Blame view
kernel/exit.c
44.3 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 |
/* * linux/kernel/exit.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
1da177e4c Linux-2.6.12-rc2 |
6 7 |
#include <linux/mm.h> #include <linux/slab.h> |
4eb5aaa3a sched/headers: Pr... |
8 |
#include <linux/sched/autogroup.h> |
6e84f3152 sched/headers: Pr... |
9 |
#include <linux/sched/mm.h> |
03441a348 sched/headers: Pr... |
10 |
#include <linux/sched/stat.h> |
299300258 sched/headers: Pr... |
11 |
#include <linux/sched/task.h> |
68db0cf10 sched/headers: Pr... |
12 |
#include <linux/sched/task_stack.h> |
32ef5517c sched/headers: Pr... |
13 |
#include <linux/sched/cputime.h> |
1da177e4c Linux-2.6.12-rc2 |
14 |
#include <linux/interrupt.h> |
1da177e4c Linux-2.6.12-rc2 |
15 |
#include <linux/module.h> |
c59ede7b7 [PATCH] move capa... |
16 |
#include <linux/capability.h> |
1da177e4c Linux-2.6.12-rc2 |
17 18 19 |
#include <linux/completion.h> #include <linux/personality.h> #include <linux/tty.h> |
da9cbc873 block: blkdev.h c... |
20 |
#include <linux/iocontext.h> |
1da177e4c Linux-2.6.12-rc2 |
21 |
#include <linux/key.h> |
1da177e4c Linux-2.6.12-rc2 |
22 23 |
#include <linux/cpu.h> #include <linux/acct.h> |
8f0ab5147 [PATCH] csa: conv... |
24 |
#include <linux/tsacct_kern.h> |
1da177e4c Linux-2.6.12-rc2 |
25 |
#include <linux/file.h> |
9f3acc314 [PATCH] split lin... |
26 |
#include <linux/fdtable.h> |
80d26af89 coredump: use a f... |
27 |
#include <linux/freezer.h> |
1da177e4c Linux-2.6.12-rc2 |
28 |
#include <linux/binfmts.h> |
ab516013a [PATCH] namespace... |
29 |
#include <linux/nsproxy.h> |
84d737866 [PATCH] add child... |
30 |
#include <linux/pid_namespace.h> |
1da177e4c Linux-2.6.12-rc2 |
31 32 33 34 |
#include <linux/ptrace.h> #include <linux/profile.h> #include <linux/mount.h> #include <linux/proc_fs.h> |
49d769d52 Change reparent_t... |
35 |
#include <linux/kthread.h> |
1da177e4c Linux-2.6.12-rc2 |
36 |
#include <linux/mempolicy.h> |
c757249af [PATCH] per-task-... |
37 |
#include <linux/taskstats_kern.h> |
ca74e92b4 [PATCH] per-task-... |
38 |
#include <linux/delayacct.h> |
b4f48b636 Task Control Grou... |
39 |
#include <linux/cgroup.h> |
1da177e4c Linux-2.6.12-rc2 |
40 |
#include <linux/syscalls.h> |
7ed20e1ad [PATCH] convert t... |
41 |
#include <linux/signal.h> |
6a14c5c9d [PATCH] move __ex... |
42 |
#include <linux/posix-timers.h> |
9f46080c4 [PATCH] Process E... |
43 |
#include <linux/cn_proc.h> |
de5097c2e [PATCH] mutex sub... |
44 |
#include <linux/mutex.h> |
0771dfefc [PATCH] lightweig... |
45 |
#include <linux/futex.h> |
b92ce5589 [PATCH] splice: a... |
46 |
#include <linux/pipe_fs_i.h> |
fa84cb935 [PATCH] move call... |
47 |
#include <linux/audit.h> /* for audit_free() */ |
83cc5ed3c [PATCH] kernel/sy... |
48 |
#include <linux/resource.h> |
0d67a46df [PATCH] BLOCK: Re... |
49 |
#include <linux/blkdev.h> |
6eaeeaba3 getrusage(): fill... |
50 |
#include <linux/task_io_accounting_ops.h> |
30199f5a4 tracehook: exit |
51 |
#include <linux/tracehook.h> |
5ad4e53bd Get rid of indire... |
52 |
#include <linux/fs_struct.h> |
d84f4f992 CRED: Inaugurate ... |
53 |
#include <linux/init_task.h> |
cdd6c482c perf: Do the big ... |
54 |
#include <linux/perf_event.h> |
ad8d75fff tracing/events: m... |
55 |
#include <trace/events/sched.h> |
24f1e32c6 hw-breakpoints: R... |
56 |
#include <linux/hw_breakpoint.h> |
3d5992d2a oom: add per-mm o... |
57 |
#include <linux/oom.h> |
54848d73f writeback: charge... |
58 |
#include <linux/writeback.h> |
404015308 security: trim se... |
59 |
#include <linux/shm.h> |
5c9a8750a kernel: add kcov ... |
60 |
#include <linux/kcov.h> |
53d3eaa31 posix_cpu_timers:... |
61 |
#include <linux/random.h> |
8f95c90ce sched/wait, RCU: ... |
62 |
#include <linux/rcuwait.h> |
7e95a2259 move compat wait4... |
63 |
#include <linux/compat.h> |
1da177e4c Linux-2.6.12-rc2 |
64 |
|
7c0f6ba68 Replace <asm/uacc... |
65 |
#include <linux/uaccess.h> |
1da177e4c Linux-2.6.12-rc2 |
66 67 68 |
#include <asm/unistd.h> #include <asm/pgtable.h> #include <asm/mmu_context.h> |
d40e48e02 exit: __exit_sign... |
69 |
static void __unhash_process(struct task_struct *p, bool group_dead) |
1da177e4c Linux-2.6.12-rc2 |
70 71 |
{ nr_threads--; |
50d75f8da pidns: find_new_r... |
72 |
detach_pid(p, PIDTYPE_PID); |
d40e48e02 exit: __exit_sign... |
73 |
if (group_dead) { |
1da177e4c Linux-2.6.12-rc2 |
74 75 |
detach_pid(p, PIDTYPE_PGID); detach_pid(p, PIDTYPE_SID); |
c97d98931 [PATCH] kill SET_... |
76 |
|
5e85d4abe [PATCH] task: Mak... |
77 |
list_del_rcu(&p->tasks); |
9cd80bbb0 do_wait() optimiz... |
78 |
list_del_init(&p->sibling); |
909ea9646 core: Replace __g... |
79 |
__this_cpu_dec(process_counts); |
1da177e4c Linux-2.6.12-rc2 |
80 |
} |
47e65328a [PATCH] pids: kil... |
81 |
list_del_rcu(&p->thread_group); |
0c740d0af introduce for_eac... |
82 |
list_del_rcu(&p->thread_node); |
1da177e4c Linux-2.6.12-rc2 |
83 |
} |
6a14c5c9d [PATCH] move __ex... |
84 85 86 87 88 89 |
/* * This function expects the tasklist_lock write-locked. */ static void __exit_signal(struct task_struct *tsk) { struct signal_struct *sig = tsk->signal; |
d40e48e02 exit: __exit_sign... |
90 |
bool group_dead = thread_group_leader(tsk); |
6a14c5c9d [PATCH] move __ex... |
91 |
struct sighand_struct *sighand; |
4ada856fb signals: clear si... |
92 |
struct tty_struct *uninitialized_var(tty); |
5613fda9a sched/cputime: Co... |
93 |
u64 utime, stime; |
6a14c5c9d [PATCH] move __ex... |
94 |
|
d11c563dd sched: Use lockde... |
95 |
sighand = rcu_dereference_check(tsk->sighand, |
db1466b3e rcu: Use wrapper ... |
96 |
lockdep_tasklist_lock_is_held()); |
6a14c5c9d [PATCH] move __ex... |
97 |
spin_lock(&sighand->siglock); |
baa73d9e4 posix-timers: Mak... |
98 |
#ifdef CONFIG_POSIX_TIMERS |
6a14c5c9d [PATCH] move __ex... |
99 |
posix_cpu_timers_exit(tsk); |
d40e48e02 exit: __exit_sign... |
100 |
if (group_dead) { |
6a14c5c9d [PATCH] move __ex... |
101 |
posix_cpu_timers_exit_group(tsk); |
4a5999429 exit: avoid sig->... |
102 |
} else { |
6a14c5c9d [PATCH] move __ex... |
103 |
/* |
e0a702171 posix-cpu-timers:... |
104 105 106 107 108 109 |
* This can only happen if the caller is de_thread(). * FIXME: this is the temporary hack, we should teach * posix-cpu-timers to handle this case correctly. */ if (unlikely(has_group_leader_pid(tsk))) posix_cpu_timers_exit_group(tsk); |
baa73d9e4 posix-timers: Mak... |
110 111 |
} #endif |
e0a702171 posix-cpu-timers:... |
112 |
|
baa73d9e4 posix-timers: Mak... |
113 114 115 116 |
if (group_dead) { tty = sig->tty; sig->tty = NULL; } else { |
e0a702171 posix-cpu-timers:... |
117 |
/* |
6a14c5c9d [PATCH] move __ex... |
118 119 120 |
* If there is any task waiting for the group exit * then notify it: */ |
d344193a0 exit: avoid sig->... |
121 |
if (sig->notify_count > 0 && !--sig->notify_count) |
6a14c5c9d [PATCH] move __ex... |
122 |
wake_up_process(sig->group_exit_task); |
6db840fa7 exec: RT sub-thre... |
123 |
|
6a14c5c9d [PATCH] move __ex... |
124 125 |
if (tsk == sig->curr_target) sig->curr_target = next_thread(tsk); |
6a14c5c9d [PATCH] move __ex... |
126 |
} |
53d3eaa31 posix_cpu_timers:... |
127 128 |
add_device_randomness((const void*) &tsk->se.sum_exec_runtime, sizeof(unsigned long long)); |
90ed9cbe7 exit: Always reap... |
129 |
/* |
26e75b5c3 exit: release_tas... |
130 131 132 133 |
* Accumulate here the counters for all threads as they die. We could * skip the group leader because it is the last user of signal_struct, * but we want to avoid the race with thread_group_cputime() which can * see the empty ->thread_head list. |
90ed9cbe7 exit: Always reap... |
134 135 |
*/ task_cputime(tsk, &utime, &stime); |
e78c34967 time, signal: Pro... |
136 |
write_seqlock(&sig->stats_lock); |
90ed9cbe7 exit: Always reap... |
137 138 139 140 141 142 143 144 145 146 147 |
sig->utime += utime; sig->stime += stime; sig->gtime += task_gtime(tsk); sig->min_flt += tsk->min_flt; sig->maj_flt += tsk->maj_flt; sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; sig->inblock += task_io_get_inblock(tsk); sig->oublock += task_io_get_oublock(tsk); task_io_accounting_add(&sig->ioac, &tsk->ioac); sig->sum_sched_runtime += tsk->se.sum_exec_runtime; |
b3ac022cb proc: turn signal... |
148 |
sig->nr_threads--; |
d40e48e02 exit: __exit_sign... |
149 |
__unhash_process(tsk, group_dead); |
e78c34967 time, signal: Pro... |
150 |
write_sequnlock(&sig->stats_lock); |
5876700cd [PATCH] do __unha... |
151 |
|
da7978b03 signals: fix sigq... |
152 153 154 155 156 |
/* * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ flush_sigqueue(&tsk->pending); |
a7e5328a0 [PATCH] cleanup _... |
157 |
tsk->sighand = NULL; |
6a14c5c9d [PATCH] move __ex... |
158 |
spin_unlock(&sighand->siglock); |
6a14c5c9d [PATCH] move __ex... |
159 |
|
a7e5328a0 [PATCH] cleanup _... |
160 |
__cleanup_sighand(sighand); |
a0be55dee kernel/exit.c: fi... |
161 |
clear_tsk_thread_flag(tsk, TIF_SIGPENDING); |
d40e48e02 exit: __exit_sign... |
162 |
if (group_dead) { |
6a14c5c9d [PATCH] move __ex... |
163 |
flush_sigqueue(&sig->shared_pending); |
4ada856fb signals: clear si... |
164 |
tty_kref_put(tty); |
6a14c5c9d [PATCH] move __ex... |
165 166 |
} } |
8c7904a00 [PATCH] task: RCU... |
167 168 |
static void delayed_put_task_struct(struct rcu_head *rhp) { |
0a16b6075 tracing, sched: L... |
169 |
struct task_struct *tsk = container_of(rhp, struct task_struct, rcu); |
4e231c796 perf: Fix up dela... |
170 |
perf_event_delayed_put(tsk); |
0a16b6075 tracing, sched: L... |
171 172 |
trace_sched_process_free(tsk); put_task_struct(tsk); |
8c7904a00 [PATCH] task: RCU... |
173 |
} |
f470021ad ptrace children r... |
174 |
|
a0be55dee kernel/exit.c: fi... |
175 |
void release_task(struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
176 |
{ |
36c8b5868 [PATCH] sched: cl... |
177 |
struct task_struct *leader; |
