]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - kernel/ptrace.c
NVMe: Remove unused sq_head read in completion path
[mirror_ubuntu-artful-kernel.git] / kernel / ptrace.c
CommitLineData
1da177e4
LT
1/*
2 * linux/kernel/ptrace.c
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 *
6 * Common interfaces for "ptrace()" which we do not want
7 * to continually duplicate across every architecture.
8 */
9
c59ede7b 10#include <linux/capability.h>
9984de1a 11#include <linux/export.h>
1da177e4
LT
12#include <linux/sched.h>
13#include <linux/errno.h>
14#include <linux/mm.h>
15#include <linux/highmem.h>
16#include <linux/pagemap.h>
1da177e4
LT
17#include <linux/ptrace.h>
18#include <linux/security.h>
7ed20e1a 19#include <linux/signal.h>
a27bb332 20#include <linux/uio.h>
a5cb013d 21#include <linux/audit.h>
b488893a 22#include <linux/pid_namespace.h>
f17d30a8 23#include <linux/syscalls.h>
3a709703 24#include <linux/uaccess.h>
2225a122 25#include <linux/regset.h>
bf26c018 26#include <linux/hw_breakpoint.h>
f701e5b7 27#include <linux/cn_proc.h>
84c751bd 28#include <linux/compat.h>
1da177e4 29
bf53de90 30
1da177e4
LT
31/*
32 * ptrace a task: make the debugger its new parent and
33 * move it to the ptrace list.
34 *
35 * Must be called with the tasklist lock write-held.
36 */
36c8b586 37void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
1da177e4 38{
f470021a
RM
39 BUG_ON(!list_empty(&child->ptrace_entry));
40 list_add(&child->ptrace_entry, &new_parent->ptraced);
1da177e4 41 child->parent = new_parent;
1da177e4 42}
3a709703 43
e3bd058f
TH
44/**
45 * __ptrace_unlink - unlink ptracee and restore its execution state
46 * @child: ptracee to be unlinked
1da177e4 47 *
0e9f0a4a
TH
48 * Remove @child from the ptrace list, move it back to the original parent,
49 * and restore the execution state so that it conforms to the group stop
50 * state.
51 *
52 * Unlinking can happen via two paths - explicit PTRACE_DETACH or ptracer
53 * exiting. For PTRACE_DETACH, unless the ptracee has been killed between
54 * ptrace_check_attach() and here, it's guaranteed to be in TASK_TRACED.
55 * If the ptracer is exiting, the ptracee can be in any state.
56 *
57 * After detach, the ptracee should be in a state which conforms to the
58 * group stop. If the group is stopped or in the process of stopping, the
59 * ptracee should be put into TASK_STOPPED; otherwise, it should be woken
60 * up from TASK_TRACED.
61 *
62 * If the ptracee is in TASK_TRACED and needs to be moved to TASK_STOPPED,
63 * it goes through TRACED -> RUNNING -> STOPPED transition which is similar
64 * to but in the opposite direction of what happens while attaching to a
65 * stopped task. However, in this direction, the intermediate RUNNING
66 * state is not hidden even from the current ptracer and if it immediately
67 * re-attaches and performs a WNOHANG wait(2), it may fail.
e3bd058f
TH
68 *
69 * CONTEXT:
70 * write_lock_irq(tasklist_lock)
1da177e4 71 */
36c8b586 72void __ptrace_unlink(struct task_struct *child)
1da177e4 73{
5ecfbae0
ON
74 BUG_ON(!child->ptrace);
75
1da177e4 76 child->ptrace = 0;
f470021a
RM
77 child->parent = child->real_parent;
78 list_del_init(&child->ptrace_entry);
1da177e4 79
1da177e4 80 spin_lock(&child->sighand->siglock);
0e9f0a4a 81
73ddff2b
TH
82 /*
83 * Clear all pending traps and TRAPPING. TRAPPING should be
84 * cleared regardless of JOBCTL_STOP_PENDING. Do it explicitly.
85 */
86 task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK);
87 task_clear_jobctl_trapping(child);
88
0e9f0a4a 89 /*
a8f072c1 90 * Reinstate JOBCTL_STOP_PENDING if group stop is in effect and
0e9f0a4a
TH
91 * @child isn't dead.
92 */
93 if (!(child->flags & PF_EXITING) &&
94 (child->signal->flags & SIGNAL_STOP_STOPPED ||
8a88951b 95 child->signal->group_stop_count)) {
a8f072c1 96 child->jobctl |= JOBCTL_STOP_PENDING;
0e9f0a4a 97
8a88951b
ON
98 /*
99 * This is only possible if this thread was cloned by the
100 * traced task running in the stopped group, set the signal
101 * for the future reports.
102 * FIXME: we should change ptrace_init_task() to handle this
103 * case.
104 */
105 if (!(child->jobctl & JOBCTL_STOP_SIGMASK))
106 child->jobctl |= SIGSTOP;
107 }
108
0e9f0a4a
TH
109 /*
110 * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick
111 * @child in the butt. Note that @resume should be used iff @child
112 * is in TASK_TRACED; otherwise, we might unduly disrupt
113 * TASK_KILLABLE sleeps.
