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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-08-27 01:23:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-08-27 11:01:29 -0700 |
| commit | f8986c241dfd54d51c9eff967129a550ae230144 (patch) | |
| tree | 62f9a9739a2119024ad7bef7c26498bd332904b5 /kernel | |
| parent | cb3e0fe3a5dabdc5eda50b825acb23bdfa2d1d55 (diff) | |
| download | lwn-f8986c241dfd54d51c9eff967129a550ae230144.tar.gz lwn-f8986c241dfd54d51c9eff967129a550ae230144.zip | |
[PATCH] revert "Drop tasklist lock in do_sched_setscheduler"
sched_setscheduler() looks at ->signal->rlim[]. It is unsafe do
dereference ->signal unless tasklist_lock or ->siglock is held (or p ==
current). We pin the task structure, but this can't prevent from
release_task()->__exit_signal() which sets ->signal = NULL.
Restore tasklist_lock across the setscheduler call.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index a2be2d055299..a234fbee1238 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4162,10 +4162,8 @@ do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param) read_unlock_irq(&tasklist_lock); return -ESRCH; } - get_task_struct(p); - read_unlock_irq(&tasklist_lock); retval = sched_setscheduler(p, policy, &lparam); - put_task_struct(p); + read_unlock_irq(&tasklist_lock); return retval; } |