1da177e4c Linux-2.6.12-rc2 |
178 |
int zap_leader; |
1f09f9749 [PATCH] release_t... |
179 |
repeat: |
c69e8d9c0 CRED: Use RCU to ... |
180 |
/* don't need to get the RCU readlock here - the process is dead and |
d11c563dd sched: Use lockde... |
181 182 |
* can't be modifying its own credentials. But shut RCU-lockdep up */ rcu_read_lock(); |
c69e8d9c0 CRED: Use RCU to ... |
183 |
atomic_dec(&__task_cred(p)->user->processes); |
d11c563dd sched: Use lockde... |
184 |
rcu_read_unlock(); |
c69e8d9c0 CRED: Use RCU to ... |
185 |
|
60347f671 pid namespaces: p... |
186 |
proc_flush_task(p); |
0203026b5 perf_counter: fix... |
187 |
|
1da177e4c Linux-2.6.12-rc2 |
188 |
write_lock_irq(&tasklist_lock); |
a288eecce ptrace: kill triv... |
189 |
ptrace_release_task(p); |
1da177e4c Linux-2.6.12-rc2 |
190 |
__exit_signal(p); |
35f5cad8c [PATCH] revert "O... |
191 |
|
1da177e4c Linux-2.6.12-rc2 |
192 193 194 195 196 197 198 |
/* * If we are the last non-leader member of the thread * group, and the leader is zombie, then notify the * group leader's parent process. (if it wants notification.) */ zap_leader = 0; leader = p->group_leader; |
a0be55dee kernel/exit.c: fi... |
199 200 |
if (leader != p && thread_group_empty(leader) && leader->exit_state == EXIT_ZOMBIE) { |
1da177e4c Linux-2.6.12-rc2 |
201 202 203 204 |
/* * If we were the last child thread and the leader has * exited already, and the leader's parent ignores SIGCHLD, * then we are the one who should release the leader. |
dae33574d tracehook: releas... |
205 |
*/ |
867734737 make do_notify_pa... |
206 |
zap_leader = do_notify_parent(leader, leader->exit_signal); |
dae33574d tracehook: releas... |
207 208 |
if (zap_leader) leader->exit_state = EXIT_DEAD; |
1da177e4c Linux-2.6.12-rc2 |
209 |
} |
1da177e4c Linux-2.6.12-rc2 |
210 |
write_unlock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
211 |
release_thread(p); |
8c7904a00 [PATCH] task: RCU... |
212 |
call_rcu(&p->rcu, delayed_put_task_struct); |
1da177e4c Linux-2.6.12-rc2 |
213 214 215 216 217 |
p = leader; if (unlikely(zap_leader)) goto repeat; } |
1da177e4c Linux-2.6.12-rc2 |
218 |
/* |
150593bf8 sched/api: Introd... |
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 |
* Note that if this function returns a valid task_struct pointer (!NULL) * task->usage must remain >0 for the duration of the RCU critical section. */ struct task_struct *task_rcu_dereference(struct task_struct **ptask) { struct sighand_struct *sighand; struct task_struct *task; /* * We need to verify that release_task() was not called and thus * delayed_put_task_struct() can't run and drop the last reference * before rcu_read_unlock(). We check task->sighand != NULL, * but we can read the already freed and reused memory. */ retry: task = rcu_dereference(*ptask); if (!task) return NULL; probe_kernel_address(&task->sighand, sighand); /* * Pairs with atomic_dec_and_test() in put_task_struct(). If this task * was already freed we can not miss the preceding update of this * pointer. */ smp_rmb(); if (unlikely(task != READ_ONCE(*ptask))) goto retry; /* * We've re-checked that "task == *ptask", now we have two different * cases: * * 1. This is actually the same task/task_struct. In this case * sighand != NULL tells us it is still alive. * * 2. This is another task which got the same memory for task_struct. * We can't know this of course, and we can not trust * sighand != NULL. * * In this case we actually return a random value, but this is * correct. * * If we return NULL - we can pretend that we actually noticed that * *ptask was updated when the previous task has exited. Or pretend * that probe_slab_address(&sighand) reads NULL. * * If we return the new task (because sighand is not NULL for any * reason) - this is fine too. This (new) task can't go away before * another gp pass. * * And note: We could even eliminate the false positive if re-read * task->sighand once again to avoid the falsely NULL. But this case * is very unlikely so we don't care. */ if (!sighand) return NULL; return task; } |
8f95c90ce sched/wait, RCU: ... |
280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 |
void rcuwait_wake_up(struct rcuwait *w) { struct task_struct *task; rcu_read_lock(); /* * Order condition vs @task, such that everything prior to the load * of @task is visible. This is the condition as to why the user called * rcuwait_trywake() in the first place. Pairs with set_current_state() * barrier (A) in rcuwait_wait_event(). * * WAIT WAKE * [S] tsk = current [S] cond = true * MB (A) MB (B) * [L] cond [L] tsk */ smp_rmb(); /* (B) */ /* * Avoid using task_rcu_dereference() magic as long as we are careful, * see comment in rcuwait_wait_event() regarding ->exit_state. */ task = rcu_dereference(w->task); if (task) wake_up_process(task); rcu_read_unlock(); } |
150593bf8 sched/api: Introd... |
308 |
/* |
1da177e4c Linux-2.6.12-rc2 |
309 310 311 312 313 314 315 |
* Determine if a process group is "orphaned", according to the POSIX * definition in 2.2.2.52. Orphaned process groups are not to be affected * by terminal-generated stop signals. Newly orphaned process groups are * to receive a SIGHUP and a SIGCONT. * * "I ask you, have you ever known what it is to be an orphan?" */ |
a0be55dee kernel/exit.c: fi... |
316 317 |
static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignored_task) |
1da177e4c Linux-2.6.12-rc2 |
318 319 |
{ struct task_struct *p; |
1da177e4c Linux-2.6.12-rc2 |
320 |
|
0475ac084 [PATCH] pid: use ... |
321 |
do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
05e83df62 will_become_orpha... |
322 323 324 |
if ((p == ignored_task) || (p->exit_state && thread_group_empty(p)) || is_global_init(p->real_parent)) |
1da177e4c Linux-2.6.12-rc2 |
325 |
continue; |
05e83df62 will_become_orpha... |
326 |
|
0475ac084 [PATCH] pid: use ... |
327 |
if (task_pgrp(p->real_parent) != pgrp && |
05e83df62 will_become_orpha... |
328 329 |
task_session(p->real_parent) == task_session(p)) return 0; |
0475ac084 [PATCH] pid: use ... |
330 |
} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
05e83df62 will_become_orpha... |
331 332 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
333 |
} |
3e7cd6c41 [PATCH] pid: repl... |
334 |
int is_current_pgrp_orphaned(void) |
1da177e4c Linux-2.6.12-rc2 |
335 336 337 338 |
{ int retval; read_lock(&tasklist_lock); |
3e7cd6c41 [PATCH] pid: repl... |
339 |
retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); |
1da177e4c Linux-2.6.12-rc2 |
340 341 342 343 |
read_unlock(&tasklist_lock); return retval; } |
961c4675c has_stopped_jobs:... |
344 |
static bool has_stopped_jobs(struct pid *pgrp) |
1da177e4c Linux-2.6.12-rc2 |
345 |
{ |
1da177e4c Linux-2.6.12-rc2 |
346 |
struct task_struct *p; |
0475ac084 [PATCH] pid: use ... |
347 |
do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
961c4675c has_stopped_jobs:... |
348 349 |
if (p->signal->flags & SIGNAL_STOP_STOPPED) return true; |
0475ac084 [PATCH] pid: use ... |
350 |
} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
961c4675c has_stopped_jobs:... |
351 352 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
353 |
} |
f49ee505b introduce kill_or... |
354 355 356 357 358 359 360 361 362 363 364 365 |
/* * Check to see if any process groups have become orphaned as * a result of our exiting, and if they have any stopped jobs, * send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ static void kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent) { struct pid *pgrp = task_pgrp(tsk); struct task_struct *ignored_task = tsk; if (!parent) |
a0be55dee kernel/exit.c: fi... |
366 367 368 |
/* exit: our father is in a different pgrp than * we are and we were the only connection outside. */ |
f49ee505b introduce kill_or... |
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 |
parent = tsk->real_parent; else /* reparent: our child is in a different pgrp than * we are, and it was the only connection outside. */ ignored_task = NULL; if (task_pgrp(parent) != pgrp && task_session(parent) == task_session(tsk) && will_become_orphaned_pgrp(pgrp, ignored_task) && has_stopped_jobs(pgrp)) { __kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp); __kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp); } } |
f98bafa06 memcg: kill CONFI... |
384 |
#ifdef CONFIG_MEMCG |
cf475ad28 cgroups: add an o... |
385 |
/* |
733eda7ac memcg: clear mm->... |
386 |
* A task is exiting. If it owned this mm, find a new owner for the mm. |
cf475ad28 cgroups: add an o... |
387 |
*/ |
cf475ad28 cgroups: add an o... |
388 389 390 391 392 |
void mm_update_next_owner(struct mm_struct *mm) { struct task_struct *c, *g, *p = current; retry: |
733eda7ac memcg: clear mm->... |
393 394 395 396 397 |
/* * If the exiting or execing task is not the owner, it's * someone else's problem. */ if (mm->owner != p) |
cf475ad28 cgroups: add an o... |
398 |
return; |
733eda7ac memcg: clear mm->... |
399 400 401 402 403 404 405 406 407 |
/* * The current owner is exiting/execing and there are no other * candidates. Do not leave the mm pointing to a possibly * freed task structure. */ if (atomic_read(&mm->mm_users) <= 1) { mm->owner = NULL; return; } |
cf475ad28 cgroups: add an o... |
408 409 410 411 412 413 414 415 416 417 418 419 420 |
read_lock(&tasklist_lock); /* * Search in the children */ list_for_each_entry(c, &p->children, sibling) { if (c->mm == mm) goto assign_new_owner; } /* * Search in the siblings */ |
dea33cfd9 ptrace: mm_need_n... |
421 |
list_for_each_entry(c, &p->real_parent->children, sibling) { |
cf475ad28 cgroups: add an o... |
422 423 424 425 426 |
if (c->mm == mm) goto assign_new_owner; } /* |
f87fb599a memcg: mm_update_... |
427 |
* Search through everything else, we should not get here often. |
cf475ad28 cgroups: add an o... |
428 |
*/ |
39af1765f memcg: optimize t... |
429 430 431 432 433 434 435 436 437 |