114 */
a8f072c1 115 if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child))
910ffdb1 116 ptrace_signal_wake_up(child, true);
0e9f0a4a 117
1da177e4 118 spin_unlock(&child->sighand->siglock);
1da177e4
LT
119}
120
9899d11f
ON
121/* Ensure that nothing can wake it up, even SIGKILL */
122static bool ptrace_freeze_traced(struct task_struct *task)
123{
124 bool ret = false;
125
126 /* Lockless, nobody but us can set this flag */
127 if (task->jobctl & JOBCTL_LISTENING)
128 return ret;
129
130 spin_lock_irq(&task->sighand->siglock);
131 if (task_is_traced(task) && !__fatal_signal_pending(task)) {
132 task->state = __TASK_TRACED;
133 ret = true;
134 }
135 spin_unlock_irq(&task->sighand->siglock);
136
137 return ret;
138}
139
140static void ptrace_unfreeze_traced(struct task_struct *task)
141{
142 if (task->state != __TASK_TRACED)
143 return;
144
145 WARN_ON(!task->ptrace || task->parent != current);
146
147 spin_lock_irq(&task->sighand->siglock);
148 if (__fatal_signal_pending(task))
149 wake_up_state(task, __TASK_TRACED);
150 else
151 task->state = TASK_TRACED;
152 spin_unlock_irq(&task->sighand->siglock);
153}
154
755e276b
TH
155/**
156 * ptrace_check_attach - check whether ptracee is ready for ptrace operation
157 * @child: ptracee to check for
158 * @ignore_state: don't check whether @child is currently %TASK_TRACED
159 *
160 * Check whether @child is being ptraced by %current and ready for further
161 * ptrace operations. If @ignore_state is %false, @child also should be in
162 * %TASK_TRACED state and on return the child is guaranteed to be traced
163 * and not executing. If @ignore_state is %true, @child can be in any
164 * state.
165 *
166 * CONTEXT:
167 * Grabs and releases tasklist_lock and @child->sighand->siglock.
168 *
169 * RETURNS:
170 * 0 on success, -ESRCH if %child is not ready.
1da177e4 171 */
edea0d03 172static int ptrace_check_attach(struct task_struct *child, bool ignore_state)
1da177e4
LT
173{
174 int ret = -ESRCH;
175
176 /*
177 * We take the read lock around doing both checks to close a
178 * possible race where someone else was tracing our child and
179 * detached between these two checks. After this locked check,
180 * we are sure that this is our traced child and that can only
181 * be changed by us so it's not changing right after this.
182 */
183 read_lock(&tasklist_lock);
9899d11f
ON
184 if (child->ptrace && child->parent == current) {
185 WARN_ON(child->state == __TASK_TRACED);
c0c0b649
ON
186 /*
187 * child->sighand can't be NULL, release_task()
188 * does ptrace_unlink() before __exit_signal().
189 */
9899d11f 190 if (ignore_state || ptrace_freeze_traced(child))
321fb561 191 ret = 0;
1da177e4
LT
192 }
193 read_unlock(&tasklist_lock);
194
9899d11f
ON
195 if (!ret && !ignore_state) {
196 if (!wait_task_inactive(child, __TASK_TRACED)) {
197 /*
198 * This can only happen if may_ptrace_stop() fails and
199 * ptrace_stop() changes ->state back to TASK_RUNNING,
200 * so we should not worry about leaking __TASK_TRACED.
201 */
202 WARN_ON(child->state == __TASK_TRACED);
203 ret = -ESRCH;
204 }
205 }
1da177e4 206
1da177e4
LT
207 return ret;
208}
209
69f594a3
EP
210static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
211{
212 if (mode & PTRACE_MODE_NOAUDIT)
213 return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE);
214 else
215 return has_ns_capability(current, ns, CAP_SYS_PTRACE);
216}
217
9f99798f
TH
218/* Returns 0 on success, -errno on denial. */
219static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
ab8d11be 220{
c69e8d9c 221 const struct cred *cred = current_cred(), *tcred;
caaee623
JH
222 int dumpable = 0;
223 kuid_t caller_uid;
224 kgid_t caller_gid;
225
226 if (!(mode & PTRACE_MODE_FSCREDS) == !(mode & PTRACE_MODE_REALCREDS)) {
227 WARN(1, "denying ptrace access check without PTRACE_MODE_*CREDS\n");
228 return -EPERM;
229 }
b6dff3ec 230
df26c40e
EB
231 /* May we inspect the given task?
232 * This check is used both for attaching with ptrace
233 * and for allowing access to sensitive information in /proc.
234 *
235 * ptrace_attach denies several cases that /proc allows
236 * because setting up the necessary parent/child relationship
237 * or halting the specified task is impossible.
238 */
caaee623 239
df26c40e 240 /* Don't let security modules deny introspection */
73af963f 241 if (same_thread_group(task, current))
df26c40e 242 return 0;
c69e8d9c 243 rcu_read_lock();
caaee623
JH
244 if (mode & PTRACE_MODE_FSCREDS) {
245 caller_uid = cred->fsuid;
246 caller_gid = cred->fsgid;
247 } else {
248 /*
249 * Using the euid would make more sense here, but something
250 * in userland might rely on the old behavior, and this
251 * shouldn't be a security problem since
252 * PTRACE_MODE_REALCREDS implies that the caller explicitly
253 * used a syscall that requests access to another process
254 * (and not a filesystem syscall to procfs).
