Blame view
kernel/ptrace.c
29.9 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 |
/* * 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 [PATCH] move capa... |
9 |
#include <linux/capability.h> |
9984de1a5 kernel: Map most ... |
10 |
#include <linux/export.h> |
1da177e4c Linux-2.6.12-rc2 |
11 12 13 14 15 |
#include <linux/sched.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/highmem.h> #include <linux/pagemap.h> |
1da177e4c Linux-2.6.12-rc2 |
16 17 |
#include <linux/ptrace.h> #include <linux/security.h> |
7ed20e1ad [PATCH] convert t... |
18 |
#include <linux/signal.h> |
a27bb332c aio: don't includ... |
19 |
#include <linux/uio.h> |
a5cb013da [PATCH] auditing ... |
20 |
#include <linux/audit.h> |
b488893a3 pid namespaces: c... |
21 |
#include <linux/pid_namespace.h> |
f17d30a80 kernel/ptrace.c s... |
22 |
#include <linux/syscalls.h> |
3a7097035 ptrace: some chec... |
23 |
#include <linux/uaccess.h> |
2225a122a ptrace: Add suppo... |
24 |
#include <linux/regset.h> |
bf26c0184 ptrace: Prepare t... |
25 |
#include <linux/hw_breakpoint.h> |
f701e5b73 connector: add an... |
26 |
#include <linux/cn_proc.h> |
84c751bd4 ptrace: add abili... |
27 |
#include <linux/compat.h> |
1da177e4c Linux-2.6.12-rc2 |
28 |
|
bf53de907 x86, bts: add for... |
29 |
|
62c124ff3 ptrace: use bit_w... |
30 31 32 33 34 |
static int ptrace_trapping_sleep_fn(void *flags) { schedule(); return 0; } |
bf53de907 x86, bts: add for... |
35 |
/* |
1da177e4c Linux-2.6.12-rc2 |
36 37 38 39 40 |
* 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. */ |
36c8b5868 [PATCH] sched: cl... |
41 |
void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) |
1da177e4c Linux-2.6.12-rc2 |
42 |
{ |
f470021ad ptrace children r... |
43 44 |
BUG_ON(!list_empty(&child->ptrace_entry)); list_add(&child->ptrace_entry, &new_parent->ptraced); |
1da177e4c Linux-2.6.12-rc2 |
45 |
child->parent = new_parent; |
1da177e4c Linux-2.6.12-rc2 |
46 |
} |
3a7097035 ptrace: some chec... |
47 |
|
e3bd058f6 ptrace: Collapse ... |
48 49 50 |
/** * __ptrace_unlink - unlink ptracee and restore its execution state * @child: ptracee to be unlinked |
1da177e4c Linux-2.6.12-rc2 |
51 |
* |
0e9f0a4ab ptrace: Always pu... |
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 |
* 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 ptrace: Collapse ... |
72 73 74 |
* * CONTEXT: * write_lock_irq(tasklist_lock) |
1da177e4c Linux-2.6.12-rc2 |
75 |
*/ |
36c8b5868 [PATCH] sched: cl... |
76 |
void __ptrace_unlink(struct task_struct *child) |
1da177e4c Linux-2.6.12-rc2 |
77 |
{ |
5ecfbae09 [PATCH] fix zap_t... |
78 |
BUG_ON(!child->ptrace); |
1da177e4c Linux-2.6.12-rc2 |
79 |
child->ptrace = 0; |
f470021ad ptrace children r... |
80 81 |
child->parent = child->real_parent; list_del_init(&child->ptrace_entry); |
1da177e4c Linux-2.6.12-rc2 |
82 |
|
1da177e4c Linux-2.6.12-rc2 |
83 |
spin_lock(&child->sighand->siglock); |
0e9f0a4ab ptrace: Always pu... |
84 85 |
/* |
73ddff2be job control: intr... |
86 87 88 89 90 91 92 |
* 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 job control: rena... |
93 |
* Reinstate JOBCTL_STOP_PENDING if group stop is in effect and |
0e9f0a4ab ptrace: Always pu... |
94 95 96 97 |
* @child isn't dead. */ if (!(child->flags & PF_EXITING) && (child->signal->flags & SIGNAL_STOP_STOPPED || |
8a88951b5 ptrace: ensure JO... |
98 |
child->signal->group_stop_count)) { |
a8f072c1d job control: rena... |
99 |
child->jobctl |= JOBCTL_STOP_PENDING; |
0e9f0a4ab ptrace: Always pu... |
100 |
|
8a88951b5 ptrace: ensure JO... |
101 102 103 104 105 106 107 108 109 110 |
/* * 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 ptrace: Always pu... |
111 112 113 114 115 116 |
/* * 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 job control: rena... |
117 |
if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child)) |
910ffdb18 ptrace: introduce... |
118 |
ptrace_signal_wake_up(child, true); |
0e9f0a4ab ptrace: Always pu... |
119 |
|
1da177e4c Linux-2.6.12-rc2 |
120 |
spin_unlock(&child->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
121 |
} |
9899d11f6 ptrace: ensure ar... |
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 |
/* 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); spin_lock_irq(&task->sighand->siglock); if (__fatal_signal_pending(task)) wake_up_state(task, __TASK_TRACED); else task->state = TASK_TRACED; spin_unlock_irq(&task->sighand->siglock); } |
755e276b3 ptrace: ptrace_ch... |