for_each_process(g) { if (g->flags & PF_KTHREAD) continue; for_each_thread(g, c) { if (c->mm == mm) goto assign_new_owner; if (c->mm) break; } |
f87fb599a memcg: mm_update_... |
438 |
} |
cf475ad28 cgroups: add an o... |
439 |
read_unlock(&tasklist_lock); |
31a78f23b mm owner: fix rac... |
440 441 442 |
/* * We found no owner yet mm_users > 1: this implies that we are * most likely racing with swapoff (try_to_unuse()) or /proc or |
e5991371e mm: remove cgroup... |
443 |
* ptrace or page migration (get_task_mm()). Mark owner as NULL. |
31a78f23b mm owner: fix rac... |
444 |
*/ |
31a78f23b mm owner: fix rac... |
445 |
mm->owner = NULL; |
cf475ad28 cgroups: add an o... |
446 447 448 449 450 451 452 453 454 455 |
return; assign_new_owner: BUG_ON(c == p); get_task_struct(c); /* * The task_lock protects c->mm from changing. * We always want mm->owner->mm == mm */ task_lock(c); |
e5991371e mm: remove cgroup... |
456 457 458 459 460 |
/* * Delay read_unlock() till we have the task_lock() * to ensure that c does not slip away underneath us */ read_unlock(&tasklist_lock); |
cf475ad28 cgroups: add an o... |
461 462 463 464 465 |
if (c->mm != mm) { task_unlock(c); put_task_struct(c); goto retry; } |
cf475ad28 cgroups: add an o... |
466 467 468 469 |
mm->owner = c; task_unlock(c); put_task_struct(c); } |
f98bafa06 memcg: kill CONFI... |
470 |
#endif /* CONFIG_MEMCG */ |
cf475ad28 cgroups: add an o... |
471 |
|
1da177e4c Linux-2.6.12-rc2 |
472 473 474 475 |
/* * Turn us into a lazy TLB process if we * aren't already.. */ |
0039962a1 kernel/exit: Comp... |
476 |
static void exit_mm(void) |
1da177e4c Linux-2.6.12-rc2 |
477 |
{ |
0039962a1 kernel/exit: Comp... |
478 |
struct mm_struct *mm = current->mm; |
b564daf80 coredump: constru... |
479 |
struct core_state *core_state; |
1da177e4c Linux-2.6.12-rc2 |
480 |
|
0039962a1 kernel/exit: Comp... |
481 |
mm_release(current, mm); |
1da177e4c Linux-2.6.12-rc2 |
482 483 |
if (!mm) return; |
4fe7efdbd mm: correctly syn... |
484 |
sync_mm_rss(mm); |
1da177e4c Linux-2.6.12-rc2 |
485 486 |
/* * Serialize with any possible pending coredump. |
999d9fc16 coredump: move mm... |
487 |
* We must hold mmap_sem around checking core_state |
1da177e4c Linux-2.6.12-rc2 |
488 |
* and clearing tsk->mm. The core-inducing thread |
999d9fc16 coredump: move mm... |
489 |
* will increment ->nr_threads for each thread in the |
1da177e4c Linux-2.6.12-rc2 |
490 491 492 |
* group with ->mm != NULL. */ down_read(&mm->mmap_sem); |
b564daf80 coredump: constru... |
493 494 495 |
core_state = mm->core_state; if (core_state) { struct core_thread self; |
a0be55dee kernel/exit.c: fi... |
496 |
|
1da177e4c Linux-2.6.12-rc2 |
497 |
up_read(&mm->mmap_sem); |
1da177e4c Linux-2.6.12-rc2 |
498 |
|
0039962a1 kernel/exit: Comp... |
499 |
self.task = current; |
b564daf80 coredump: constru... |
500 501 502 503 504 505 506 |
self.next = xchg(&core_state->dumper.next, &self); /* * Implies mb(), the result of xchg() must be visible * to core_state->dumper. */ if (atomic_dec_and_test(&core_state->nr_threads)) complete(&core_state->startup); |
1da177e4c Linux-2.6.12-rc2 |
507 |
|
a94e2d408 coredump: kill mm... |
508 |
for (;;) { |
642fa448a sched/core: Remov... |
509 |
set_current_state(TASK_UNINTERRUPTIBLE); |
a94e2d408 coredump: kill mm... |
510 511 |
if (!self.task) /* see coredump_finish() */ break; |
80d26af89 coredump: use a f... |
512 |
freezable_schedule(); |
a94e2d408 coredump: kill mm... |
513 |
} |
642fa448a sched/core: Remov... |
514 |
__set_current_state(TASK_RUNNING); |
1da177e4c Linux-2.6.12-rc2 |
515 516 |
down_read(&mm->mmap_sem); } |
f1f100764 mm: add new mmgra... |
517 |
mmgrab(mm); |
0039962a1 kernel/exit: Comp... |
518 |
BUG_ON(mm != current->active_mm); |
1da177e4c Linux-2.6.12-rc2 |
519 |
/* more a memory barrier than a real lock */ |
0039962a1 kernel/exit: Comp... |
520 521 |
task_lock(current); current->mm = NULL; |
1da177e4c Linux-2.6.12-rc2 |
522 523 |
up_read(&mm->mmap_sem); enter_lazy_tlb(mm, current); |
0039962a1 kernel/exit: Comp... |
524 |
task_unlock(current); |
cf475ad28 cgroups: add an o... |
525 |
mm_update_next_owner(mm); |
1da177e4c Linux-2.6.12-rc2 |
526 |
mmput(mm); |
c32b3cbe0 oom, PM: make OOM... |
527 |
if (test_thread_flag(TIF_MEMDIE)) |
38531201c mm, oom: enforce ... |
528 |
exit_oom_victim(); |
1da177e4c Linux-2.6.12-rc2 |
529 |
} |
c9dc05bfd exit: reparent: i... |
530 531 532 533 534 535 536 537 538 539 |
static struct task_struct *find_alive_thread(struct task_struct *p) { struct task_struct *t; for_each_thread(p, t) { if (!(t->flags & PF_EXITING)) return t; } return NULL; } |
1109909c7 exit: reparent: i... |
540 541 542 543 544 545 546 547 548 |
static struct task_struct *find_child_reaper(struct task_struct *father) __releases(&tasklist_lock) __acquires(&tasklist_lock) { struct pid_namespace *pid_ns = task_active_pid_ns(father); struct task_struct *reaper = pid_ns->child_reaper; if (likely(reaper != father)) return reaper; |
c9dc05bfd exit: reparent: i... |
549 550 |
reaper = find_alive_thread(father); if (reaper) { |
1109909c7 exit: reparent: i... |
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 |
pid_ns->child_reaper = reaper; return reaper; } write_unlock_irq(&tasklist_lock); if (unlikely(pid_ns == &init_pid_ns)) { panic("Attempted to kill init! exitcode=0x%08x ", father->signal->group_exit_code ?: father->exit_code); } zap_pid_ns_processes(pid_ns); write_lock_irq(&tasklist_lock); return father; } |
1da177e4c Linux-2.6.12-rc2 |
566 |
/* |
ebec18a6d prctl: add PR_{SE... |
567 568 569 570 571 |
* When we die, we re-parent all our children, and try to: * 1. give them to another thread in our thread group, if such a member exists * 2. give it to the first ancestor process which prctl'd itself as a * child_subreaper for its children (like a service manager) * 3. give it to the init process (PID 1) in our pid namespace |
1da177e4c Linux-2.6.12-rc2 |
572 |
*/ |
1109909c7 exit: reparent: i... |
573 574 |
static struct task_struct *find_new_reaper(struct task_struct *father, struct task_struct *child_reaper) |
1da177e4c Linux-2.6.12-rc2 |
575 |
{ |
c9dc05bfd exit: reparent: i... |
576 |
struct task_struct *thread, *reaper; |
1da177e4c Linux-2.6.12-rc2 |
577 |
|
c9dc05bfd exit: reparent: i... |
578 579 |
thread = find_alive_thread(father); if (thread) |
950bbabb5 pid_ns: (BUG 1139... |
580 |
return thread; |
1da177e4c Linux-2.6.12-rc2 |
581 |
|
7d24e2df5 exit: reparent: f... |
582 |
if (father->signal->has_child_subreaper) { |
c6c70f445 exit: fix the set... |
583 |
unsigned int ns_level = task_pid(father)->level; |
ebec18a6d prctl: add PR_{SE... |
584 |
/* |
175aed3f8 exit: reparent: d... |
585 |
* Find the first ->is_child_subreaper ancestor in our pid_ns. |
c6c70f445 exit: fix the set... |
586 587 588 589 590 |
* We can't check reaper != child_reaper to ensure we do not * cross the namespaces, the exiting parent could be injected * by setns() + fork(). * We check pid->level, this is slightly more efficient than * task_active_pid_ns(reaper) != task_active_pid_ns(father). |
ebec18a6d prctl: add PR_{SE... |
591 |
*/ |
c6c70f445 exit: fix the set... |
592 593 |
for (reaper = father->real_parent; task_pid(reaper)->level == ns_level; |
ebec18a6d prctl: add PR_{SE... |
594 |
reaper = reaper->real_parent) { |
175aed3f8 exit: reparent: d... |
595 |
if (reaper == &init_task) |
ebec18a6d prctl: add PR_{SE... |
596 597 598 |
break; if (!reaper->signal->is_child_subreaper) continue; |
c9dc05bfd exit: reparent: i... |
599 600 601 |
thread = find_alive_thread(reaper); if (thread) return thread; |
ebec18a6d prctl: add PR_{SE... |
602 |
} |
1da177e4c Linux-2.6.12-rc2 |
603 |
} |
762a24bee pid namespaces: r... |
604 |
|
1109909c7 exit: reparent: i... |
605 |
return child_reaper; |
950bbabb5 pid_ns: (BUG 1139... |
606 |
} |
5dfc80be7 forget_original_p... |
607 608 609 |
/* * Any that need to be release_task'd are put on the @dead list. */ |
9cd80bbb0 do_wait() optimiz... |
610 |
static void reparent_leader(struct task_struct *father, struct task_struct *p, |
5dfc80be7 forget_original_p... |
611 612 |
struct list_head *dead) { |
2831096e2 exit: reparent: c... |
613 |
if (unlikely(p->exit_state == EXIT_DEAD)) |
5dfc80be7 forget_original_p... |
614 |
return; |
abd50b39e wait: introduce E... |
615 |
/* We don't want people slaying init. */ |
5dfc80be7 forget_original_p... |
616 617 618 |
p->exit_signal = SIGCHLD; /* If it has exited notify the new parent about this child's death. */ |
d21142ece ptrace: kill task... |
619 |
if (!p->ptrace && |
5dfc80be7 forget_original_p... |
620 |
p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) { |
867734737 make do_notify_pa... |
621 |
if (do_notify_parent(p, p->exit_signal)) { |
5dfc80be7 forget_original_p... |
622 |
p->exit_state = EXIT_DEAD; |
dc2fd4b00 exit: reparent: u... |
623 |
list_add(&p->ptrace_entry, dead); |
5dfc80be7 forget_original_p... |
624 625 626 627 628 |
} } kill_orphaned_pgrp(p, father); } |
482a3767e exit: reparent: c... |
629 630 631 632 633 634 635 636 637 638 |
/* * This does two things: * * A. Make init inherit all the child processes * B. Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ static void forget_original_parent(struct task_struct *father, struct list_head *dead) |
1da177e4c Linux-2.6.12-rc2 |
639 |
{ |
482a3767e exit: reparent: c... |
640 |
struct task_struct *p, *t, *reaper; |
762a24bee pid namespaces: r... |
641 |
|
7c8bd2322 exit: ptrace: shi... |
642 |
if (unlikely(!list_empty(&father->ptraced))) |
482a3767e exit: reparent: c... |
643 |
exit_ptrace(father, dead); |
f470021ad ptrace children r... |
644 |
|
7c8bd2322 exit: ptrace: shi... |
645 |
/* Can drop and reacquire tasklist_lock */ |
1109909c7 exit: reparent: i... |
646 |
reaper = find_child_reaper(father); |
ad9e206ae exit: reparent: a... |
647 |