255 */
256 caller_uid = cred->uid;
257 caller_gid = cred->gid;
258 }
c69e8d9c 259 tcred = __task_cred(task);
caaee623
JH
260 if (uid_eq(caller_uid, tcred->euid) &&
261 uid_eq(caller_uid, tcred->suid) &&
262 uid_eq(caller_uid, tcred->uid) &&
263 gid_eq(caller_gid, tcred->egid) &&
264 gid_eq(caller_gid, tcred->sgid) &&
265 gid_eq(caller_gid, tcred->gid))
8409cca7 266 goto ok;
c4a4d603 267 if (ptrace_has_cap(tcred->user_ns, mode))
8409cca7
SH
268 goto ok;
269 rcu_read_unlock();
270 return -EPERM;
271ok:
c69e8d9c 272 rcu_read_unlock();
ab8d11be 273 smp_rmb();
df26c40e 274 if (task->mm)
6c5d5238 275 dumpable = get_dumpable(task->mm);
4c44aaaf 276 rcu_read_lock();
d049f74f
KC
277 if (dumpable != SUID_DUMP_USER &&
278 !ptrace_has_cap(__task_cred(task)->user_ns, mode)) {
4c44aaaf 279 rcu_read_unlock();
ab8d11be 280 return -EPERM;
4c44aaaf
EB
281 }
282 rcu_read_unlock();
ab8d11be 283
9e48858f 284 return security_ptrace_access_check(task, mode);
ab8d11be
MS
285}
286
006ebb40 287bool ptrace_may_access(struct task_struct *task, unsigned int mode)
ab8d11be
MS
288{
289 int err;
290 task_lock(task);
006ebb40 291 err = __ptrace_may_access(task, mode);
ab8d11be 292 task_unlock(task);
3a709703 293 return !err;
ab8d11be
MS
294}
295
3544d72a 296static int ptrace_attach(struct task_struct *task, long request,
aa9147c9 297 unsigned long addr,
3544d72a 298 unsigned long flags)
1da177e4 299{
3544d72a 300 bool seize = (request == PTRACE_SEIZE);
1da177e4 301 int retval;
f5b40e36 302
3544d72a 303 retval = -EIO;
aa9147c9
DV
304 if (seize) {
305 if (addr != 0)
306 goto out;
aa9147c9
DV
307 if (flags & ~(unsigned long)PTRACE_O_MASK)
308 goto out;
309 flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);
310 } else {
311 flags = PT_PTRACED;
312 }
3544d72a 313
a5cb013d
AV
314 audit_ptrace(task);
315
1da177e4 316 retval = -EPERM;
b79b7ba9
ON
317 if (unlikely(task->flags & PF_KTHREAD))
318 goto out;
bac0abd6 319 if (same_thread_group(task, current))
f5b40e36
LT
320 goto out;
321
f2f0b00a
ON
322 /*
323 * Protect exec's credential calculations against our interference;
86b6c1f3 324 * SUID, SGID and LSM creds get determined differently
5e751e99 325 * under ptrace.
d84f4f99 326 */
793285fc 327 retval = -ERESTARTNOINTR;
9b1bf12d 328 if (mutex_lock_interruptible(&task->signal->cred_guard_mutex))
d84f4f99 329 goto out;
f5b40e36 330
4b105cbb 331 task_lock(task);
caaee623 332 retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS);
4b105cbb 333 task_unlock(task);
1da177e4 334 if (retval)
4b105cbb 335 goto unlock_creds;
1da177e4 336
4b105cbb 337 write_lock_irq(&tasklist_lock);
b79b7ba9
ON
338 retval = -EPERM;
339 if (unlikely(task->exit_state))
4b105cbb 340 goto unlock_tasklist;
f2f0b00a 341 if (task->ptrace)
4b105cbb 342 goto unlock_tasklist;
b79b7ba9 343
3544d72a 344 if (seize)
aa9147c9 345 flags |= PT_SEIZED;
4c44aaaf
EB
346 rcu_read_lock();
347 if (ns_capable(__task_cred(task)->user_ns, CAP_SYS_PTRACE))
aa9147c9 348 flags |= PT_PTRACE_CAP;
4c44aaaf 349 rcu_read_unlock();
aa9147c9 350 task->ptrace = flags;
1da177e4 351
1da177e4 352 __ptrace_link(task, current);
3544d72a
TH
353
354 /* SEIZE doesn't trap tracee on attach */
355 if (!seize)
356 send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
b79b7ba9 357
d79fdd6d
TH
358 spin_lock(&task->sighand->siglock);
359
360 /*
73ddff2b 361 * If the task is already STOPPED, set JOBCTL_TRAP_STOP and
d79fdd6d
TH
362 * TRAPPING, and kick it so that it transits to TRACED. TRAPPING
363 * will be cleared if the child completes the transition or any
364 * event which clears the group stop states happens. We'll wait
365 * for the transition to complete before returning from this
366 * function.
367 *
368 * This hides STOPPED -> RUNNING -> TRACED transition from the
369 * attaching thread but a different thread in the same group can
370 * still observe the transient RUNNING state. IOW, if another
371 * thread's WNOHANG wait(2) on the stopped tracee races against
372 * ATTACH, the wait(2) may fail due to the transient RUNNING.
373 *
374 * The following task_is_stopped() test is safe as both transitions
375 * in and out of STOPPED are protected by siglock.
376 */
7dd3db54 377 if (task_is_stopped(task) &&
73ddff2b 378 task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING))
910ffdb1 379 signal_wake_up_state(task, __TASK_STOPPED);
d79fdd6d
TH
380
381 spin_unlock(&task->sighand->siglock);
382
b79b7ba9 383 retval = 0;
4b105cbb
ON
384unlock_tasklist:
385 write_unlock_irq(&tasklist_lock);
386unlock_creds:
9b1bf12d 387 mutex_unlock(&task->signal->cred_guard_mutex);
f5b40e36 388out:
f701e5b7 389 if (!retval) {
7c3b00e0
ON
390 /*
391 * We do not bother to change retval or clear JOBCTL_TRAPPING
392 * if wait_on_bit() was interrupted by SIGKILL. The tracer will
393 * not return to user-mode, it will exit and clear this bit in
394 * __ptrace_unlink() if it wasn't already cleared by the tracee;
395 * and until then nobody can ptrace this task.
396 */
397 wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, TASK_KILLABLE);
f701e5b7
VZ
398 proc_ptrace_connector(task, PTRACE_ATTACH);
399 }
400
1da177e4
LT
401 return retval;
402}
403
f2f0b00a
ON
404/**
405 * ptrace_traceme -- helper for PTRACE_TRACEME
406 *
407 * Performs checks and sets PT_PTRACED.
408 * Should be used by all ptrace implementations for PTRACE_TRACEME.
409 */
e3e89cc5 410static int ptrace_traceme(void)
f2f0b00a
ON
411{
412 int ret = -EPERM;
413
4b105cbb
ON
414 write_lock_irq(&tasklist_lock);
415 /* Are we already being traced? */
f2f0b00a 416 if (!current->ptrace) {
f2f0b00a 417 ret = security_ptrace_traceme(current->parent);
f2f0b00a
ON
418 /*
419 * Check PF_EXITING to ensure ->real_parent has not passed
420 * exit_ptrace(). Otherwise we don't report the error but
421 * pretend ->real_parent untraces us right after return.
