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 * Clear all pending traps and TRAPPING. TRAPPING should be
87 * cleared regardless of JOBCTL_STOP_PENDING. Do it explicitly.
89 task_clear_jobctl_pending(child
, JOBCTL_TRAP_MASK
);
90 task_clear_jobctl_trapping(child
);
93 * Reinstate JOBCTL_STOP_PENDING if group stop is in effect and
96 if (!(child
->flags
& PF_EXITING
) &&
97 (child
->signal
->flags
& SIGNAL_STOP_STOPPED
||
98 child
->signal
->group_stop_count
))
99 child
->jobctl
|= JOBCTL_STOP_PENDING
;
102 * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick
103 * @child in the butt. Note that @resume should be used iff @child
104 * is in TASK_TRACED; otherwise, we might unduly disrupt
105 * TASK_KILLABLE sleeps.
107 if (child
->jobctl
& JOBCTL_STOP_PENDING
|| task_is_traced(child
))
108 signal_wake_up(child
, task_is_traced(child
));
110 spin_unlock(&child
->sighand
->siglock
);
114 * ptrace_check_attach - check whether ptracee is ready for ptrace operation
115 * @child: ptracee to check for
116 * @ignore_state: don't check whether @child is currently %TASK_TRACED
118 * Check whether @child is being ptraced by %current and ready for further
119 * ptrace operations. If @ignore_state is %false, @child also should be in
120 * %TASK_TRACED state and on return the child is guaranteed to be traced
121 * and not executing. If @ignore_state is %true, @child can be in any
125 * Grabs and releases tasklist_lock and @child->sighand->siglock.
128 * 0 on success, -ESRCH if %child is not ready.
130 int ptrace_check_attach(struct task_struct
*child
, bool ignore_state
)
135 * We take the read lock around doing both checks to close a
136 * possible race where someone else was tracing our child and
137 * detached between these two checks. After this locked check,
138 * we are sure that this is our traced child and that can only
139 * be changed by us so it's not changing right after this.
141 read_lock(&tasklist_lock
);
142 if ((child
->ptrace
& PT_PTRACED
) && child
->parent
== current
) {
144 * child->sighand can't be NULL, release_task()
145 * does ptrace_unlink() before __exit_signal().
147 spin_lock_irq(&child
->sighand
->siglock
);
148 WARN_ON_ONCE(task_is_stopped(child
));
149 if (task_is_traced(child
) || ignore_state
)
151 spin_unlock_irq(&child
->sighand
->siglock
);
153 read_unlock(&tasklist_lock
);
155 if (!ret
&& !ignore_state
)
156 ret
= wait_task_inactive(child
, TASK_TRACED
) ? 0 : -ESRCH
;
158 /* All systems go.. */
162 int __ptrace_may_access(struct task_struct
*task
, unsigned int mode
)
164 const struct cred
*cred
= current_cred(), *tcred
;
166 /* May we inspect the given task?
167 * This check is used both for attaching with ptrace
168 * and for allowing access to sensitive information in /proc.
170 * ptrace_attach denies several cases that /proc allows
171 * because setting up the necessary parent/child relationship
172 * or halting the specified task is impossible.
175 /* Don't let security modules deny introspection */
179 tcred
= __task_cred(task
);
180 if (cred
->user
->user_ns
== tcred
->user
->user_ns
&&
181 (cred
->uid
== tcred
->euid
&&
182 cred
->uid
== tcred
->suid
&&
183 cred
->uid
== tcred
->uid
&&
184 cred
->gid
== tcred
->egid
&&
185 cred
->gid
== tcred
->sgid
&&
186 cred
->gid
== tcred
->gid
))
188 if (ns_capable(tcred
->user
->user_ns
, CAP_SYS_PTRACE
))
196 dumpable
= get_dumpable(task
->mm
);
197 if (!dumpable
&& !task_ns_capable(task
, CAP_SYS_PTRACE
))
200 return security_ptrace_access_check(task
, mode
);
203 bool ptrace_may_access(struct task_struct
*task
, unsigned int mode
)
207 err
= __ptrace_may_access(task
, mode
);
212 static int ptrace_attach(struct task_struct
*task
, long request
,
215 bool seize
= (request
== PTRACE_SEIZE
);
219 * SEIZE will enable new ptrace behaviors which will be implemented
220 * gradually. SEIZE_DEVEL is used to prevent applications
221 * expecting full SEIZE behaviors trapping on kernel commits which
222 * are still in the process of implementing them.