if (list_empty(&father->children)) |
482a3767e exit: reparent: c... |
648 |
return; |
1109909c7 exit: reparent: i... |
649 650 |
reaper = find_new_reaper(father, reaper); |
2831096e2 exit: reparent: c... |
651 |
list_for_each_entry(p, &father->children, sibling) { |
57a059187 exit: reparent: c... |
652 |
for_each_thread(p, t) { |
9cd80bbb0 do_wait() optimiz... |
653 |
t->real_parent = reaper; |
57a059187 exit: reparent: c... |
654 655 |
BUG_ON((!t->ptrace) != (t->parent == father)); if (likely(!t->ptrace)) |
9cd80bbb0 do_wait() optimiz... |
656 |
t->parent = t->real_parent; |
9cd80bbb0 do_wait() optimiz... |
657 658 659 |
if (t->pdeath_signal) group_send_sig_info(t->pdeath_signal, SEND_SIG_NOINFO, t); |
57a059187 exit: reparent: c... |
660 |
} |
2831096e2 exit: reparent: c... |
661 662 663 664 665 |
/* * If this is a threaded reparent there is no need to * notify anyone anything has happened. */ if (!same_thread_group(reaper, father)) |
482a3767e exit: reparent: c... |
666 |
reparent_leader(father, p, dead); |
1da177e4c Linux-2.6.12-rc2 |
667 |
} |
2831096e2 exit: reparent: c... |
668 |
list_splice_tail_init(&father->children, &reaper->children); |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 672 673 674 |
} /* * Send signals to all our closest relatives so that they know * to properly mourn us.. */ |
821c7de71 exit_notify: fix ... |
675 |
static void exit_notify(struct task_struct *tsk, int group_dead) |
1da177e4c Linux-2.6.12-rc2 |
676 |
{ |
53c8f9f19 make do_notify_pa... |
677 |
bool autoreap; |
482a3767e exit: reparent: c... |
678 679 |
struct task_struct *p, *n; LIST_HEAD(dead); |
1da177e4c Linux-2.6.12-rc2 |
680 |
|
762a24bee pid namespaces: r... |
681 |
write_lock_irq(&tasklist_lock); |
482a3767e exit: reparent: c... |
682 |
forget_original_parent(tsk, &dead); |
821c7de71 exit_notify: fix ... |
683 684 |
if (group_dead) kill_orphaned_pgrp(tsk->group_leader, NULL); |
1da177e4c Linux-2.6.12-rc2 |
685 |
|
45cdf5cc0 kill tracehook_no... |
686 687 688 689 690 691 692 693 694 695 696 697 |
if (unlikely(tsk->ptrace)) { int sig = thread_group_leader(tsk) && thread_group_empty(tsk) && !ptrace_reparented(tsk) ? tsk->exit_signal : SIGCHLD; autoreap = do_notify_parent(tsk, sig); } else if (thread_group_leader(tsk)) { autoreap = thread_group_empty(tsk) && do_notify_parent(tsk, tsk->exit_signal); } else { autoreap = true; } |
1da177e4c Linux-2.6.12-rc2 |
698 |
|
53c8f9f19 make do_notify_pa... |
699 |
tsk->exit_state = autoreap ? EXIT_DEAD : EXIT_ZOMBIE; |
6c66e7dba exit: exit_notify... |
700 701 |
if (tsk->exit_state == EXIT_DEAD) list_add(&tsk->ptrace_entry, &dead); |
1da177e4c Linux-2.6.12-rc2 |
702 |
|
9c3391684 exit: exit_notify... |
703 704 |
/* mt-exec, de_thread() is waiting for group leader */ if (unlikely(tsk->signal->notify_count < 0)) |
6db840fa7 exec: RT sub-thre... |
705 |
wake_up_process(tsk->signal->group_exit_task); |
1da177e4c Linux-2.6.12-rc2 |
706 |
write_unlock_irq(&tasklist_lock); |
482a3767e exit: reparent: c... |
707 708 709 710 |
list_for_each_entry_safe(p, n, &dead, ptrace_entry) { list_del_init(&p->ptrace_entry); release_task(p); } |
1da177e4c Linux-2.6.12-rc2 |
711 |
} |
e18eecb8b Add generic exit-... |
712 713 714 715 716 |
#ifdef CONFIG_DEBUG_STACK_USAGE static void check_stack_usage(void) { static DEFINE_SPINLOCK(low_water_lock); static int lowest_to_date = THREAD_SIZE; |
e18eecb8b Add generic exit-... |
717 |
unsigned long free; |
7c9f8861e stackprotector: u... |
718 |
free = stack_not_used(current); |
e18eecb8b Add generic exit-... |
719 720 721 722 723 724 |
if (free >= lowest_to_date) return; spin_lock(&low_water_lock); if (free < lowest_to_date) { |
627393d44 kernel/exit.c: qu... |
725 726 |
pr_info("%s (%d) used greatest stack depth: %lu bytes left ", |
a0be55dee kernel/exit.c: fi... |
727 |
current->comm, task_pid_nr(current), free); |
e18eecb8b Add generic exit-... |
728 729 730 731 732 733 734 |
lowest_to_date = free; } spin_unlock(&low_water_lock); } #else static inline void check_stack_usage(void) {} #endif |
9af6528ee sched/core: Optim... |
735 |
void __noreturn do_exit(long code) |
1da177e4c Linux-2.6.12-rc2 |
736 737 738 739 740 |
{ struct task_struct *tsk = current; int group_dead; profile_task_exit(tsk); |
5c9a8750a kernel: add kcov ... |
741 |
kcov_task_exit(tsk); |
1da177e4c Linux-2.6.12-rc2 |
742 |
|
73c101011 block: initial pa... |
743 |
WARN_ON(blk_needs_flush_plug(tsk)); |
22e2c507c [PATCH] Update cf... |
744 |
|
1da177e4c Linux-2.6.12-rc2 |
745 746 747 748 |
if (unlikely(in_interrupt())) panic("Aiee, killing interrupt handler!"); if (unlikely(!tsk->pid)) panic("Attempted to kill the idle task!"); |
1da177e4c Linux-2.6.12-rc2 |
749 |
|
33dd94ae1 do_exit(): make s... |
750 751 752 753 754 755 756 757 |
/* * If do_exit is called because this processes oopsed, it's possible * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before * continuing. Amongst other possible reasons, this is to prevent * mm_release()->clear_child_tid() from writing to a user-controlled * kernel address. */ set_fs(USER_DS); |
a288eecce ptrace: kill triv... |
758 |
ptrace_event(PTRACE_EVENT_EXIT, code); |
1da177e4c Linux-2.6.12-rc2 |
759 |
|
e0e817392 CRED: Add some co... |
760 |
validate_creds_for_do_exit(tsk); |
df164db5f [PATCH] avoid res... |
761 762 763 764 765 |
/* * We're taking recursive faults here in do_exit. Safest is to just * leave this task alone and wait for reboot. */ if (unlikely(tsk->flags & PF_EXITING)) { |
a0be55dee kernel/exit.c: fi... |
766 767 |
pr_alert("Fixing recursive fault but reboot is needed! "); |
778e9a9c3 pi-futex: fix exi... |
768 769 770 771 772 773 774 775 776 777 |
/* * We can do this unlocked here. The futex code uses * this flag just to verify whether the pi state * cleanup has been done or not. In the worst case it * loops once more. We pretend that the cleanup was * done as there is no way to return. Either the * OWNER_DIED bit is set by now or we push the blocked * task into the wait for ever nirwana as well. */ tsk->flags |= PF_EXITPIDONE; |
df164db5f [PATCH] avoid res... |
778 779 780 |
set_current_state(TASK_UNINTERRUPTIBLE); schedule(); } |
d12619b5f fix group stop wi... |
781 |
exit_signals(tsk); /* sets PF_EXITING */ |
778e9a9c3 pi-futex: fix exi... |
782 |
/* |
be3e78449 locking/spinlock:... |
783 784 |
* Ensure that all new tsk->pi_lock acquisitions must observe * PF_EXITING. Serializes against futex.c:attach_to_pi_owner(). |
778e9a9c3 pi-futex: fix exi... |
785 |
*/ |
d2ee7198c pi-futex: set PF_... |
786 |
smp_mb(); |
be3e78449 locking/spinlock:... |
787 788 789 790 |
/* * Ensure that we must observe the pi_state in exit_mm() -> * mm_release() -> exit_pi_state_list(). */ |
8083f2934 exit: Replace spi... |
791 792 |
raw_spin_lock_irq(&tsk->pi_lock); raw_spin_unlock_irq(&tsk->pi_lock); |
1da177e4c Linux-2.6.12-rc2 |
793 |
|
1dc0fffc4 sched/core: Robus... |
794 |
if (unlikely(in_atomic())) { |
a0be55dee kernel/exit.c: fi... |
795 796 797 798 |
pr_info("note: %s[%d] exited with preempt_count %d ", current->comm, task_pid_nr(current), preempt_count()); |
1dc0fffc4 sched/core: Robus... |
799 800 |
preempt_count_set(PREEMPT_ENABLED); } |
1da177e4c Linux-2.6.12-rc2 |
801 |
|
48d212a2e Revert "mm: corre... |
802 803 804 |
/* sync mm's RSS info before statistics gathering */ if (tsk->mm) sync_mm_rss(tsk->mm); |
51229b495 exit,stats: /* ob... |
805 |
acct_update_integrals(tsk); |
1da177e4c Linux-2.6.12-rc2 |
806 |
group_dead = atomic_dec_and_test(&tsk->signal->live); |
c30689516 [PATCH] revert "t... |
807 |
if (group_dead) { |
baa73d9e4 posix-timers: Mak... |
808 |
#ifdef CONFIG_POSIX_TIMERS |
778e9a9c3 pi-futex: fix exi... |
809 |
hrtimer_cancel(&tsk->signal->real_timer); |
25f407f0b [PATCH] Call exit... |
810 |
exit_itimers(tsk->signal); |
baa73d9e4 posix-timers: Mak... |
811 |
#endif |
1f10206cf getrusage: fill r... |
812 813 |
if (tsk->mm) setmax_mm_hiwater_rss(&tsk->signal->maxrss, tsk->mm); |
c30689516 [PATCH] revert "t... |
814 |
} |
f6ec29a42 [PATCH] pacct: av... |
815 |
acct_collect(code, group_dead); |
522ed7767 Audit: add TTY in... |
816 817 |
if (group_dead) tty_audit_exit(); |
a4ff8dba7 audit: inline aud... |
818 |
audit_free(tsk); |
115085ea0 [PATCH] taskstats... |
819 |
|
48d212a2e Revert "mm: corre... |
820 |
tsk->exit_code = code; |
115085ea0 [PATCH] taskstats... |
821 |
taskstats_exit(tsk, group_dead); |
c757249af [PATCH] per-task-... |
822 |
|
0039962a1 kernel/exit: Comp... |
823 |
exit_mm(); |
1da177e4c Linux-2.6.12-rc2 |
824 |
|
0e4648141 [PATCH] pacct: ad... |
825 |
if (group_dead) |
f6ec29a42 [PATCH] pacct: av... |
826 |
acct_process(); |
0a16b6075 tracing, sched: L... |
827 |
trace_sched_process_exit(tsk); |
1da177e4c Linux-2.6.12-rc2 |
828 |
exit_sem(tsk); |
b34a6b1da ipc: introduce sh... |
829 |
exit_shm(tsk); |
1ec7f1ddb [PATCH] get rid o... |
830 831 |
exit_files(tsk); exit_fs(tsk); |
c39df5fa3 exit: call disass... |
832 833 |
if (group_dead) disassociate_ctty(1); |
8aac62706 move exit_task_na... |
834 |
exit_task_namespaces(tsk); |
ed3e694d7 move exit_task_wo... |
835 |
exit_task_work(tsk); |
e64646946 exit_thread: acce... |
836 |
exit_thread(tsk); |
0b3fcf178 perf_events: Move... |
837 838 839 840 841 842 843 844 |
/* * Flush inherited counters to the parent - before the parent * gets woken up by child-exit notifications. * * because of cgroup mode, must be called before cgroup_exit() */ perf_event_exit_task(tsk); |
8e5bfa8c1 sched/autogroup: ... |
845 |
sched_autogroup_exit_task(tsk); |
1ec41830e cgroup: remove us... |
846 |
cgroup_exit(tsk); |
1da177e4c Linux-2.6.12-rc2 |
847 |
|
33b2fb303 perf_counter: fix... |
848 |
/* |
24f1e32c6 hw-breakpoints: R... |
849 850 |
* FIXME: do that only when needed, using sched_exit tracepoint */ |
7c8df2863 ptrace: revert "P... |
851 |
flush_ptrace_hw_breakpoint(tsk); |
