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authorEric W. Biederman <ebiederm@xmission.com>2015-01-07 08:10:09 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-07-10 10:37:59 -0700
commitcc7fde84c9f0c8f8e62d01ed4c036b51c6b83c34 (patch)
treef8e72a67d3d03ec01959c0e8a57395beaca95e24 /fs
parent32e55895a1c1fbdc1cfe5c75104d92810dbcbcbe (diff)
vfs: Ignore unlocked mounts in fs_fully_visible
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@xmission.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 2faa7eacb62b..fc99d185a477 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3031,11 +3031,15 @@ bool fs_fully_visible(struct file_system_type *type)
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)