setpgid(child) fails if the child was forked by sub-thread
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
ee0acf90d3
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>
Cc: <stable@kernel.org>
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>
This commit is contained in:
parent
5d540fb715
commit
b07e35f94a
@ -1442,7 +1442,6 @@ asmlinkage long sys_times(struct tms __user * tbuf)
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* Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
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* LBT 04.03.94
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*/
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asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
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{
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struct task_struct *p;
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@ -1470,7 +1469,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
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if (!thread_group_leader(p))
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goto out;
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if (p->real_parent == group_leader) {
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if (p->real_parent->tgid == group_leader->tgid) {
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err = -EPERM;
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if (task_session(p) != task_session(group_leader))
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goto out;
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