This is a note to let you know that I've just added the patch titled
vfs: Ignore unlocked mounts in fs_fully_visible
to the 3.14-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-ignore-unlocked-mounts-in-fs_fully_visible.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ceeb0e5d39fcdf4dca2c997bf225c7fc49200b37 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Date: Wed, 7 Jan 2015 08:10:09 -0600
Subject: vfs: Ignore unlocked mounts in fs_fully_visible
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
commit ceeb0e5d39fcdf4dca2c997bf225c7fc49200b37 upstream.
Limit the mounts fs_fully_visible considers to locked mounts.
Unlocked can always be unmounted so considering them adds hassle
but no security benefit.
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/namespace.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3031,11 +3031,15 @@ bool fs_fully_visible(struct file_system
if (mnt->mnt.mnt_root != mnt->mnt.mnt_sb->s_root)
continue;
- /* This mount is not fully visible if there are any child mounts
- * that cover anything except for empty directories.
+ /* This mount is not fully visible if there are any
+ * locked child mounts that cover anything except for
+ * empty directories.
*/
list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) {
struct inode *inode = child->mnt_mountpoint->d_inode;
+ /* Only worry about locked mounts */
+ if (!(mnt->mnt.mnt_flags & MNT_LOCKED))
+ continue;
if (!S_ISDIR(inode->i_mode))
goto next;
if (inode->i_nlink > 2)
Patches currently in stable-queue which might be from ebiederm@xxxxxxxxxxxx are
queue-3.14/vfs-ignore-unlocked-mounts-in-fs_fully_visible.patch
queue-3.14/vfs-remove-incorrect-debugging-warn-in-prepend_path.patch
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