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/module.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>
28 static int ptrace_trapping_sleep_fn(void *flags
)
35 * ptrace a task: make the debugger its new parent and
36 * move it to the ptrace list.
38 * Must be called with the tasklist lock write-held.
40 void __ptrace_link(struct task_struct
*child
, struct task_struct
*new_parent
)
42 BUG_ON(!list_empty(&child
->ptrace_entry
));
43 list_add(&child
->ptrace_entry
, &new_parent
->ptraced
);
44 child
->parent
= new_parent
;
48 * __ptrace_unlink - unlink ptracee and restore its execution state
49 * @child: ptracee to be unlinked
51 * Remove @child from the ptrace list, move it back to the original parent,
52 * and restore the execution state so that it conforms to the group stop
55 * Unlinking can happen via two paths - explicit PTRACE_DETACH or ptracer
56 * exiting. For PTRACE_DETACH, unless the ptracee has been killed between
57 * ptrace_check_attach() and here, it's guaranteed to be in TASK_TRACED.
58 * If the ptracer is exiting, the ptracee can be in any state.
60 * After detach, the ptracee should be in a state which conforms to the
61 * group stop. If the group is stopped or in the process of stopping, the
62 * ptracee should be put into TASK_STOPPED; otherwise, it should be woken
63 * up from TASK_TRACED.
65 * If the ptracee is in TASK_TRACED and needs to be moved to TASK_STOPPED,
66 * it goes through TRACED -> RUNNING -> STOPPED transition which is similar
67 * to but in the opposite direction of what happens while attaching to a
68 * stopped task. However, in this direction, the intermediate RUNNING
69 * state is not hidden even from the current ptracer and if it immediately
70 * re-attaches and performs a WNOHANG wait(2), it may fail.
73 * write_lock_irq(tasklist_lock)
75 void __ptrace_unlink(struct task_struct
*child
)
77 BUG_ON(!child
->ptrace
);
80 child
->parent
= child
->real_parent
;
81 list_del_init(&child
->ptrace_entry
);
83 spin_lock(&child
->sighand
->siglock
);
86 * Reinstate JOBCTL_STOP_PENDING if group stop is in effect and
89 if (!(child
->flags
& PF_EXITING
) &&
90 (child
->signal
->flags
& SIGNAL_STOP_STOPPED
||
91 child
->signal
->group_stop_count
))
92 child
->jobctl
|= JOBCTL_STOP_PENDING
;
95 * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick
96 * @child in the butt. Note that @resume should be used iff @child
97 * is in TASK_TRACED; otherwise, we might unduly disrupt
98 * TASK_KILLABLE sleeps.
100 if (child
->jobctl
& JOBCTL_STOP_PENDING
|| task_is_traced(child
))
101 signal_wake_up(child
, task_is_traced(child
));
103 spin_unlock(&child
->sighand
->siglock
);
107 * ptrace_check_attach - check whether ptracee is ready for ptrace operation
108 * @child: ptracee to check for
109 * @ignore_state: don't check whether @child is currently %TASK_TRACED
111 * Check whether @child is being ptraced by %current and ready for further
112 * ptrace operations. If @ignore_state is %false, @child also should be in
113 * %TASK_TRACED state and on return the child is guaranteed to be traced
114 * and not executing. If @ignore_state is %true, @child can be in any
118 * Grabs and releases tasklist_lock and @child->sighand->siglock.
121 * 0 on success, -ESRCH if %child is not ready.
123 int ptrace_check_attach(struct task_struct
*child
, bool ignore_state
)
128 * We take the read lock around doing both checks to close a
129 * possible race where someone else was tracing our child and
130 * detached between these two checks. After this locked check,
131 * we are sure that this is our traced child and that can only
132 * be changed by us so it's not changing right after this.
134 read_lock(&tasklist_lock
);
135 if ((child
->ptrace
& PT_PTRACED
) && child
->parent
== current
) {
137 * child->sighand can't be NULL, release_task()
138 * does ptrace_unlink() before __exit_signal().
