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authorOleg Nesterov <oleg@tv-sign.ru>2006-03-28 16:11:16 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-28 18:36:42 -0800
commit6b3934ef52712ece50605dfc72e55d00c580831a (patch)
tree5ec3c4f69a20880f75de6ff8d7d2f67d96328df3 /kernel/signal.c
parent7001510d0cbf51ad202dd2d0744f54104285cbb9 (diff)
downloadblackbird-op-linux-6b3934ef52712ece50605dfc72e55d00c580831a.tar.gz
blackbird-op-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.c15
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.
*/
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