422 */
423 if (!ret && !(current->real_parent->flags & PF_EXITING)) {
424 current->ptrace = PT_PTRACED;
425 __ptrace_link(current, current->real_parent);
426 }
f2f0b00a 427 }
4b105cbb
ON
428 write_unlock_irq(&tasklist_lock);
429
f2f0b00a
ON
430 return ret;
431}
432
39c626ae
ON
433/*
434 * Called with irqs disabled, returns true if childs should reap themselves.
435 */
436static int ignoring_children(struct sighand_struct *sigh)
437{
438 int ret;
439 spin_lock(&sigh->siglock);
440 ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) ||
441 (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT);
442 spin_unlock(&sigh->siglock);
443 return ret;
444}
445
446/*
447 * Called with tasklist_lock held for writing.
448 * Unlink a traced task, and clean it up if it was a traced zombie.
449 * Return true if it needs to be reaped with release_task().
450 * (We can't call release_task() here because we already hold tasklist_lock.)
451 *
452 * If it's a zombie, our attachedness prevented normal parent notification
453 * or self-reaping. Do notification now if it would have happened earlier.
454 * If it should reap itself, return true.
455 *
a7f0765e
ON
456 * If it's our own child, there is no notification to do. But if our normal
457 * children self-reap, then this child was prevented by ptrace and we must
458 * reap it now, in that case we must also wake up sub-threads sleeping in
459 * do_wait().
39c626ae
ON
460 */
461static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
462{
9843a1e9
ON
463 bool dead;
464
39c626ae
ON
465 __ptrace_unlink(p);
466
9843a1e9
ON
467 if (p->exit_state != EXIT_ZOMBIE)
468 return false;
469
470 dead = !thread_group_leader(p);
471
472 if (!dead && thread_group_empty(p)) {
473 if (!same_thread_group(p->real_parent, tracer))
474 dead = do_notify_parent(p, p->exit_signal);
475 else if (ignoring_children(tracer->sighand)) {
476 __wake_up_parent(p, tracer);
9843a1e9 477 dead = true;
39c626ae
ON
478 }
479 }
9843a1e9
ON
480 /* Mark it as in the process of being reaped. */
481 if (dead)
482 p->exit_state = EXIT_DEAD;
483 return dead;
39c626ae
ON
484}
485
e3e89cc5 486static int ptrace_detach(struct task_struct *child, unsigned int data)
1da177e4 487{
7ed20e1a 488 if (!valid_signal(data))
5ecfbae0 489 return -EIO;
1da177e4
LT
490
491 /* Architecture-specific hardware disable .. */
492 ptrace_disable(child);
7d941432 493 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
1da177e4 494
95c3eb76 495 write_lock_irq(&tasklist_lock);
39c626ae 496 /*
64a4096c
ON
497 * We rely on ptrace_freeze_traced(). It can't be killed and
498 * untraced by another thread, it can't be a zombie.
39c626ae 499 */
64a4096c
ON
500 WARN_ON(!child->ptrace || child->exit_state);
501 /*
502 * tasklist_lock avoids the race with wait_task_stopped(), see
503 * the comment in ptrace_resume().
504 */
505 child->exit_code = data;
506 __ptrace_detach(current, child);
1da177e4
LT
507 write_unlock_irq(&tasklist_lock);
508
f701e5b7 509 proc_ptrace_connector(child, PTRACE_DETACH);
4576145c 510
1da177e4
LT
511 return 0;
512}
513
39c626ae 514/*
c7e49c14 515 * Detach all tasks we were using ptrace on. Called with tasklist held
7c8bd232 516 * for writing.
39c626ae 517 */
7c8bd232 518void exit_ptrace(struct task_struct *tracer, struct list_head *dead)
39c626ae
ON
519{
520 struct task_struct *p, *n;
c7e49c14 521
39c626ae 522 list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
992fb6e1
ON
523 if (unlikely(p->ptrace & PT_EXITKILL))
524 send_sig_info(SIGKILL, SEND_SIG_FORCED, p);
525
39c626ae 526 if (__ptrace_detach(tracer, p))
7c8bd232 527 list_add(&p->ptrace_entry, dead);
39c626ae
ON
528 }
529}
530
1da177e4
LT
531int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
532{
533 int copied = 0;
534
535 while (len > 0) {
536 char buf[128];
537 int this_len, retval;
538
539 this_len = (len > sizeof(buf)) ? sizeof(buf) : len;
540 retval = access_process_vm(tsk, src, buf, this_len, 0);
541 if (!retval) {
542 if (copied)
543 break;
544 return -EIO;
545 }
546 if (copy_to_user(dst, buf, retval))
547 return -EFAULT;
548 copied += retval;
549 src += retval;
550 dst += retval;
3a709703 551 len -= retval;
1da177e4
LT
552 }
553 return copied;
554}
555
556int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len)
557{
558 int copied = 0;
559
560 while (len > 0) {
561 char buf[128];
562 int this_len, retval;
563
564 this_len = (len > sizeof(buf)) ? sizeof(buf) : len;
565 if (copy_from_user(buf, src, this_len))
566 return -EFAULT;
567 retval = access_process_vm(tsk, dst, buf, this_len, 1);
568 if (!retval) {
569 if (copied)
570 break;
571 return -EIO;
572 }
573 copied += retval;
574 src += retval;
575 dst += retval;
3a709703 576 len -= retval;
1da177e4
LT
577 }
578 return copied;
579}
580
4abf9869 581static int ptrace_setoptions(struct task_struct *child, unsigned long data)
1da177e4 582{
86b6c1f3
DV
583 unsigned flags;
584
8c5cf9e5
DV
585 if (data & ~(unsigned long)PTRACE_O_MASK)
586 return -EINVAL;
587
13c4a901
TA
588 if (unlikely(data & PTRACE_O_SUSPEND_SECCOMP)) {
589 if (!config_enabled(CONFIG_CHECKPOINT_RESTORE) ||
590 !config_enabled(CONFIG_SECCOMP))
