pid_ns: zap_pid_ns_processes: use SEND_SIG_NOINFO instead of force_sig()

zap_pid_ns_processes() uses force_sig(SIGKILL) to ensure SIGKILL will be
delivered to sub-namespace inits as well.  This is correct, but we are
going to change force_sig_info() semantics.  See
http://bugzilla.kernel.org/show_bug.cgi?id=15395#c31

We can use send_sig_info(SEND_SIG_NOINFO) instead, since
614c517d7c00af1b26ded20646b329397d6f51a1 ("signals: SEND_SIG_NOINFO should
be considered as SI_FROMUSER()") SEND_SIG_NOINFO means "from user" and
therefore send_signal() will get the correct from_ancestor_ns = T flag.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 86b3796b0436..79aac93acf99 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -161,13 +161,12 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
                 rcu_read_lock();
 
                 /*
-                 * Use force_sig() since it clears SIGNAL_UNKILLABLE ensuring
-                 * any nested-container's init processes don't ignore the
-                 * signal
+                 * Any nested-container's init processes won't ignore the
+                 * SEND_SIG_NOINFO signal, see send_signal()->si_fromuser().
                  */
                 task = pid_task(find_vpid(nr), PIDTYPE_PID);
                 if (task)
-                        force_sig(SIGKILL, task);
+                        send_sig_info(SIGKILL, SEND_SIG_NOINFO, task);
 
                 rcu_read_unlock();