diff options
| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2008-05-12 23:02:31 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-13 17:02:25 +0200 |
| commit | 4cd1a8fc3d3cd740416b14ece2693dbb5d065eaf (patch) | |
| tree | 2acebe40e15b91a3df78ea5b677a84c509a30ae0 /fs/exec.c | |
| parent | spi_mpc83xx: much improved driver (diff) | |
| download | linux-4cd1a8fc3d3cd740416b14ece2693dbb5d065eaf.tar.xz linux-4cd1a8fc3d3cd740416b14ece2693dbb5d065eaf.zip | |
memcg: fix possible panic when CONFIG_MM_OWNER=y
When mm destruction happens, we should pass mm_update_next_owner() the old mm.
But unfortunately new mm is passed in exec_mmap().
Thus, kernel panic is possible when a multi-threaded process uses exec().
Also, the owner member comment description is wrong. mm->owner does not
necessarily point to the thread group leader.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: "Paul Menage" <menage@google.com>
Cc: "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c index aeaa9791d8be..1f8a24aa1f8b 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -736,7 +736,7 @@ static int exec_mmap(struct mm_struct *mm) tsk->active_mm = mm; activate_mm(active_mm, mm); task_unlock(tsk); - mm_update_next_owner(mm); + mm_update_next_owner(old_mm); arch_pick_mmap_layout(mm); if (old_mm) { up_read(&old_mm->mmap_sem); |