591 return -EINVAL;
592
593 if (!capable(CAP_SYS_ADMIN))
594 return -EPERM;
595
596 if (seccomp_mode(&current->seccomp) != SECCOMP_MODE_DISABLED ||
597 current->ptrace & PT_SUSPEND_SECCOMP)
598 return -EPERM;
599 }
600
86b6c1f3
DV
601 /* Avoid intermediate state when all opts are cleared */
602 flags = child->ptrace;
603 flags &= ~(PTRACE_O_MASK << PT_OPT_FLAG_SHIFT);
604 flags |= (data << PT_OPT_FLAG_SHIFT);
605 child->ptrace = flags;
1da177e4 606
8c5cf9e5 607 return 0;
1da177e4
LT
608}
609
e16b2781 610static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
1da177e4 611{
e4961254 612 unsigned long flags;
1da177e4
LT
613 int error = -ESRCH;
614
e4961254 615 if (lock_task_sighand(child, &flags)) {
1da177e4 616 error = -EINVAL;
1da177e4 617 if (likely(child->last_siginfo != NULL)) {
e16b2781 618 *info = *child->last_siginfo;
1da177e4
LT
619 error = 0;
620 }
e4961254 621 unlock_task_sighand(child, &flags);
1da177e4 622 }
1da177e4
LT
623 return error;
624}
625
e16b2781 626static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
1da177e4 627{
e4961254 628 unsigned long flags;
1da177e4
LT
629 int error = -ESRCH;
630
e4961254 631 if (lock_task_sighand(child, &flags)) {
1da177e4 632 error = -EINVAL;
1da177e4 633 if (likely(child->last_siginfo != NULL)) {
e16b2781 634 *child->last_siginfo = *info;
1da177e4
LT
635 error = 0;
636 }
e4961254 637 unlock_task_sighand(child, &flags);
1da177e4 638 }
1da177e4
LT
639 return error;
640}
641
84c751bd
AV
642static int ptrace_peek_siginfo(struct task_struct *child,
643 unsigned long addr,
644 unsigned long data)
645{
646 struct ptrace_peeksiginfo_args arg;
647 struct sigpending *pending;
648 struct sigqueue *q;
649 int ret, i;
650
651 ret = copy_from_user(&arg, (void __user *) addr,
652 sizeof(struct ptrace_peeksiginfo_args));
653 if (ret)
654 return -EFAULT;
655
656 if (arg.flags & ~PTRACE_PEEKSIGINFO_SHARED)
657 return -EINVAL; /* unknown flags */
658
659 if (arg.nr < 0)
660 return -EINVAL;
661
662 if (arg.flags & PTRACE_PEEKSIGINFO_SHARED)
663 pending = &child->signal->shared_pending;
664 else
665 pending = &child->pending;
666
667 for (i = 0; i < arg.nr; ) {
668 siginfo_t info;
669 s32 off = arg.off + i;
670
671 spin_lock_irq(&child->sighand->siglock);
672 list_for_each_entry(q, &pending->list, list) {
673 if (!off--) {
674 copy_siginfo(&info, &q->info);
675 break;
676 }
677 }
678 spin_unlock_irq(&child->sighand->siglock);
679
680 if (off >= 0) /* beyond the end of the list */
681 break;
682
683#ifdef CONFIG_COMPAT
684 if (unlikely(is_compat_task())) {
685 compat_siginfo_t __user *uinfo = compat_ptr(data);
686
706b23bd
MD
687 if (copy_siginfo_to_user32(uinfo, &info) ||
688 __put_user(info.si_code, &uinfo->si_code)) {
689 ret = -EFAULT;
690 break;
691 }
692
84c751bd
AV
693 } else
694#endif
695 {
696 siginfo_t __user *uinfo = (siginfo_t __user *) data;
697
706b23bd
MD
698 if (copy_siginfo_to_user(uinfo, &info) ||
699 __put_user(info.si_code, &uinfo->si_code)) {
700 ret = -EFAULT;
701 break;
702 }
84c751bd
AV
703 }
704
705 data += sizeof(siginfo_t);
706 i++;
707
708 if (signal_pending(current))
709 break;
710
711 cond_resched();
712 }
713
714 if (i > 0)
715 return i;
716
717 return ret;
718}
36df29d7
RM
719
720#ifdef PTRACE_SINGLESTEP
721#define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
722#else
723#define is_singlestep(request) 0
724#endif
725
5b88abbf
RM
726#ifdef PTRACE_SINGLEBLOCK
727#define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK)
728#else
729#define is_singleblock(request) 0
730#endif
731
36df29d7
RM
732#ifdef PTRACE_SYSEMU
733#define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP)
734#else
735#define is_sysemu_singlestep(request) 0
736#endif
737
4abf9869
NK
738static int ptrace_resume(struct task_struct *child, long request,
739 unsigned long data)
36df29d7 740{
b72c1869
ON
741 bool need_siglock;
742
36df29d7
RM
743 if (!valid_signal(data))
744 return -EIO;
745
746 if (request == PTRACE_SYSCALL)
747 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
748 else
749 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
750
751#ifdef TIF_SYSCALL_EMU
752 if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP)
753 set_tsk_thread_flag(child, TIF_SYSCALL_EMU);
754 else
755 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
756#endif
757
5b88abbf
RM
758 if (is_singleblock(request)) {
759 if (unlikely(!arch_has_block_step()))
760 return -EIO;
761 user_enable_block_step(child);
762 } else if (is_singlestep(request) || is_sysemu_singlestep(request)) {
36df29d7
RM
763 if (unlikely(!arch_has_single_step()))
764 return -EIO;
765 user_enable_single_step(child);
3a709703 766 } else {
36df29d7 767 user_disable_single_step(child);
3a709703 768 }
36df29d7 769
b72c1869
ON
770 /*
771 * Change ->exit_code and ->state under siglock to avoid the race
772 * with wait_task_stopped() in between; a non-zero ->exit_code will
773 * wrongly look like another report from tracee.
774 *
775 * Note that we need siglock even if ->exit_code == data and/or this
776 * status was not reported yet, the new status must not be cleared by
777 * wait_task_stopped() after resume.
