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| author | Kirill Korotaev <dev@sw.ru> | 2006-09-29 02:00:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 09:18:12 -0700 |
| commit | 3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6 (patch) | |
| tree | 104c7b01768acd7e152cbf66e4868a73804e8af9 /kernel/exit.c | |
| parent | fc09561d6392771a392dea55c287de7e849b6b63 (diff) | |
| download | lwn-3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6.tar.gz lwn-3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6.zip | |
[PATCH] Fix unserialized task->files changing
Fixed race on put_files_struct on exec with proc. Restoring files on
current on error path may lead to proc having a pointer to already kfree-d
files_struct.
->files changing at exit.c and khtread.c are safe as exit_files() makes all
things under lock.
Found during OpenVZ stress testing.
[akpm@osdl.org: add export]
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index d891883420f7..4b6fb054b25d 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -487,6 +487,18 @@ void fastcall put_files_struct(struct files_struct *files) EXPORT_SYMBOL(put_files_struct); +void reset_files_struct(struct task_struct *tsk, struct files_struct *files) +{ + struct files_struct *old; + + old = tsk->files; + task_lock(tsk); + tsk->files = files; + task_unlock(tsk); + put_files_struct(old); +} +EXPORT_SYMBOL(reset_files_struct); + static inline void __exit_files(struct task_struct *tsk) { struct files_struct * files = tsk->files; |