From b07e35f94a7b6a059f889b904529ee907dc0634d Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 30 Aug 2007 23:56:27 -0700 Subject: [PATCH] setpgid(child) fails if the child was forked by sub-thread Spotted by Marcin Kowalczyk . 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 Acked-by: Roland McGrath Cc: Tested-by: "Marcin 'Qrczak' Kowalczyk" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/sys.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/sys.c b/kernel/sys.c index 449b81b98b3d..1b33b05d346b 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1442,7 +1442,6 @@ asmlinkage long sys_times(struct tms __user * tbuf) * 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; @@ -1470,7 +1469,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) 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; -- 2.20.1