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pid namespaces: allow signalling cgroup-init

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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: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Acked-by: Pavel 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sukadev Bhattiprolu 2007-10-18 23:40:13 -07:00 committed by Linus Torvalds
parent c9c5d92211
commit 0fbc26a6cf
1 changed files with 2 additions and 4 deletions
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6
kernel/signal.c
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@ -1835,11 +1835,9 @@ relock:
continue;
/*
* Init of a pid space gets no signals it doesn't want from
* within that pid space. It can of course get signals from
* its parent pid space.
* Global init gets no signals it doesn't want.
*/
if (current == task_child_reaper(current))
if (is_global_init(current))
continue;
if (sig_kernel_stop(signr)) {