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Commit 0fbc26a6 authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Linus Torvalds
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pid namespaces: allow signalling cgroup-init 



Only the global-init process must be special - any other cgroup-init
process must be killable to prevent run-away processes in the system.

TODO: 	Ideally we should allow killing the cgroup-init only from parent
	cgroup and prevent it being killed from within the cgroup.
	But that is a more complex change and will be addressed by a follow-on
	patch. For now allow the cgroup-init to be terminated by any process
	with sufficient privileges.

Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@us.ibm.com>
Acked-by: default avatarPavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c9c5d922

kernel/signal.c

+2 −4
Original line number Original line Diff line number Diff line
@@ -1835,11 +1835,9 @@ int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, 
			continue;

			continue;





		/*

		/*

		 * Init of a pid space gets no signals it doesn't want from

		 * Global init gets no signals it doesn't want.

		 * within that pid space. It can of course get signals from

		 * its parent pid space.

		 */

		 */

		if (current == task_child_reaper(current))

		if (is_global_init(current))

			continue;

			continue;





		if (sig_kernel_stop(signr)) {

		if (sig_kernel_stop(signr)) {