2 * linux/kernel/ptrace.c
4 * (C) Copyright 1999 Linus Torvalds
6 * Common interfaces for "ptrace()" which we do not want
7 * to continually duplicate across every architecture.
10 #include <linux/capability.h>
11 #include <linux/export.h>
12 #include <linux/sched.h>
13 #include <linux/errno.h>
15 #include <linux/highmem.h>
16 #include <linux/pagemap.h>
17 #include <linux/ptrace.h>
18 #include <linux/security.h>
19 #include <linux/signal.h>
20 #include <linux/audit.h>
21 #include <linux/pid_namespace.h>
22 #include <linux/syscalls.h>
23 #include <linux/uaccess.h>
24 #include <linux/regset.h>
25 #include <linux/hw_breakpoint.h>
26 #include <linux/cn_proc.h>
29 static int ptrace_trapping_sleep_fn(void *flags)
36 * ptrace a task: make the debugger its new parent and
37 * move it to the ptrace list.
39 * Must be called with the tasklist lock write-held.
41 void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
43 BUG_ON(!list_empty(&child->ptrace_entry));
44 list_add(&child->ptrace_entry, &new_parent->ptraced);
45 child->parent = new_parent;
49 * __ptrace_unlink - unlink ptracee and restore its execution state
50 * @child: ptracee to be unlinked
52 * Remove @child from the ptrace list, move it back to the original parent,
53 * and restore the execution state so that it conforms to the group stop
56 * Unlinking can happen via two paths - explicit PTRACE_DETACH or ptracer
57 * exiting. For PTRACE_DETACH, unless the ptracee has been killed between
58 * ptrace_check_attach() and here, it's guaranteed to be in TASK_TRACED.
59 * If the ptracer is exiting, the ptracee can be in any state.
61 * After detach, the ptracee should be in a state which conforms to the
62 * group stop. If the group is stopped or in the process of stopping, the
63 * ptracee should be put into TASK_STOPPED; otherwise, it should be woken
64 * up from TASK_TRACED.
66 * If the ptracee is in TASK_TRACED and needs to be moved to TASK_STOPPED,
67 * it goes through TRACED -> RUNNING -> STOPPED transition which is similar
68 * to but in the opposite direction of what happens while attaching to a
69 * stopped task. However, in this direction, the intermediate RUNNING
70 * state is not hidden even from the current ptracer and if it immediately
71 * re-attaches and performs a WNOHANG wait(2), it may fail.
74 * write_lock_irq(tasklist_lock)
76 void __ptrace_unlink(struct task_struct *child)
78 BUG_ON(!child->ptrace);
81 child->parent = child->real_parent;
82 list_del_init(&child->ptrace_entry);
84 spin_lock(&child->sighand->siglock);
87 * Clear all pending traps and TRAPPING. TRAPPING should be
88 * cleared regardless of JOBCTL_STOP_PENDING. Do it explicitly.
90 task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK);
91 task_clear_jobctl_trapping(child);
94 * Reinstate JOBCTL_STOP_PENDING if group stop is in effect and
97 if (!(child->flags & PF_EXITING) &&
98 (child->signal->flags & SIGNAL_STOP_STOPPED ||
99 child->signal->group_stop_count)) {
100 child->jobctl |= JOBCTL_STOP_PENDING;
103 * This is only possible if this thread was cloned by the
104 * traced task running in the stopped group, set the signal
105 * for the future reports.
106 * FIXME: we should change ptrace_init_task() to handle this
109 if (!(child->jobctl & JOBCTL_STOP_SIGMASK))
110 child->jobctl |= SIGSTOP;
114 * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick
115 * @child in the butt. Note that @resume should be used iff @child
116 * is in TASK_TRACED; otherwise, we might unduly disrupt
117 * TASK_KILLABLE sleeps.
119 if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child))
120 signal_wake_up(child, task_is_traced(child));
122 spin_unlock(&child->sighand->siglock);
126 * ptrace_check_attach - check whether ptracee is ready for ptrace operation
127 * @child: ptracee to check for
128 * @ignore_state: don't check whether @child is currently %TASK_TRACED
130 * Check whether @child is being ptraced by %current and ready for further
131 * ptrace operations. If @ignore_state is %false, @child also should be in
132 * %TASK_TRACED state and on return the child is guaranteed to be traced
133 * and not executing. If @ignore_state is %true, @child can be in any
137 * Grabs and releases tasklist_lock and @child->sighand->siglock.
