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Subject[05/50] setpgid(child) fails if the child was forked by sub-thread

From: Oleg Nesterov <oleg@tv-sign.ru>

commit b07e35f94a7b6a059f889b904529ee907dc0634d in mainline tree

Spotted by Marcin Kowalczyk <qrczak@knm.org.pl>.

sys_setpgid(child) fails if the child was forked by sub-thread.

Fix the "is it our child" check. The previous commit
ee0acf90d320c29916ba8c5c1b2e908d81f5057d was not complete.

(this patch asks for the new same_thread_group() helper, but mainline doesn't
have it yet).

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Tested-by: "Marcin 'Qrczak' Kowalczyk" <qrczak@knm.org.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


---
kernel/sys.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1428,7 +1428,6 @@ asmlinkage long sys_times(struct tms __u
* Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
* LBT 04.03.94
*/
-
asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
{
struct task_struct *p;
@@ -1456,7 +1455,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
if (!thread_group_leader(p))
goto out;

- if (p->real_parent == group_leader) {
+ if (p->real_parent->tgid == group_leader->tgid) {
err = -EPERM;
if (task_session(p) != task_session(group_leader))
goto out;
--
-
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