778 *
779 * If data == 0 we do not care if wait_task_stopped() reports the old
780 * status and clears the code too; this can't race with the tracee, it
781 * takes siglock after resume.
782 */
783 need_siglock = data && !thread_group_empty(current);
784 if (need_siglock)
785 spin_lock_irq(&child->sighand->siglock);
36df29d7 786 child->exit_code = data;
0666fb51 787 wake_up_state(child, __TASK_TRACED);
b72c1869
ON
788 if (need_siglock)
789 spin_unlock_irq(&child->sighand->siglock);
36df29d7
RM
790
791 return 0;
792}
793
2225a122
SS
794#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
795
796static const struct user_regset *
797find_regset(const struct user_regset_view *view, unsigned int type)
798{
799 const struct user_regset *regset;
800 int n;
801
802 for (n = 0; n < view->n; ++n) {
803 regset = view->regsets + n;
804 if (regset->core_note_type == type)
805 return regset;
806 }
807
808 return NULL;
809}
810
811static int ptrace_regset(struct task_struct *task, int req, unsigned int type,
812 struct iovec *kiov)
813{
814 const struct user_regset_view *view = task_user_regset_view(task);
815 const struct user_regset *regset = find_regset(view, type);
816 int regset_no;
817
818 if (!regset || (kiov->iov_len % regset->size) != 0)
c6a0dd7e 819 return -EINVAL;
2225a122
SS
820
821 regset_no = regset - view->regsets;
822 kiov->iov_len = min(kiov->iov_len,
823 (__kernel_size_t) (regset->n * regset->size));
824
825 if (req == PTRACE_GETREGSET)
826 return copy_regset_to_user(task, view, regset_no, 0,
827 kiov->iov_len, kiov->iov_base);
828 else
829 return copy_regset_from_user(task, view, regset_no, 0,
830 kiov->iov_len, kiov->iov_base);
831}
832
e8440c14
JS
833/*
834 * This is declared in linux/regset.h and defined in machine-dependent
835 * code. We put the export here, near the primary machine-neutral use,
836 * to ensure no machine forgets it.
837 */
838EXPORT_SYMBOL_GPL(task_user_regset_view);
2225a122
SS
839#endif
840
1da177e4 841int ptrace_request(struct task_struct *child, long request,
4abf9869 842 unsigned long addr, unsigned long data)
1da177e4 843{
fca26f26 844 bool seized = child->ptrace & PT_SEIZED;
1da177e4 845 int ret = -EIO;
544b2c91 846 siginfo_t siginfo, *si;
9fed81dc
NK
847 void __user *datavp = (void __user *) data;
848 unsigned long __user *datalp = datavp;
fca26f26 849 unsigned long flags;
1da177e4
LT
850
851 switch (request) {
16c3e389
RM
852 case PTRACE_PEEKTEXT:
853 case PTRACE_PEEKDATA:
854 return generic_ptrace_peekdata(child, addr, data);
855 case PTRACE_POKETEXT:
856 case PTRACE_POKEDATA:
857 return generic_ptrace_pokedata(child, addr, data);
858
1da177e4
LT
859#ifdef PTRACE_OLDSETOPTIONS
860 case PTRACE_OLDSETOPTIONS:
861#endif
862 case PTRACE_SETOPTIONS:
863 ret = ptrace_setoptions(child, data);
864 break;
865 case PTRACE_GETEVENTMSG:
9fed81dc 866 ret = put_user(child->ptrace_message, datalp);
1da177e4 867 break;
e16b2781 868
84c751bd
AV
869 case PTRACE_PEEKSIGINFO:
870 ret = ptrace_peek_siginfo(child, addr, data);
871 break;
872
1da177e4 873 case PTRACE_GETSIGINFO:
e16b2781
RM
874 ret = ptrace_getsiginfo(child, &siginfo);
875 if (!ret)
9fed81dc 876 ret = copy_siginfo_to_user(datavp, &siginfo);
1da177e4 877 break;
e16b2781 878
1da177e4 879 case PTRACE_SETSIGINFO:
9fed81dc 880 if (copy_from_user(&siginfo, datavp, sizeof siginfo))
e16b2781
RM
881 ret = -EFAULT;
882 else
883 ret = ptrace_setsiginfo(child, &siginfo);
1da177e4 884 break;
e16b2781 885
29000cae
AV
886 case PTRACE_GETSIGMASK:
887 if (addr != sizeof(sigset_t)) {
888 ret = -EINVAL;
889 break;
890 }
891
892 if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t)))
893 ret = -EFAULT;
894 else
895 ret = 0;
896
897 break;
898
899 case PTRACE_SETSIGMASK: {
900 sigset_t new_set;
901
902 if (addr != sizeof(sigset_t)) {
903 ret = -EINVAL;
904 break;
905 }
906
907 if (copy_from_user(&new_set, datavp, sizeof(sigset_t))) {
908 ret = -EFAULT;
909 break;
910 }
911
912 sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
913
914 /*
915 * Every thread does recalc_sigpending() after resume, so
916 * retarget_shared_pending() and recalc_sigpending() are not
917 * called here.
918 */
919 spin_lock_irq(&child->sighand->siglock);
920 child->blocked = new_set;
921 spin_unlock_irq(&child->sighand->siglock);
922
923 ret = 0;
924 break;
925 }
926
fca26f26
TH
927 case PTRACE_INTERRUPT:
928 /*
929 * Stop tracee without any side-effect on signal or job
930 * control. At least one trap is guaranteed to happen
931 * after this request. If @child is already trapped, the
932 * current trap is not disturbed and another trap will
933 * happen after the current trap is ended with PTRACE_CONT.
934 *
935 * The actual trap might not be PTRACE_EVENT_STOP trap but
936 * the pending condition is cleared regardless.
937 */
938 if (unlikely(!seized || !lock_task_sighand(child, &flags)))
939 break;
940
544b2c91
TH
941 /*
942 * INTERRUPT doesn't disturb existing trap sans one
943 * exception. If ptracer issued LISTEN for the current
944 * STOP, this INTERRUPT should clear LISTEN and re-trap
945 * tracee into STOP.
