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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-08-30 23:56:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-31 01:42:22 -0700 |
| commit | b07e35f94a7b6a059f889b904529ee907dc0634d (patch) | |
| tree | 0d6178552b4232fa4ea7c3d49aa4710873babc11 /kernel/sys.c | |
| parent | 5d540fb71552b9f2c542bea967200c48be2d8ef6 (diff) | |
| download | linux-b07e35f94a7b6a059f889b904529ee907dc0634d.tar.gz linux-b07e35f94a7b6a059f889b904529ee907dc0634d.tar.bz2 linux-b07e35f94a7b6a059f889b904529ee907dc0634d.zip | |
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
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>
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>
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 3 |
1 files changed, 1 insertions, 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; |