140 * 0 on success, -ESRCH if %child is not ready.
142 int ptrace_check_attach(struct task_struct *child, bool ignore_state)
147 * We take the read lock around doing both checks to close a
148 * possible race where someone else was tracing our child and
149 * detached between these two checks. After this locked check,
150 * we are sure that this is our traced child and that can only
151 * be changed by us so it's not changing right after this.
153 read_lock(&tasklist_lock);
154 if ((child->ptrace & PT_PTRACED) && child->parent == current) {
156 * child->sighand can't be NULL, release_task()
157 * does ptrace_unlink() before __exit_signal().
159 spin_lock_irq(&child->sighand->siglock);
160 WARN_ON_ONCE(task_is_stopped(child));
161 if (ignore_state || (task_is_traced(child) &&
162 !(child->jobctl & JOBCTL_LISTENING)))
164 spin_unlock_irq(&child->sighand->siglock);
166 read_unlock(&tasklist_lock);
168 if (!ret && !ignore_state)
169 ret = wait_task_inactive(child, TASK_TRACED) ? 0 : -ESRCH;
171 /* All systems go.. */
175 static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
177 if (mode & PTRACE_MODE_NOAUDIT)
178 return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE);
180 return has_ns_capability(current, ns, CAP_SYS_PTRACE);
183 int __ptrace_may_access(struct task_struct *task, unsigned int mode)
185 const struct cred *cred = current_cred(), *tcred;
187 /* May we inspect the given task?
188 * This check is used both for attaching with ptrace
189 * and for allowing access to sensitive information in /proc.
191 * ptrace_attach denies several cases that /proc allows
192 * because setting up the necessary parent/child relationship
193 * or halting the specified task is impossible.
196 /* Don't let security modules deny introspection */
200 tcred = __task_cred(task);
201 if (cred->user->user_ns == tcred->user->user_ns &&
202 (cred->uid == tcred->euid &&
203 cred->uid == tcred->suid &&
204 cred->uid == tcred->uid &&
205 cred->gid == tcred->egid &&
206 cred->gid == tcred->sgid &&
207 cred->gid == tcred->gid))
209 if (ptrace_has_cap(tcred->user->user_ns, mode))
217 dumpable = get_dumpable(task->mm);
218 if (!dumpable && !ptrace_has_cap(task_user_ns(task), mode))
221 return security_ptrace_access_check(task, mode);
224 bool ptrace_may_access(struct task_struct *task, unsigned int mode)
228 err = __ptrace_may_access(task, mode);
233 static int ptrace_attach(struct task_struct *task, long request,
237 bool seize = (request == PTRACE_SEIZE);
241 * SEIZE will enable new ptrace behaviors which will be implemented
242 * gradually. SEIZE_DEVEL bit is used to prevent applications
243 * expecting full SEIZE behaviors trapping on kernel commits which
244 * are still in the process of implementing them.
246 * Only test programs for new ptrace behaviors being implemented
247 * should set SEIZE_DEVEL. If unset, SEIZE will fail with -EIO.
249 * Once SEIZE behaviors are completely implemented, this flag
256 if (!(flags & PTRACE_SEIZE_DEVEL))
258 flags &= ~(unsigned long)PTRACE_SEIZE_DEVEL;
259 if (flags & ~(unsigned long)PTRACE_O_MASK)
261 flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);
269 if (unlikely(task->flags & PF_KTHREAD))
271 if (same_thread_group(task, current))
275 * Protect exec's credential calculations against our interference;
276 * SUID, SGID and LSM creds get determined differently
279 retval = -ERESTARTNOINTR;
280 if (mutex_lock_interruptible(&task->signal->cred_guard_mutex))
284 retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH);
289 write_lock_irq(&tasklist_lock);
291 if (unlikely(task->exit_state))
292 goto unlock_tasklist;
294 goto unlock_tasklist;
298 if (ns_capable(task_user_ns(task), CAP_SYS_PTRACE))
299 flags |= PT_PTRACE_CAP;
300 task->ptrace = flags;
302 __ptrace_link(task, current);
304 /* SEIZE doesn't trap tracee on attach */
306 send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
308 spin_lock(&task->sighand->siglock);
311 * If the task is already STOPPED, set JOBCTL_TRAP_STOP and
312 * TRAPPING, and kick it so that it transits to TRACED. TRAPPING
313 * will be cleared if the child completes the transition or any
314 * event which clears the group stop states happens. We'll wait
315 * for the transition to complete before returning from this
318 * This hides STOPPED -> RUNNING -> TRACED transition from the
319 * attaching thread but a different thread in the same group can
320 * still observe the transient RUNNING state. IOW, if another
321 * thread's WNOHANG wait(2) on the stopped tracee races against
322 * ATTACH, the wait(2) may fail due to the transient RUNNING.