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 |
/** * 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 Linux-2.6.12-rc2 |
171 |
*/ |
edea0d03e ia64: kill thread... |
172 |
static int ptrace_check_attach(struct task_struct *child, bool ignore_state) |
1da177e4c Linux-2.6.12-rc2 |
173 174 175 176 177 178 179 180 181 182 183 |
{ 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 ptrace: ensure ar... |
184 185 |
if (child->ptrace && child->parent == current) { WARN_ON(child->state == __TASK_TRACED); |
c0c0b649d ptrace_check_atta... |
186 187 188 189 |
/* * child->sighand can't be NULL, release_task() * does ptrace_unlink() before __exit_signal(). */ |
9899d11f6 ptrace: ensure ar... |
190 |
if (ignore_state || ptrace_freeze_traced(child)) |
321fb5619 ptrace: ptrace_ch... |
191 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
192 193 |
} read_unlock(&tasklist_lock); |
9899d11f6 ptrace: ensure ar... |
194 195 196 197 198 199 200 201 202 203 204 |
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 Linux-2.6.12-rc2 |
205 |
|
1da177e4c Linux-2.6.12-rc2 |
206 207 |
return ret; } |
69f594a38 ptrace: do not au... |
208 209 210 211 212 213 214 |
static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode) { if (mode & PTRACE_MODE_NOAUDIT) return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE); else return has_ns_capability(current, ns, CAP_SYS_PTRACE); } |
9f99798ff ptrace: mark __pt... |
215 216 |
/* Returns 0 on success, -errno on denial. */ static int __ptrace_may_access(struct task_struct *task, unsigned int mode) |
ab8d11beb [PATCH] remove du... |
217 |
{ |
c69e8d9c0 CRED: Use RCU to ... |
218 |
const struct cred *cred = current_cred(), *tcred; |
b6dff3ec5 CRED: Separate ta... |
219 |
|
df26c40e5 [PATCH] proc: Cle... |
220 221 222 223 224 225 226 227 228 229 |
/* 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. */ int dumpable = 0; /* Don't let security modules deny introspection */ |
73af963f9 __ptrace_may_acce... |
230 |
if (same_thread_group(task, current)) |
df26c40e5 [PATCH] proc: Cle... |
231 |
return 0; |
c69e8d9c0 CRED: Use RCU to ... |
232 233 |
rcu_read_lock(); tcred = __task_cred(task); |
5af662030 userns: Convert p... |
234 235 236 237 238 239 |
if (uid_eq(cred->uid, tcred->euid) && uid_eq(cred->uid, tcred->suid) && uid_eq(cred->uid, tcred->uid) && gid_eq(cred->gid, tcred->egid) && gid_eq(cred->gid, tcred->sgid) && gid_eq(cred->gid, tcred->gid)) |
8409cca70 userns: allow ptr... |
240 |
goto ok; |
c4a4d6037 userns: Use cred-... |
241 |
if (ptrace_has_cap(tcred->user_ns, mode)) |
8409cca70 userns: allow ptr... |
242 243 244 245 |
goto ok; rcu_read_unlock(); return -EPERM; ok: |
c69e8d9c0 CRED: Use RCU to ... |
246 |
rcu_read_unlock(); |
ab8d11beb [PATCH] remove du... |
247 |
smp_rmb(); |
df26c40e5 [PATCH] proc: Cle... |
248 |
if (task->mm) |
6c5d52382 coredump masking:... |
249 |
dumpable = get_dumpable(task->mm); |
4c44aaafa userns: Kill task... |
250 251 252 |
rcu_read_lock(); if (!dumpable && !ptrace_has_cap(__task_cred(task)->user_ns, mode)) { rcu_read_unlock(); |
ab8d11beb [PATCH] remove du... |
253 |
return -EPERM; |
4c44aaafa userns: Kill task... |
254 255 |
} rcu_read_unlock(); |
ab8d11beb [PATCH] remove du... |
256 |
|
9e48858f7 security: rename ... |
257 |
return security_ptrace_access_check(task, mode); |
ab8d11beb [PATCH] remove du... |
258 |
} |
006ebb40d Security: split p... |
259 |
bool ptrace_may_access(struct task_struct *task, unsigned int mode) |
ab8d11beb [PATCH] remove du... |
260 261 262 |
{ int err; task_lock(task); |
006ebb40d Security: split p... |
263 |
err = __ptrace_may_access(task, mode); |
ab8d11beb [PATCH] remove du... |
264 |
task_unlock(task); |
3a7097035 ptrace: some chec... |
265 |
return !err; |
ab8d11beb [PATCH] remove du... |
266 |
} |
3544d72a0 ptrace: implement... |
267 |
static int ptrace_attach(struct task_struct *task, long request, |
aa9147c98 ptrace: make PTRA... |
268 |
unsigned long addr, |
3544d72a0 ptrace: implement... |
269 |
unsigned long flags) |
1da177e4c Linux-2.6.12-rc2 |
270 |
{ |
3544d72a0 ptrace: implement... |
271 |
bool seize = (request == PTRACE_SEIZE); |
1da177e4c Linux-2.6.12-rc2 |
272 |
int retval; |
f5b40e363 Fix ptrace_attach... |
273 |
|
3544d72a0 ptrace: implement... |
274 |
retval = -EIO; |
aa9147c98 ptrace: make PTRA... |
275 276 277 |
if (seize) { if (addr != 0) goto out; |
aa9147c98 ptrace: make PTRA... |
278 279 280 281 282 283 |
