linux-kernel - [PATCH 5.6 161/254] time/namespace: Fix time_for

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Date:   Thu, 16 Apr 2020 15:24:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Kerrisk <mtk.manpages@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Safonov <dima@...sta.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Andrei Vagin <avagin@...il.com>
Subject: [PATCH 5.6 161/254] time/namespace: Fix time_for_children symlink

From: Michael Kerrisk (man-pages) <mtk.manpages@...il.com>

commit b801f1e22c23c259d6a2c955efddd20370de19a6 upstream.

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@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Dmitry Safonov <dima@...sta.com>
Acked-by: Christian Brauner <christian.brauner@...ntu.com>
Acked-by: Andrei Vagin <avagin@...il.com>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/a2418c48-ed80-3afe-116e-6611cb799557@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/time/namespace.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/time/namespace.c
+++ b/kernel/time/namespace.c
@@ -446,6 +446,7 @@ const struct proc_ns_operations timens_o
 
 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,