Blame view
kernel/ptrace.c
36.5 KB
457c89965
|
1 |
// SPDX-License-Identifier: GPL-2.0-only |
1da177e4c
|
2 3 4 5 6 7 8 9 |
/* * linux/kernel/ptrace.c * * (C) Copyright 1999 Linus Torvalds * * Common interfaces for "ptrace()" which we do not want * to continually duplicate across every architecture. */ |
c59ede7b7
|
10 |
#include <linux/capability.h> |
9984de1a5
|
11 |
#include <linux/export.h> |
1da177e4c
|
12 |
#include <linux/sched.h> |
6e84f3152
|
13 |
#include <linux/sched/mm.h> |
f7ccbae45
|
14 |
#include <linux/sched/coredump.h> |
299300258
|
15 |
#include <linux/sched/task.h> |
1da177e4c
|
16 17 18 19 |
#include <linux/errno.h> #include <linux/mm.h> #include <linux/highmem.h> #include <linux/pagemap.h> |
1da177e4c
|
20 21 |
#include <linux/ptrace.h> #include <linux/security.h> |
7ed20e1ad
|
22 |
#include <linux/signal.h> |
a27bb332c
|
23 |
#include <linux/uio.h> |
a5cb013da
|
24 |
#include <linux/audit.h> |
b488893a3
|
25 |
#include <linux/pid_namespace.h> |
f17d30a80
|
26 |
#include <linux/syscalls.h> |
3a7097035
|
27 |
#include <linux/uaccess.h> |
2225a122a
|
28 |
#include <linux/regset.h> |
bf26c0184
|
29 |
#include <linux/hw_breakpoint.h> |
f701e5b73
|
30 |
#include <linux/cn_proc.h> |
84c751bd4
|
31 |
#include <linux/compat.h> |
fcfc2aa01
|
32 |
#include <linux/sched/signal.h> |
1da177e4c
|
33 |
|
201766a20
|
34 |
#include <asm/syscall.h> /* for syscall_get_* */ |
84d77d3f0
|
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 |
/* * Access another process' address space via ptrace. * Source/target buffer must be kernel space, * Do not walk the page table directly, use get_user_pages */ int ptrace_access_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, unsigned int gup_flags) { struct mm_struct *mm; int ret; mm = get_task_mm(tsk); if (!mm) return 0; if (!tsk->ptrace || (current != tsk->parent) || ((get_dumpable(mm) != SUID_DUMP_USER) && !ptracer_capable(tsk, mm->user_ns))) { mmput(mm); return 0; } ret = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags); mmput(mm); return ret; } |
bf53de907
|
63 |
|
c70d9d809
|
64 65 66 67 68 69 70 71 |
void __ptrace_link(struct task_struct *child, struct task_struct *new_parent, const struct cred *ptracer_cred) { BUG_ON(!list_empty(&child->ptrace_entry)); list_add(&child->ptrace_entry, &new_parent->ptraced); child->parent = new_parent; child->ptracer_cred = get_cred(ptracer_cred); } |
bf53de907
|
72 |
/* |
1da177e4c
|
73 74 75 76 77 |
* ptrace a task: make the debugger its new parent and * move it to the ptrace list. * * Must be called with the tasklist lock write-held. */ |
c70d9d809
|
78 |
static void ptrace_link(struct task_struct *child, struct task_struct *new_parent) |
1da177e4c
|
79 |
{ |
6994eefb0
|
80 |
__ptrace_link(child, new_parent, current_cred()); |
1da177e4c
|
81 |
} |
3a7097035
|
82 |
|
e3bd058f6
|
83 84 85 |
/** * __ptrace_unlink - unlink ptracee and restore its execution state * @child: ptracee to be unlinked |
1da177e4c
|
86 |
* |
0e9f0a4ab
|
87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 |
* Remove @child from the ptrace list, move it back to the original parent, * and restore the execution state so that it conforms to the group stop * state. * * Unlinking can happen via two paths - explicit PTRACE_DETACH or ptracer * exiting. For PTRACE_DETACH, unless the ptracee has been killed between * ptrace_check_attach() and here, it's guaranteed to be in TASK_TRACED. * If the ptracer is exiting, the ptracee can be in any state. * * After detach, the ptracee should be in a state which conforms to the * group stop. If the group is stopped or in the process of stopping, the * ptracee should be put into TASK_STOPPED; otherwise, it should be woken * up from TASK_TRACED. * * If the ptracee is in TASK_TRACED and needs to be moved to TASK_STOPPED, * it goes through TRACED -> RUNNING -> STOPPED transition which is similar * to but in the opposite direction of what happens while attaching to a * stopped task. However, in this direction, the intermediate RUNNING * state is not hidden even from the current ptracer and if it immediately * re-attaches and performs a WNOHANG wait(2), it may fail. |
e3bd058f6
|
107 108 109 |
* * CONTEXT: * write_lock_irq(tasklist_lock) |
1da177e4c
|
110 |
*/ |
36c8b5868
|
111 |
void __ptrace_unlink(struct task_struct *child) |
1da177e4c
|
112 |
{ |
64b875f7a
|
113 |
const struct cred *old_cred; |
5ecfbae09
|
114 |
BUG_ON(!child->ptrace); |
0a5bf409d
|
115 |
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
15532fd6f
|
116 117 118 |
#ifdef TIF_SYSCALL_EMU clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); #endif |
0a5bf409d
|
119 |
|
f470021ad
|
120 121 |
child->parent = child->real_parent; list_del_init(&child->ptrace_entry); |
64b875f7a
|
122 123 124 |
old_cred = child->ptracer_cred; child->ptracer_cred = NULL; put_cred(old_cred); |
1da177e4c
|
125 |
|
1da177e4c
|
126 |
spin_lock(&child->sighand->siglock); |
1333ab031
|
127 |
child->ptrace = 0; |
0e9f0a4ab
|
128 |
/* |
73ddff2be
|
129 130 131 132 133 134 135 |
* Clear all pending traps and TRAPPING. TRAPPING should be * cleared regardless of JOBCTL_STOP_PENDING. Do it explicitly. */ task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK); task_clear_jobctl_trapping(child); /* |
a8f072c1d
|
136 |
* Reinstate JOBCTL_STOP_PENDING if group stop is in effect and |
0e9f0a4ab
|
137 138 139 140 |
* @child isn't dead. */ if (!(child->flags & PF_EXITING) && (child->signal->flags & SIGNAL_STOP_STOPPED || |
8a88951b5
|
141 |
child->signal->group_stop_count)) { |
a8f072c1d
|
142 |
child->jobctl |= JOBCTL_STOP_PENDING; |
0e9f0a4ab
|
143 |
|
8a88951b5
|
144 145 146 147 148 149 150 151 152 153 |
/* * This is only possible if this thread was cloned by the * traced task running in the stopped group, set the signal * for the future reports. * FIXME: we should change ptrace_init_task() to handle this * case. */ if (!(child->jobctl & JOBCTL_STOP_SIGMASK)) child->jobctl |= SIGSTOP; } |
