Re: [patch 6/9] signal: Fix racy access to __task_cred in kill_pid_info_as_uid()

David Howells
2009-12-11T13:54:47Z

Thomas Gleixner <tglx@linutronix.de> wrote:

> kill_pid_info_as_uid() accesses __task_cred() without being in a RCU
> read side critical section. tasklist_lock is not protecting that when
> CONFIG_TREE_PREEMPT_RCU=y.
>
> Convert the whole tasklist_lock section to rcu and use
> lock_task_sighand to prevent the exit race.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Acked-by: David Howells <dhowells@redhat.com>