tree 984891e348c4ed58d8432aa9055b95ec89e5bf89
parent a6138db815df5ee542d848318e5dae681590fccd
author Eric W. Biederman <ebiederm@xmission.com> 1406592656 -0700
committer Eric W. Biederman <ebiederm@xmission.com> 1406851937 -0700

mnt: Move the test for MNT_LOCK_READONLY from change_mount_flags into do_remount

There are no races as locked mount flags are guaranteed to never change.

Moving the test into do_remount makes it more visible, and ensures all
filesystem remounts pass the MNT_LOCK_READONLY permission check.  This
second case is not an issue today as filesystem remounts are guarded
by capable(CAP_DAC_ADMIN) and thus will always fail in less privileged
mount namespaces, but it could become an issue in the future.

Cc: stable@vger.kernel.org
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>