0e9f0a4ab
|
154 155 156 157 158 159 |
/* * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick * @child in the butt. Note that @resume should be used iff @child * is in TASK_TRACED; otherwise, we might unduly disrupt * TASK_KILLABLE sleeps. */ |
a8f072c1d
|
160 |
if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child)) |
910ffdb18
|
161 |
ptrace_signal_wake_up(child, true); |
0e9f0a4ab
|
162 |
|
1da177e4c
|
163 |
spin_unlock(&child->sighand->siglock); |
1da177e4c
|
164 |
} |
9899d11f6
|
165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 |
/* Ensure that nothing can wake it up, even SIGKILL */ static bool ptrace_freeze_traced(struct task_struct *task) { bool ret = false; /* Lockless, nobody but us can set this flag */ if (task->jobctl & JOBCTL_LISTENING) return ret; spin_lock_irq(&task->sighand->siglock); if (task_is_traced(task) && !__fatal_signal_pending(task)) { task->state = __TASK_TRACED; ret = true; } spin_unlock_irq(&task->sighand->siglock); return ret; } static void ptrace_unfreeze_traced(struct task_struct *task) { if (task->state != __TASK_TRACED) return; WARN_ON(!task->ptrace || task->parent != current); |
5402e97af
|
190 191 192 193 |
/* * PTRACE_LISTEN can allow ptrace_trap_notify to wake us up remotely. * Recheck state under the lock to close this race. */ |
9899d11f6
|
194 |
spin_lock_irq(&task->sighand->siglock); |
5402e97af
|
195 196 197 198 199 200 |
if (task->state == __TASK_TRACED) { if (__fatal_signal_pending(task)) wake_up_state(task, __TASK_TRACED); else task->state = TASK_TRACED; } |
9899d11f6
|
201 202 |
spin_unlock_irq(&task->sighand->siglock); } |
755e276b3
|
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 |
/** * ptrace_check_attach - check whether ptracee is ready for ptrace operation * @child: ptracee to check for * @ignore_state: don't check whether @child is currently %TASK_TRACED * * Check whether @child is being ptraced by %current and ready for further * ptrace operations. If @ignore_state is %false, @child also should be in * %TASK_TRACED state and on return the child is guaranteed to be traced * and not executing. If @ignore_state is %true, @child can be in any * state. * * CONTEXT: * Grabs and releases tasklist_lock and @child->sighand->siglock. * * RETURNS: * 0 on success, -ESRCH if %child is not ready. |
1da177e4c
|
219 |
*/ |
edea0d03e
|
220 |
static int ptrace_check_attach(struct task_struct *child, bool ignore_state) |
1da177e4c
|
221 222 223 224 225 226 227 228 229 230 231 |
{ int ret = -ESRCH; /* * We take the read lock around doing both checks to close a * possible race where someone else was tracing our child and * detached between these two checks. After this locked check, * we are sure that this is our traced child and that can only * be changed by us so it's not changing right after this. */ read_lock(&tasklist_lock); |
9899d11f6
|
232 233 |
if (child->ptrace && child->parent == current) { WARN_ON(child->state == __TASK_TRACED); |
c0c0b649d
|
234 235 236 237 |
/* * child->sighand can't be NULL, release_task() * does ptrace_unlink() before __exit_signal(). */ |
9899d11f6
|
238 |
if (ignore_state || ptrace_freeze_traced(child)) |
321fb5619
|
239 |
ret = 0; |
1da177e4c
|
240 241 |
} read_unlock(&tasklist_lock); |
9899d11f6
|
242 243 244 245 246 247 248 249 250 251 252 |
if (!ret && !ignore_state) { if (!wait_task_inactive(child, __TASK_TRACED)) { /* * This can only happen if may_ptrace_stop() fails and * ptrace_stop() changes ->state back to TASK_RUNNING, * so we should not worry about leaking __TASK_TRACED. */ WARN_ON(child->state == __TASK_TRACED); ret = -ESRCH; } } |
1da177e4c
|
253 |
|
1da177e4c
|
254 255 |
return ret; } |
a26a63588
|
256 257 |
static bool ptrace_has_cap(const struct cred *cred, struct user_namespace *ns, unsigned int mode) |
69f594a38
|
258 |
{ |
a26a63588
|
259 |
int ret; |
69f594a38
|
260 |
if (mode & PTRACE_MODE_NOAUDIT) |
a26a63588
|
261 |
ret = security_capable(cred, ns, CAP_SYS_PTRACE, CAP_OPT_NOAUDIT); |
69f594a38
|
262 |
else |
a26a63588
|
263 264 265 |
ret = security_capable(cred, ns, CAP_SYS_PTRACE, CAP_OPT_NONE); return ret == 0; |
69f594a38
|
266 |
} |
9f99798ff
|
267 268 |
/* Returns 0 on success, -errno on denial. */ static int __ptrace_may_access(struct task_struct *task, unsigned int mode) |
ab8d11beb
|
269 |
{ |
c69e8d9c0
|
270 |
const struct cred *cred = current_cred(), *tcred; |
bfedb5892
|
271 |
struct mm_struct *mm; |
caaee6234
|
272 273 274 275 276 277 278 279 |
kuid_t caller_uid; kgid_t caller_gid; if (!(mode & PTRACE_MODE_FSCREDS) == !(mode & PTRACE_MODE_REALCREDS)) { WARN(1, "denying ptrace access check without PTRACE_MODE_*CREDS "); return -EPERM; } |
b6dff3ec5
|
280 |
|
df26c40e5
|
281 282 283 284 285 286 287 288 |
/* May we inspect the given task? * This check is used both for attaching with ptrace * and for allowing access to sensitive information in /proc. * * ptrace_attach denies several cases that /proc allows * because setting up the necessary parent/child relationship * or halting the specified task is impossible. */ |
caaee6234
|
289 |
|
df26c40e5
|
290 |
/* Don't let security modules deny introspection */ |
73af963f9
|
291 |
if (same_thread_group(task, current)) |
df26c40e5
|
292 |
return 0; |
c69e8d9c0
|
293 |
rcu_read_lock(); |
caaee6234
|
294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 |
if (mode & PTRACE_MODE_FSCREDS) { caller_uid = cred->fsuid; caller_gid = cred->fsgid; } else { /* * Using the euid would make more sense here, but something * in userland might rely on the old behavior, and this * shouldn't be a security problem since * PTRACE_MODE_REALCREDS implies that the caller explicitly * used a syscall that requests access to another process * (and not a filesystem syscall to procfs). */ caller_uid = cred->uid; caller_gid = cred->gid; } |
c69e8d9c0
|
309 |
tcred = __task_cred(task); |
caaee6234
|
310 311 312 313 314 315 |