33b2fb303 perf_counter: fix... |
852 |
|
ccdd29fff rcu: Create reaso... |
853 |
exit_tasks_rcu_start(); |
821c7de71 exit_notify: fix ... |
854 |
exit_notify(tsk, group_dead); |
ef9823939 kernel/exit.c: ca... |
855 |
proc_exit_connector(tsk); |
c11600e4f mm, mempolicy: ta... |
856 |
mpol_put_task_policy(tsk); |
42b2dd0a0 Shrink task_struc... |
857 |
#ifdef CONFIG_FUTEX |
c87e2837b [PATCH] pi-futex:... |
858 859 |
if (unlikely(current->pi_state_cache)) kfree(current->pi_state_cache); |
42b2dd0a0 Shrink task_struc... |
860 |
#endif |
c87e2837b [PATCH] pi-futex:... |
861 |
/* |
9a11b49a8 [PATCH] lockdep: ... |
862 |
* Make sure we are holding no locks: |
de5097c2e [PATCH] mutex sub... |
863 |
*/ |
1b1d2fb44 lockdep: remove t... |
864 |
debug_check_no_locks_held(); |
778e9a9c3 pi-futex: fix exi... |
865 866 867 868 869 870 |
/* * We can do this unlocked here. The futex code uses this flag * just to verify whether the pi state cleanup has been done * or not. In the worst case it loops once more. */ tsk->flags |= PF_EXITPIDONE; |
1da177e4c Linux-2.6.12-rc2 |
871 |
|
afc847b7d [PATCH] don't do ... |
872 |
if (tsk->io_context) |
b69f22920 block: Fix io_con... |
873 |
exit_io_context(tsk); |
afc847b7d [PATCH] don't do ... |
874 |
|
b92ce5589 [PATCH] splice: a... |
875 |
if (tsk->splice_pipe) |
4b8a8f1e4 get rid of the la... |
876 |
free_pipe_info(tsk->splice_pipe); |
b92ce5589 [PATCH] splice: a... |
877 |
|
5640f7685 net: use a per ta... |
878 879 |
if (tsk->task_frag.page) put_page(tsk->task_frag.page); |
e0e817392 CRED: Add some co... |
880 |
validate_creds_for_do_exit(tsk); |
4bcb8232c exit: move check_... |
881 |
check_stack_usage(); |
7407251a0 [PATCH] PF_DEAD c... |
882 |
preempt_disable(); |
54848d73f writeback: charge... |
883 884 |
if (tsk->nr_dirtied) __this_cpu_add(dirty_throttle_leaks, tsk->nr_dirtied); |
f41d911f8 rcu: Merge preemp... |
885 |
exit_rcu(); |
ccdd29fff rcu: Create reaso... |
886 |
exit_tasks_rcu_finish(); |
b5740f4b2 sched: Fix ancien... |
887 |
|
b09be676e locking/lockdep: ... |
888 |
lockdep_free_task(tsk); |
9af6528ee sched/core: Optim... |
889 |
do_task_dead(); |
1da177e4c Linux-2.6.12-rc2 |
890 |
} |
012914dad [patch] MCA recov... |
891 |
EXPORT_SYMBOL_GPL(do_exit); |
9402c95f3 treewide: remove ... |
892 |
void complete_and_exit(struct completion *comp, long code) |
1da177e4c Linux-2.6.12-rc2 |
893 894 895 |
{ if (comp) complete(comp); |
55a101f8f [PATCH] kill PF_D... |
896 |
|
1da177e4c Linux-2.6.12-rc2 |
897 898 |
do_exit(code); } |
1da177e4c Linux-2.6.12-rc2 |
899 |
EXPORT_SYMBOL(complete_and_exit); |
754fe8d29 [CVE-2009-0029] S... |
900 |
SYSCALL_DEFINE1(exit, int, error_code) |
1da177e4c Linux-2.6.12-rc2 |
901 902 903 |
{ do_exit((error_code&0xff)<<8); } |
1da177e4c Linux-2.6.12-rc2 |
904 905 906 907 |
/* * Take down every thread in the group. This is called by fatal signals * as well as by sys_exit_group (below). */ |
9402c95f3 treewide: remove ... |
908 |
void |
1da177e4c Linux-2.6.12-rc2 |
909 910 |
do_group_exit(int exit_code) { |
bfc4b0890 signals: do_group... |
911 |
struct signal_struct *sig = current->signal; |
1da177e4c Linux-2.6.12-rc2 |
912 |
BUG_ON(exit_code & 0x80); /* core dumps don't get here */ |
bfc4b0890 signals: do_group... |
913 914 |
if (signal_group_exit(sig)) exit_code = sig->group_exit_code; |
1da177e4c Linux-2.6.12-rc2 |
915 |
else if (!thread_group_empty(current)) { |
1da177e4c Linux-2.6.12-rc2 |
916 |
struct sighand_struct *const sighand = current->sighand; |
a0be55dee kernel/exit.c: fi... |
917 |
|
1da177e4c Linux-2.6.12-rc2 |
918 |
spin_lock_irq(&sighand->siglock); |
ed5d2cac1 exec: rework the ... |
919 |
if (signal_group_exit(sig)) |
1da177e4c Linux-2.6.12-rc2 |
920 921 922 |
/* Another thread got here before we took the lock. */ exit_code = sig->group_exit_code; else { |
1da177e4c Linux-2.6.12-rc2 |
923 |
sig->group_exit_code = exit_code; |
ed5d2cac1 exec: rework the ... |
924 |
sig->flags = SIGNAL_GROUP_EXIT; |
1da177e4c Linux-2.6.12-rc2 |
925 926 927 |
zap_other_threads(current); } spin_unlock_irq(&sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
928 929 930 931 932 933 934 935 936 937 938 |
} do_exit(exit_code); /* NOTREACHED */ } /* * this kills every thread in the thread group. Note that any externally * wait4()-ing process will get the correct exit code - even if this * thread is not the thread group leader. */ |
754fe8d29 [CVE-2009-0029] S... |
939 |
SYSCALL_DEFINE1(exit_group, int, error_code) |
1da177e4c Linux-2.6.12-rc2 |
940 941 |
{ do_group_exit((error_code & 0xff) << 8); |
2ed7c03ec [CVE-2009-0029] C... |
942 943 |
/* NOTREACHED */ return 0; |
1da177e4c Linux-2.6.12-rc2 |
944 |
} |
67d7ddded waitid(2): leave ... |
945 946 947 948 949 950 |
struct waitid_info { pid_t pid; uid_t uid; int status; int cause; }; |
9e8ae01d1 introduce "struct... |
951 952 |
struct wait_opts { enum pid_type wo_type; |
9e8ae01d1 introduce "struct... |
953 |
int wo_flags; |
e1eb1ebcc mm: exit.c reorde... |
954 |
struct pid *wo_pid; |
9e8ae01d1 introduce "struct... |
955 |
|
67d7ddded waitid(2): leave ... |
956 |
struct waitid_info *wo_info; |
359566fae kernel_wait4()/ke... |
957 |
int wo_stat; |
ce72a16fa wait4(2)/waitid(2... |
958 |
struct rusage *wo_rusage; |
9e8ae01d1 introduce "struct... |
959 |
|
ac6424b98 sched/wait: Renam... |
960 |
wait_queue_entry_t child_wait; |
9e8ae01d1 introduce "struct... |
961 962 |
int notask_error; }; |
989264f46 do_wait-wakeup-op... |
963 964 |
static inline struct pid *task_pid_type(struct task_struct *task, enum pid_type type) |
161550d74 pid: sys_wait... ... |
965 |
{ |
989264f46 do_wait-wakeup-op... |
966 967 968 |
if (type != PIDTYPE_PID) task = task->group_leader; return task->pids[type].pid; |
161550d74 pid: sys_wait... ... |
969 |
} |
989264f46 do_wait-wakeup-op... |
970 |
static int eligible_pid(struct wait_opts *wo, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
971 |
{ |
5c01ba49e do_wait-wakeup-op... |
972 973 974 |
return wo->wo_type == PIDTYPE_MAX || task_pid_type(p, wo->wo_type) == wo->wo_pid; } |
1da177e4c Linux-2.6.12-rc2 |
975 |
|
bf959931d wait/ptrace: assu... |
976 977 |
static int eligible_child(struct wait_opts *wo, bool ptrace, struct task_struct *p) |
5c01ba49e do_wait-wakeup-op... |
978 979 980 |
{ if (!eligible_pid(wo, p)) return 0; |
bf959931d wait/ptrace: assu... |
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 |
/* * Wait for all children (clone and not) if __WALL is set or * if it is traced by us. */ if (ptrace || (wo->wo_flags & __WALL)) return 1; /* * Otherwise, wait for clone children *only* if __WCLONE is set; * otherwise, wait for non-clone children *only*. * * Note: a "clone" child here is one that reports to its parent * using a signal other than SIGCHLD, or a non-leader thread which * we can only see if it is traced by us. */ if ((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE)) |
1da177e4c Linux-2.6.12-rc2 |
998 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
999 |
|
14dd0b814 do_wait: return s... |
1000 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
1001 |
} |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 1005 1006 1007 |
/* * Handle sys_wait4 work for one task in state EXIT_ZOMBIE. We hold * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */ |
9e8ae01d1 introduce "struct... |
1008 |
static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1009 |
{ |
67d7ddded waitid(2): leave ... |
1010 |
int state, status; |
6c5f3e7b4 Pidns: make full ... |
1011 |
pid_t pid = task_pid_vnr(p); |
43e13cc10 cred: remove task... |
1012 |
uid_t uid = from_kuid_munged(current_user_ns(), task_uid(p)); |
67d7ddded waitid(2): leave ... |
1013 |
struct waitid_info *infop; |
1da177e4c Linux-2.6.12-rc2 |
1014 |
|
9e8ae01d1 introduce "struct... |
1015 |
if (!likely(wo->wo_flags & WEXITED)) |
98abed020 do_wait reorganiz... |
1016 |
return 0; |
9e8ae01d1 introduce "struct... |
1017 |
if (unlikely(wo->wo_flags & WNOWAIT)) { |
76d9871e1 wait_task_zombie:... |
1018 |
status = p->exit_code; |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 |
get_task_struct(p); read_unlock(&tasklist_lock); |
1029a2b52 sched, exit: Deal... |
1021 |
sched_annotate_sleep(); |
e61a25022 lift getrusage() ... |
1022 1023 |
if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); |
bb380ec33 kill wait_noreap_... |
1024 |
put_task_struct(p); |
76d9871e1 wait_task_zombie:... |
1025 |
goto out_info; |
1da177e4c Linux-2.6.12-rc2 |
1026 |
} |
1da177e4c Linux-2.6.12-rc2 |
1027 |
/* |
abd50b39e wait: introduce E... |
1028 |
* Move the task's state to DEAD/TRACE, only one thread can do this. |
1da177e4c Linux-2.6.12-rc2 |
1029 |
*/ |
f6507f83b exit: wait: clean... |
1030 1031 |
state = (ptrace_reparented(p) && thread_group_leader(p)) ? EXIT_TRACE : EXIT_DEAD; |
abd50b39e wait: introduce E... |
1032 |
if (cmpxchg(&p->exit_state, EXIT_ZOMBIE, state) != EXIT_ZOMBIE) |
1da177e4c Linux-2.6.12-rc2 |
1033 |
return 0; |
986094dfe exit: wait: drop ... |
1034 1035 1036 1037 1038 |
/* * We own this thread, nobody else can reap it. */ read_unlock(&tasklist_lock); sched_annotate_sleep(); |
f6507f83b exit: wait: clean... |
1039 |
|
befca9677 ptrace: wait_task... |
1040 |
/* |
f6507f83b exit: wait: clean... |
1041 |
* Check thread_group_leader() to exclude the traced sub-threads. |
befca9677 ptrace: wait_task... |
1042 |
*/ |
f6507f83b exit: wait: clean... |
1043 |
if (state == EXIT_DEAD && thread_group_leader(p)) { |
f953ccd00 exit: wait: don't... |
1044 1045 |
struct signal_struct *sig = p->signal; struct signal_struct *psig = current->signal; |
1f10206cf getrusage: fill r... |
1046 |
unsigned long maxrss; |
5613fda9a sched/cputime: Co... |
1047 |
u64 tgutime, tgstime; |
3795e1616 [PATCH] Decrease ... |
1048 |
|
1da177e4c Linux-2.6.12-rc2 |
1049 1050 1051 1052 1053 1054 1055 1056 |
