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sysrq: Fix possible race with exiting task
sysrq should grab the tasklist lock, otherwise calling force_sig() is not safe, as it might race with exiting task, which ->sighand might be set to NULL already. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -322,11 +322,13 @@ static void send_sig_all(int sig)
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{
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struct task_struct *p;
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read_lock(&tasklist_lock);
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for_each_process(p) {
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if (p->mm && !is_global_init(p))
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/* Not swapper, init nor kernel thread */
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force_sig(sig, p);
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}
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read_unlock(&tasklist_lock);
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}
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static void sysrq_handle_term(int key)
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