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signal: zap_pid_ns_processes: s/SEND_SIG_NOINFO/SEND_SIG_FORCED/
Change zap_pid_ns_processes() to use SEND_SIG_FORCED, it looks more clear compared to SEND_SIG_NOINFO which relies on from_ancestor_ns logic send_signal(). It is also more efficient if we need to kill a lot of tasks because it doesn't alloc sigqueue. While at it, add the __fatal_signal_pending(task) check as a minor optimization. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Anton Vorontsov <anton.vorontsov@linaro.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -168,13 +168,9 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
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while (nr > 0) {
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rcu_read_lock();
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/*
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* Any nested-container's init processes won't ignore the
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* SEND_SIG_NOINFO signal, see send_signal()->si_fromuser().
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*/
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task = pid_task(find_vpid(nr), PIDTYPE_PID);
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if (task)
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send_sig_info(SIGKILL, SEND_SIG_NOINFO, task);
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if (task && !__fatal_signal_pending(task))
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send_sig_info(SIGKILL, SEND_SIG_FORCED, task);
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rcu_read_unlock();
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