This is a note to let you know that I've just added the patch titled
mnt: Fix fs_fully_visible to verify the root directory is visible
to the 4.0-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:
mnt-fix-fs_fully_visible-to-verify-the-root-directory-is-visible.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7e96c1b0e0f495c5a7450dc4aa7c9a24ba4305bd Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Date: Fri, 8 May 2015 16:36:50 -0500
Subject: mnt: Fix fs_fully_visible to verify the root directory is visible
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
commit 7e96c1b0e0f495c5a7450dc4aa7c9a24ba4305bd upstream.
This fixes a dumb bug in fs_fully_visible that allows proc or sys to
be mounted if there is a bind mount of part of /proc/ or /sys/ visible.
Reported-by: Eric Windisch <ewindisch@xxxxxxxxxx>
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/namespace.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3178,6 +3178,12 @@ bool fs_fully_visible(struct file_system
if (mnt->mnt.mnt_sb->s_type != type)
continue;
+ /* This mount is not fully visible if it's root directory
+ * is not the root directory of the filesystem.
+ */
+ 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.
*/
Patches currently in stable-queue which might be from ebiederm@xxxxxxxxxxxx are
queue-4.0/mnt-fix-fs_fully_visible-to-verify-the-root-directory-is-visible.patch
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