if (flags & ~(unsigned long)PTRACE_O_MASK) goto out; flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT); } else { flags = PT_PTRACED; } |
3544d72a0 ptrace: implement... |
284 |
|
a5cb013da [PATCH] auditing ... |
285 |
audit_ptrace(task); |
1da177e4c Linux-2.6.12-rc2 |
286 |
retval = -EPERM; |
b79b7ba93 ptrace: ptrace_at... |
287 288 |
if (unlikely(task->flags & PF_KTHREAD)) goto out; |
bac0abd61 Isolate some expl... |
289 |
if (same_thread_group(task, current)) |
f5b40e363 Fix ptrace_attach... |
290 |
goto out; |
f2f0b00ad ptrace: cleanup c... |
291 292 |
/* * Protect exec's credential calculations against our interference; |
86b6c1f30 ptrace: simplify ... |
293 |
* SUID, SGID and LSM creds get determined differently |
5e751e992 CRED: Rename cred... |
294 |
* under ptrace. |
d84f4f992 CRED: Inaugurate ... |
295 |
*/ |
793285fca cred_guard_mutex:... |
296 |
retval = -ERESTARTNOINTR; |
9b1bf12d5 signals: move cre... |
297 |
if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) |
d84f4f992 CRED: Inaugurate ... |
298 |
goto out; |
f5b40e363 Fix ptrace_attach... |
299 |
|
4b105cbba ptrace: do not us... |
300 |
task_lock(task); |
006ebb40d Security: split p... |
301 |
retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH); |
4b105cbba ptrace: do not us... |
302 |
task_unlock(task); |
1da177e4c Linux-2.6.12-rc2 |
303 |
if (retval) |
4b105cbba ptrace: do not us... |
304 |
goto unlock_creds; |
1da177e4c Linux-2.6.12-rc2 |
305 |
|
4b105cbba ptrace: do not us... |
306 |
write_lock_irq(&tasklist_lock); |
b79b7ba93 ptrace: ptrace_at... |
307 308 |
retval = -EPERM; if (unlikely(task->exit_state)) |
4b105cbba ptrace: do not us... |
309 |
goto unlock_tasklist; |
f2f0b00ad ptrace: cleanup c... |
310 |
if (task->ptrace) |
4b105cbba ptrace: do not us... |
311 |
goto unlock_tasklist; |
b79b7ba93 ptrace: ptrace_at... |
312 |
|
3544d72a0 ptrace: implement... |
313 |
if (seize) |
aa9147c98 ptrace: make PTRA... |
314 |
flags |= PT_SEIZED; |
4c44aaafa userns: Kill task... |
315 316 |
rcu_read_lock(); if (ns_capable(__task_cred(task)->user_ns, CAP_SYS_PTRACE)) |
aa9147c98 ptrace: make PTRA... |
317 |
flags |= PT_PTRACE_CAP; |
4c44aaafa userns: Kill task... |
318 |
rcu_read_unlock(); |
aa9147c98 ptrace: make PTRA... |
319 |
task->ptrace = flags; |
1da177e4c Linux-2.6.12-rc2 |
320 |
|
1da177e4c Linux-2.6.12-rc2 |
321 |
__ptrace_link(task, current); |
3544d72a0 ptrace: implement... |
322 323 324 325 |
/* SEIZE doesn't trap tracee on attach */ if (!seize) send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); |
b79b7ba93 ptrace: ptrace_at... |
326 |
|
d79fdd6d9 ptrace: Clean tra... |
327 328 329 |
spin_lock(&task->sighand->siglock); /* |
73ddff2be job control: intr... |
330 |
* If the task is already STOPPED, set JOBCTL_TRAP_STOP and |
d79fdd6d9 ptrace: Clean tra... |
331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 |
* 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 job control: intr... |
346 |
if (task_is_stopped(task) && |
73ddff2be job control: intr... |
347 |
task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) |
910ffdb18 ptrace: introduce... |
348 |
signal_wake_up_state(task, __TASK_STOPPED); |
d79fdd6d9 ptrace: Clean tra... |
349 350 |
spin_unlock(&task->sighand->siglock); |
b79b7ba93 ptrace: ptrace_at... |
351 |
retval = 0; |
4b105cbba ptrace: do not us... |
352 353 354 |
unlock_tasklist: write_unlock_irq(&tasklist_lock); unlock_creds: |
9b1bf12d5 signals: move cre... |
355 |
mutex_unlock(&task->signal->cred_guard_mutex); |
f5b40e363 Fix ptrace_attach... |
356 |
out: |
f701e5b73 connector: add an... |
357 |
if (!retval) { |
62c124ff3 ptrace: use bit_w... |
358 359 |
wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, ptrace_trapping_sleep_fn, TASK_UNINTERRUPTIBLE); |
f701e5b73 connector: add an... |
360 361 |
proc_ptrace_connector(task, PTRACE_ATTACH); } |
1da177e4c Linux-2.6.12-rc2 |
362 363 |
return retval; } |
f2f0b00ad ptrace: cleanup c... |
364 365 366 367 368 369 |
/** * ptrace_traceme -- helper for PTRACE_TRACEME * * Performs checks and sets PT_PTRACED. * Should be used by all ptrace implementations for PTRACE_TRACEME. */ |
e3e89cc53 Mark ptrace_{trac... |
370 |
static int ptrace_traceme(void) |
f2f0b00ad ptrace: cleanup c... |
371 372 |
{ int ret = -EPERM; |
4b105cbba ptrace: do not us... |
373 374 |
write_lock_irq(&tasklist_lock); /* Are we already being traced? */ |
f2f0b00ad ptrace: cleanup c... |
375 |
if (!current->ptrace) { |
f2f0b00ad ptrace: cleanup c... |
376 |