/* * The resource counters for the group leader are in its * own task_struct. Those for dead threads in the group * are in its signal_struct, as are those for the child * processes it has previously reaped. All these * accumulate in the parent's signal_struct c* fields. * * We don't bother to take a lock here to protect these |
f953ccd00 exit: wait: don't... |
1057 1058 1059 1060 1061 1062 1063 |
* p->signal fields because the whole thread group is dead * and nobody can change them. * * psig->stats_lock also protects us from our sub-theads * which can reap other children at the same time. Until * we change k_getrusage()-like users to rely on this lock * we have to take ->siglock as well. |
0cf55e1ec sched, cputime: I... |
1064 |
* |
a0be55dee kernel/exit.c: fi... |
1065 1066 1067 |
* We use thread_group_cputime_adjusted() to get times for * the thread group, which consolidates times for all threads * in the group including the group leader. |
1da177e4c Linux-2.6.12-rc2 |
1068 |
*/ |
e80d0a1ae cputime: Rename t... |
1069 |
thread_group_cputime_adjusted(p, &tgutime, &tgstime); |
f953ccd00 exit: wait: don't... |
1070 |
spin_lock_irq(¤t->sighand->siglock); |
e78c34967 time, signal: Pro... |
1071 |
write_seqlock(&psig->stats_lock); |
648616343 [S390] cputime: a... |
1072 1073 |
psig->cutime += tgutime + sig->cutime; psig->cstime += tgstime + sig->cstime; |
6fac4829c cputime: Use acce... |
1074 |
psig->cgtime += task_gtime(p) + sig->gtime + sig->cgtime; |
3795e1616 [PATCH] Decrease ... |
1075 1076 1077 1078 1079 1080 1081 1082 |
psig->cmin_flt += p->min_flt + sig->min_flt + sig->cmin_flt; psig->cmaj_flt += p->maj_flt + sig->maj_flt + sig->cmaj_flt; psig->cnvcsw += p->nvcsw + sig->nvcsw + sig->cnvcsw; psig->cnivcsw += p->nivcsw + sig->nivcsw + sig->cnivcsw; |
6eaeeaba3 getrusage(): fill... |
1083 1084 1085 1086 1087 1088 |
psig->cinblock += task_io_get_inblock(p) + sig->inblock + sig->cinblock; psig->coublock += task_io_get_oublock(p) + sig->oublock + sig->coublock; |
1f10206cf getrusage: fill r... |
1089 1090 1091 |
maxrss = max(sig->maxrss, sig->cmaxrss); if (psig->cmaxrss < maxrss) psig->cmaxrss = maxrss; |
5995477ab task IO accountin... |
1092 1093 |
task_io_accounting_add(&psig->ioac, &p->ioac); task_io_accounting_add(&psig->ioac, &sig->ioac); |
e78c34967 time, signal: Pro... |
1094 |
write_sequnlock(&psig->stats_lock); |
f953ccd00 exit: wait: don't... |
1095 |
spin_unlock_irq(¤t->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1096 |
} |
ce72a16fa wait4(2)/waitid(2... |
1097 1098 |
if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); |
1da177e4c Linux-2.6.12-rc2 |
1099 1100 |
status = (p->signal->flags & SIGNAL_GROUP_EXIT) ? p->signal->group_exit_code : p->exit_code; |
359566fae kernel_wait4()/ke... |
1101 |
wo->wo_stat = status; |
2f4e6e2a8 wait_task_zombie:... |
1102 |
|
b43606905 wait: use EXIT_TR... |
1103 |
if (state == EXIT_TRACE) { |
1da177e4c Linux-2.6.12-rc2 |
1104 |
write_lock_irq(&tasklist_lock); |
2f4e6e2a8 wait_task_zombie:... |
1105 1106 |
/* We dropped tasklist, ptracer could die and untrace */ ptrace_unlink(p); |
b43606905 wait: use EXIT_TR... |
1107 1108 1109 1110 1111 |
/* If parent wants a zombie, don't release it now */ state = EXIT_ZOMBIE; if (do_notify_parent(p, p->exit_signal)) state = EXIT_DEAD; |
abd50b39e wait: introduce E... |
1112 |
p->exit_state = state; |
1da177e4c Linux-2.6.12-rc2 |
1113 1114 |
write_unlock_irq(&tasklist_lock); } |
abd50b39e wait: introduce E... |
1115 |
if (state == EXIT_DEAD) |
1da177e4c Linux-2.6.12-rc2 |
1116 |
release_task(p); |
2f4e6e2a8 wait_task_zombie:... |
1117 |
|
76d9871e1 wait_task_zombie:... |
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 |
out_info: infop = wo->wo_info; if (infop) { if ((status & 0x7f) == 0) { infop->cause = CLD_EXITED; infop->status = status >> 8; } else { infop->cause = (status & 0x80) ? CLD_DUMPED : CLD_KILLED; infop->status = status & 0x7f; } infop->pid = pid; infop->uid = uid; } |
67d7ddded waitid(2): leave ... |
1131 |
return pid; |
1da177e4c Linux-2.6.12-rc2 |
1132 |
} |
90bc8d8b1 do_wait: fix wait... |
1133 1134 1135 |
static int *task_stopped_code(struct task_struct *p, bool ptrace) { if (ptrace) { |
570ac9337 ptrace: task_stop... |
1136 |
if (task_is_traced(p) && !(p->jobctl & JOBCTL_LISTENING)) |
90bc8d8b1 do_wait: fix wait... |
1137 1138 1139 1140 1141 1142 1143 |
return &p->exit_code; } else { if (p->signal->flags & SIGNAL_STOP_STOPPED) return &p->signal->group_exit_code; } return NULL; } |
19e274630 job control: reor... |
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 |
/** * wait_task_stopped - Wait for %TASK_STOPPED or %TASK_TRACED * @wo: wait options * @ptrace: is the wait for ptrace * @p: task to wait for * * Handle sys_wait4() work for %p in state %TASK_STOPPED or %TASK_TRACED. * * CONTEXT: * read_lock(&tasklist_lock), which is released if return value is * non-zero. Also, grabs and releases @p->sighand->siglock. * * RETURNS: * 0 if wait condition didn't exist and search for other wait conditions * should continue. Non-zero return, -errno on failure and @p's pid on * success, implies that tasklist_lock is released and wait condition * search should terminate. |
1da177e4c Linux-2.6.12-rc2 |
1161 |
*/ |
9e8ae01d1 introduce "struct... |
1162 1163 |
static int wait_task_stopped(struct wait_opts *wo, int ptrace, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1164 |
{ |
67d7ddded waitid(2): leave ... |
1165 1166 |
struct waitid_info *infop; int exit_code, *p_code, why; |
ee7c82da8 wait_task_stopped... |
1167 |
uid_t uid = 0; /* unneeded, required by compiler */ |
c89507835 wait_task_stopped... |
1168 |
pid_t pid; |
1da177e4c Linux-2.6.12-rc2 |
1169 |
|
47918025e shift "ptrace imp... |
1170 1171 1172 |
/* * Traditionally we see ptrace'd stopped tasks regardless of options. */ |
9e8ae01d1 introduce "struct... |
1173 |
if (!ptrace && !(wo->wo_flags & WUNTRACED)) |
98abed020 do_wait reorganiz... |
1174 |
return 0; |
19e274630 job control: reor... |
1175 1176 |
if (!task_stopped_code(p, ptrace)) return 0; |
ee7c82da8 wait_task_stopped... |
1177 1178 |
exit_code = 0; spin_lock_irq(&p->sighand->siglock); |
90bc8d8b1 do_wait: fix wait... |
1179 1180 |
p_code = task_stopped_code(p, ptrace); if (unlikely(!p_code)) |
ee7c82da8 wait_task_stopped... |
1181 |
goto unlock_sig; |
90bc8d8b1 do_wait: fix wait... |
1182 |
exit_code = *p_code; |
ee7c82da8 wait_task_stopped... |
1183 1184 |
if (!exit_code) goto unlock_sig; |
9e8ae01d1 introduce "struct... |
1185 |
if (!unlikely(wo->wo_flags & WNOWAIT)) |
90bc8d8b1 do_wait: fix wait... |
1186 |
*p_code = 0; |
ee7c82da8 wait_task_stopped... |
1187 |
|
8ca937a66 cred: use correct... |
1188 |
uid = from_kuid_munged(current_user_ns(), task_uid(p)); |
ee7c82da8 wait_task_stopped... |
1189 1190 1191 |
unlock_sig: spin_unlock_irq(&p->sighand->siglock); if (!exit_code) |
1da177e4c Linux-2.6.12-rc2 |
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 |
return 0; /* * Now we are pretty sure this task is interesting. * Make sure it doesn't get reaped out from under us while we * give up the lock and then examine it below. We don't want to * keep holding onto the tasklist_lock while we call getrusage and * possibly take page faults for user memory. */ get_task_struct(p); |
6c5f3e7b4 Pidns: make full ... |
1202 |
pid = task_pid_vnr(p); |
f470021ad ptrace children r... |
1203 |
why = ptrace ? CLD_TRAPPED : CLD_STOPPED; |
1da177e4c Linux-2.6.12-rc2 |
1204 |
read_unlock(&tasklist_lock); |
1029a2b52 sched, exit: Deal... |
1205 |
sched_annotate_sleep(); |
e61a25022 lift getrusage() ... |
1206 1207 |
if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); |
bb380ec33 kill wait_noreap_... |
1208 |
put_task_struct(p); |
1da177e4c Linux-2.6.12-rc2 |
1209 |
|
bb380ec33 kill wait_noreap_... |
1210 1211 |
if (likely(!(wo->wo_flags & WNOWAIT))) wo->wo_stat = (exit_code << 8) | 0x7f; |
1da177e4c Linux-2.6.12-rc2 |
1212 |
|
9e8ae01d1 introduce "struct... |
1213 |
infop = wo->wo_info; |
67d7ddded waitid(2): leave ... |
1214 1215 1216 1217 1218 1219 |
if (infop) { infop->cause = why; infop->status = exit_code; infop->pid = pid; infop->uid = uid; } |
67d7ddded waitid(2): leave ... |
1220 |
return pid; |
1da177e4c Linux-2.6.12-rc2 |
1221 1222 1223 1224 1225 1226 1227 1228 |
} /* * Handle do_wait work for one task in a live, non-stopped state. * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */ |
9e8ae01d1 introduce "struct... |
1229 |
static int wait_task_continued(struct wait_opts *wo, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1230 |
{ |
bb380ec33 kill wait_noreap_... |
1231 |
struct waitid_info *infop; |
1da177e4c Linux-2.6.12-rc2 |
1232 1233 |
pid_t pid; uid_t uid; |
9e8ae01d1 introduce "struct... |
1234 |
if (!unlikely(wo->wo_flags & WCONTINUED)) |
98abed020 do_wait reorganiz... |
1235 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 1238 1239 1240 1241 1242 1243 1244 |
if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) return 0; spin_lock_irq(&p->sighand->siglock); /* Re-check with the lock held. */ if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) { spin_unlock_irq(&p->sighand->siglock); return 0; } |
9e8ae01d1 introduce "struct... |
1245 |
if (!unlikely(wo->wo_flags & WNOWAIT)) |
1da177e4c Linux-2.6.12-rc2 |
1246 |
p->signal->flags &= ~SIGNAL_STOP_CONTINUED; |
8ca937a66 cred: use correct... |
1247 |
uid = from_kuid_munged(current_user_ns(), task_uid(p)); |
1da177e4c Linux-2.6.12-rc2 |
1248 |
spin_unlock_irq(&p->sighand->siglock); |
6c5f3e7b4 Pidns: make full ... |
1249 |
pid = task_pid_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1250 1251 |
get_task_struct(p); read_unlock(&tasklist_lock); |
1029a2b52 sched, exit: Deal... |
1252 |
sched_annotate_sleep(); |
e61a25022 lift getrusage() ... |
1253 1254 |
if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); |
bb380ec33 kill wait_noreap_... |