140 spin_lock_irq(&child
->sighand
->siglock
);
141 WARN_ON_ONCE(task_is_stopped(child
));
142 if (task_is_traced(child
) || ignore_state
)
144 spin_unlock_irq(&child
->sighand
->siglock
);
146 read_unlock(&tasklist_lock
);
148 if (!ret
&& !ignore_state
)
149 ret
= wait_task_inactive(child
, TASK_TRACED
) ? 0 : -ESRCH
;
151 /* All systems go.. */
155 int __ptrace_may_access(struct task_struct
*task
, unsigned int mode
)
157 const struct cred
*cred
= current_cred(), *tcred
;
159 /* May we inspect the given task?
160 * This check is used both for attaching with ptrace
161 * and for allowing access to sensitive information in /proc.
163 * ptrace_attach denies several cases that /proc allows
164 * because setting up the necessary parent/child relationship
165 * or halting the specified task is impossible.
168 /* Don't let security modules deny introspection */
172 tcred
= __task_cred(task
);
173 if (cred
->user
->user_ns
== tcred
->user
->user_ns
&&
174 (cred
->uid
== tcred
->euid
&&
175 cred
->uid
== tcred
->suid
&&
176 cred
->uid
== tcred
->uid
&&
177 cred
->gid
== tcred
->egid
&&
178 cred
->gid
== tcred
->sgid
&&
179 cred
->gid
== tcred
->gid
))
181 if (ns_capable(tcred
->user
->user_ns
, CAP_SYS_PTRACE
))
189 dumpable
= get_dumpable(task
->mm
);
190 if (!dumpable
&& !task_ns_capable(task
, CAP_SYS_PTRACE
))
193 return security_ptrace_access_check(task
, mode
);
196 bool ptrace_may_access(struct task_struct
*task
, unsigned int mode
)
200 err
= __ptrace_may_access(task
, mode
);
205 static int ptrace_attach(struct task_struct
*task
)
212 if (unlikely(task
->flags
& PF_KTHREAD
))
214 if (same_thread_group(task
, current
))
218 * Protect exec's credential calculations against our interference;
219 * interference; SUID, SGID and LSM creds get determined differently
222 retval
= -ERESTARTNOINTR
;
223 if (mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
))
227 retval
= __ptrace_may_access(task
, PTRACE_MODE_ATTACH
);
232 write_lock_irq(&tasklist_lock
);
234 if (unlikely(task
->exit_state
))
235 goto unlock_tasklist
;
237 goto unlock_tasklist
;
239 task
->ptrace
= PT_PTRACED
;
240 if (task_ns_capable(task
, CAP_SYS_PTRACE
))
241 task
->ptrace
|= PT_PTRACE_CAP
;
243 __ptrace_link(task
, current
);
244 send_sig_info(SIGSTOP
, SEND_SIG_FORCED
, task
);
246 spin_lock(&task
->sighand
->siglock
);
249 * If the task is already STOPPED, set JOBCTL_STOP_PENDING and
250 * TRAPPING, and kick it so that it transits to TRACED. TRAPPING
251 * will be cleared if the child completes the transition or any
252 * event which clears the group stop states happens. We'll wait
253 * for the transition to complete before returning from this
256 * This hides STOPPED -> RUNNING -> TRACED transition from the
257 * attaching thread but a different thread in the same group can
258 * still observe the transient RUNNING state. IOW, if another
259 * thread's WNOHANG wait(2) on the stopped tracee races against
260 * ATTACH, the wait(2) may fail due to the transient RUNNING.
262 * The following task_is_stopped() test is safe as both transitions
263 * in and out of STOPPED are protected by siglock.
265 if (task_is_stopped(task
) &&
266 task_set_jobctl_pending(task
,
267 JOBCTL_STOP_PENDING
| JOBCTL_TRAPPING
))
268 signal_wake_up(task
, 1);
270 spin_unlock(&task
->sighand
->siglock
);
274 write_unlock_irq(&tasklist_lock
);
276 mutex_unlock(&task
->signal
->cred_guard_mutex
);
279 wait_on_bit(&task
->jobctl
, JOBCTL_TRAPPING_BIT
,
280 ptrace_trapping_sleep_fn
, TASK_UNINTERRUPTIBLE
);
285 * ptrace_traceme -- helper for PTRACE_TRACEME
287 * Performs checks and sets PT_PTRACED.
288 * Should be used by all ptrace implementations for PTRACE_TRACEME.