if (uid_eq(caller_uid, tcred->euid) && uid_eq(caller_uid, tcred->suid) && uid_eq(caller_uid, tcred->uid) && gid_eq(caller_gid, tcred->egid) && gid_eq(caller_gid, tcred->sgid) && gid_eq(caller_gid, tcred->gid)) |
8409cca70
|
316 |
goto ok; |
a26a63588
|
317 |
if (ptrace_has_cap(cred, tcred->user_ns, mode)) |
8409cca70
|
318 319 320 321 |
goto ok; rcu_read_unlock(); return -EPERM; ok: |
c69e8d9c0
|
322 |
rcu_read_unlock(); |
f6581f5b5
|
323 324 325 326 327 328 329 330 331 332 |
/* * If a task drops privileges and becomes nondumpable (through a syscall * like setresuid()) while we are trying to access it, we must ensure * that the dumpability is read after the credentials; otherwise, * we may be able to attach to a task that we shouldn't be able to * attach to (as if the task had dropped privileges without becoming * nondumpable). * Pairs with a write barrier in commit_creds(). */ smp_rmb(); |
bfedb5892
|
333 334 335 |
mm = task->mm; if (mm && ((get_dumpable(mm) != SUID_DUMP_USER) && |
a26a63588
|
336 |
!ptrace_has_cap(cred, mm->user_ns, mode))) |
bfedb5892
|
337 |
return -EPERM; |
ab8d11beb
|
338 |
|
9e48858f7
|
339 |
return security_ptrace_access_check(task, mode); |
ab8d11beb
|
340 |
} |
006ebb40d
|
341 |
bool ptrace_may_access(struct task_struct *task, unsigned int mode) |
ab8d11beb
|
342 343 344 |
{ int err; task_lock(task); |
006ebb40d
|
345 |
err = __ptrace_may_access(task, mode); |
ab8d11beb
|
346 |
task_unlock(task); |
3a7097035
|
347 |
return !err; |
ab8d11beb
|
348 |
} |
3544d72a0
|
349 |
static int ptrace_attach(struct task_struct *task, long request, |
aa9147c98
|
350 |
unsigned long addr, |
3544d72a0
|
351 |
unsigned long flags) |
1da177e4c
|
352 |
{ |
3544d72a0
|
353 |
bool seize = (request == PTRACE_SEIZE); |
1da177e4c
|
354 |
int retval; |
f5b40e363
|
355 |
|
3544d72a0
|
356 |
retval = -EIO; |
aa9147c98
|
357 358 359 |
if (seize) { if (addr != 0) goto out; |
aa9147c98
|
360 361 362 363 364 365 |
if (flags & ~(unsigned long)PTRACE_O_MASK) goto out; flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT); } else { flags = PT_PTRACED; } |
3544d72a0
|
366 |
|
a5cb013da
|
367 |
audit_ptrace(task); |
1da177e4c
|
368 |
retval = -EPERM; |
b79b7ba93
|
369 370 |
if (unlikely(task->flags & PF_KTHREAD)) goto out; |
bac0abd61
|
371 |
if (same_thread_group(task, current)) |
f5b40e363
|
372 |
goto out; |
f2f0b00ad
|
373 374 |
/* * Protect exec's credential calculations against our interference; |
86b6c1f30
|
375 |
* SUID, SGID and LSM creds get determined differently |
5e751e992
|
376 |
* under ptrace. |
d84f4f992
|
377 |
*/ |
793285fca
|
378 |
retval = -ERESTARTNOINTR; |
9b1bf12d5
|
379 |
if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) |
d84f4f992
|
380 |
goto out; |
f5b40e363
|
381 |
|
4b105cbba
|
382 |
task_lock(task); |
caaee6234
|
383 |
retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS); |
4b105cbba
|
384 |
task_unlock(task); |
1da177e4c
|
385 |
if (retval) |
4b105cbba
|
386 |
goto unlock_creds; |
1da177e4c
|
387 |
|
4b105cbba
|
388 |
write_lock_irq(&tasklist_lock); |
b79b7ba93
|
389 390 |
retval = -EPERM; if (unlikely(task->exit_state)) |
4b105cbba
|
391 |
goto unlock_tasklist; |
f2f0b00ad
|
392 |
if (task->ptrace) |
4b105cbba
|
393 |
goto unlock_tasklist; |
b79b7ba93
|
394 |
|
3544d72a0
|
395 |
if (seize) |
aa9147c98
|
396 |
flags |= PT_SEIZED; |
aa9147c98
|
397 |
task->ptrace = flags; |
1da177e4c
|
398 |
|
c70d9d809
|
399 |
ptrace_link(task, current); |
3544d72a0
|
400 401 402 |
/* SEIZE doesn't trap tracee on attach */ if (!seize) |
079b22dc9
|
403 |
send_sig_info(SIGSTOP, SEND_SIG_PRIV, task); |
b79b7ba93
|
404 |
|
d79fdd6d9
|
405 406 407 |
spin_lock(&task->sighand->siglock); /* |
73ddff2be
|
408 |
* If the task is already STOPPED, set JOBCTL_TRAP_STOP and |
d79fdd6d9
|
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 |
* TRAPPING, and kick it so that it transits to TRACED. TRAPPING * will be cleared if the child completes the transition or any * event which clears the group stop states happens. We'll wait * for the transition to complete before returning from this * function. * * This hides STOPPED -> RUNNING -> TRACED transition from the * attaching thread but a different thread in the same group can * still observe the transient RUNNING state. IOW, if another * thread's WNOHANG wait(2) on the stopped tracee races against * ATTACH, the wait(2) may fail due to the transient RUNNING. * * The following task_is_stopped() test is safe as both transitions * in and out of STOPPED are protected by siglock. */ |
7dd3db54e
|
424 |
if (task_is_stopped(task) && |
73ddff2be
|
425 |
task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) |
910ffdb18
|
426 |
signal_wake_up_state(task, __TASK_STOPPED); |
d79fdd6d9
|
427 428 |
spin_unlock(&task->sighand->siglock); |
b79b7ba93
|
429 |
retval = 0; |
4b105cbba
|
430 431 432 |
unlock_tasklist: write_unlock_irq(&tasklist_lock); unlock_creds: |
9b1bf12d5
|
433 |
mutex_unlock(&task->signal->cred_guard_mutex); |
f5b40e363
|
434 |
out: |
f701e5b73
|
435 |
if (!retval) { |
7c3b00e06
|
436 437 438 439 440 441 442 443 |
/* * We do not bother to change retval or clear JOBCTL_TRAPPING * if wait_on_bit() was interrupted by SIGKILL. The tracer will * not return to user-mode, it will exit and clear this bit in * __ptrace_unlink() if it wasn't already cleared by the tracee; * and until then nobody can ptrace this task. */ wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, TASK_KILLABLE); |
f701e5b73
|
444 445 |
proc_ptrace_connector(task, PTRACE_ATTACH); } |
1da177e4c
|
446 447 |
return retval; } |
f2f0b00ad
|
448 449 450 451 452 453 |
/** * ptrace_traceme -- helper for PTRACE_TRACEME * * Performs checks and sets PT_PTRACED. * Should be used by all ptrace implementations for PTRACE_TRACEME. */ |
e3e89cc53
|
454 |
static int ptrace_traceme(void) |
f2f0b00ad
|
455 456 |
{ int ret = -EPERM; |
4b105cbba
|
457 458 |