1255 |
put_task_struct(p); |
1da177e4c Linux-2.6.12-rc2 |
1256 |
|
bb380ec33 kill wait_noreap_... |
1257 1258 |
infop = wo->wo_info; if (!infop) { |
359566fae kernel_wait4()/ke... |
1259 |
wo->wo_stat = 0xffff; |
1da177e4c Linux-2.6.12-rc2 |
1260 |
} else { |
bb380ec33 kill wait_noreap_... |
1261 1262 1263 1264 |
infop->cause = CLD_CONTINUED; infop->pid = pid; infop->uid = uid; infop->status = SIGCONT; |
1da177e4c Linux-2.6.12-rc2 |
1265 |
} |
bb380ec33 kill wait_noreap_... |
1266 |
return pid; |
1da177e4c Linux-2.6.12-rc2 |
1267 |
} |
98abed020 do_wait reorganiz... |
1268 1269 1270 |
/* * Consider @p for a wait by @parent. * |
9e8ae01d1 introduce "struct... |
1271 |
* -ECHILD should be in ->notask_error before the first call. |
98abed020 do_wait reorganiz... |
1272 1273 |
* Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; |
9e8ae01d1 introduce "struct... |
1274 |
* then ->notask_error is 0 if @p is an eligible child, |
3a2f5a59a security,selinux,... |
1275 |
* or still -ECHILD. |
98abed020 do_wait reorganiz... |
1276 |
*/ |
b6e763f07 wait_consider_tas... |
1277 1278 |
static int wait_consider_task(struct wait_opts *wo, int ptrace, struct task_struct *p) |
98abed020 do_wait reorganiz... |
1279 |
{ |
3245d6aca exit: fix race be... |
1280 1281 1282 1283 1284 |
/* * We can race with wait_task_zombie() from another thread. * Ensure that EXIT_ZOMBIE -> EXIT_DEAD/EXIT_TRACE transition * can't confuse the checks below. */ |
6aa7de059 locking/atomics: ... |
1285 |
int exit_state = READ_ONCE(p->exit_state); |
b3ab03160 wait: completely ... |
1286 |
int ret; |
3245d6aca exit: fix race be... |
1287 |
if (unlikely(exit_state == EXIT_DEAD)) |
b3ab03160 wait: completely ... |
1288 |
return 0; |
bf959931d wait/ptrace: assu... |
1289 |
ret = eligible_child(wo, ptrace, p); |
14dd0b814 do_wait: return s... |
1290 |
if (!ret) |
98abed020 do_wait reorganiz... |
1291 |
return ret; |
3245d6aca exit: fix race be... |
1292 |
if (unlikely(exit_state == EXIT_TRACE)) { |
50b8d2574 ptrace: partially... |
1293 |
/* |
abd50b39e wait: introduce E... |
1294 1295 |
* ptrace == 0 means we are the natural parent. In this case * we should clear notask_error, debugger will notify us. |
50b8d2574 ptrace: partially... |
1296 |
*/ |
abd50b39e wait: introduce E... |
1297 |
if (likely(!ptrace)) |
50b8d2574 ptrace: partially... |
1298 |
wo->notask_error = 0; |
823b018e5 job control: Smal... |
1299 |
return 0; |
50b8d2574 ptrace: partially... |
1300 |
} |
823b018e5 job control: Smal... |
1301 |
|
377d75daf wait: WSTOPPED|WC... |
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 |
if (likely(!ptrace) && unlikely(p->ptrace)) { /* * If it is traced by its real parent's group, just pretend * the caller is ptrace_do_wait() and reap this child if it * is zombie. * * This also hides group stop state from real parent; otherwise * a single stop can be reported twice as group and ptrace stop. * If a ptracer wants to distinguish these two events for its * own children it should create a separate process which takes * the role of real parent. */ if (!ptrace_reparented(p)) ptrace = 1; } |
45cb24a1d job control: Allo... |
1317 |
/* slay zombie? */ |
3245d6aca exit: fix race be... |
1318 |
if (exit_state == EXIT_ZOMBIE) { |
9b84cca25 job control: Fix ... |
1319 |
/* we don't reap group leaders with subthreads */ |
7c733eb3e wait: WSTOPPED|WC... |
1320 1321 1322 1323 1324 1325 1326 1327 1328 |
if (!delay_group_leader(p)) { /* * A zombie ptracee is only visible to its ptracer. * Notification and reaping will be cascaded to the * real parent when the ptracer detaches. */ if (unlikely(ptrace) || likely(!p->ptrace)) return wait_task_zombie(wo, p); } |
98abed020 do_wait reorganiz... |
1329 |
|
f470021ad ptrace children r... |
1330 |
/* |
9b84cca25 job control: Fix ... |
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 |
* Allow access to stopped/continued state via zombie by * falling through. Clearing of notask_error is complex. * * When !@ptrace: * * If WEXITED is set, notask_error should naturally be * cleared. If not, subset of WSTOPPED|WCONTINUED is set, * so, if there are live subthreads, there are events to * wait for. If all subthreads are dead, it's still safe * to clear - this function will be called again in finite * amount time once all the subthreads are released and * will then return without clearing. * * When @ptrace: * * Stopped state is per-task and thus can't change once the * target task dies. Only continued and exited can happen. * Clear notask_error if WCONTINUED | WEXITED. */ if (likely(!ptrace) || (wo->wo_flags & (WCONTINUED | WEXITED))) wo->notask_error = 0; } else { /* * @p is alive and it's gonna stop, continue or exit, so * there always is something to wait for. |
f470021ad ptrace children r... |
1356 |
*/ |
9e8ae01d1 introduce "struct... |
1357 |
wo->notask_error = 0; |
f470021ad ptrace children r... |
1358 |
} |
98abed020 do_wait reorganiz... |
1359 |
/* |
45cb24a1d job control: Allo... |
1360 1361 |
* Wait for stopped. Depending on @ptrace, different stopped state * is used and the two don't interact with each other. |
98abed020 do_wait reorganiz... |
1362 |
*/ |
19e274630 job control: reor... |
1363 1364 1365 |
ret = wait_task_stopped(wo, ptrace, p); if (ret) return ret; |
98abed020 do_wait reorganiz... |
1366 1367 |
/* |
45cb24a1d job control: Allo... |
1368 1369 1370 |
* Wait for continued. There's only one continued state and the * ptracer can consume it which can confuse the real parent. Don't * use WCONTINUED from ptracer. You don't need or want it. |
98abed020 do_wait reorganiz... |
1371 |
*/ |
9e8ae01d1 introduce "struct... |
1372 |
return wait_task_continued(wo, p); |
98abed020 do_wait reorganiz... |
1373 1374 1375 1376 1377 |
} /* * Do the work of do_wait() for one thread in the group, @tsk. * |
9e8ae01d1 introduce "struct... |
1378 |
* -ECHILD should be in ->notask_error before the first call. |
98abed020 do_wait reorganiz... |
1379 1380 |
* Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; then |
9e8ae01d1 introduce "struct... |
1381 |
* ->notask_error is 0 if there were any eligible children, |
3a2f5a59a security,selinux,... |
1382 |
* or still -ECHILD. |
98abed020 do_wait reorganiz... |
1383 |
*/ |
9e8ae01d1 introduce "struct... |
1384 |
static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk) |
98abed020 do_wait reorganiz... |
1385 1386 1387 1388 |
{ struct task_struct *p; list_for_each_entry(p, &tsk->children, sibling) { |
9cd80bbb0 do_wait() optimiz... |
1389 |
int ret = wait_consider_task(wo, 0, p); |
a0be55dee kernel/exit.c: fi... |
1390 |
|
9cd80bbb0 do_wait() optimiz... |
1391 1392 |
if (ret) return ret; |
98abed020 do_wait reorganiz... |
1393 1394 1395 1396 |
} return 0; } |
9e8ae01d1 introduce "struct... |
1397 |
static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk) |
98abed020 do_wait reorganiz... |
1398 1399 |
{ struct task_struct *p; |
f470021ad ptrace children r... |
1400 |
list_for_each_entry(p, &tsk->ptraced, ptrace_entry) { |
b6e763f07 wait_consider_tas... |
1401 |
int ret = wait_consider_task(wo, 1, p); |
a0be55dee kernel/exit.c: fi... |
1402 |
|
f470021ad ptrace children r... |
1403 |
if (ret) |
98abed020 do_wait reorganiz... |
1404 |
return ret; |
98abed020 do_wait reorganiz... |
1405 1406 1407 1408 |
} return 0; } |
ac6424b98 sched/wait: Renam... |
1409 |
static int child_wait_callback(wait_queue_entry_t *wait, unsigned mode, |
0b7570e77 do_wait() wakeup ... |
1410 1411 1412 1413 1414 |
int sync, void *key) { struct wait_opts *wo = container_of(wait, struct wait_opts, child_wait); struct task_struct *p = key; |
5c01ba49e do_wait-wakeup-op... |
1415 |
if (!eligible_pid(wo, p)) |
0b7570e77 do_wait() wakeup ... |
1416 |
return 0; |
b4fe51823 do_wait() wakeup ... |
1417 1418 |
if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent) return 0; |
0b7570e77 do_wait() wakeup ... |
1419 1420 |
return default_wake_function(wait, mode, sync, key); } |
a7f0765ed ptrace: __ptrace_... |
1421 1422 |
void __wake_up_parent(struct task_struct *p, struct task_struct *parent) { |
0b7570e77 do_wait() wakeup ... |
1423 1424 |
__wake_up_sync_key(&parent->signal->wait_chldexit, TASK_INTERRUPTIBLE, 1, p); |
a7f0765ed ptrace: __ptrace_... |
1425 |
} |
9e8ae01d1 introduce "struct... |
1426 |
static long do_wait(struct wait_opts *wo) |
1da177e4c Linux-2.6.12-rc2 |
1427 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1428 |
struct task_struct *tsk; |
98abed020 do_wait reorganiz... |
1429 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1430 |
|
9e8ae01d1 introduce "struct... |
1431 |
trace_sched_process_wait(wo->wo_pid); |
0a16b6075 tracing, sched: L... |
1432 |
|
0b7570e77 do_wait() wakeup ... |
1433 1434 1435 |
init_waitqueue_func_entry(&wo->child_wait, child_wait_callback); wo->child_wait.private = current; add_wait_queue(¤t->signal->wait_chldexit, &wo->child_wait); |
1da177e4c Linux-2.6.12-rc2 |
1436 |
repeat: |
98abed020 do_wait reorganiz... |
1437 |
/* |
3da56d166 kernel: exit: fix... |
1438 |
* If there is nothing that can match our criteria, just get out. |
9e8ae01d1 introduce "struct... |
1439 1440 1441 |
* We will clear ->notask_error to zero if we see any child that * might later match our criteria, even if we are not able to reap * it yet. |
98abed020 do_wait reorganiz... |
1442 |
*/ |
64a16caf5 do_wait: simplify... |
1443 |
wo->notask_error = -ECHILD; |
9e8ae01d1 introduce "struct... |
1444 1445 |
if ((wo->wo_type < PIDTYPE_MAX) && (!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type]))) |
64a16caf5 do_wait: simplify... |
1446 |
goto notask; |
161550d74 pid: sys_wait... ... |
1447 |
|
f95d39d10 do_wait: fix the ... |
1448 |
set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1449 1450 1451 |
read_lock(&tasklist_lock); tsk = current; do { |
64a16caf5 do_wait: simplify... |