290 static int ptrace_traceme(void)
294 write_lock_irq(&tasklist_lock
);
295 /* Are we already being traced? */
296 if (!current
->ptrace
) {
297 ret
= security_ptrace_traceme(current
->parent
);
299 * Check PF_EXITING to ensure ->real_parent has not passed
300 * exit_ptrace(). Otherwise we don't report the error but
301 * pretend ->real_parent untraces us right after return.
303 if (!ret
&& !(current
->real_parent
->flags
& PF_EXITING
)) {
304 current
->ptrace
= PT_PTRACED
;
305 __ptrace_link(current
, current
->real_parent
);
308 write_unlock_irq(&tasklist_lock
);
314 * Called with irqs disabled, returns true if childs should reap themselves.
316 static int ignoring_children(struct sighand_struct
*sigh
)
319 spin_lock(&sigh
->siglock
);
320 ret
= (sigh
->action
[SIGCHLD
-1].sa
.sa_handler
== SIG_IGN
) ||
321 (sigh
->action
[SIGCHLD
-1].sa
.sa_flags
& SA_NOCLDWAIT
);
322 spin_unlock(&sigh
->siglock
);
327 * Called with tasklist_lock held for writing.
328 * Unlink a traced task, and clean it up if it was a traced zombie.
329 * Return true if it needs to be reaped with release_task().
330 * (We can't call release_task() here because we already hold tasklist_lock.)
332 * If it's a zombie, our attachedness prevented normal parent notification
333 * or self-reaping. Do notification now if it would have happened earlier.
334 * If it should reap itself, return true.
336 * If it's our own child, there is no notification to do. But if our normal
337 * children self-reap, then this child was prevented by ptrace and we must
338 * reap it now, in that case we must also wake up sub-threads sleeping in
341 static bool __ptrace_detach(struct task_struct
*tracer
, struct task_struct
*p
)
345 if (p
->exit_state
== EXIT_ZOMBIE
) {
346 if (!task_detached(p
) && thread_group_empty(p
)) {
347 if (!same_thread_group(p
->real_parent
, tracer
))
348 do_notify_parent(p
, p
->exit_signal
);
349 else if (ignoring_children(tracer
->sighand
)) {
350 __wake_up_parent(p
, tracer
);
354 if (task_detached(p
)) {
355 /* Mark it as in the process of being reaped. */
356 p
->exit_state
= EXIT_DEAD
;
364 static int ptrace_detach(struct task_struct
*child
, unsigned int data
)
368 if (!valid_signal(data
))
371 /* Architecture-specific hardware disable .. */
372 ptrace_disable(child
);
373 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
375 write_lock_irq(&tasklist_lock
);
377 * This child can be already killed. Make sure de_thread() or
378 * our sub-thread doing do_wait() didn't do release_task() yet.
381 child
->exit_code
= data
;
382 dead
= __ptrace_detach(current
, child
);
384 write_unlock_irq(&tasklist_lock
);
393 * Detach all tasks we were using ptrace on. Called with tasklist held
394 * for writing, and returns with it held too. But note it can release
395 * and reacquire the lock.