ret = security_ptrace_traceme(current->parent); |
f2f0b00ad ptrace: cleanup c... |
377 378 379 380 381 382 383 384 385 |
/* * 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; __ptrace_link(current, current->real_parent); } |
f2f0b00ad ptrace: cleanup c... |
386 |
} |
4b105cbba ptrace: do not us... |
387 |
write_unlock_irq(&tasklist_lock); |
f2f0b00ad ptrace: cleanup c... |
388 389 |
return ret; } |
39c626ae4 forget_original_p... |
390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 |
/* * 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 ptrace: __ptrace_... |
413 414 415 416 |
* 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 forget_original_p... |
417 418 419 |
*/ static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) { |
9843a1e97 __ptrace_detach: ... |
420 |
bool dead; |
39c626ae4 forget_original_p... |
421 |
__ptrace_unlink(p); |
9843a1e97 __ptrace_detach: ... |
422 423 424 425 426 427 428 429 430 431 |
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 __ptrace_detach: ... |
432 |
dead = true; |
39c626ae4 forget_original_p... |
433 434 |
} } |
9843a1e97 __ptrace_detach: ... |
435 436 437 438 |
/* Mark it as in the process of being reaped. */ if (dead) p->exit_state = EXIT_DEAD; return dead; |
39c626ae4 forget_original_p... |
439 |
} |
e3e89cc53 Mark ptrace_{trac... |
440 |
static int ptrace_detach(struct task_struct *child, unsigned int data) |
1da177e4c Linux-2.6.12-rc2 |
441 |
{ |
39c626ae4 forget_original_p... |
442 |
bool dead = false; |
4576145c1 ptrace: fix possi... |
443 |
|
7ed20e1ad [PATCH] convert t... |
444 |
if (!valid_signal(data)) |
5ecfbae09 [PATCH] fix zap_t... |
445 |
return -EIO; |
1da177e4c Linux-2.6.12-rc2 |
446 447 448 |
/* Architecture-specific hardware disable .. */ ptrace_disable(child); |
7d9414329 Fix spurious sysc... |
449 |
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
1da177e4c Linux-2.6.12-rc2 |
450 |
|
95c3eb76d ptrace: kill __pt... |
451 |
write_lock_irq(&tasklist_lock); |
39c626ae4 forget_original_p... |
452 453 454 455 |
/* * This child can be already killed. Make sure de_thread() or * our sub-thread doing do_wait() didn't do release_task() yet. */ |
95c3eb76d ptrace: kill __pt... |
456 457 |
if (child->ptrace) { child->exit_code = data; |
4576145c1 ptrace: fix possi... |
458 |
dead = __ptrace_detach(current, child); |
95c3eb76d ptrace: kill __pt... |
459 |
} |
1da177e4c Linux-2.6.12-rc2 |
460 |
write_unlock_irq(&tasklist_lock); |
f701e5b73 connector: add an... |
461 |
proc_ptrace_connector(child, PTRACE_DETACH); |
4576145c1 ptrace: fix possi... |
462 463 |
if (unlikely(dead)) release_task(child); |
1da177e4c Linux-2.6.12-rc2 |
464 465 |
return 0; } |
39c626ae4 forget_original_p... |
466 |
/* |
c7e49c148 ptrace: optimize ... |
467 468 469 |
* Detach all tasks we were using ptrace on. Called with tasklist held * for writing, and returns with it held too. But note it can release * and reacquire the lock. |
39c626ae4 forget_original_p... |
470 471 |
*/ void exit_ptrace(struct task_struct *tracer) |
c4b5ed250 ptrace: annotate ... |
472 473 |
__releases(&tasklist_lock) __acquires(&tasklist_lock) |
39c626ae4 forget_original_p... |
474 475 476 |
{ struct task_struct *p, *n; LIST_HEAD(ptrace_dead); |
c7e49c148 ptrace: optimize ... |
477 478 |
if (likely(list_empty(&tracer->ptraced))) return; |
39c626ae4 forget_original_p... |
479 |
list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { |
992fb6e17 ptrace: introduce... |
480 481 |
if (unlikely(p->ptrace & PT_EXITKILL)) send_sig_info(SIGKILL, SEND_SIG_FORCED, p); |
39c626ae4 forget_original_p... |
482 483 484 |
if (__ptrace_detach(tracer, p)) list_add(&p->ptrace_entry, &ptrace_dead); } |
39c626ae4 forget_original_p... |
485 |
|
c7e49c148 ptrace: optimize ... |
486 |
write_unlock_irq(&tasklist_lock); |
39c626ae4 forget_original_p... |
487 488 489 490 491 492 |
BUG_ON(!list_empty(&tracer->ptraced)); list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) { list_del_init(&p->ptrace_entry); release_task(p); } |
c7e49c148 ptrace: optimize ... |
493 494 |
write_lock_irq(&tasklist_lock); |
39c626ae4 forget_original_p... |
495 |
} |
1da177e4c Linux-2.6.12-rc2 |
496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 |
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; retval = access_process_vm(tsk, src, buf, this_len, 0); if (!retval) { if (copied) break; return -EIO; } if (copy_to_user(dst, buf, retval)) return -EFAULT; copied += retval; src += retval; dst += retval; |
