From 82058d6684658430cd9b4123d4c3e863fd48f813 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Fri, 20 Jul 2018 16:35:14 -0500
Subject: [PATCH] signal: Use group_send_sig_info to kill all processes in a
pid namespace
Replace send_sig_info in zap_pid_ns_processes with
group_send_sig_info. This makes more sense as the entire process
group is being killed. More importantly this allows the kill of those
processes with PIDTYPE_MAX to indicate all of the process in the pid
namespace are being signaled. This is needed for fork to detect when
signals are sent to a group of processes.
Admittedly fork has another case to catch SIGKILL but the principle remains
that it is desirable to know when a group of processes is being signaled.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
kernel/pid_namespace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index c8d53397bbdd..aa6e72fb7c08 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -216,7 +216,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
idr_for_each_entry_continue(&pid_ns->idr, pid, nr) {
task = pid_task(pid, PIDTYPE_PID);
if (task && !__fatal_signal_pending(task))
- send_sig_info(SIGKILL, SEND_SIG_PRIV, task);
+ group_send_sig_info(SIGKILL, SEND_SIG_PRIV, task, PIDTYPE_MAX);
}
read_unlock(&tasklist_lock);
rcu_read_unlock();