Commit 5e2bf014 authored May 10, 2012 by Mike Galbraith Committed by Linus Torvalds May 10, 2012

namespaces, pid_ns: fix leakage on fork() failure



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@gmx.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Louis Rilling <louis.rilling@kerlabs.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 4998a6c0

kernel/fork.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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>
		@@ -1464,6 +1465,8 @@ 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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