3a7097035 ptrace: some chec... |
516 |
len -= retval; |
1da177e4c Linux-2.6.12-rc2 |
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
} 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; retval = access_process_vm(tsk, dst, buf, this_len, 1); if (!retval) { if (copied) break; return -EIO; } copied += retval; src += retval; dst += retval; |
3a7097035 ptrace: some chec... |
541 |
len -= retval; |
1da177e4c Linux-2.6.12-rc2 |
542 543 544 |
} return copied; } |
4abf98696 ptrace: change si... |
545 |
static int ptrace_setoptions(struct task_struct *child, unsigned long data) |
1da177e4c Linux-2.6.12-rc2 |
546 |
{ |
86b6c1f30 ptrace: simplify ... |
547 |
unsigned flags; |
8c5cf9e5c ptrace: don't mod... |
548 549 |
if (data & ~(unsigned long)PTRACE_O_MASK) return -EINVAL; |
86b6c1f30 ptrace: simplify ... |
550 551 552 553 554 |
/* 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 Linux-2.6.12-rc2 |
555 |
|
8c5cf9e5c ptrace: don't mod... |
556 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
557 |
} |
e16b27816 ptrace: compat_pt... |
558 |
static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) |
1da177e4c Linux-2.6.12-rc2 |
559 |
{ |
e49612544 ptrace: don't tak... |
560 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
561 |
int error = -ESRCH; |
e49612544 ptrace: don't tak... |
562 |
if (lock_task_sighand(child, &flags)) { |
1da177e4c Linux-2.6.12-rc2 |
563 |
error = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
564 |
if (likely(child->last_siginfo != NULL)) { |
e16b27816 ptrace: compat_pt... |
565 |
*info = *child->last_siginfo; |
1da177e4c Linux-2.6.12-rc2 |
566 567 |
error = 0; } |
e49612544 ptrace: don't tak... |
568 |
unlock_task_sighand(child, &flags); |
1da177e4c Linux-2.6.12-rc2 |
569 |
} |
1da177e4c Linux-2.6.12-rc2 |
570 571 |
return error; } |
e16b27816 ptrace: compat_pt... |
572 |
static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) |
1da177e4c Linux-2.6.12-rc2 |
573 |
{ |
e49612544 ptrace: don't tak... |
574 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
575 |
int error = -ESRCH; |
e49612544 ptrace: don't tak... |
576 |
if (lock_task_sighand(child, &flags)) { |
1da177e4c Linux-2.6.12-rc2 |
577 |
error = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
578 |
if (likely(child->last_siginfo != NULL)) { |
e16b27816 ptrace: compat_pt... |
579 |
*child->last_siginfo = *info; |
1da177e4c Linux-2.6.12-rc2 |
580 581 |
error = 0; } |
e49612544 ptrace: don't tak... |
582 |
unlock_task_sighand(child, &flags); |
1da177e4c Linux-2.6.12-rc2 |
583 |
} |
1da177e4c Linux-2.6.12-rc2 |
584 585 |
return error; } |
84c751bd4 ptrace: add abili... |
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 |
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; if (arg.flags & PTRACE_PEEKSIGINFO_SHARED) pending = &child->signal->shared_pending; else pending = &child->pending; for (i = 0; i < arg.nr; ) { siginfo_t info; s32 off = arg.off + i; spin_lock_irq(&child->sighand->siglock); list_for_each_entry(q, &pending->list, list) { if (!off--) { copy_siginfo(&info, &q->info); break; } } spin_unlock_irq(&child->sighand->siglock); if (off >= 0) /* beyond the end of the list */ break; #ifdef CONFIG_COMPAT if (unlikely(is_compat_task())) { compat_siginfo_t __user *uinfo = compat_ptr(data); |
706b23bde Fix: kernel/ptrac... |
630 631 632 633 634 |
if (copy_siginfo_to_user32(uinfo, &info) || __put_user(info.si_code, &uinfo->si_code)) { ret = -EFAULT; break; } |
84c751bd4 ptrace: add abili... |
635 636 637 638 |
} else #endif { siginfo_t __user *uinfo = (siginfo_t __user *) data; |
706b23bde Fix: kernel/ptrac... |
639 640 641 642 643 |
if (copy_siginfo_to_user(uinfo, &info) || __put_user(info.si_code, &uinfo->si_code)) { ret = -EFAULT; break; } |
84c751bd4 ptrace: add abili... |
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 |
} data += sizeof(siginfo_t); i++; if (signal_pending(current)) break; cond_resched(); } if (i > 0) return i; return ret; } |
36df29d79 ptrace: generic r... |
660 661 662 663 664 665 |
#ifdef PTRACE_SINGLESTEP #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) #else #define is_singlestep(request) 0 #endif |
5b88abbf7 ptrace: generic P... |
666 667 668 669 670 |
#ifdef PTRACE_SINGLEBLOCK #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) #else #define is_singleblock(request) 0 #endif |
36df29d79 ptrace: generic r... |
671 672 673 674 675 |
#ifdef PTRACE_SYSEMU #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) #else #define is_sysemu_singlestep(request) 0 #endif |