946 */
fca26f26 947 if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP)))
910ffdb1 948 ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING);
544b2c91
TH
949
950 unlock_task_sighand(child, &flags);
951 ret = 0;
952 break;
953
954 case PTRACE_LISTEN:
955 /*
956 * Listen for events. Tracee must be in STOP. It's not
957 * resumed per-se but is not considered to be in TRACED by
958 * wait(2) or ptrace(2). If an async event (e.g. group
959 * stop state change) happens, tracee will enter STOP trap
960 * again. Alternatively, ptracer can issue INTERRUPT to
961 * finish listening and re-trap tracee into STOP.
962 */
963 if (unlikely(!seized || !lock_task_sighand(child, &flags)))
964 break;
965
966 si = child->last_siginfo;
f9d81f61
ON
967 if (likely(si && (si->si_code >> 8) == PTRACE_EVENT_STOP)) {
968 child->jobctl |= JOBCTL_LISTENING;
969 /*
970 * If NOTIFY is set, it means event happened between
971 * start of this trap and now. Trigger re-trap.
972 */
973 if (child->jobctl & JOBCTL_TRAP_NOTIFY)
910ffdb1 974 ptrace_signal_wake_up(child, true);
f9d81f61
ON
975 ret = 0;
976 }
fca26f26 977 unlock_task_sighand(child, &flags);
fca26f26
TH
978 break;
979
1bcf5482
AD
980 case PTRACE_DETACH: /* detach a process that was attached. */
981 ret = ptrace_detach(child, data);
982 break;
36df29d7 983
9c1a1259
MF
984#ifdef CONFIG_BINFMT_ELF_FDPIC
985 case PTRACE_GETFDPIC: {
e0129ef9 986 struct mm_struct *mm = get_task_mm(child);
9c1a1259
MF
987 unsigned long tmp = 0;
988
e0129ef9
ON
989 ret = -ESRCH;
990 if (!mm)
991 break;
992
9c1a1259
MF
993 switch (addr) {
994 case PTRACE_GETFDPIC_EXEC:
e0129ef9 995 tmp = mm->context.exec_fdpic_loadmap;
9c1a1259
MF
996 break;
997 case PTRACE_GETFDPIC_INTERP:
e0129ef9 998 tmp = mm->context.interp_fdpic_loadmap;
9c1a1259
MF
999 break;
1000 default:
1001 break;
1002 }
e0129ef9 1003 mmput(mm);
9c1a1259 1004
9fed81dc 1005 ret = put_user(tmp, datalp);
9c1a1259
MF
1006 break;
1007 }
1008#endif
1009
36df29d7
RM
1010#ifdef PTRACE_SINGLESTEP
1011 case PTRACE_SINGLESTEP:
1012#endif
5b88abbf
RM
1013#ifdef PTRACE_SINGLEBLOCK
1014 case PTRACE_SINGLEBLOCK:
1015#endif
36df29d7
RM
1016#ifdef PTRACE_SYSEMU
1017 case PTRACE_SYSEMU:
1018 case PTRACE_SYSEMU_SINGLESTEP:
1019#endif
1020 case PTRACE_SYSCALL:
1021 case PTRACE_CONT:
1022 return ptrace_resume(child, request, data);
1023
1024 case PTRACE_KILL:
1025 if (child->exit_state) /* already dead */
1026 return 0;
1027 return ptrace_resume(child, request, SIGKILL);
1028
2225a122
SS
1029#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
1030 case PTRACE_GETREGSET:
29000cae 1031 case PTRACE_SETREGSET: {
2225a122 1032 struct iovec kiov;
9fed81dc 1033 struct iovec __user *uiov = datavp;
2225a122
SS
1034
1035 if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
1036 return -EFAULT;
1037
1038 if (__get_user(kiov.iov_base, &uiov->iov_base) ||
1039 __get_user(kiov.iov_len, &uiov->iov_len))
1040 return -EFAULT;
1041
1042 ret = ptrace_regset(child, request, addr, &kiov);
1043 if (!ret)
1044 ret = __put_user(kiov.iov_len, &uiov->iov_len);
1045 break;
1046 }
1047#endif
f8e529ed
TA
1048
1049 case PTRACE_SECCOMP_GET_FILTER:
1050 ret = seccomp_get_filter(child, addr, datavp);
1051 break;
1052
1da177e4
LT
1053 default:
1054 break;
1055 }
1056
1057 return ret;
1058}
481bed45 1059
8053bdd5 1060static struct task_struct *ptrace_get_task_struct(pid_t pid)
6b9c7ed8
CH
1061{
1062 struct task_struct *child;
481bed45 1063
8053bdd5 1064 rcu_read_lock();
228ebcbe 1065 child = find_task_by_vpid(pid);
481bed45
CH
1066 if (child)
1067 get_task_struct(child);
8053bdd5 1068 rcu_read_unlock();
f400e198 1069
481bed45 1070 if (!child)
6b9c7ed8
CH
1071 return ERR_PTR(-ESRCH);
1072 return child;
481bed45
CH
1073}
1074
0ac15559
CH
1075#ifndef arch_ptrace_attach
1076#define arch_ptrace_attach(child) do { } while (0)
1077#endif
1078
4abf9869
NK
1079SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
1080 unsigned long, data)
481bed45
CH
1081{
1082 struct task_struct *child;
1083 long ret;
1084
6b9c7ed8
CH
1085 if (request == PTRACE_TRACEME) {
1086 ret = ptrace_traceme();
6ea6dd93
HS
1087 if (!ret)
1088 arch_ptrace_attach(current);
481bed45 1089 goto out;
6b9c7ed8
CH
1090 }
1091
1092 child = ptrace_get_task_struct(pid);
1093 if (IS_ERR(child)) {
1094 ret = PTR_ERR(child);
1095 goto out;
1096 }
481bed45 1097
3544d72a 1098 if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
aa9147c9 1099 ret = ptrace_attach(child, request, addr, data);
0ac15559
CH
1100 /*
1101 * Some architectures need to do book-keeping after
1102 * a ptrace attach.
