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authorEric W. Biederman <ebiederm@xmission.com>2018-07-19 19:47:27 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-09-11 21:18:15 +0200
commit86989c41b5ea08776c450cb759592532314a4ed6 (patch)
treea98b4d6f24db7094b39d9f19d4d67b2446bcf483 /kernel/signal.c
parent5b394b2ddf0347bef56e50c69a58773c94343ff3 (diff)
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signal: Always ignore SIGKILL and SIGSTOP sent to the global init
If the first process started (aka /sbin/init) receives a SIGKILL it will panic the system if it is delivered. Making the system unusable and undebugable. It isn't much better if the first process started receives SIGSTOP. So always ignore SIGSTOP and SIGKILL sent to init. This is done in a separate clause in sig_task_ignored as force_sig_info can clear SIG_UNKILLABLE and this protection should work even then. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 5843c541fda9..b33264bb2064 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -78,6 +78,10 @@ static bool sig_task_ignored(struct task_struct *t, int sig, bool force)
handler = sig_handler(t, sig);
+ /* SIGKILL and SIGSTOP may not be sent to the global init */
+ if (unlikely(is_global_init(t) && sig_kernel_only(sig)))
+ return true;
+
if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
handler == SIG_DFL && !(force && sig_kernel_only(sig)))
return true;