397 void exit_ptrace(struct task_struct
*tracer
)
398 __releases(&tasklist_lock
)
399 __acquires(&tasklist_lock
)
401 struct task_struct
*p
, *n
;
402 LIST_HEAD(ptrace_dead
);
404 if (likely(list_empty(&tracer
->ptraced
)))
407 list_for_each_entry_safe(p
, n
, &tracer
->ptraced
, ptrace_entry
) {
408 if (__ptrace_detach(tracer
, p
))
409 list_add(&p
->ptrace_entry
, &ptrace_dead
);
412 write_unlock_irq(&tasklist_lock
);
413 BUG_ON(!list_empty(&tracer
->ptraced
));
415 list_for_each_entry_safe(p
, n
, &ptrace_dead
, ptrace_entry
) {
416 list_del_init(&p
->ptrace_entry
);
420 write_lock_irq(&tasklist_lock
);
423 int ptrace_readdata(struct task_struct
*tsk
, unsigned long src
, char __user
*dst
, int len
)
429 int this_len
, retval
;
431 this_len
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
432 retval
= access_process_vm(tsk
, src
, buf
, this_len
, 0);
438 if (copy_to_user(dst
, buf
, retval
))
448 int ptrace_writedata(struct task_struct
*tsk
, char __user
*src
, unsigned long dst
, int len
)
454 int this_len
, retval
;
456 this_len
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
457 if (copy_from_user(buf
, src
, this_len
))
459 retval
= access_process_vm(tsk
, dst
, buf
, this_len
, 1);
473 static int ptrace_setoptions(struct task_struct
*child
, unsigned long data
)
475 child
->ptrace
&= ~PT_TRACE_MASK
;
477 if (data
& PTRACE_O_TRACESYSGOOD
)
478 child
->ptrace
|= PT_TRACESYSGOOD
;
480 if (data
& PTRACE_O_TRACEFORK
)
481 child
->ptrace
|= PT_TRACE_FORK
;
483 if (data
& PTRACE_O_TRACEVFORK
)
484 child
->ptrace
|= PT_TRACE_VFORK
;
486 if (data
& PTRACE_O_TRACECLONE
)
487 child
->ptrace
|= PT_TRACE_CLONE
;
489 if (data
& PTRACE_O_TRACEEXEC
)
490 child
->ptrace
|= PT_TRACE_EXEC
;
492 if (data
& PTRACE_O_TRACEVFORKDONE
)
493 child
->ptrace
|= PT_TRACE_VFORK_DONE
;
495 if (data
& PTRACE_O_TRACEEXIT
)
496 child
->ptrace
|= PT_TRACE_EXIT
;
498 return (data
& ~PTRACE_O_MASK
) ? -EINVAL
: 0;
501 static int ptrace_getsiginfo(struct task_struct
*child
, siginfo_t
*info
)
506 if (lock_task_sighand(child
, &flags
)) {
508 if (likely(child
->last_siginfo
!= NULL
)) {
509 *info
= *child
->last_siginfo
;
512 unlock_task_sighand(child
, &flags
);
517 static int ptrace_setsiginfo(struct task_struct
*child
, const siginfo_t
*info
)
522 if (lock_task_sighand(child
, &flags
)) {
524 if (likely(child
->last_siginfo
!= NULL
)) {
525 *child
->last_siginfo
= *info
;
528 unlock_task_sighand(child
, &flags
);
534 #ifdef PTRACE_SINGLESTEP
535 #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
537 #define is_singlestep(request) 0
540 #ifdef PTRACE_SINGLEBLOCK
541 #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK)
543 #define is_singleblock(request) 0
547 #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP)
549 #define is_sysemu_singlestep(request) 0
552 static int ptrace_resume(struct task_struct
*child
, long request
,
555 if (!valid_signal(data
))
558 if (request
== PTRACE_SYSCALL
)
559 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
561 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
563 #ifdef TIF_SYSCALL_EMU
564 if (request
== PTRACE_SYSEMU
|| request
== PTRACE_SYSEMU_SINGLESTEP
)
565 set_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
567 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
570 if (is_singleblock(request
)) {
571 if (unlikely(!arch_has_block_step()))
573 user_enable_block_step(child
);
574 } else if (is_singlestep(request
) || is_sysemu_singlestep(request
)) {
575 if (unlikely(!arch_has_single_step()))
577 user_enable_single_step(child
);
579 user_disable_single_step(child
