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[PATCH] Fix unserialized task->files changing

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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>
This commit is contained in:
Kirill Korotaev 2006-09-29 02:00:05 -07:00 • committed by Linus Torvalds
parent fc09561d63
commit 3b9b8ab65d
5 changed files with 18 additions and 10 deletions
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12
kernel/exit.c
View file

@ -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;