linux-kernel - [ 06/47] namespaces, pid_ns: fix leakage on fork() failure

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Message-Id: <20120518212649.790229737@linuxfoundation.org>
Date:	Fri, 18 May 2012 14:26:55 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mike Galbraith <efault@....de>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Louis Rilling <louis.rilling@...labs.com>
Subject: [ 06/47] namespaces, pid_ns: fix leakage on fork() failure

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mike Galbraith <efault@....de>

commit 5e2bf0142231194d36fdc9596b36a261ed2b9fe7 upstream.

Fork() failure post namespace creation for a child cloned with
CLONE_NEWPID leaks pid_namespace/mnt_cache due to proc being mounted
during creation, but not unmounted during cleanup.  Call
pid_ns_release_proc() during cleanup.

Signed-off-by: Mike Galbraith <efault@....de>
Acked-by: Oleg Nesterov <oleg@...hat.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Louis Rilling <louis.rilling@...labs.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/fork.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -47,6 +47,7 @@
 #include <linux/audit.h>
 #include <linux/memcontrol.h>
 #include <linux/ftrace.h>
+#include <linux/proc_fs.h>
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/ksm.h>
@@ -1438,6 +1439,8 @@ bad_fork_cleanup_io:
 	if (p->io_context)
 		exit_io_context(p);
 bad_fork_cleanup_namespaces:
+	if (unlikely(clone_flags & CLONE_NEWPID))
+		pid_ns_release_proc(p->nsproxy->pid_ns);
 	exit_task_namespaces(p);
 bad_fork_cleanup_mm:
 	if (p->mm)

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