);
582 child
->exit_code
= data
;
583 wake_up_state(child
, __TASK_TRACED
);
588 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
590 static const struct user_regset
*
591 find_regset(const struct user_regset_view
*view
, unsigned int type
)
593 const struct user_regset
*regset
;
596 for (n
= 0; n
< view
->n
; ++n
) {
597 regset
= view
->regsets
+ n
;
598 if (regset
->core_note_type
== type
)
605 static int ptrace_regset(struct task_struct
*task
, int req
, unsigned int type
,
608 const struct user_regset_view
*view
= task_user_regset_view(task
);
609 const struct user_regset
*regset
= find_regset(view
, type
);
612 if (!regset
|| (kiov
->iov_len
% regset
->size
) != 0)
615 regset_no
= regset
- view
->regsets
;
616 kiov
->iov_len
= min(kiov
->iov_len
,
617 (__kernel_size_t
) (regset
->n
* regset
->size
));
619 if (req
== PTRACE_GETREGSET
)
620 return copy_regset_to_user(task
, view
, regset_no
, 0,
621 kiov
->iov_len
, kiov
->iov_base
);
623 return copy_regset_from_user(task
, view
, regset_no
, 0,
624 kiov
->iov_len
, kiov
->iov_base
);
629 int ptrace_request(struct task_struct
*child
, long request
,
630 unsigned long addr
, unsigned long data
)
634 void __user
*datavp
= (void __user
*) data
;
635 unsigned long __user
*datalp
= datavp
;
638 case PTRACE_PEEKTEXT
:
639 case PTRACE_PEEKDATA
:
640 return generic_ptrace_peekdata(child
, addr
, data
);
641 case PTRACE_POKETEXT
:
642 case PTRACE_POKEDATA
:
643 return generic_ptrace_pokedata(child
, addr
, data
);
645 #ifdef PTRACE_OLDSETOPTIONS
646 case PTRACE_OLDSETOPTIONS
:
648 case PTRACE_SETOPTIONS
:
649 ret
= ptrace_setoptions(child
, data
);
651 case PTRACE_GETEVENTMSG
:
652 ret
= put_user(child
->ptrace_message
, datalp
);
655 case PTRACE_GETSIGINFO
:
656 ret
= ptrace_getsiginfo(child
, &siginfo
);
658 ret
= copy_siginfo_to_user(datavp
, &siginfo
);
661 case PTRACE_SETSIGINFO
:
662 if (copy_from_user(&siginfo
, datavp
, sizeof siginfo
))
665 ret
= ptrace_setsiginfo(child
, &siginfo
);
668 case PTRACE_DETACH
: /* detach a process that was attached. */
669 ret
= ptrace_detach(child
, data
);
672 #ifdef CONFIG_BINFMT_ELF_FDPIC
673 case PTRACE_GETFDPIC
: {
674 struct mm_struct
*mm
= get_task_mm(child
);
675 unsigned long tmp
= 0;
682 case PTRACE_GETFDPIC_EXEC
:
683 tmp
= mm
->context
.exec_fdpic_loadmap
;
685 case PTRACE_GETFDPIC_INTERP
:
686 tmp
= mm
->context
.interp_fdpic_loadmap
;
693 ret
= put_user(tmp
, datalp
);
698 #ifdef PTRACE_SINGLESTEP
699 case PTRACE_SINGLESTEP
:
701 #ifdef PTRACE_SINGLEBLOCK
702 case PTRACE_SINGLEBLOCK
:
706 case PTRACE_SYSEMU_SINGLESTEP
:
710 return ptrace_resume(child
, request
, data
);
713 if (child
->exit_state
) /* already dead */
715 return ptrace_resume(child
, request
, SIGKILL
);
717 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
718 case PTRACE_GETREGSET
:
719 case PTRACE_SETREGSET
:
722 struct iovec __user
*uiov
= datavp
;
724 if (!access_ok(VERIFY_WRITE
, uiov
, sizeof(*uiov
)))
727 if (__get_user(kiov
.iov_base
, &uiov
->iov_base
) ||
728 __get_user(kiov
.iov_len
, &uiov
->iov_len
))
731 ret
= ptrace_regset(child
, request
, addr
, &kiov
);
733 ret
= __put_user(kiov
.iov_len
, &uiov
->iov_len
);
744 static struct task_struct
*ptrace_get_task_struct(pid_t pid
)
746 struct task_struct
*child
;
749 child
= find_task_by_vpid(pid
);
751 get_task_struct(child
);
755 return ERR_PTR(-ESRCH
);
759 #ifndef arch_ptrace_attach
760 #define arch_ptrace_attach(child) do { } while (0)
763 SYSCALL_DEFINE4(ptrace
, long, request
, long, pid
, unsigned long, addr
,
766 struct task_struct
*child
;
769 if (request
