time/namespace: Fix time_for_children symlink

Looking at the contents of the /proc/PID/ns/time_for_children symlink shows
an anomaly:

$ ls -l /proc/self/ns/* |awk '{print $9, $10, $11}'
...
/proc/self/ns/pid -> pid:[4026531836]
/proc/self/ns/pid_for_children -> pid:[4026531836]
/proc/self/ns/time -> time:[4026531834]
/proc/self/ns/time_for_children -> time_for_children:[4026531834]
/proc/self/ns/user -> user:[4026531837]
...

The reference for 'time_for_children' should be a 'time' namespace, just as
the reference for 'pid_for_children' is a 'pid' namespace.  In other words,
the above time_for_children link should read:

/proc/self/ns/time_for_children -> time:[4026531834]

Fixes: 769071ac9f20 ("ns: Introduce Time Namespace")
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dmitry Safonov <dima@arista.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: Andrei Vagin <avagin@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/a2418c48-ed80-3afe-116e-6611cb799557@gmail.com

diff --git a/kernel/time/namespace.c b/kernel/time/namespace.c
index e6ba064..3b30288 100644 (file)
--- a/kernel/time/namespace.c
+++ b/kernel/time/namespace.c
@@ -447,6 +447,7 @@ const struct proc_ns_operations timens_operations = {
 
 const struct proc_ns_operations timens_for_children_operations = {
        .name           = "time_for_children",
+       .real_ns_name   = "time",
        .type           = CLONE_NEWTIME,
        .get            = timens_for_children_get,
        .put            = timens_put,