4abf98696 ptrace: change si... |
676 677 |
static int ptrace_resume(struct task_struct *child, long request, unsigned long data) |
36df29d79 ptrace: generic r... |
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
{ 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 ptrace: generic P... |
693 694 695 696 697 |
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 ptrace: generic r... |
698 699 700 |
if (unlikely(!arch_has_single_step())) return -EIO; user_enable_single_step(child); |
3a7097035 ptrace: some chec... |
701 |
} else { |
36df29d79 ptrace: generic r... |
702 |
user_disable_single_step(child); |
3a7097035 ptrace: some chec... |
703 |
} |
36df29d79 ptrace: generic r... |
704 705 |
child->exit_code = data; |
0666fb51b ptrace: ptrace_re... |
706 |
wake_up_state(child, __TASK_TRACED); |
36df29d79 ptrace: generic r... |
707 708 709 |
return 0; } |
2225a122a ptrace: Add suppo... |
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 |
#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 ptrace: Fix ptrac... |
735 |
return -EINVAL; |
2225a122a ptrace: Add suppo... |
736 737 738 739 740 741 742 743 744 745 746 747 |
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 uprobes: Add expo... |
748 749 750 751 752 753 |
/* * 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); |
2225a122a ptrace: Add suppo... |
754 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
755 |
int ptrace_request(struct task_struct *child, long request, |
4abf98696 ptrace: change si... |
756 |
unsigned long addr, unsigned long data) |
1da177e4c Linux-2.6.12-rc2 |
757 |
{ |
fca26f260 ptrace: implement... |
758 |
bool seized = child->ptrace & PT_SEIZED; |
1da177e4c Linux-2.6.12-rc2 |
759 |
int ret = -EIO; |
544b2c91a ptrace: implement... |
760 |
siginfo_t siginfo, *si; |
9fed81dc4 ptrace: cleanup p... |
761 762 |
void __user *datavp = (void __user *) data; unsigned long __user *datalp = datavp; |
fca26f260 ptrace: implement... |
763 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
764 765 |
switch (request) { |
16c3e389e x86: ptrace_reque... |
766 767 768 769 770 771 |
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 Linux-2.6.12-rc2 |
772 773 774 775 776 777 778 |
#ifdef PTRACE_OLDSETOPTIONS case PTRACE_OLDSETOPTIONS: #endif case PTRACE_SETOPTIONS: ret = ptrace_setoptions(child, data); break; case PTRACE_GETEVENTMSG: |
9fed81dc4 ptrace: cleanup p... |
779 |
ret = put_user(child->ptrace_message, datalp); |
1da177e4c Linux-2.6.12-rc2 |
780 |
break; |
e16b27816 ptrace: compat_pt... |
781 |
|
84c751bd4 ptrace: add abili... |
782 783 784 |
case PTRACE_PEEKSIGINFO: ret = ptrace_peek_siginfo(child, addr, data); break; |
1da177e4c Linux-2.6.12-rc2 |
785 |
case PTRACE_GETSIGINFO: |
e16b27816 ptrace: compat_pt... |
786 787 |
ret = ptrace_getsiginfo(child, &siginfo); if (!ret) |
9fed81dc4 ptrace: cleanup p... |
788 |
ret = copy_siginfo_to_user(datavp, &siginfo); |
1da177e4c Linux-2.6.12-rc2 |
789 |
break; |
e16b27816 ptrace: compat_pt... |
790 |
|
1da177e4c Linux-2.6.12-rc2 |
791 |
case PTRACE_SETSIGINFO: |
9fed81dc4 ptrace: cleanup p... |
792 |
if (copy_from_user(&siginfo, datavp, sizeof siginfo)) |
e16b27816 ptrace: compat_pt... |
793 794 795 |
ret = -EFAULT; else ret = ptrace_setsiginfo(child, &siginfo); |
1da177e4c Linux-2.6.12-rc2 |
796 |
break; |
e16b27816 ptrace: compat_pt... |
797 |
|
29000caec ptrace: add abili... |
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 |
case PTRACE_GETSIGMASK: if (addr != sizeof(sigset_t)) { ret = -EINVAL; break; } if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t))) ret = -EFAULT; else ret = 0; break; 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); ret = 0; break; } |
fca26f260 ptrace: implement... |
838 839 840 841 842 843 844 845 846 847 848 849 850 |
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 ptrace: implement... |
851 852 853 854 855 856 |
/* * 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 ptrace: implement... |
857 |
if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP))) |
910ffdb18 ptrace: introduce... |
858 |
ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING); |
544b2c91a ptrace: implement... |
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 |
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 ptrace: PTRACE_LI... |
877 878 879 880 881 882 883 |
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 ptrace: introduce... |
