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

[David Howells]

Thomas Gleixner <tglx@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>

Acked-by: David Howells <dhowells@xxxxxxxxxx>
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