1103 */
1104 if (!ret)
1105 arch_ptrace_attach(child);
005f18df 1106 goto out_put_task_struct;
481bed45
CH
1107 }
1108
fca26f26
TH
1109 ret = ptrace_check_attach(child, request == PTRACE_KILL ||
1110 request == PTRACE_INTERRUPT);
481bed45
CH
1111 if (ret < 0)
1112 goto out_put_task_struct;
1113
1114 ret = arch_ptrace(child, request, addr, data);
9899d11f
ON
1115 if (ret || request != PTRACE_DETACH)
1116 ptrace_unfreeze_traced(child);
481bed45
CH
1117
1118 out_put_task_struct:
1119 put_task_struct(child);
1120 out:
481bed45
CH
1121 return ret;
1122}
76647323 1123
4abf9869
NK
1124int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr,
1125 unsigned long data)
76647323
AD
1126{
1127 unsigned long tmp;
1128 int copied;
1129
1130 copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0);
1131 if (copied != sizeof(tmp))
1132 return -EIO;
1133 return put_user(tmp, (unsigned long __user *)data);
1134}
f284ce72 1135
4abf9869
NK
1136int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
1137 unsigned long data)
f284ce72
AD
1138{
1139 int copied;
1140
1141 copied = access_process_vm(tsk, addr, &data, sizeof(data), 1);
1142 return (copied == sizeof(data)) ? 0 : -EIO;
1143}
032d82d9 1144
96b8936a 1145#if defined CONFIG_COMPAT
032d82d9
RM
1146
1147int compat_ptrace_request(struct task_struct *child, compat_long_t request,
1148 compat_ulong_t addr, compat_ulong_t data)
1149{
1150 compat_ulong_t __user *datap = compat_ptr(data);
1151 compat_ulong_t word;
e16b2781 1152 siginfo_t siginfo;
032d82d9
RM
1153 int ret;
1154
1155 switch (request) {
1156 case PTRACE_PEEKTEXT:
1157 case PTRACE_PEEKDATA:
1158 ret = access_process_vm(child, addr, &word, sizeof(word), 0);
1159 if (ret != sizeof(word))
1160 ret = -EIO;
1161 else
1162 ret = put_user(word, datap);
1163 break;
1164
1165 case PTRACE_POKETEXT:
1166 case PTRACE_POKEDATA:
1167 ret = access_process_vm(child, addr, &data, sizeof(data), 1);
1168 ret = (ret != sizeof(data) ? -EIO : 0);
1169 break;
1170
1171 case PTRACE_GETEVENTMSG:
1172 ret = put_user((compat_ulong_t) child->ptrace_message, datap);
1173 break;
1174
e16b2781
RM
1175 case PTRACE_GETSIGINFO:
1176 ret = ptrace_getsiginfo(child, &siginfo);
1177 if (!ret)
1178 ret = copy_siginfo_to_user32(
1179 (struct compat_siginfo __user *) datap,
1180 &siginfo);
1181 break;
1182
1183 case PTRACE_SETSIGINFO:
1184 memset(&siginfo, 0, sizeof siginfo);
1185 if (copy_siginfo_from_user32(
1186 &siginfo, (struct compat_siginfo __user *) datap))
1187 ret = -EFAULT;
1188 else
1189 ret = ptrace_setsiginfo(child, &siginfo);
1190 break;
2225a122
SS
1191#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
1192 case PTRACE_GETREGSET:
1193 case PTRACE_SETREGSET:
1194 {
1195 struct iovec kiov;
1196 struct compat_iovec __user *uiov =
1197 (struct compat_iovec __user *) datap;
1198 compat_uptr_t ptr;
1199 compat_size_t len;
1200
1201 if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
1202 return -EFAULT;
1203
1204 if (__get_user(ptr, &uiov->iov_base) ||
1205 __get_user(len, &uiov->iov_len))
1206 return -EFAULT;
1207
1208 kiov.iov_base = compat_ptr(ptr);
1209 kiov.iov_len = len;
1210
1211 ret = ptrace_regset(child, request, addr, &kiov);
1212 if (!ret)
1213 ret = __put_user(kiov.iov_len, &uiov->iov_len);
1214 break;
1215 }
1216#endif
e16b2781 1217
032d82d9
RM
1218 default:
1219 ret = ptrace_request(child, request, addr, data);
1220 }
1221
1222 return ret;
1223}
c269f196 1224
62a6fa97
HC
1225COMPAT_SYSCALL_DEFINE4(ptrace, compat_long_t, request, compat_long_t, pid,
1226 compat_long_t, addr, compat_long_t, data)
c269f196
RM
1227{
1228 struct task_struct *child;
1229 long ret;
1230
c269f196
RM
1231 if (request == PTRACE_TRACEME) {
1232 ret = ptrace_traceme();
1233 goto out;
1234 }
1235
1236 child = ptrace_get_task_struct(pid);
1237 if (IS_ERR(child)) {
1238 ret = PTR_ERR(child);
1239 goto out;
1240 }
1241
3544d72a 1242 if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
aa9147c9 1243 ret = ptrace_attach(child, request, addr, data);
c269f196
RM
1244 /*
1245 * Some architectures need to do book-keeping after
1246 * a ptrace attach.
1247 */
1248 if (!ret)
1249 arch_ptrace_attach(child);
1250 goto out_put_task_struct;
1251 }
1252
fca26f26
TH
1253 ret = ptrace_check_attach(child, request == PTRACE_KILL ||
1254 request == PTRACE_INTERRUPT);
9899d11f 1255 if (!ret) {
c269f196 1256 ret = compat_arch_ptrace(child, request, addr, data);
9899d11f
ON
1257 if (ret || request != PTRACE_DETACH)
1258 ptrace_unfreeze_traced(child);
1259 }
c269f196
RM
1260
1261 out_put_task_struct:
1262 put_task_struct(child);
1263 out:
c269f196
RM
1264 return ret;
1265}
96b8936a 1266#endif /* CONFIG_COMPAT */