224 * Only test programs for new ptrace behaviors being implemented
225 * should set SEIZE_DEVEL. If unset, SEIZE will fail with -EIO.
227 * Once SEIZE behaviors are completely implemented, this flag and
228 * the following test will be removed.
231 if (seize
&& !(flags
& PTRACE_SEIZE_DEVEL
))
237 if (unlikely(task
->flags
& PF_KTHREAD
))
239 if (same_thread_group(task
, current
))
243 * Protect exec's credential calculations against our interference;
244 * interference; SUID, SGID and LSM creds get determined differently
247 retval
= -ERESTARTNOINTR
;
248 if (mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
))
252 retval
= __ptrace_may_access(task
, PTRACE_MODE_ATTACH
);
257 write_lock_irq(&tasklist_lock
);
259 if (unlikely(task
->exit_state
))
260 goto unlock_tasklist
;
262 goto unlock_tasklist
;
264 task
->ptrace
= PT_PTRACED
;
266 task
->ptrace
|= PT_SEIZED
;
267 if (task_ns_capable(task
, CAP_SYS_PTRACE
))
268 task
->ptrace
|= PT_PTRACE_CAP
;
270 __ptrace_link(task
, current
);
272 /* SEIZE doesn't trap tracee on attach */
274 send_sig_info(SIGSTOP
, SEND_SIG_FORCED
, task
);
276 spin_lock(&task
->sighand
->siglock
);
279 * If the task is already STOPPED, set JOBCTL_TRAP_STOP and
280 * TRAPPING, and kick it so that it transits to TRACED. TRAPPING
281 * will be cleared if the child completes the transition or any
282 * event which clears the group stop states happens. We'll wait
283 * for the transition to complete before returning from this
286 * This hides STOPPED -> RUNNING -> TRACED transition from the
287 * attaching thread but a different thread in the same group can
288 * still observe the transient RUNNING state. IOW, if another
289 * thread's WNOHANG wait(2) on the stopped tracee races against
290 * ATTACH, the wait(2) may fail due to the transient RUNNING.
292 * The following task_is_stopped() test is safe as both transitions
293 * in and out of STOPPED are protected by siglock.
295 if (task_is_stopped(task
) &&
296 task_set_jobctl_pending(task
, JOBCTL_TRAP_STOP
| JOBCTL_TRAPPING
))
297 signal_wake_up(task
, 1);
299 spin_unlock(&task
->sighand
->siglock
);
303 write_unlock_irq(&tasklist_lock
);
305 mutex_unlock(&task
->signal
->cred_guard_mutex
);
308 wait_on_bit(&task
->jobctl
, JOBCTL_TRAPPING_BIT
,
309 ptrace_trapping_sleep_fn
, TASK_UNINTERRUPTIBLE
);
314 * ptrace_traceme -- helper for PTRACE_TRACEME
316 * Performs checks and sets PT_PTRACED.
317 * Should be used by all ptrace implementations for PTRACE_TRACEME.
319 static int ptrace_traceme(void)
323 write_lock_irq(&tasklist_lock
);
324 /* Are we already being traced? */
325 if (!current
->ptrace
) {
326 ret
= security_ptrace_traceme(current
->parent
);
328 * Check PF_EXITING to ensure ->real_parent has not passed
329 * exit_ptrace(). Otherwise we don't report the error but
330 * pretend ->real_parent untraces us right after return.
332 if (!ret
&& !(current
->real_parent
->flags
& PF_EXITING
)) {
333 current
->ptrace
= PT_PTRACED
;
334 __ptrace_link(current
, current
->real_parent
);
337 write_unlock_irq(&tasklist_lock
);
343 * Called with irqs disabled, returns true if childs should reap themselves.