324 * The following task_is_stopped() test is safe as both transitions
325 * in and out of STOPPED are protected by siglock.
327 if (task_is_stopped(task) &&
328 task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING))
329 signal_wake_up(task, 1);
331 spin_unlock(&task->sighand->siglock);
335 write_unlock_irq(&tasklist_lock);
337 mutex_unlock(&task->signal->cred_guard_mutex);
340 wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT,
341 ptrace_trapping_sleep_fn, TASK_UNINTERRUPTIBLE);
342 proc_ptrace_connector(task, PTRACE_ATTACH);
349 * ptrace_traceme -- helper for PTRACE_TRACEME
351 * Performs checks and sets PT_PTRACED.
352 * Should be used by all ptrace implementations for PTRACE_TRACEME.
354 static int ptrace_traceme(void)
358 write_lock_irq(&tasklist_lock);
359 /* Are we already being traced? */
360 if (!current->ptrace) {
361 ret = security_ptrace_traceme(current->parent);
363 * Check PF_EXITING to ensure ->real_parent has not passed
364 * exit_ptrace(). Otherwise we don't report the error but
365 * pretend ->real_parent untraces us right after return.
367 if (!ret && !(current->real_parent->flags & PF_EXITING)) {
368 current->ptrace = PT_PTRACED;
369 __ptrace_link(current, current->real_parent);
372 write_unlock_irq(&tasklist_lock);
378 * Called with irqs disabled, returns true if childs should reap themselves.
380 static int ignoring_children(struct sighand_struct *sigh)
383 spin_lock(&sigh->siglock);
384 ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) ||
385 (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT);
386 spin_unlock(&sigh->siglock);
391 * Called with tasklist_lock held for writing.
392 * Unlink a traced task, and clean it up if it was a traced zombie.
393 * Return true if it needs to be reaped with release_task().
394 * (We can't call release_task() here because we already hold tasklist_lock.)
396 * If it's a zombie, our attachedness prevented normal parent notification
397 * or self-reaping. Do notification now if it would have happened earlier.
398 * If it should reap itself, return true.
400 * If it's our own child, there is no notification to do. But if our normal
401 * children self-reap, then this child was prevented by ptrace and we must
402 * reap it now, in that case we must also wake up sub-threads sleeping in
405 static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
411 if (p->exit_state != EXIT_ZOMBIE)
414 dead = !thread_group_leader(p);
416 if (!dead && thread_group_empty(p)) {
417 if (!same_thread_group(p->real_parent, tracer))
418 dead = do_notify_parent(p, p->exit_signal);
419 else if (ignoring_children(tracer->sighand)) {
420 __wake_up_parent(p, tracer);
424 /* Mark it as in the process of being reaped. */
426 p->exit_state = EXIT_DEAD;
430 static int ptrace_detach(struct task_struct *child, unsigned int data)
434 if (!valid_signal(data))
437 /* Architecture-specific hardware disable .. */
438 ptrace_disable(child);
439 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
441 write_lock_irq(&tasklist_lock);
443 * This child can be already killed. Make sure de_thread() or
444 * our sub-thread doing do_wait() didn't do release_task() yet.
447 child->exit_code = data;
448 dead = __ptrace_detach(current, child);
450 write_unlock_irq(&tasklist_lock);
452 proc_ptrace_connector(child, PTRACE_DETACH);
460 * Detach all tasks we were using ptrace on. Called with tasklist held
461 * for writing, and returns with it held too. But note it can release
462 * and reacquire the lock.
