3.13.11-ckt22 -stable review patch. If anyone has any objections, please let
me know.
------------------
From: "Eric W. Biederman" <ebied...@xmission.com>
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 <ewindi...@docker.com>
Signed-off-by: "Eric W. Biederman" <ebied...@xmission.com>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
fs/namespace.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/namespace.c b/fs/namespace.c
index 01296f9..958e94a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3005,6 +3005,12 @@ bool fs_fully_visible(struct file_system_type *type)
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.
*/
--
1.9.1
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