write_lock_irq(&tasklist_lock); /* Are we already being traced? */ |
f2f0b00ad
|
459 |
if (!current->ptrace) { |
f2f0b00ad
|
460 |
ret = security_ptrace_traceme(current->parent); |
f2f0b00ad
|
461 462 463 464 465 466 467 |
/* * Check PF_EXITING to ensure ->real_parent has not passed * exit_ptrace(). Otherwise we don't report the error but * pretend ->real_parent untraces us right after return. */ if (!ret && !(current->real_parent->flags & PF_EXITING)) { current->ptrace = PT_PTRACED; |
c70d9d809
|
468 |
ptrace_link(current, current->real_parent); |
f2f0b00ad
|
469 |
} |
f2f0b00ad
|
470 |
} |
4b105cbba
|
471 |
write_unlock_irq(&tasklist_lock); |
f2f0b00ad
|
472 473 |
return ret; } |
39c626ae4
|
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
/* * Called with irqs disabled, returns true if childs should reap themselves. */ static int ignoring_children(struct sighand_struct *sigh) { int ret; spin_lock(&sigh->siglock); ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) || (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT); spin_unlock(&sigh->siglock); return ret; } /* * Called with tasklist_lock held for writing. * Unlink a traced task, and clean it up if it was a traced zombie. * Return true if it needs to be reaped with release_task(). * (We can't call release_task() here because we already hold tasklist_lock.) * * If it's a zombie, our attachedness prevented normal parent notification * or self-reaping. Do notification now if it would have happened earlier. * If it should reap itself, return true. * |
a7f0765ed
|
497 498 499 500 |
* If it's our own child, there is no notification to do. But if our normal * children self-reap, then this child was prevented by ptrace and we must * reap it now, in that case we must also wake up sub-threads sleeping in * do_wait(). |
39c626ae4
|
501 502 503 |
*/ static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) { |
9843a1e97
|
504 |
bool dead; |
39c626ae4
|
505 |
__ptrace_unlink(p); |
9843a1e97
|
506 507 508 509 510 511 512 513 514 515 |
if (p->exit_state != EXIT_ZOMBIE) return false; dead = !thread_group_leader(p); if (!dead && thread_group_empty(p)) { if (!same_thread_group(p->real_parent, tracer)) dead = do_notify_parent(p, p->exit_signal); else if (ignoring_children(tracer->sighand)) { __wake_up_parent(p, tracer); |
9843a1e97
|
516 |
dead = true; |
39c626ae4
|
517 518 |
} } |
9843a1e97
|
519 520 521 522 |
/* Mark it as in the process of being reaped. */ if (dead) p->exit_state = EXIT_DEAD; return dead; |
39c626ae4
|
523 |
} |
e3e89cc53
|
524 |
static int ptrace_detach(struct task_struct *child, unsigned int data) |
1da177e4c
|
525 |
{ |
7ed20e1ad
|
526 |
if (!valid_signal(data)) |
5ecfbae09
|
527 |
return -EIO; |
1da177e4c
|
528 529 530 |
/* Architecture-specific hardware disable .. */ ptrace_disable(child); |
95c3eb76d
|
531 |
write_lock_irq(&tasklist_lock); |
39c626ae4
|
532 |
/* |
64a4096c5
|
533 534 |
* We rely on ptrace_freeze_traced(). It can't be killed and * untraced by another thread, it can't be a zombie. |
39c626ae4
|
535 |
*/ |
64a4096c5
|
536 537 538 539 540 541 542 |
WARN_ON(!child->ptrace || child->exit_state); /* * tasklist_lock avoids the race with wait_task_stopped(), see * the comment in ptrace_resume(). */ child->exit_code = data; __ptrace_detach(current, child); |
1da177e4c
|
543 |
write_unlock_irq(&tasklist_lock); |
f701e5b73
|
544 |
proc_ptrace_connector(child, PTRACE_DETACH); |
4576145c1
|
545 |
|
1da177e4c
|
546 547 |
return 0; } |
39c626ae4
|
548 |
/* |
c7e49c148
|
549 |
* Detach all tasks we were using ptrace on. Called with tasklist held |
7c8bd2322
|
550 |
* for writing. |
39c626ae4
|
551 |
*/ |
7c8bd2322
|
552 |
void exit_ptrace(struct task_struct *tracer, struct list_head *dead) |
39c626ae4
|
553 554 |
{ struct task_struct *p, *n; |
c7e49c148
|
555 |
|
39c626ae4
|
556 |
list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { |
992fb6e17
|
557 |
if (unlikely(p->ptrace & PT_EXITKILL)) |
079b22dc9
|
558 |
send_sig_info(SIGKILL, SEND_SIG_PRIV, p); |
992fb6e17
|
559 |
|
39c626ae4
|
560 |
if (__ptrace_detach(tracer, p)) |
7c8bd2322
|
561 |
list_add(&p->ptrace_entry, dead); |
39c626ae4
|
562 563 |
} } |
1da177e4c
|
564 565 566 567 568 569 570 571 572 |
int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) { int copied = 0; while (len > 0) { char buf[128]; int this_len, retval; this_len = (len > sizeof(buf)) ? sizeof(buf) : len; |
84d77d3f0
|
573 |
retval = ptrace_access_vm(tsk, src, buf, this_len, FOLL_FORCE); |
1da177e4c
|
574 575 576 577 578 579 580 581 582 583 |
if (!retval) { if (copied) break; return -EIO; } if (copy_to_user(dst, buf, retval)) return -EFAULT; copied += retval; src += retval; dst += retval; |
3a7097035
|
584 |
len -= retval; |
1da177e4c
|
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 |
} return copied; } int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len) { int copied = 0; while (len > 0) { char buf[128]; int this_len, retval; this_len = (len > sizeof(buf)) ? sizeof(buf) : len; if (copy_from_user(buf, src, this_len)) return -EFAULT; |
84d77d3f0
|
600 |
retval = ptrace_access_vm(tsk, dst, buf, this_len, |
f307ab6dc
|
601 |
FOLL_FORCE | FOLL_WRITE); |
1da177e4c
|
602 603 604 605 606 607 608 609 |
if (!retval) { if (copied) break; return -EIO; } copied += retval; src += retval; dst += retval; |
3a7097035
|
610 |
len -= retval; |
1da177e4c
|
611 612 613 |
} return copied; } |
4abf98696
|
614 |
static int ptrace_setoptions(struct task_struct *child, unsigned long data) |
1da177e4c
|
615 |
{ |
86b6c1f30
|
616 |
unsigned flags; |
8c5cf9e5c
|
617 618 |
if (data & ~(unsigned long)PTRACE_O_MASK) return -EINVAL; |
13c4a9011
|
619 |
if (unlikely(data & PTRACE_O_SUSPEND_SECCOMP)) { |
97f2645f3
|
620 621 |
if (!IS_ENABLED(CONFIG_CHECKPOINT_RESTORE) || !IS_ENABLED(CONFIG_SECCOMP)) |
13c4a9011
|
622 623 624 625 626 627 628 629 630 |
return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (seccomp_mode(¤t->seccomp) != SECCOMP_MODE_DISABLED || current->ptrace & PT_SUSPEND_SECCOMP) return -EPERM; } |