345 static int ignoring_children(struct sighand_struct
*sigh
)
348 spin_lock(&sigh
->siglock
);
349 ret
= (sigh
->action
[SIGCHLD
-1].sa
.sa_handler
== SIG_IGN
) ||
350 (sigh
->action
[SIGCHLD
-1].sa
.sa_flags
& SA_NOCLDWAIT
);
351 spin_unlock(&sigh
->siglock
);
356 * Called with tasklist_lock held for writing.
357 * Unlink a traced task, and clean it up if it was a traced zombie.
358 * Return true if it needs to be reaped with release_task().
359 * (We can't call release_task() here because we already hold tasklist_lock.)
361 * If it's a zombie, our attachedness prevented normal parent notification
362 * or self-reaping. Do notification now if it would have happened earlier.
363 * If it should reap itself, return true.
365 * If it's our own child, there is no notification to do. But if our normal
366 * children self-reap, then this child was prevented by ptrace and we must
367 * reap it now, in that case we must also wake up sub-threads sleeping in
370 static bool __ptrace_detach(struct task_struct
*tracer
, struct task_struct
*p
)
374 if (p
->exit_state
== EXIT_ZOMBIE
) {
375 if (!task_detached(p
) && thread_group_empty(p
)) {
376 if (!same_thread_group(p
->real_parent
, tracer
))
377 do_notify_parent(p
, p
->exit_signal
);
378 else if (ignoring_children(tracer
->sighand
)) {
379 __wake_up_parent(p
, tracer
);
383 if (task_detached(p
)) {
384 /* Mark it as in the process of being reaped. */
385 p
->exit_state
= EXIT_DEAD
;
393 static int ptrace_detach(struct task_struct
*child
, unsigned int data
)
397 if (!valid_signal(data
))
400 /* Architecture-specific hardware disable .. */
401 ptrace_disable(child
);
402 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
404 write_lock_irq(&tasklist_lock
);
406 * This child can be already killed. Make sure de_thread() or
407 * our sub-thread doing do_wait() didn't do release_task() yet.
410 child
->exit_code
= data
;
411 dead
= __ptrace_detach(current
, child
);
413 write_unlock_irq(&tasklist_lock
);
422 * Detach all tasks we were using ptrace on. Called with tasklist held
423 * for writing, and returns with it held too. But note it can release
424 * and reacquire the lock.
426 void exit_ptrace(struct task_struct
*tracer
)
427 __releases(&tasklist_lock
)
428 __acquires(&tasklist_lock
)
430 struct task_struct
*p
, *n
;
431 LIST_HEAD(ptrace_dead
);
433 if (likely(list_empty(&tracer
->ptraced
)))
436 list_for_each_entry_safe(p
, n
, &tracer
->ptraced
, ptrace_entry
) {
437 if (__ptrace_detach(tracer
, p
))
438 list_add(&p
->ptrace_entry
, &ptrace_dead
);
441 write_unlock_irq(&tasklist_lock
);
442 BUG_ON(!list_empty(&tracer
->ptraced
));
444 list_for_each_entry_safe(p
, n
, &ptrace_dead
, ptrace_entry
) {
445 list_del_init(&p
->ptrace_entry
);
449 write_lock_irq(&tasklist_lock
);
452 int ptrace_readdata(struct task_struct
*tsk
, unsigned long src
, char __user
*dst
, int len
)
458 int this_len
, retval
;
460 this_len
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
461 retval
= access_process_vm(tsk
, src
, buf
, this_len
, 0);
467 if (copy_to_user(dst
, buf
, retval
))
477 int ptrace_writedata(struct task_struct
*tsk
, char __user
*src
, unsigned long dst
, int len
)
483 int this_len
, retval
;
485 this_len
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
