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reparent_thread: fix the "is it traced" check

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reparent_thread() uses ptrace_reparented() to check whether this thread is
ptraced, in that case we should not notify the new parent.

But ptrace_reparented() is not exactly correct when the reparented thread
is traced by /sbin/init, because forget_original_parent() has already
changed ->real_parent.

Currently, the only problem is the false notification.  But with the next
patch the kernel crash in this (yes, pathological) case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2009-04-02 16:58:16 -07:00 committed by Linus Torvalds
parent 0a967a044a
commit b1442b055c
1 changed files with 1 additions and 1 deletions
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2
kernel/exit.c
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@ -832,7 +832,7 @@ static void reparent_thread(struct task_struct *p, struct task_struct *father)
/* If we'd notified the old parent about this child's death,
* also notify the new parent.
*/
if (!ptrace_reparented(p) &&
if (!p->ptrace &&
p->exit_state == EXIT_ZOMBIE && thread_group_empty(p))
do_notify_parent(p, p->exit_signal);