86b6c1f30
|
631 632 633 634 635 |
/* Avoid intermediate state when all opts are cleared */ flags = child->ptrace; flags &= ~(PTRACE_O_MASK << PT_OPT_FLAG_SHIFT); flags |= (data << PT_OPT_FLAG_SHIFT); child->ptrace = flags; |
1da177e4c
|
636 |
|
8c5cf9e5c
|
637 |
return 0; |
1da177e4c
|
638 |
} |
ae7795bc6
|
639 |
static int ptrace_getsiginfo(struct task_struct *child, kernel_siginfo_t *info) |
1da177e4c
|
640 |
{ |
e49612544
|
641 |
unsigned long flags; |
1da177e4c
|
642 |
int error = -ESRCH; |
e49612544
|
643 |
if (lock_task_sighand(child, &flags)) { |
1da177e4c
|
644 |
error = -EINVAL; |
1da177e4c
|
645 |
if (likely(child->last_siginfo != NULL)) { |
0752d7bf6
|
646 |
copy_siginfo(info, child->last_siginfo); |
1da177e4c
|
647 648 |
error = 0; } |
e49612544
|
649 |
unlock_task_sighand(child, &flags); |
1da177e4c
|
650 |
} |
1da177e4c
|
651 652 |
return error; } |
ae7795bc6
|
653 |
static int ptrace_setsiginfo(struct task_struct *child, const kernel_siginfo_t *info) |
1da177e4c
|
654 |
{ |
e49612544
|
655 |
unsigned long flags; |
1da177e4c
|
656 |
int error = -ESRCH; |
e49612544
|
657 |
if (lock_task_sighand(child, &flags)) { |
1da177e4c
|
658 |
error = -EINVAL; |
1da177e4c
|
659 |
if (likely(child->last_siginfo != NULL)) { |
0752d7bf6
|
660 |
copy_siginfo(child->last_siginfo, info); |
1da177e4c
|
661 662 |
error = 0; } |
e49612544
|
663 |
unlock_task_sighand(child, &flags); |
1da177e4c
|
664 |
} |
1da177e4c
|
665 666 |
return error; } |
84c751bd4
|
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 |
static int ptrace_peek_siginfo(struct task_struct *child, unsigned long addr, unsigned long data) { struct ptrace_peeksiginfo_args arg; struct sigpending *pending; struct sigqueue *q; int ret, i; ret = copy_from_user(&arg, (void __user *) addr, sizeof(struct ptrace_peeksiginfo_args)); if (ret) return -EFAULT; if (arg.flags & ~PTRACE_PEEKSIGINFO_SHARED) return -EINVAL; /* unknown flags */ if (arg.nr < 0) return -EINVAL; |
f6e2aa91a
|
686 687 688 |
/* Ensure arg.off fits in an unsigned long */ if (arg.off > ULONG_MAX) return 0; |
84c751bd4
|
689 690 691 692 693 694 |
if (arg.flags & PTRACE_PEEKSIGINFO_SHARED) pending = &child->signal->shared_pending; else pending = &child->pending; for (i = 0; i < arg.nr; ) { |
ae7795bc6
|
695 |
kernel_siginfo_t info; |
f6e2aa91a
|
696 697 |
unsigned long off = arg.off + i; bool found = false; |
84c751bd4
|
698 699 700 701 |
spin_lock_irq(&child->sighand->siglock); list_for_each_entry(q, &pending->list, list) { if (!off--) { |
f6e2aa91a
|
702 |
found = true; |
84c751bd4
|
703 704 705 706 707 |
copy_siginfo(&info, &q->info); break; } } spin_unlock_irq(&child->sighand->siglock); |
f6e2aa91a
|
708 |
if (!found) /* beyond the end of the list */ |
84c751bd4
|
709 710 711 |
break; #ifdef CONFIG_COMPAT |
5c465217a
|
712 |
if (unlikely(in_compat_syscall())) { |
84c751bd4
|
713 |
compat_siginfo_t __user *uinfo = compat_ptr(data); |
cc731525f
|
714 |
if (copy_siginfo_to_user32(uinfo, &info)) { |
706b23bde
|
715 716 717 |
ret = -EFAULT; break; } |
84c751bd4
|
718 719 720 721 |
} else #endif { siginfo_t __user *uinfo = (siginfo_t __user *) data; |
cc731525f
|
722 |
if (copy_siginfo_to_user(uinfo, &info)) { |
706b23bde
|
723 724 725 |
ret = -EFAULT; break; } |
84c751bd4
|
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 |
} data += sizeof(siginfo_t); i++; if (signal_pending(current)) break; cond_resched(); } if (i > 0) return i; return ret; } |
36df29d79
|
742 743 744 745 746 747 |
#ifdef PTRACE_SINGLESTEP #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) #else #define is_singlestep(request) 0 #endif |
5b88abbf7
|
748 749 750 751 752 |
#ifdef PTRACE_SINGLEBLOCK #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) #else #define is_singleblock(request) 0 #endif |
36df29d79
|
753 754 755 756 757 |
#ifdef PTRACE_SYSEMU #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) #else #define is_sysemu_singlestep(request) 0 #endif |
4abf98696
|
758 759 |
static int ptrace_resume(struct task_struct *child, long request, unsigned long data) |
36df29d79
|
760 |
{ |
b72c18699
|
761 |
bool need_siglock; |
36df29d79
|
762 763 764 765 766 767 768 769 770 771 772 773 774 775 |
if (!valid_signal(data)) return -EIO; if (request == PTRACE_SYSCALL) set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); else clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); #ifdef TIF_SYSCALL_EMU if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP) set_tsk_thread_flag(child, TIF_SYSCALL_EMU); else clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); #endif |
5b88abbf7
|
776 777 778 779 780 |
if (is_singleblock(request)) { if (unlikely(!arch_has_block_step())) return -EIO; user_enable_block_step(child); } else if (is_singlestep(request) || is_sysemu_singlestep(request)) { |
36df29d79
|
781 782 783 |
if (unlikely(!arch_has_single_step())) return -EIO; user_enable_single_step(child); |
3a7097035
|
784 |
} else { |
36df29d79
|
785 |
user_disable_single_step(child); |
3a7097035
|
786 |
} |
36df29d79
|
787 |
|
b72c18699
|
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 |
/* * Change ->exit_code and ->state under siglock to avoid the race * with wait_task_stopped() in between; a non-zero ->exit_code will * wrongly look like another report from tracee. * * Note that we need siglock even if ->exit_code == data and/or this * status was not reported yet, the new status must not be cleared by * wait_task_stopped() after resume. * * If data == 0 we do not care if wait_task_stopped() reports the old * status and clears the code too; this can't race with the tracee, it * takes siglock after resume. */ need_siglock = data && !thread_group_empty(current); if (need_siglock) spin_lock_irq(&child->sighand->siglock); |
36df29d79
|
804 |
child->exit_code = data; |
0666fb51b
|
805 |
wake_up_state(child, __TASK_TRACED); |
