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Subject[ 024/184] wake_up_process() should be never used to wakeup a
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
TASK_STOPPED/TRACED task

From: Oleg Nesterov <oleg@redhat.com>

wake_up_process() should be never used to wakeup a TASK_STOPPED/TRACED task

CVE-2013-0871

BugLink: http://bugs.launchpad.net/bugs/1129192

wake_up_process() should never wakeup a TASK_STOPPED/TRACED task.
Change it to use TASK_NORMAL and add the WARN_ON().

TASK_ALL has no other users, probably can be killed.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(backported from commit 9067ac85d533651b98c2ff903182a20cbb361fcb)

Conflicts:
kernel/sched/core.c

Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Acked-by: Colin King <colin.king@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
kernel/sched.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 0591df8..42bf6a6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2618,7 +2618,8 @@ out:
*/
int wake_up_process(struct task_struct *p)
{
- return try_to_wake_up(p, TASK_ALL, 0);
+ WARN_ON(task_is_stopped_or_traced(p));
+ return try_to_wake_up(p, TASK_NORMAL, 0);
}
EXPORT_SYMBOL(wake_up_process);

--
1.7.12.2.21.g234cd45.dirty




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