464 void exit_ptrace(struct task_struct *tracer)
465 __releases(&tasklist_lock)
466 __acquires(&tasklist_lock)
468 struct task_struct *p, *n;
469 LIST_HEAD(ptrace_dead);
471 if (likely(list_empty(&tracer->ptraced)))
474 list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
475 if (__ptrace_detach(tracer, p))
476 list_add(&p->ptrace_entry, &ptrace_dead);
479 write_unlock_irq(&tasklist_lock);
480 BUG_ON(!list_empty(&tracer->ptraced));
482 list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) {
483 list_del_init(&p->ptrace_entry);
487 write_lock_irq(&tasklist_lock);
490 int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
496 int this_len, retval;
498 this_len = (len > sizeof(buf)) ? sizeof(buf) : len;
499 retval = access_process_vm(tsk, src, buf, this_len, 0);
505 if (copy_to_user(dst, buf, retval))
515 int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len)
521 int this_len, retval;
523 this_len = (len > sizeof(buf)) ? sizeof(buf) : len;
524 if (copy_from_user(buf, src, this_len))
526 retval = access_process_vm(tsk, dst, buf, this_len, 1);
540 static int ptrace_setoptions(struct task_struct *child, unsigned long data)
544 if (data & ~(unsigned long)PTRACE_O_MASK)
547 /* Avoid intermediate state when all opts are cleared */
548 flags = child->ptrace;
549 flags &= ~(PTRACE_O_MASK << PT_OPT_FLAG_SHIFT);
550 flags |= (data << PT_OPT_FLAG_SHIFT);
551 child->ptrace = flags;
556 static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
561 if (lock_task_sighand(child, &flags)) {
563 if (likely(child->last_siginfo != NULL)) {
564 *info = *child->last_siginfo;
567 unlock_task_sighand(child, &flags);
572 static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
577 if (lock_task_sighand(child, &flags)) {
579 if (likely(child->last_siginfo != NULL)) {
580 *child->last_siginfo = *info;
583 unlock_task_sighand(child, &flags);
589 #ifdef PTRACE_SINGLESTEP
590 #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
592 #define is_singlestep(request) 0
595 #ifdef PTRACE_SINGLEBLOCK
596 #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK)
598 #define is_singleblock(request) 0
602 #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP)
604 #define is_sysemu_singlestep(request) 0
607 static int ptrace_resume(struct task_struct *child, long request,
610 if (!valid_signal(data))
613 if (request == PTRACE_SYSCALL)
614 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
616 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
618 #ifdef TIF_SYSCALL_EMU
619 if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP)
620 set_tsk_thread_flag(child, TIF_SYSCALL_EMU);
622 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
625 if (is_singleblock(request)) {
626 if (unlikely(!arch_has_block_step()))
628 user_enable_block_step(child);
629 } else if (is_singlestep(request) || is_sysemu_singlestep(request)) {
630 if (unlikely(!arch_has_single_step()))
632 user_enable_single_step(child);
634 user_disable_single_step(child);
637 child->exit_code = data;
638 wake_up_state(child, __TASK_TRACED);
643 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
645 static const struct user_regset *
646 find_regset(const struct user_regset_view *view, unsigned int type)
648 const struct user_regset *regset;
651 for (n = 0; n < view->n; ++n) {
652 regset = view->regsets + n;
653 if (regset->core_note_type == type)
660 static int ptrace_regset(struct task_struct *task, int req, unsigned int type,
663 const struct user_regset_view *view = task_user_regset_view(task);
664 const struct user_regset *regset = find_regset(view, type);
667 if (!regset || (kiov->iov_len % regset->size) != 0)
670 regset_no = regset - view->regsets;
671 kiov->iov_len = min(kiov->iov_len,
672 (__kernel_size_t) (regset->n * regset->size));
674 if (req == PTRACE_GETREGSET)
675 return copy_regset_to_user(task, view, regset_no, 0,
676 kiov->iov_len, kiov->iov_base);
678 return copy_regset_from_user(task, view, regset_no, 0,
679 kiov->iov_len, kiov->iov_base);
684 int ptrace_request(struct task_struct *child, long request,
685 unsigned long addr, unsigned long data)
687 bool seized = child->ptrace & PT_SEIZED;
689 siginfo_t siginfo, *si;
690 void __user *datavp = (void __user *) data;
691 unsigned long __user *datalp = datavp;
695 case PTRACE_PEEKTEXT:
696 case PTRACE_PEEKDATA:
697 return generic_ptrace_peekdata(child, addr, data);
698 case PTRACE_POKETEXT:
699 case PTRACE_POKEDATA:
700 return generic_ptrace_pokedata(child, addr, data);
702 #ifdef PTRACE_OLDSETOPTIONS
703 case PTRACE_OLDSETOPTIONS:
705 case PTRACE_SETOPTIONS:
706 ret = ptrace_setoptions(child, data);
708 case PTRACE_GETEVENTMSG:
709 ret = put_user(child->ptrace_message, datalp);
712 case PTRACE_GETSIGINFO:
713 ret = ptrace_getsiginfo(child, &siginfo);
715 ret = copy_siginfo_to_user(datavp, &siginfo);
718 case PTRACE_SETSIGINFO:
719 if (copy_from_user(&siginfo, datavp, sizeof siginfo))
722 ret = ptrace_setsiginfo(child, &siginfo);
725 case PTRACE_INTERRUPT:
727 * Stop tracee without any side-effect on signal or job
728 * control. At least one trap is guaranteed to happen
729 * after this request. If @child is already trapped, the
730 * current trap is not disturbed and another trap will
731 * happen after the current trap is ended with PTRACE_CONT.