b72c18699
|
806 807 |
if (need_siglock) spin_unlock_irq(&child->sighand->siglock); |
36df29d79
|
808 809 810 |
return 0; } |
2225a122a
|
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK static const struct user_regset * find_regset(const struct user_regset_view *view, unsigned int type) { const struct user_regset *regset; int n; for (n = 0; n < view->n; ++n) { regset = view->regsets + n; if (regset->core_note_type == type) return regset; } return NULL; } static int ptrace_regset(struct task_struct *task, int req, unsigned int type, struct iovec *kiov) { const struct user_regset_view *view = task_user_regset_view(task); const struct user_regset *regset = find_regset(view, type); int regset_no; if (!regset || (kiov->iov_len % regset->size) != 0) |
c6a0dd7ec
|
836 |
return -EINVAL; |
2225a122a
|
837 838 839 840 841 842 843 844 845 846 847 848 |
regset_no = regset - view->regsets; kiov->iov_len = min(kiov->iov_len, (__kernel_size_t) (regset->n * regset->size)); if (req == PTRACE_GETREGSET) return copy_regset_to_user(task, view, regset_no, 0, kiov->iov_len, kiov->iov_base); else return copy_regset_from_user(task, view, regset_no, 0, kiov->iov_len, kiov->iov_base); } |
e8440c145
|
849 850 851 852 853 854 |
/* * This is declared in linux/regset.h and defined in machine-dependent * code. We put the export here, near the primary machine-neutral use, * to ensure no machine forgets it. */ EXPORT_SYMBOL_GPL(task_user_regset_view); |
201766a20
|
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 |
static unsigned long ptrace_get_syscall_info_entry(struct task_struct *child, struct pt_regs *regs, struct ptrace_syscall_info *info) { unsigned long args[ARRAY_SIZE(info->entry.args)]; int i; info->op = PTRACE_SYSCALL_INFO_ENTRY; info->entry.nr = syscall_get_nr(child, regs); syscall_get_arguments(child, regs, args); for (i = 0; i < ARRAY_SIZE(args); i++) info->entry.args[i] = args[i]; /* args is the last field in struct ptrace_syscall_info.entry */ return offsetofend(struct ptrace_syscall_info, entry.args); } static unsigned long ptrace_get_syscall_info_seccomp(struct task_struct *child, struct pt_regs *regs, struct ptrace_syscall_info *info) { /* * As struct ptrace_syscall_info.entry is currently a subset * of struct ptrace_syscall_info.seccomp, it makes sense to * initialize that subset using ptrace_get_syscall_info_entry(). * This can be reconsidered in the future if these structures * diverge significantly enough. */ ptrace_get_syscall_info_entry(child, regs, info); info->op = PTRACE_SYSCALL_INFO_SECCOMP; info->seccomp.ret_data = child->ptrace_message; /* ret_data is the last field in struct ptrace_syscall_info.seccomp */ return offsetofend(struct ptrace_syscall_info, seccomp.ret_data); } static unsigned long ptrace_get_syscall_info_exit(struct task_struct *child, struct pt_regs *regs, struct ptrace_syscall_info *info) { info->op = PTRACE_SYSCALL_INFO_EXIT; info->exit.rval = syscall_get_error(child, regs); info->exit.is_error = !!info->exit.rval; if (!info->exit.is_error) info->exit.rval = syscall_get_return_value(child, regs); /* is_error is the last field in struct ptrace_syscall_info.exit */ return offsetofend(struct ptrace_syscall_info, exit.is_error); } static int ptrace_get_syscall_info(struct task_struct *child, unsigned long user_size, void __user *datavp) { struct pt_regs *regs = task_pt_regs(child); struct ptrace_syscall_info info = { .op = PTRACE_SYSCALL_INFO_NONE, .arch = syscall_get_arch(child), .instruction_pointer = instruction_pointer(regs), .stack_pointer = user_stack_pointer(regs), }; unsigned long actual_size = offsetof(struct ptrace_syscall_info, entry); unsigned long write_size; /* * This does not need lock_task_sighand() to access * child->last_siginfo because ptrace_freeze_traced() * called earlier by ptrace_check_attach() ensures that * the tracee cannot go away and clear its last_siginfo. */ switch (child->last_siginfo ? child->last_siginfo->si_code : 0) { case SIGTRAP | 0x80: switch (child->ptrace_message) { case PTRACE_EVENTMSG_SYSCALL_ENTRY: actual_size = ptrace_get_syscall_info_entry(child, regs, &info); break; case PTRACE_EVENTMSG_SYSCALL_EXIT: actual_size = ptrace_get_syscall_info_exit(child, regs, &info); break; } break; case SIGTRAP | (PTRACE_EVENT_SECCOMP << 8): actual_size = ptrace_get_syscall_info_seccomp(child, regs, &info); break; } write_size = min(actual_size, user_size); return copy_to_user(datavp, &info, write_size) ? -EFAULT : actual_size; } #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ |
2225a122a
|
949 |
|
1da177e4c
|
950 |
int ptrace_request(struct task_struct *child, long request, |
4abf98696
|
951 |
unsigned long addr, unsigned long data) |
1da177e4c
|
952 |
{ |
fca26f260
|
953 |
bool seized = child->ptrace & PT_SEIZED; |
1da177e4c
|
954 |
int ret = -EIO; |
ae7795bc6
|
955 |
kernel_siginfo_t siginfo, *si; |
9fed81dc4
|
956 957 |
void __user *datavp = (void __user *) data; unsigned long __user *datalp = datavp; |
fca26f260
|
958 |
unsigned long flags; |
1da177e4c
|
959 960 |
switch (request) { |
16c3e389e
|
961 962 963 964 965 966 |
case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: return generic_ptrace_peekdata(child, addr, data); case PTRACE_POKETEXT: case PTRACE_POKEDATA: return generic_ptrace_pokedata(child, addr, data); |
1da177e4c
|
967 968 969 970 971 972 973 |
#ifdef PTRACE_OLDSETOPTIONS case PTRACE_OLDSETOPTIONS: #endif case PTRACE_SETOPTIONS: ret = ptrace_setoptions(child, data); break; case PTRACE_GETEVENTMSG: |
9fed81dc4
|
974 |
ret = put_user(child->ptrace_message, datalp); |
1da177e4c
|
975 |
break; |
e16b27816
|
976 |
|
84c751bd4
|
977 978 979 |
case PTRACE_PEEKSIGINFO: ret = ptrace_peek_siginfo(child, addr, data); break; |
1da177e4c
|
980 |
case PTRACE_GETSIGINFO: |
e16b27816
|
981 982 |
ret = ptrace_getsiginfo(child, &siginfo); if (!ret) |
9fed81dc4
|
983 |
ret = copy_siginfo_to_user(datavp, &siginfo); |
1da177e4c
|