486 if (copy_from_user(buf
, src
, this_len
))
488 retval
= access_process_vm(tsk
, dst
, buf
, this_len
, 1);
502 static int ptrace_setoptions(struct task_struct
*child
, unsigned long data
)
504 child
->ptrace
&= ~PT_TRACE_MASK
;
506 if (data
& PTRACE_O_TRACESYSGOOD
)
507 child
->ptrace
|= PT_TRACESYSGOOD
;
509 if (data
& PTRACE_O_TRACEFORK
)
510 child
->ptrace
|= PT_TRACE_FORK
;
512 if (data
& PTRACE_O_TRACEVFORK
)
513 child
->ptrace
|= PT_TRACE_VFORK
;
515 if (data
& PTRACE_O_TRACECLONE
)
516 child
->ptrace
|= PT_TRACE_CLONE
;
518 if (data
& PTRACE_O_TRACEEXEC
)
519 child
->ptrace
|= PT_TRACE_EXEC
;
521 if (data
& PTRACE_O_TRACEVFORKDONE
)
522 child
->ptrace
|= PT_TRACE_VFORK_DONE
;
524 if (data
& PTRACE_O_TRACEEXIT
)
525 child
->ptrace
|= PT_TRACE_EXIT
;
527 return (data
& ~PTRACE_O_MASK
) ? -EINVAL
: 0;
530 static int ptrace_getsiginfo(struct task_struct
*child
, siginfo_t
*info
)
535 if (lock_task_sighand(child
, &flags
)) {
537 if (likely(child
->last_siginfo
!= NULL
)) {
538 *info
= *child
->last_siginfo
;
541 unlock_task_sighand(child
, &flags
);
546 static int ptrace_setsiginfo(struct task_struct
*child
, const siginfo_t
*info
)
551 if (lock_task_sighand(child
, &flags
)) {
553 if (likely(child
->last_siginfo
!= NULL
)) {
554 *child
->last_siginfo
= *info
;
557 unlock_task_sighand(child
, &flags
);
563 #ifdef PTRACE_SINGLESTEP
564 #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
566 #define is_singlestep(request) 0
569 #ifdef PTRACE_SINGLEBLOCK
570 #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK)
572 #define is_singleblock(request) 0
576 #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP)
578 #define is_sysemu_singlestep(request) 0
581 static int ptrace_resume(struct task_struct
*child
, long request
,
584 if (!valid_signal(data
))
587 if (request
== PTRACE_SYSCALL
)
588 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
590 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
592 #ifdef TIF_SYSCALL_EMU
593 if (request
== PTRACE_SYSEMU
|| request
== PTRACE_SYSEMU_SINGLESTEP
)
594 set_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
596 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
599 if (is_singleblock(request
)) {
600 if (unlikely(!arch_has_block_step()))
602 user_enable_block_step(child
);
603 } else if (is_singlestep(request
) || is_sysemu_singlestep(request
)) {
604 if (unlikely(!arch_has_single_step()))
606 user_enable_single_step(child
);
608 user_disable_single_step(child
);
611 child
->exit_code
= data
;
612 wake_up_state(child
, __TASK_TRACED
);
617 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
619 static const struct user_regset
*
620 find_regset(const struct user_regset_view
*view
, unsigned int type
)
622 const struct user_regset
*regset
;
625 for (n
= 0; n
< view
->n
; ++n
) {
626 regset
= view
->regsets
+ n
;
627 if (regset
->core_note_type
== type
)
634 static int ptrace_regset(struct task_struct
*task
, int req
, unsigned int type
,
637 const struct user_regset_view
*view
= task_user_regset_view(task
);
638 const struct user_regset
*regset
= find_regset(view
, type
);
641 if (!regset
|| (kiov
->iov_len
% regset
->size
) != 0)
644 regset_no
= regset
- view
->regsets
;
645 kiov
->iov_len
