This is a note to let you know that I've just added the patch titled
vfs: Is mounted should be testing mnt_ns for NULL or error.
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vfs-is-mounted-should-be-testing-mnt_ns-for-null-or-error.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 260a459d2e39761fbd39803497205ce1690bc7b1 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Date: Mon, 20 Jan 2014 15:26:15 -0800
Subject: vfs: Is mounted should be testing mnt_ns for NULL or error.
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
commit 260a459d2e39761fbd39803497205ce1690bc7b1 upstream.
A bug was introduced with the is_mounted helper function in
commit f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e
Author: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Sat Jun 9 00:59:08 2012 -0400
get rid of ->mnt_longterm
it's enough to set ->mnt_ns of internal vfsmounts to something
distinct from all struct mnt_namespace out there; then we can
just use the check for ->mnt_ns != NULL in the fast path of
mntput_no_expire()
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
The intent was to test if the real_mount(vfsmount)->mnt_ns was
NULL_OR_ERR but the code is actually testing real_mount(vfsmount)
and always returning true.
The result is d_absolute_path returning paths it should be hiding.
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/mount.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -73,7 +73,7 @@ static inline int mnt_has_parent(struct
static inline int is_mounted(struct vfsmount *mnt)
{
/* neither detached nor internal? */
- return !IS_ERR_OR_NULL(real_mount(mnt));
+ return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
}
extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
Patches currently in stable-queue which might be from ebiederm@xxxxxxxxxxxx are
queue-3.10/vfs-is-mounted-should-be-testing-mnt_ns-for-null-or-error.patch
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