984 |
break; |
e16b27816
|
985 |
|
1da177e4c
|
986 |
case PTRACE_SETSIGINFO: |
4cd2e0e70
|
987 988 |
ret = copy_siginfo_from_user(&siginfo, datavp); if (!ret) |
e16b27816
|
989 |
ret = ptrace_setsiginfo(child, &siginfo); |
1da177e4c
|
990 |
break; |
e16b27816
|
991 |
|
fcfc2aa01
|
992 993 |
case PTRACE_GETSIGMASK: { sigset_t *mask; |
29000caec
|
994 995 996 997 |
if (addr != sizeof(sigset_t)) { ret = -EINVAL; break; } |
fcfc2aa01
|
998 999 1000 1001 1002 1003 |
if (test_tsk_restore_sigmask(child)) mask = &child->saved_sigmask; else mask = &child->blocked; if (copy_to_user(datavp, mask, sizeof(sigset_t))) |
29000caec
|
1004 1005 1006 1007 1008 |
ret = -EFAULT; else ret = 0; break; |
fcfc2aa01
|
1009 |
} |
29000caec
|
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 |
case PTRACE_SETSIGMASK: { sigset_t new_set; if (addr != sizeof(sigset_t)) { ret = -EINVAL; break; } if (copy_from_user(&new_set, datavp, sizeof(sigset_t))) { ret = -EFAULT; break; } sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP)); /* * Every thread does recalc_sigpending() after resume, so * retarget_shared_pending() and recalc_sigpending() are not * called here. */ spin_lock_irq(&child->sighand->siglock); child->blocked = new_set; spin_unlock_irq(&child->sighand->siglock); |
fcfc2aa01
|
1034 |
clear_tsk_restore_sigmask(child); |
29000caec
|
1035 1036 1037 |
ret = 0; break; } |
fca26f260
|
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 |
case PTRACE_INTERRUPT: /* * Stop tracee without any side-effect on signal or job * control. At least one trap is guaranteed to happen * after this request. If @child is already trapped, the * current trap is not disturbed and another trap will * happen after the current trap is ended with PTRACE_CONT. * * The actual trap might not be PTRACE_EVENT_STOP trap but * the pending condition is cleared regardless. */ if (unlikely(!seized || !lock_task_sighand(child, &flags))) break; |
544b2c91a
|
1051 1052 1053 1054 1055 1056 |
/* * INTERRUPT doesn't disturb existing trap sans one * exception. If ptracer issued LISTEN for the current * STOP, this INTERRUPT should clear LISTEN and re-trap * tracee into STOP. */ |
fca26f260
|
1057 |
if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP))) |
910ffdb18
|
1058 |
ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING); |
544b2c91a
|
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 |
unlock_task_sighand(child, &flags); ret = 0; break; case PTRACE_LISTEN: /* * Listen for events. Tracee must be in STOP. It's not * resumed per-se but is not considered to be in TRACED by * wait(2) or ptrace(2). If an async event (e.g. group * stop state change) happens, tracee will enter STOP trap * again. Alternatively, ptracer can issue INTERRUPT to * finish listening and re-trap tracee into STOP. */ if (unlikely(!seized || !lock_task_sighand(child, &flags))) break; si = child->last_siginfo; |
f9d81f61c
|
1077 1078 1079 1080 1081 1082 1083 |
if (likely(si && (si->si_code >> 8) == PTRACE_EVENT_STOP)) { child->jobctl |= JOBCTL_LISTENING; /* * If NOTIFY is set, it means event happened between * start of this trap and now. Trigger re-trap. */ if (child->jobctl & JOBCTL_TRAP_NOTIFY) |
910ffdb18
|
1084 |
ptrace_signal_wake_up(child, true); |
f9d81f61c
|
1085 1086 |
ret = 0; } |
fca26f260
|
1087 |
unlock_task_sighand(child, &flags); |
fca26f260
|
1088 |
break; |
1bcf54829
|
1089 1090 1091 |
case PTRACE_DETACH: /* detach a process that was attached. */ ret = ptrace_detach(child, data); break; |
36df29d79
|
1092 |
|
9c1a12592
|
1093 1094 |
#ifdef CONFIG_BINFMT_ELF_FDPIC case PTRACE_GETFDPIC: { |
e0129ef91
|
1095 |
struct mm_struct *mm = get_task_mm(child); |
9c1a12592
|
1096 |
unsigned long tmp = 0; |
e0129ef91
|
1097 1098 1099 |
ret = -ESRCH; if (!mm) break; |
9c1a12592
|
1100 1101 |
switch (addr) { case PTRACE_GETFDPIC_EXEC: |
e0129ef91
|
1102 |
tmp = mm->context.exec_fdpic_loadmap; |
9c1a12592
|
1103 1104 |
break; case PTRACE_GETFDPIC_INTERP: |
e0129ef91
|
1105 |
tmp = mm->context.interp_fdpic_loadmap; |
9c1a12592
|
1106 1107 1108 1109 |
break; default: break; } |
e0129ef91
|
1110 |
mmput(mm); |
9c1a12592
|
1111 |
|
9fed81dc4
|
1112 |
ret = put_user(tmp, datalp); |
9c1a12592
|
1113 1114 1115 |
break; } #endif |
36df29d79
|
1116 1117 1118 |
#ifdef PTRACE_SINGLESTEP case PTRACE_SINGLESTEP: #endif |
5b88abbf7
|
1119 1120 1121 |
#ifdef PTRACE_SINGLEBLOCK case PTRACE_SINGLEBLOCK: #endif |
36df29d79
|
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 |
#ifdef PTRACE_SYSEMU case PTRACE_SYSEMU: case PTRACE_SYSEMU_SINGLESTEP: #endif case PTRACE_SYSCALL: case PTRACE_CONT: return ptrace_resume(child, request, data); case PTRACE_KILL: if (child->exit_state) /* already dead */ return 0; return ptrace_resume(child, request, SIGKILL); |
2225a122a
|
1134 1135 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK case PTRACE_GETREGSET: |
29000caec
|
1136 |
case PTRACE_SETREGSET: { |
2225a122a
|
1137 |
struct iovec kiov; |
9fed81dc4
|
1138 |
struct iovec __user *uiov = datavp; |
2225a122a
|
1139 |
|
96d4f267e
|
1140 |
if (!access_ok(uiov, sizeof(*uiov))) |
2225a122a
|
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 |
return -EFAULT; if (__get_user(kiov.iov_base, &uiov->iov_base) || __get_user(kiov.iov_len, &uiov->iov_len)) return -EFAULT; ret = ptrace_regset(child, request, addr, &kiov); if (!ret) ret = __put_user(kiov.iov_len, &uiov->iov_len); break; } |
201766a20
|
1152 1153 1154 1155 |
case PTRACE_GET_SYSCALL_INFO: ret = ptrace_get_syscall_info(child, addr, datavp); break; |
2225a122a
|
1156 |
#endif |
f8e529ed9
|
1157 1158 1159 1160 |
case PTRACE_SECCOMP_GET_FILTER: ret = seccomp_get_filter(child, addr, datavp); break; |
26500475a
|
1161 1162 1163 |
case PTRACE_SECCOMP_GET_METADATA: ret = seccomp_get_metadata(child, addr, datavp); break; |
1da177e4c
|
1164 1165 1166 1167 1168 1169 |
default: break; } return ret; } |
481bed454
|
1170 |
|
0ac155591
|
1171 1172 1173 |
