signal: Fix racy access to __task_cred in kill_pid_info_as_uid()

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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>
LKML-Reference: <20091210004703.232302055@linutronix.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>

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Thomas Gleixner 2009-12-10 00:53:17 +00:00

parent ea5b41f9d5

commit 14d8c9f3c0

1 changed files with 10 additions and 7 deletions

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kernel/signal.c

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