884 |
ptrace_signal_wake_up(child, true); |
f9d81f61c ptrace: PTRACE_LI... |
885 886 |
ret = 0; } |
fca26f260 ptrace: implement... |
887 |
unlock_task_sighand(child, &flags); |
fca26f260 ptrace: implement... |
888 |
break; |
1bcf54829 Consolidate PTRAC... |
889 890 891 |
case PTRACE_DETACH: /* detach a process that was attached. */ ret = ptrace_detach(child, data); break; |
36df29d79 ptrace: generic r... |
892 |
|
9c1a12592 ptrace: unify FDP... |
893 894 |
#ifdef CONFIG_BINFMT_ELF_FDPIC case PTRACE_GETFDPIC: { |
e0129ef91 ptrace: PTRACE_GE... |
895 |
struct mm_struct *mm = get_task_mm(child); |
9c1a12592 ptrace: unify FDP... |
896 |
unsigned long tmp = 0; |
e0129ef91 ptrace: PTRACE_GE... |
897 898 899 |
ret = -ESRCH; if (!mm) break; |
9c1a12592 ptrace: unify FDP... |
900 901 |
switch (addr) { case PTRACE_GETFDPIC_EXEC: |
e0129ef91 ptrace: PTRACE_GE... |
902 |
tmp = mm->context.exec_fdpic_loadmap; |
9c1a12592 ptrace: unify FDP... |
903 904 |
break; case PTRACE_GETFDPIC_INTERP: |
e0129ef91 ptrace: PTRACE_GE... |
905 |
tmp = mm->context.interp_fdpic_loadmap; |
9c1a12592 ptrace: unify FDP... |
906 907 908 909 |
break; default: break; } |
e0129ef91 ptrace: PTRACE_GE... |
910 |
mmput(mm); |
9c1a12592 ptrace: unify FDP... |
911 |
|
9fed81dc4 ptrace: cleanup p... |
912 |
ret = put_user(tmp, datalp); |
9c1a12592 ptrace: unify FDP... |
913 914 915 |
break; } #endif |
36df29d79 ptrace: generic r... |
916 917 918 |
#ifdef PTRACE_SINGLESTEP case PTRACE_SINGLESTEP: #endif |
5b88abbf7 ptrace: generic P... |
919 920 921 |
#ifdef PTRACE_SINGLEBLOCK case PTRACE_SINGLEBLOCK: #endif |
36df29d79 ptrace: generic r... |
922 923 924 925 926 927 928 929 930 931 932 933 |
#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 ptrace: Add suppo... |
934 935 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK case PTRACE_GETREGSET: |
29000caec ptrace: add abili... |
936 |
case PTRACE_SETREGSET: { |
2225a122a ptrace: Add suppo... |
937 |
struct iovec kiov; |
9fed81dc4 ptrace: cleanup p... |
938 |
struct iovec __user *uiov = datavp; |
2225a122a ptrace: Add suppo... |
939 940 941 942 943 944 945 946 947 948 949 950 951 952 |
if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 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; } #endif |
1da177e4c Linux-2.6.12-rc2 |
953 954 955 956 957 958 |
default: break; } return ret; } |
481bed454 [PATCH] consolida... |
959 |
|
8053bdd5c ptrace_get_task_s... |
960 |
static struct task_struct *ptrace_get_task_struct(pid_t pid) |
6b9c7ed84 [PATCH] use ptrac... |
961 962 |
{ struct task_struct *child; |
481bed454 [PATCH] consolida... |
963 |
|
8053bdd5c ptrace_get_task_s... |
964 |
rcu_read_lock(); |
228ebcbe6 Uninline find_tas... |
965 |
child = find_task_by_vpid(pid); |
481bed454 [PATCH] consolida... |
966 967 |
if (child) get_task_struct(child); |
8053bdd5c ptrace_get_task_s... |
968 |
rcu_read_unlock(); |
f400e198b [PATCH] pidspace:... |
969 |
|
481bed454 [PATCH] consolida... |
970 |
if (!child) |
6b9c7ed84 [PATCH] use ptrac... |
971 972 |
return ERR_PTR(-ESRCH); return child; |
481bed454 [PATCH] consolida... |
973 |
} |
0ac155591 m32r: convert to ... |
974 975 976 |
#ifndef arch_ptrace_attach #define arch_ptrace_attach(child) do { } while (0) #endif |
4abf98696 ptrace: change si... |
977 978 |
SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, unsigned long, data) |
481bed454 [PATCH] consolida... |
979 980 981 |
{ struct task_struct *child; long ret; |
6b9c7ed84 [PATCH] use ptrac... |
982 983 |
if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); |
6ea6dd93c ptrace: Call arch... |
984 985 |
if (!ret) arch_ptrace_attach(current); |
481bed454 [PATCH] consolida... |
986 |
goto out; |
6b9c7ed84 [PATCH] use ptrac... |
987 988 989 990 991 992 993 |
} child = ptrace_get_task_struct(pid); if (IS_ERR(child)) { ret = PTR_ERR(child); goto out; } |
481bed454 [PATCH] consolida... |
994 |
|
3544d72a0 ptrace: implement... |
995 |
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { |
aa9147c98 ptrace: make PTRA... |
996 |
ret = ptrace_attach(child, request, addr, data); |
0ac155591 m32r: convert to ... |
997 998 999 1000 1001 1002 |
/* * Some architectures need to do book-keeping after * a ptrace attach. */ if (!ret) arch_ptrace_attach(child); |
005f18dfd [PATCH] fix task_... |
1003 |
goto out_put_task_struct; |
481bed454 [PATCH] consolida... |
1004 |
} |
fca26f260 ptrace: implement... |
1005 1006 |
ret = ptrace_check_attach(child, request == PTRACE_KILL || request == PTRACE_INTERRUPT); |