733 * The actual trap might not be PTRACE_EVENT_STOP trap but
734 * the pending condition is cleared regardless.
736 if (unlikely(!seized || !lock_task_sighand(child, &flags)))
740 * INTERRUPT doesn't disturb existing trap sans one
741 * exception. If ptracer issued LISTEN for the current
742 * STOP, this INTERRUPT should clear LISTEN and re-trap
745 if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP)))
746 signal_wake_up(child, child->jobctl & JOBCTL_LISTENING);
748 unlock_task_sighand(child, &flags);
754 * Listen for events. Tracee must be in STOP. It's not
755 * resumed per-se but is not considered to be in TRACED by
756 * wait(2) or ptrace(2). If an async event (e.g. group
757 * stop state change) happens, tracee will enter STOP trap
758 * again. Alternatively, ptracer can issue INTERRUPT to
759 * finish listening and re-trap tracee into STOP.
761 if (unlikely(!seized || !lock_task_sighand(child, &flags)))
764 si = child->last_siginfo;
765 if (likely(si && (si->si_code >> 8) == PTRACE_EVENT_STOP)) {
766 child->jobctl |= JOBCTL_LISTENING;
768 * If NOTIFY is set, it means event happened between
769 * start of this trap and now. Trigger re-trap.
771 if (child->jobctl & JOBCTL_TRAP_NOTIFY)
772 signal_wake_up(child, true);
775 unlock_task_sighand(child, &flags);
778 case PTRACE_DETACH: /* detach a process that was attached. */
779 ret = ptrace_detach(child, data);
782 #ifdef CONFIG_BINFMT_ELF_FDPIC
783 case PTRACE_GETFDPIC: {
784 struct mm_struct *mm = get_task_mm(child);
785 unsigned long tmp = 0;
792 case PTRACE_GETFDPIC_EXEC:
793 tmp = mm->context.exec_fdpic_loadmap;
795 case PTRACE_GETFDPIC_INTERP:
796 tmp = mm->context.interp_fdpic_loadmap;
803 ret = put_user(tmp, datalp);
808 #ifdef PTRACE_SINGLESTEP
809 case PTRACE_SINGLESTEP:
811 #ifdef PTRACE_SINGLEBLOCK
812 case PTRACE_SINGLEBLOCK:
816 case PTRACE_SYSEMU_SINGLESTEP:
820 return ptrace_resume(child, request, data);
823 if (child->exit_state) /* already dead */
825 return ptrace_resume(child, request, SIGKILL);
827 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
828 case PTRACE_GETREGSET:
829 case PTRACE_SETREGSET:
832 struct iovec __user *uiov = datavp;
834 if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
837 if (__get_user(kiov.iov_base, &uiov->iov_base) ||
838 __get_user(kiov.iov_len, &uiov->iov_len))
841 ret = ptrace_regset(child, request, addr, &kiov);
843 ret = __put_user(kiov.iov_len, &uiov->iov_len);
854 static struct task_struct *ptrace_get_task_struct(pid_t pid)
856 struct task_struct *child;
859 child = find_task_by_vpid(pid);
861 get_task_struct(child);
865 return ERR_PTR(-ESRCH);
869 #ifndef arch_ptrace_attach
870 #define arch_ptrace_attach(child) do { } while (0)
873 SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
876 struct task_struct *child;
879 if (request == PTRACE_TRACEME) {
880 ret = ptrace_traceme();
882 arch_ptrace_attach(current);
886 child = ptrace_get_task_struct(pid);
888 ret = PTR_ERR(child);
892 if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
893 ret = ptrace_attach(child, request, addr, data);
895 * Some architectures need to do book-keeping after
899 arch_ptrace_attach(child);
900 goto out_put_task_struct;
903 ret = ptrace_check_attach(child, request == PTRACE_KILL ||