1452 1453 1454 |
retval = do_wait_thread(wo, tsk); if (retval) goto end; |
9e8ae01d1 introduce "struct... |
1455 |
|
64a16caf5 do_wait: simplify... |
1456 1457 |
retval = ptrace_do_wait(wo, tsk); if (retval) |
98abed020 do_wait reorganiz... |
1458 |
goto end; |
98abed020 do_wait reorganiz... |
1459 |
|
9e8ae01d1 introduce "struct... |
1460 |
if (wo->wo_flags & __WNOTHREAD) |
1da177e4c Linux-2.6.12-rc2 |
1461 |
break; |
a3f6dfb72 do_wait: kill the... |
1462 |
} while_each_thread(current, tsk); |
1da177e4c Linux-2.6.12-rc2 |
1463 |
read_unlock(&tasklist_lock); |
f2cc3eb13 do_wait: fix secu... |
1464 |
|
64a16caf5 do_wait: simplify... |
1465 |
notask: |
9e8ae01d1 introduce "struct... |
1466 1467 |
retval = wo->notask_error; if (!retval && !(wo->wo_flags & WNOHANG)) { |
1da177e4c Linux-2.6.12-rc2 |
1468 |
retval = -ERESTARTSYS; |
98abed020 do_wait reorganiz... |
1469 1470 1471 1472 |
if (!signal_pending(current)) { schedule(); goto repeat; } |
1da177e4c Linux-2.6.12-rc2 |
1473 |
} |
1da177e4c Linux-2.6.12-rc2 |
1474 |
end: |
f95d39d10 do_wait: fix the ... |
1475 |
__set_current_state(TASK_RUNNING); |
0b7570e77 do_wait() wakeup ... |
1476 |
remove_wait_queue(¤t->signal->wait_chldexit, &wo->child_wait); |
1da177e4c Linux-2.6.12-rc2 |
1477 1478 |
return retval; } |
67d7ddded waitid(2): leave ... |
1479 |
static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop, |
ce72a16fa wait4(2)/waitid(2... |
1480 |
int options, struct rusage *ru) |
1da177e4c Linux-2.6.12-rc2 |
1481 |
{ |
9e8ae01d1 introduce "struct... |
1482 |
struct wait_opts wo; |
161550d74 pid: sys_wait... ... |
1483 1484 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1485 |
long ret; |
91c4e8ea8 wait: allow sys_w... |
1486 1487 |
if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) |
1da177e4c Linux-2.6.12-rc2 |
1488 1489 1490 1491 1492 1493 |
return -EINVAL; if (!(options & (WEXITED|WSTOPPED|WCONTINUED))) return -EINVAL; switch (which) { case P_ALL: |
161550d74 pid: sys_wait... ... |
1494 |
type = PIDTYPE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
1495 1496 |
break; case P_PID: |
161550d74 pid: sys_wait... ... |
1497 1498 |
type = PIDTYPE_PID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1499 1500 1501 |
return -EINVAL; break; case P_PGID: |
161550d74 pid: sys_wait... ... |
1502 1503 |
type = PIDTYPE_PGID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1504 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1505 1506 1507 1508 |
break; default: return -EINVAL; } |
161550d74 pid: sys_wait... ... |
1509 1510 |
if (type < PIDTYPE_MAX) pid = find_get_pid(upid); |
9e8ae01d1 introduce "struct... |
1511 1512 1513 1514 1515 |
wo.wo_type = type; wo.wo_pid = pid; wo.wo_flags = options; wo.wo_info = infop; |
9e8ae01d1 introduce "struct... |
1516 1517 |
wo.wo_rusage = ru; ret = do_wait(&wo); |
dfe16dfa4 do_wait: fix sys_... |
1518 |
|
161550d74 pid: sys_wait... ... |
1519 |
put_pid(pid); |
1da177e4c Linux-2.6.12-rc2 |
1520 1521 |
return ret; } |
ce72a16fa wait4(2)/waitid(2... |
1522 1523 1524 1525 |
SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, infop, int, options, struct rusage __user *, ru) { struct rusage r; |
67d7ddded waitid(2): leave ... |
1526 1527 |
struct waitid_info info = {.status = 0}; long err = kernel_waitid(which, upid, &info, options, ru ? &r : NULL); |
634a81609 fix waitid(2) bre... |
1528 |
int signo = 0; |
6c85501f2 fix infoleak in w... |
1529 |
|
634a81609 fix waitid(2) bre... |
1530 1531 1532 |
if (err > 0) { signo = SIGCHLD; err = 0; |
ce72a16fa wait4(2)/waitid(2... |
1533 1534 1535 |
if (ru && copy_to_user(ru, &r, sizeof(struct rusage))) return -EFAULT; } |
67d7ddded waitid(2): leave ... |
1536 1537 |
if (!infop) return err; |
96ca579a1 waitid(): Add mis... |
1538 |
if (!access_ok(VERIFY_WRITE, infop, sizeof(*infop))) |
1c9fec470 waitid(): Avoid u... |
1539 |
return -EFAULT; |
96ca579a1 waitid(): Add mis... |
1540 |
|
4c48abe91 waitid(): switch ... |
1541 |
user_access_begin(); |
634a81609 fix waitid(2) bre... |
1542 |
unsafe_put_user(signo, &infop->si_signo, Efault); |
4c48abe91 waitid(): switch ... |
1543 |
unsafe_put_user(0, &infop->si_errno, Efault); |
cc731525f signal: Remove ke... |
1544 |
unsafe_put_user(info.cause, &infop->si_code, Efault); |
4c48abe91 waitid(): switch ... |
1545 1546 1547 1548 |
unsafe_put_user(info.pid, &infop->si_pid, Efault); unsafe_put_user(info.uid, &infop->si_uid, Efault); unsafe_put_user(info.status, &infop->si_status, Efault); user_access_end(); |
ce72a16fa wait4(2)/waitid(2... |
1549 |
return err; |
4c48abe91 waitid(): switch ... |
1550 1551 1552 |
Efault: user_access_end(); return -EFAULT; |
ce72a16fa wait4(2)/waitid(2... |
1553 |
} |
92ebce5ac osf_wait4: switch... |
1554 1555 |
long kernel_wait4(pid_t upid, int __user *stat_addr, int options, struct rusage *ru) |
1da177e4c Linux-2.6.12-rc2 |
1556 |
{ |
9e8ae01d1 introduce "struct... |
1557 |
struct wait_opts wo; |
161550d74 pid: sys_wait... ... |
1558 1559 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1560 1561 1562 1563 1564 |
long ret; if (options & ~(WNOHANG|WUNTRACED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) return -EINVAL; |
161550d74 pid: sys_wait... ... |
1565 |
|
dd83c161f kernel/exit.c: av... |
1566 1567 1568 |
/* -INT_MIN is not defined */ if (upid == INT_MIN) return -ESRCH; |
161550d74 pid: sys_wait... ... |
1569 1570 1571 1572 1573 1574 1575 |
if (upid == -1) type = PIDTYPE_MAX; else if (upid < 0) { type = PIDTYPE_PGID; pid = find_get_pid(-upid); } else if (upid == 0) { type = PIDTYPE_PGID; |
2ae448efc pids: improve get... |
1576 |
pid = get_task_pid(current, PIDTYPE_PGID); |
161550d74 pid: sys_wait... ... |
1577 1578 1579 1580 |
} else /* upid > 0 */ { type = PIDTYPE_PID; pid = find_get_pid(upid); } |
9e8ae01d1 introduce "struct... |
1581 1582 1583 1584 |
wo.wo_type = type; wo.wo_pid = pid; wo.wo_flags = options | WEXITED; wo.wo_info = NULL; |
359566fae kernel_wait4()/ke... |
1585 |
wo.wo_stat = 0; |
9e8ae01d1 introduce "struct... |
1586 1587 |
wo.wo_rusage = ru; ret = do_wait(&wo); |
161550d74 pid: sys_wait... ... |
1588 |
put_pid(pid); |
359566fae kernel_wait4()/ke... |
1589 1590 |
if (ret > 0 && stat_addr && put_user(wo.wo_stat, stat_addr)) ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1591 |
|
1da177e4c Linux-2.6.12-rc2 |
1592 1593 |
return ret; } |
ce72a16fa wait4(2)/waitid(2... |
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 |
SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr, int, options, struct rusage __user *, ru) { struct rusage r; long err = kernel_wait4(upid, stat_addr, options, ru ? &r : NULL); if (err > 0) { if (ru && copy_to_user(ru, &r, sizeof(struct rusage))) return -EFAULT; } return err; } |
1da177e4c Linux-2.6.12-rc2 |
1606 1607 1608 1609 1610 1611 |
#ifdef __ARCH_WANT_SYS_WAITPID /* * sys_waitpid() remains for compatibility. waitpid() should be * implemented by calling sys_wait4() from libc.a. */ |
17da2bd90 [CVE-2009-0029] S... |
1612 |
SYSCALL_DEFINE3(waitpid, pid_t, pid, int __user *, stat_addr, int, options) |
1da177e4c Linux-2.6.12-rc2 |
1613 1614 1615 1616 1617 |
{ return sys_wait4(pid, stat_addr, options, NULL); } #endif |
7e95a2259 move compat wait4... |
1618 1619 1620 1621 1622 1623 1624 1625 |
#ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE4(wait4, compat_pid_t, pid, compat_uint_t __user *, stat_addr, int, options, struct compat_rusage __user *, ru) { |
ce72a16fa wait4(2)/waitid(2... |
1626 1627 1628 1629 1630 |
struct rusage r; long err = kernel_wait4(pid, stat_addr, options, ru ? &r : NULL); if (err > 0) { if (ru && put_compat_rusage(&r, ru)) return -EFAULT; |
7e95a2259 move compat wait4... |
1631 |
} |
ce72a16fa wait4(2)/waitid(2... |
1632 |
return err; |
7e95a2259 move compat wait4... |
1633 1634 1635 1636 1637 1638 1639 |
} COMPAT_SYSCALL_DEFINE5(waitid, int, which, compat_pid_t, pid, struct compat_siginfo __user *, infop, int, options, struct compat_rusage __user *, uru) { |
7e95a2259 move compat wait4... |
1640 |
struct rusage ru; |
67d7ddded waitid(2): leave ... |
1641 1642 |
struct waitid_info info = {.status = 0}; long err = kernel_waitid(which, pid, &info, options, uru ? &ru : NULL); |
634a81609 fix waitid(2) bre... |
1643 1644 1645 1646 |
int signo = 0; if (err > 0) { signo = SIGCHLD; err = 0; |
6c85501f2 fix infoleak in w... |
1647 1648 1649 1650 1651 1652 1653 1654 1655 |
if (uru) { /* kernel_waitid() overwrites everything in ru */ if (COMPAT_USE_64BIT_TIME) err = copy_to_user(uru, &ru, sizeof(ru)); else err = put_compat_rusage(&ru, uru); if (err) return -EFAULT; } |
7e95a2259 move compat wait4... |
1656 |
} |
4c48abe91 waitid(): switch ... |
1657 1658 |
if (!infop) return err; |
96ca579a1 waitid(): Add mis... |
1659 |
if (!access_ok(VERIFY_WRITE, infop, sizeof(*infop))) |
1c9fec470 waitid(): Avoid u... |
1660 |
return -EFAULT; |
96ca579a1 waitid(): Add mis... |
1661 |
|
4c48abe91 waitid(): switch ... |
1662 |
user_access_begin(); |
634a81609 fix waitid(2) bre... |
1663 |
unsafe_put_user(signo, &infop->si_signo, Efault); |
4c48abe91 waitid(): switch ... |
1664 |
unsafe_put_user(0, &infop->si_errno, Efault); |
cc731525f signal: Remove ke... |
1665 |
unsafe_put_user(info.cause, &infop->si_code, Efault); |
4c48abe91 waitid(): switch ... |
1666 1667 1668 1669 |
unsafe_put_user(info.pid, &infop->si_pid, Efault); unsafe_put_user(info.uid, &infop->si_uid, Efault); unsafe_put_user(info.status, &infop->si_status, Efault); user_access_end(); |
67d7ddded waitid(2): leave ... |
1670 |
return err; |
4c48abe91 waitid(): switch ... |
1671 1672 1673 |
Efault: user_access_end(); return -EFAULT; |
7e95a2259 move compat wait4... |
1674 1675 |
} #endif |
7c2c11b20 arch: define weak... |
1676 1677 1678 1679 1680 1681 1682 1683 |
__weak void abort(void) { BUG(); /* if that doesn't kill us, halt */ panic("Oops failed to kill thread"); } |