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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-03-28 16:11:16 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-28 18:36:42 -0800 |
| commit | 6b3934ef52712ece50605dfc72e55d00c580831a (patch) | |
| tree | 5ec3c4f69a20880f75de6ff8d7d2f67d96328df3 /kernel/signal.c | |
| parent | 7001510d0cbf51ad202dd2d0744f54104285cbb9 (diff) | |
| download | linux-6b3934ef52712ece50605dfc72e55d00c580831a.tar.gz linux-6b3934ef52712ece50605dfc72e55d00c580831a.tar.bz2 linux-6b3934ef52712ece50605dfc72e55d00c580831a.zip | |
[PATCH] copy_process: cleanup bad_fork_cleanup_signal
__exit_signal() does important cleanups atomically under ->siglock. It is
also called from copy_process's error path. This is not good, for example we
can't move __unhash_process() under ->siglock for that reason.
We should not mix these 2 paths, just look at ugly 'if (p->sighand)' under
'bad_fork_cleanup_sighand:' label. For copy_process() case it is sufficient
to just backout copy_signal(), nothing more.
Again, nobody can see this task yet. For CLONE_THREAD case we just decrement
signal->count, otherwise nobody can see this ->signal and we can free it
lockless.
This patch assumes it is safe to do exit_thread_group_keys() without
tasklist_lock.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 15 |
1 files changed, 1 insertions, 14 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 1d7f4463c32d..54e9ef673e68 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -395,23 +395,10 @@ void __exit_signal(struct task_struct *tsk) clear_tsk_thread_flag(tsk,TIF_SIGPENDING); flush_sigqueue(&tsk->pending); if (sig) { - /* - * We are cleaning up the signal_struct here. - */ - exit_thread_group_keys(sig); - kmem_cache_free(signal_cachep, sig); + __cleanup_signal(sig); } } -void exit_signal(struct task_struct *tsk) -{ - atomic_dec(&tsk->signal->live); - - write_lock_irq(&tasklist_lock); - __exit_signal(tsk); - write_unlock_irq(&tasklist_lock); -} - /* * Flush all handlers for a task. */ |