904 request == PTRACE_INTERRUPT);
906 goto out_put_task_struct;
908 ret = arch_ptrace(child, request, addr, data);
911 put_task_struct(child);
916 int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr,
922 copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0);
923 if (copied != sizeof(tmp))
925 return put_user(tmp, (unsigned long __user *)data);
928 int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
933 copied = access_process_vm(tsk, addr, &data, sizeof(data), 1);
934 return (copied == sizeof(data)) ? 0 : -EIO;
937 #if defined CONFIG_COMPAT
938 #include <linux/compat.h>
940 int compat_ptrace_request(struct task_struct *child, compat_long_t request,
941 compat_ulong_t addr, compat_ulong_t data)
943 compat_ulong_t __user *datap = compat_ptr(data);
949 case PTRACE_PEEKTEXT:
950 case PTRACE_PEEKDATA:
951 ret = access_process_vm(child, addr, &word, sizeof(word), 0);
952 if (ret != sizeof(word))
955 ret = put_user(word, datap);
958 case PTRACE_POKETEXT:
959 case PTRACE_POKEDATA:
960 ret = access_process_vm(child, addr, &data, sizeof(data), 1);
961 ret = (ret != sizeof(data) ? -EIO : 0);
964 case PTRACE_GETEVENTMSG:
965 ret = put_user((compat_ulong_t) child->ptrace_message, datap);
968 case PTRACE_GETSIGINFO:
969 ret = ptrace_getsiginfo(child, &siginfo);
971 ret = copy_siginfo_to_user32(
972 (struct compat_siginfo __user *) datap,
976 case PTRACE_SETSIGINFO:
977 memset(&siginfo, 0, sizeof siginfo);
978 if (copy_siginfo_from_user32(
979 &siginfo, (struct compat_siginfo __user *) datap))
982 ret = ptrace_setsiginfo(child, &siginfo);
984 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
985 case PTRACE_GETREGSET:
986 case PTRACE_SETREGSET:
989 struct compat_iovec __user *uiov =
990 (struct compat_iovec __user *) datap;
994 if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
997 if (__get_user(ptr, &uiov->iov_base) ||
998 __get_user(len, &uiov->iov_len))
1001 kiov.iov_base = compat_ptr(ptr);
1004 ret = ptrace_regset(child, request, addr, &kiov);
1006 ret = __put_user(kiov.iov_len, &uiov->iov_len);
1012 ret = ptrace_request(child, request, addr, data);
1018 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
1019 compat_long_t addr, compat_long_t data)
1021 struct task_struct *child;
1024 if (request == PTRACE_TRACEME) {
1025 ret = ptrace_traceme();
1029 child = ptrace_get_task_struct(pid);
1030 if (IS_ERR(child)) {
1031 ret = PTR_ERR(child);
1035 if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
1036 ret = ptrace_attach(child, request, addr, data);
1038 * Some architectures need to do book-keeping after
1042 arch_ptrace_attach(child);
1043 goto out_put_task_struct;
1046 ret = ptrace_check_attach(child, request == PTRACE_KILL ||
1047 request == PTRACE_INTERRUPT);
1049 ret = compat_arch_ptrace(child, request, addr, data);
1051 out_put_task_struct:
1052 put_task_struct(child);
1056 #endif /* CONFIG_COMPAT */
1058 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1059 int ptrace_get_breakpoints(struct task_struct *tsk)
1061 if (atomic_inc_not_zero(&tsk->ptrace_bp_refcnt))
1067 void ptrace_put_breakpoints(struct task_struct *tsk)
1069 if (atomic_dec_and_test(&tsk->ptrace_bp_refcnt))
1070 flush_ptrace_hw_breakpoint(tsk);
1072 #endif /* CONFIG_HAVE_HW_BREAKPOINT */