#ifndef arch_ptrace_attach #define arch_ptrace_attach(child) do { } while (0) #endif |
4abf98696
|
1174 1175 |
SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, unsigned long, data) |
481bed454
|
1176 1177 1178 |
{ struct task_struct *child; long ret; |
6b9c7ed84
|
1179 1180 |
if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); |
6ea6dd93c
|
1181 1182 |
if (!ret) arch_ptrace_attach(current); |
481bed454
|
1183 |
goto out; |
6b9c7ed84
|
1184 |
} |
2ee082608
|
1185 1186 1187 |
child = find_get_task_by_vpid(pid); if (!child) { ret = -ESRCH; |
6b9c7ed84
|
1188 1189 |
goto out; } |
481bed454
|
1190 |
|
3544d72a0
|
1191 |
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { |
aa9147c98
|
1192 |
ret = ptrace_attach(child, request, addr, data); |
0ac155591
|
1193 1194 1195 1196 1197 1198 |
/* * Some architectures need to do book-keeping after * a ptrace attach. */ if (!ret) arch_ptrace_attach(child); |
005f18dfd
|
1199 |
goto out_put_task_struct; |
481bed454
|
1200 |
} |
fca26f260
|
1201 1202 |
ret = ptrace_check_attach(child, request == PTRACE_KILL || request == PTRACE_INTERRUPT); |
481bed454
|
1203 1204 1205 1206 |
if (ret < 0) goto out_put_task_struct; ret = arch_ptrace(child, request, addr, data); |
9899d11f6
|
1207 1208 |
if (ret || request != PTRACE_DETACH) ptrace_unfreeze_traced(child); |
481bed454
|
1209 1210 1211 1212 |
out_put_task_struct: put_task_struct(child); out: |
481bed454
|
1213 1214 |
return ret; } |
766473231
|
1215 |
|
4abf98696
|
1216 1217 |
int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, unsigned long data) |
766473231
|
1218 1219 1220 |
{ unsigned long tmp; int copied; |
84d77d3f0
|
1221 |
copied = ptrace_access_vm(tsk, addr, &tmp, sizeof(tmp), FOLL_FORCE); |
766473231
|
1222 1223 1224 1225 |
if (copied != sizeof(tmp)) return -EIO; return put_user(tmp, (unsigned long __user *)data); } |
f284ce726
|
1226 |
|
4abf98696
|
1227 1228 |
int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, unsigned long data) |
f284ce726
|
1229 1230 |
{ int copied; |
84d77d3f0
|
1231 |
copied = ptrace_access_vm(tsk, addr, &data, sizeof(data), |
f307ab6dc
|
1232 |
FOLL_FORCE | FOLL_WRITE); |
f284ce726
|
1233 1234 |
return (copied == sizeof(data)) ? 0 : -EIO; } |
032d82d90
|
1235 |
|
96b8936a9
|
1236 |
#if defined CONFIG_COMPAT |
032d82d90
|
1237 1238 1239 1240 1241 1242 |
int compat_ptrace_request(struct task_struct *child, compat_long_t request, compat_ulong_t addr, compat_ulong_t data) { compat_ulong_t __user *datap = compat_ptr(data); compat_ulong_t word; |
ae7795bc6
|
1243 |
kernel_siginfo_t siginfo; |
032d82d90
|
1244 1245 1246 1247 1248 |
int ret; switch (request) { case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: |
84d77d3f0
|
1249 |
ret = ptrace_access_vm(child, addr, &word, sizeof(word), |
f307ab6dc
|
1250 |
FOLL_FORCE); |
032d82d90
|
1251 1252 1253 1254 1255 1256 1257 1258 |
if (ret != sizeof(word)) ret = -EIO; else ret = put_user(word, datap); break; case PTRACE_POKETEXT: case PTRACE_POKEDATA: |
84d77d3f0
|
1259 |
ret = ptrace_access_vm(child, addr, &data, sizeof(data), |
f307ab6dc
|
1260 |
FOLL_FORCE | FOLL_WRITE); |
032d82d90
|
1261 1262 1263 1264 1265 1266 |
ret = (ret != sizeof(data) ? -EIO : 0); break; case PTRACE_GETEVENTMSG: ret = put_user((compat_ulong_t) child->ptrace_message, datap); break; |
e16b27816
|
1267 1268 1269 1270 1271 1272 1273 1274 1275 |
case PTRACE_GETSIGINFO: ret = ptrace_getsiginfo(child, &siginfo); if (!ret) ret = copy_siginfo_to_user32( (struct compat_siginfo __user *) datap, &siginfo); break; case PTRACE_SETSIGINFO: |
4cd2e0e70
|
1276 1277 1278 |
ret = copy_siginfo_from_user32( &siginfo, (struct compat_siginfo __user *) datap); if (!ret) |
e16b27816
|
1279 1280 |
ret = ptrace_setsiginfo(child, &siginfo); break; |
2225a122a
|
1281 1282 1283 1284 1285 1286 1287 1288 1289 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK case PTRACE_GETREGSET: case PTRACE_SETREGSET: { struct iovec kiov; struct compat_iovec __user *uiov = (struct compat_iovec __user *) datap; compat_uptr_t ptr; compat_size_t len; |
96d4f267e
|
1290 |
if (!access_ok(uiov, sizeof(*uiov))) |
2225a122a
|
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 |
return -EFAULT; if (__get_user(ptr, &uiov->iov_base) || __get_user(len, &uiov->iov_len)) return -EFAULT; kiov.iov_base = compat_ptr(ptr); kiov.iov_len = len; ret = ptrace_regset(child, request, addr, &kiov); if (!ret) ret = __put_user(kiov.iov_len, &uiov->iov_len); break; } #endif |
e16b27816
|
1306 |
|
032d82d90
|
1307 1308 1309 1310 1311 1312 |
default: ret = ptrace_request(child, request, addr, data); } return ret; } |
c269f1961
|
1313 |
|
62a6fa976
|
1314 1315 |
COMPAT_SYSCALL_DEFINE4(ptrace, compat_long_t, request, compat_long_t, pid, compat_long_t, addr, compat_long_t, data) |
c269f1961
|
1316 1317 1318 |
{ struct task_struct *child; long ret; |
c269f1961
|
1319 1320 1321 1322 |
if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); goto out; } |
2ee082608
|
1323 1324 1325 |
child = find_get_task_by_vpid(pid); if (!child) { ret = -ESRCH; |
c269f1961
|
1326 1327 |
goto out; } |
3544d72a0
|
1328 |
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { |
aa9147c98
|
1329 |
ret = ptrace_attach(child, request, addr, data); |
c269f1961
|
1330 1331 1332 1333 1334 1335 1336 1337 |
/* * Some architectures need to do book-keeping after * a ptrace attach. */ if (!ret) arch_ptrace_attach(child); goto out_put_task_struct; } |
fca26f260
|
1338 1339 |
ret = ptrace_check_attach(child, request == PTRACE_KILL || request == PTRACE_INTERRUPT); |
9899d11f6
|
1340 |
if (!ret) { |
c269f1961
|
1341 |
ret = compat_arch_ptrace(child, request, addr, data); |
9899d11f6
|
1342 1343 1344 |
if (ret || request != PTRACE_DETACH) ptrace_unfreeze_traced(child); } |
c269f1961
|
1345 1346 1347 1348 |
out_put_task_struct: put_task_struct(child); out: |
c269f1961
|
1349 1350 |
return ret; } |
96b8936a9
|
1351 |
#endif /* CONFIG_COMPAT */ |