offsets[i].elf_xtregs_offset,
- (const char *)ti +
- cp_offsets[i].ti_offset,
- cp_offsets[i].sz);
-#endif
- ret |= __copy_to_user(&xtregs->opt, ®s->xtregs_opt,
- sizeof(xtregs->opt));
- ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
- sizeof(xtregs->user));
-
- return ret ? -EFAULT : 0;
+ return copy_regset_to_user(child, &user_xtensa_view, REGSET_TIE,
+ 0, sizeof(elf_xtregs_t), uregs);
}
static int ptrace_setxregs(struct task_struct *child, void __user *uregs)
{
- struct thread_info *ti = task_thread_info(child);
- struct pt_regs *regs = task_pt_regs(child);
- elf_xtregs_t *xtregs = uregs;
- int ret = 0;
- int i __maybe_unused;
-
- if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
- return -EFAULT;
-
-#if XTENSA_HAVE_COPROCESSORS
- /* Flush all coprocessors before we overwrite them. */
- coprocessor_flush_all(ti);
- coprocessor_release_all(ti);
-
- for (i = 0; i < ARRAY_SIZE(cp_offsets); ++i)
- ret |= __copy_from_user((char *)ti + cp_offsets[i].ti_offset,
- (const char __user *)xtregs +
- cp_offsets[i].elf_xtregs_offset,
- cp_offsets[i].sz);
-#endif
- ret |= __copy_from_user(®s->xtregs_opt, &xtregs->opt,
- sizeof(xtregs->opt));
- ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
- sizeof(xtregs->user));
-
- return ret ? -EFAULT : 0;
+ return copy_regset_from_user(child, &user_xtensa_view, REGSET_TIE,
+ 0, sizeof(elf_xtregs_t), uregs);
}
static int ptrace_peekusr(struct task_struct *child, long regno,
@@ -447,18 +503,8 @@
void __user *datap = (void __user *) data;
switch (request) {
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
case PTRACE_PEEKUSR: /* read register specified by addr. */
ret = ptrace_peekusr(child, addr, datap);
- break;
-
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
break;
case PTRACE_POKEUSR: /* write register specified by addr. */
@@ -497,19 +543,43 @@
return ret;
}
-unsigned long do_syscall_trace_enter(struct pt_regs *regs)
+void do_syscall_trace_leave(struct pt_regs *regs);
+int do_syscall_trace_enter(struct pt_regs *regs)
{
- if (test_thread_flag(TIF_SYSCALL_TRACE) &&
- tracehook_report_syscall_entry(regs))
- return -1;
+ if (regs->syscall == NO_SYSCALL)
+ regs->areg[2] = -ENOSYS;
- return regs->areg[2];
+ if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+ tracehook_report_syscall_entry(regs)) {
+ regs->areg[2] = -ENOSYS;
+ regs->syscall = NO_SYSCALL;
+ return 0;
+ }
+
+ if (regs->syscall == NO_SYSCALL ||
+ secure_computing() == -1) {
+ do_syscall_trace_leave(regs);
+ return 0;
+ }
+
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_enter(regs, syscall_get_nr(current, regs));
+
+ audit_syscall_entry(regs->syscall, regs->areg[6],
+ regs->areg[3], regs->areg[4],
+ regs->areg[5]);
+ return 1;
}
void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
+ audit_syscall_exit(regs);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_exit(regs, regs_return_value(regs));
+
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
--
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