= min(kiov
->iov_len
,
646 (__kernel_size_t
) (regset
->n
* regset
->size
));
648 if (req
== PTRACE_GETREGSET
)
649 return copy_regset_to_user(task
, view
, regset_no
, 0,
650 kiov
->iov_len
, kiov
->iov_base
);
652 return copy_regset_from_user(task
, view
, regset_no
, 0,
653 kiov
->iov_len
, kiov
->iov_base
);
658 int ptrace_request(struct task_struct
*child
, long request
,
659 unsigned long addr
, unsigned long data
)
663 void __user
*datavp
= (void __user
*) data
;
664 unsigned long __user
*datalp
= datavp
;
667 case PTRACE_PEEKTEXT
:
668 case PTRACE_PEEKDATA
:
669 return generic_ptrace_peekdata(child
, addr
, data
);
670 case PTRACE_POKETEXT
:
671 case PTRACE_POKEDATA
:
672 return generic_ptrace_pokedata(child
, addr
, data
);
674 #ifdef PTRACE_OLDSETOPTIONS
675 case PTRACE_OLDSETOPTIONS
:
677 case PTRACE_SETOPTIONS
:
678 ret
= ptrace_setoptions(child
, data
);
680 case PTRACE_GETEVENTMSG
:
681 ret
= put_user(child
->ptrace_message
, datalp
);
684 case PTRACE_GETSIGINFO
:
685 ret
= ptrace_getsiginfo(child
, &siginfo
);
687 ret
= copy_siginfo_to_user(datavp
, &siginfo
);
690 case PTRACE_SETSIGINFO
:
691 if (copy_from_user(&siginfo
, datavp
, sizeof siginfo
))
694 ret
= ptrace_setsiginfo(child
, &siginfo
);
697 case PTRACE_DETACH
: /* detach a process that was attached. */
698 ret
= ptrace_detach(child
, data
);
701 #ifdef CONFIG_BINFMT_ELF_FDPIC
702 case PTRACE_GETFDPIC
: {
703 struct mm_struct
*mm
= get_task_mm(child
);
704 unsigned long tmp
= 0;
711 case PTRACE_GETFDPIC_EXEC
:
712 tmp
= mm
->context
.exec_fdpic_loadmap
;
714 case PTRACE_GETFDPIC_INTERP
:
715 tmp
= mm
->context
.interp_fdpic_loadmap
;
722 ret
= put_user(tmp
, datalp
);
727 #ifdef PTRACE_SINGLESTEP
728 case PTRACE_SINGLESTEP
:
730 #ifdef PTRACE_SINGLEBLOCK
731 case PTRACE_SINGLEBLOCK
:
735 case PTRACE_SYSEMU_SINGLESTEP
:
739 return ptrace_resume(child
, request
, data
);
742 if (child
->exit_state
) /* already dead */
744 return ptrace_resume(child
, request
, SIGKILL
);
746 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
747 case PTRACE_GETREGSET
:
748 case PTRACE_SETREGSET
:
751 struct iovec __user
*uiov
= datavp
;
753 if (!access_ok(VERIFY_WRITE
, uiov
, sizeof(*uiov
)))
756 if (__get_user(kiov
.iov_base
, &uiov
->iov_base
) ||
757 __get_user(kiov
.iov_len
, &uiov
->iov_len
))
760 ret
= ptrace_regset(child
, request
, addr
, &kiov
);
762 ret
= __put_user(kiov
.iov_len
, &uiov
->iov_len
);
773 static struct task_struct
*ptrace_get_task_struct(pid_t pid
)
775 struct task_struct
*child
;
778 child
= find_task_by_vpid(pid
);
780 get_task_struct(child
);
784 return ERR_PTR(-ESRCH
);
788 #ifndef arch_ptrace_attach
789 #define arch_ptrace_attach(child) do { } while (0)
792 SYSCALL_DEFINE4(ptrace
, long, request
, long, pid
, unsigned long, addr
,
795 struct task_struct
*child
;
798 if (request
== PTRACE_TRACEME
) {
799 ret
= ptrace_traceme();
801 arch_ptrace_attach(current
);
805 child
= ptrace_get_task_struct(pid
);
807 ret
= PTR_ERR(child
);
811 if (request
== PTRACE_ATTACH
|| request
== PTRACE_SEIZE
) {
812 ret
= ptrace_attach(child
, request
, data
);
814 * Some architectures need to do book-keeping after
818 arch_ptrace_attach(child
);
819 goto out_put_task_struct
;
822 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
