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authorOleg Nesterov <oleg@redhat.com>2010-03-05 13:44:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 11:26:46 -0800
commit5c99cbf49a6e1a1efd25b11f4604c65c455e1612 (patch)
treee2a3451cc87f83b15f23a0472339be81770e12da /fs
parent30736a4d43f4af7f1a7836d6a266be17082195c4 (diff)
downloadop-kernel-dev-5c99cbf49a6e1a1efd25b11f4604c65c455e1612.zip
op-kernel-dev-5c99cbf49a6e1a1efd25b11f4604c65c455e1612.tar.gz
coredump: set ->group_exit_code for other CLONE_VM tasks too
User visible change. do_coredump() kills all threads which share the same ->mm but only the coredumping process gets the proper exit_code. Other tasks which share the same ->mm die "silently" and return status == 0 to parent. This is historical behaviour, not actually a bug. But I think Frank Heckenbach rightly dislikes the current behaviour. Simple test-case: #include <stdio.h> #include <unistd.h> #include <signal.h> #include <sys/wait.h> int main(void) { int stat; if (!fork()) { if (!vfork()) kill(getpid(), SIGQUIT); } wait(&stat); printf("stat=%x\n", stat); return 0; } Before this patch it prints "stat=0" despite the fact the child was killed by SIGQUIT. After this patch the output is "stat=3" which obviously makes more sense. Even with this patch, only the task which originates the coredumping gets "|= 0x80" if the core was actually dumped, but at least the coredumping signal is visible to do_wait/etc. Reported-by: Frank Heckenbach <f.heckenbach@fh-soft.de> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Cc: Roland McGrath <roland@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 89d4080..829a6c6 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1561,12 +1561,13 @@ out:
return ispipe;
}
-static int zap_process(struct task_struct *start)
+static int zap_process(struct task_struct *start, int exit_code)
{
struct task_struct *t;
int nr = 0;
start->signal->flags = SIGNAL_GROUP_EXIT;
+ start->signal->group_exit_code = exit_code;
start->signal->group_stop_count = 0;
t = start;
@@ -1591,8 +1592,7 @@ static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
spin_lock_irq(&tsk->sighand->siglock);
if (!signal_group_exit(tsk->signal)) {
mm->core_state = core_state;
- tsk->signal->group_exit_code = exit_code;
- nr = zap_process(tsk);
+ nr = zap_process(tsk, exit_code);
}
spin_unlock_irq(&tsk->sighand->siglock);
if (unlikely(nr < 0))
@@ -1641,7 +1641,7 @@ static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
if (p->mm) {
if (unlikely(p->mm == mm)) {
lock_task_sighand(p, &flags);
- nr += zap_process(p);
+ nr += zap_process(p, exit_code);
unlock_task_sighand(p, &flags);
}
break;
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