Spotted by Marcin Kowalczyk <[EMAIL PROTECTED]>.
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 <[EMAIL PROTECTED]>
--- t/kernel/sys.c~SETPGID 2007-08-09 19:59:27.000000000 +0400
+++ t/kernel/sys.c 2007-08-22 20:11:23.000000000 +0400
@@ -1442,7 +1442,6 @@ 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;
@@ -1470,7 +1469,7 @@ 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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