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authorEric W. Biederman <ebiederm@xmission.com>2015-01-07 08:10:09 -0600
committerEric W. Biederman <ebiederm@xmission.com>2015-07-01 10:36:35 -0500
commitceeb0e5d39fcdf4dca2c997bf225c7fc49200b37 (patch)
tree8e005dec00f79b8176f42070c176c43b3e3bf030 /fs
parent8c6cf9cc829fcd0b179b59f7fe288941d0e31108 (diff)
vfs: Ignore unlocked mounts in fs_fully_visible
Limit the mounts fs_fully_visible considers to locked mounts. Unlocked can always be unmounted so considering them adds hassle but no security benefit. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/namespace.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 63b9806235e6..8c7b8e0941b9 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3205,11 +3205,15 @@ static bool fs_fully_visible(struct file_system_type *type, int *new_mnt_flags)
((mnt->mnt.mnt_flags & MNT_ATIME_MASK) != (new_flags & MNT_ATIME_MASK)))
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)