481bed454 [PATCH] consolida... |
1007 1008 1009 1010 |
if (ret < 0) goto out_put_task_struct; ret = arch_ptrace(child, request, addr, data); |
9899d11f6 ptrace: ensure ar... |
1011 1012 |
if (ret || request != PTRACE_DETACH) ptrace_unfreeze_traced(child); |
481bed454 [PATCH] consolida... |
1013 1014 1015 1016 |
out_put_task_struct: put_task_struct(child); out: |
481bed454 [PATCH] consolida... |
1017 1018 |
return ret; } |
766473231 PTRACE_PEEKDATA c... |
1019 |
|
4abf98696 ptrace: change si... |
1020 1021 |
int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, unsigned long data) |
766473231 PTRACE_PEEKDATA c... |
1022 1023 1024 1025 1026 1027 1028 1029 1030 |
{ unsigned long tmp; int copied; copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0); if (copied != sizeof(tmp)) return -EIO; return put_user(tmp, (unsigned long __user *)data); } |
f284ce726 PTRACE_POKEDATA c... |
1031 |
|
4abf98696 ptrace: change si... |
1032 1033 |
int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, unsigned long data) |
f284ce726 PTRACE_POKEDATA c... |
1034 1035 1036 1037 1038 1039 |
{ int copied; copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); return (copied == sizeof(data)) ? 0 : -EIO; } |
032d82d90 x86: compat_ptrac... |
1040 |
|
96b8936a9 remove __ARCH_WAN... |
1041 |
#if defined CONFIG_COMPAT |
032d82d90 x86: compat_ptrac... |
1042 1043 1044 1045 1046 1047 1048 |
#include <linux/compat.h> 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; |
e16b27816 ptrace: compat_pt... |
1049 |
siginfo_t siginfo; |
032d82d90 x86: compat_ptrac... |
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 |
int ret; switch (request) { case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: ret = access_process_vm(child, addr, &word, sizeof(word), 0); if (ret != sizeof(word)) ret = -EIO; else ret = put_user(word, datap); break; case PTRACE_POKETEXT: case PTRACE_POKEDATA: ret = access_process_vm(child, addr, &data, sizeof(data), 1); ret = (ret != sizeof(data) ? -EIO : 0); break; case PTRACE_GETEVENTMSG: ret = put_user((compat_ulong_t) child->ptrace_message, datap); break; |
e16b27816 ptrace: compat_pt... |
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
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: memset(&siginfo, 0, sizeof siginfo); if (copy_siginfo_from_user32( &siginfo, (struct compat_siginfo __user *) datap)) ret = -EFAULT; else ret = ptrace_setsiginfo(child, &siginfo); break; |
2225a122a ptrace: Add suppo... |
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 |
#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; if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 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 ptrace: compat_pt... |
1113 |
|
032d82d90 x86: compat_ptrac... |
1114 1115 1116 1117 1118 1119 |
default: ret = ptrace_request(child, request, addr, data); } return ret; } |
c269f1961 x86: compat_sys_p... |
1120 |
|
c269f1961 x86: compat_sys_p... |
1121 1122 1123 1124 1125 |
asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid, compat_long_t addr, compat_long_t data) { struct task_struct *child; long ret; |
c269f1961 x86: compat_sys_p... |
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 |
if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); goto out; } child = ptrace_get_task_struct(pid); if (IS_ERR(child)) { ret = PTR_ERR(child); goto out; } |
3544d72a0 ptrace: implement... |
1136 |
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { |
aa9147c98 ptrace: make PTRA... |
1137 |
ret = ptrace_attach(child, request, addr, data); |
c269f1961 x86: compat_sys_p... |
1138 1139 1140 1141 1142 1143 1144 1145 |
/* * Some architectures need to do book-keeping after * a ptrace attach. */ if (!ret) arch_ptrace_attach(child); goto out_put_task_struct; } |
fca26f260 ptrace: implement... |
1146 1147 |
ret = ptrace_check_attach(child, request == PTRACE_KILL || request == PTRACE_INTERRUPT); |
9899d11f6 ptrace: ensure ar... |
1148 |
if (!ret) { |
c269f1961 x86: compat_sys_p... |
1149 |
ret = compat_arch_ptrace(child, request, addr, data); |
9899d11f6 ptrace: ensure ar... |
1150 1151 1152 |
if (ret || request != PTRACE_DETACH) ptrace_unfreeze_traced(child); } |
c269f1961 x86: compat_sys_p... |
1153 1154 1155 1156 |
out_put_task_struct: put_task_struct(child); out: |
c269f1961 x86: compat_sys_p... |
1157 1158 |
return ret; } |
96b8936a9 remove __ARCH_WAN... |
1159 |
#endif /* CONFIG_COMPAT */ |