824 goto out_put_task_struct
;
826 ret
= arch_ptrace(child
, request
, addr
, data
);
829 put_task_struct(child
);
834 int generic_ptrace_peekdata(struct task_struct
*tsk
, unsigned long addr
,
840 copied
= access_process_vm(tsk
, addr
, &tmp
, sizeof(tmp
), 0);
841 if (copied
!= sizeof(tmp
))
843 return put_user(tmp
, (unsigned long __user
*)data
);
846 int generic_ptrace_pokedata(struct task_struct
*tsk
, unsigned long addr
,
851 copied
= access_process_vm(tsk
, addr
, &data
, sizeof(data
), 1);
852 return (copied
== sizeof(data
)) ? 0 : -EIO
;
855 #if defined CONFIG_COMPAT
856 #include <linux/compat.h>
858 int compat_ptrace_request(struct task_struct
*child
, compat_long_t request
,
859 compat_ulong_t addr
, compat_ulong_t data
)
861 compat_ulong_t __user
*datap
= compat_ptr(data
);
867 case PTRACE_PEEKTEXT
:
868 case PTRACE_PEEKDATA
:
869 ret
= access_process_vm(child
, addr
, &word
, sizeof(word
), 0);
870 if (ret
!= sizeof(word
))
873 ret
= put_user(word
, datap
);
876 case PTRACE_POKETEXT
:
877 case PTRACE_POKEDATA
:
878 ret
= access_process_vm(child
, addr
, &data
, sizeof(data
), 1);
879 ret
= (ret
!= sizeof(data
) ? -EIO
: 0);
882 case PTRACE_GETEVENTMSG
:
883 ret
= put_user((compat_ulong_t
) child
->ptrace_message
, datap
);
886 case PTRACE_GETSIGINFO
:
887 ret
= ptrace_getsiginfo(child
, &siginfo
);
889 ret
= copy_siginfo_to_user32(
890 (struct compat_siginfo __user
*) datap
,
894 case PTRACE_SETSIGINFO
:
895 memset(&siginfo
, 0, sizeof siginfo
);
896 if (copy_siginfo_from_user32(
897 &siginfo
, (struct compat_siginfo __user
*) datap
))
900 ret
= ptrace_setsiginfo(child
, &siginfo
);
902 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
903 case PTRACE_GETREGSET
:
904 case PTRACE_SETREGSET
:
907 struct compat_iovec __user
*uiov
=
908 (struct compat_iovec __user
*) datap
;
912 if (!access_ok(VERIFY_WRITE
, uiov
, sizeof(*uiov
)))
915 if (__get_user(ptr
, &uiov
->iov_base
) ||
916 __get_user(len
, &uiov
->iov_len
))
919 kiov
.iov_base
= compat_ptr(ptr
);
922 ret
= ptrace_regset(child
, request
, addr
, &kiov
);
924 ret
= __put_user(kiov
.iov_len
, &uiov
->iov_len
);
930 ret
= ptrace_request(child
, request
, addr
, data
);
936 asmlinkage
long compat_sys_ptrace(compat_long_t request
, compat_long_t pid
,
937 compat_long_t addr
, compat_long_t data
)
939 struct task_struct
*child
;
942 if (request
== PTRACE_TRACEME
) {
943 ret
= ptrace_traceme();
947 child
= ptrace_get_task_struct(pid
);
949 ret
= PTR_ERR(child
);
953 if (request
== PTRACE_ATTACH
|| request
== PTRACE_SEIZE
) {
954 ret
= ptrace_attach(child
, request
, data
);
956 * Some architectures need to do book-keeping after
960 arch_ptrace_attach(child
);
961 goto out_put_task_struct
;
964 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
966 ret
= compat_arch_ptrace(child
, request
, addr
, data
);
969 put_task_struct(child
);
973 #endif /* CONFIG_COMPAT */
975 #ifdef CONFIG_HAVE_HW_BREAKPOINT
976 int ptrace_get_breakpoints(struct task_struct
*tsk
)
978 if (atomic_inc_not_zero(&tsk
->ptrace_bp_refcnt
))
984 void ptrace_put_breakpoints(struct task_struct
*tsk
)
986 if (atomic_dec_and_test(&tsk
->ptrace_bp_refcnt
))
987 flush_ptrace_hw_breakpoint(tsk
);
989 #endif /* CONFIG_HAVE_HW_BREAKPOINT */