== PTRACE_TRACEME
) {
770 ret
= ptrace_traceme();
772 arch_ptrace_attach(current
);
776 child
= ptrace_get_task_struct(pid
);
778 ret
= PTR_ERR(child
);
782 if (request
== PTRACE_ATTACH
) {
783 ret
= ptrace_attach(child
);
785 * Some architectures need to do book-keeping after
789 arch_ptrace_attach(child
);
790 goto out_put_task_struct
;
793 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
795 goto out_put_task_struct
;
797 ret
= arch_ptrace(child
, request
, addr
, data
);
800 put_task_struct(child
);
805 int generic_ptrace_peekdata(struct task_struct
*tsk
, unsigned long addr
,
811 copied
= access_process_vm(tsk
, addr
, &tmp
, sizeof(tmp
), 0);
812 if (copied
!= sizeof(tmp
))
814 return put_user(tmp
, (unsigned long __user
*)data
);
817 int generic_ptrace_pokedata(struct task_struct
*tsk
, unsigned long addr
,
822 copied
= access_process_vm(tsk
, addr
, &data
, sizeof(data
), 1);
823 return (copied
== sizeof(data
)) ? 0 : -EIO
;
826 #if defined CONFIG_COMPAT
827 #include <linux/compat.h>
829 int compat_ptrace_request(struct task_struct
*child
, compat_long_t request
,
830 compat_ulong_t addr
, compat_ulong_t data
)
832 compat_ulong_t __user
*datap
= compat_ptr(data
);
838 case PTRACE_PEEKTEXT
:
839 case PTRACE_PEEKDATA
:
840 ret
= access_process_vm(child
, addr
, &word
, sizeof(word
), 0);
841 if (ret
!= sizeof(word
))
844 ret
= put_user(word
, datap
);
847 case PTRACE_POKETEXT
:
848 case PTRACE_POKEDATA
:
849 ret
= access_process_vm(child
, addr
, &data
, sizeof(data
), 1);
850 ret
= (ret
!= sizeof(data
) ? -EIO
: 0);
853 case PTRACE_GETEVENTMSG
:
854 ret
= put_user((compat_ulong_t
) child
->ptrace_message
, datap
);
857 case PTRACE_GETSIGINFO
:
858 ret
= ptrace_getsiginfo(child
, &siginfo
);
860 ret
= copy_siginfo_to_user32(
861 (struct compat_siginfo __user
*) datap
,
865 case PTRACE_SETSIGINFO
:
866 memset(&siginfo
, 0, sizeof siginfo
);
867 if (copy_siginfo_from_user32(
868 &siginfo
, (struct compat_siginfo __user
*) datap
))
871 ret
= ptrace_setsiginfo(child
, &siginfo
);
873 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
874 case PTRACE_GETREGSET
:
875 case PTRACE_SETREGSET
:
878 struct compat_iovec __user
*uiov
=
879 (struct compat_iovec __user
*) datap
;
883 if (!access_ok(VERIFY_WRITE
, uiov
, sizeof(*uiov
)))
886 if (__get_user(ptr
, &uiov
->iov_base
) ||
887 __get_user(len
, &uiov
->iov_len
))
890 kiov
.iov_base
= compat_ptr(ptr
);
893 ret
= ptrace_regset(child
, request
, addr
, &kiov
);
895 ret
= __put_user(kiov
.iov_len
, &uiov
->iov_len
);
901 ret
= ptrace_request(child
, request
, addr
, data
);
907 asmlinkage
long compat_sys_ptrace(compat_long_t request
, compat_long_t pid
,
908 compat_long_t addr
, compat_long_t data
)
910 struct task_struct
*child
;
913 if (request
== PTRACE_TRACEME
) {
914 ret
= ptrace_traceme();
918 child
= ptrace_get_task_struct(pid
);
920 ret
= PTR_ERR(child
);
924 if (request
== PTRACE_ATTACH
) {
925 ret
= ptrace_attach(child
);
927 * Some architectures need to do book-keeping after
931 arch_ptrace_attach(child
);
932 goto out_put_task_struct
;
935 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
937 ret
= compat_arch_ptrace(child
, request
, addr
, data
);
940 put_task_struct(child
);
944 #endif /* CONFIG_COMPAT */
946 #ifdef CONFIG_HAVE_HW_BREAKPOINT
947 int ptrace_get_breakpoints(struct task_struct
*tsk
)
949 if (atomic_inc_not_zero(&tsk
->ptrace_bp_refcnt
))
955 void ptrace_put_breakpoints(struct task_struct
*tsk
)
957 if (atomic_dec_and_test(&tsk
->ptrace_bp_refcnt
))
958 flush_ptrace_hw_breakpoint(tsk
);
960 #endif /* CONFIG_HAVE_HW_BREAKPOINT */