From: Eric W. Biederman <ebiederm@xmission.com>
Date: Fri, 22 Mar 2013 10:10:15 +0000 (-0700)
Subject: vfs: Add a mount flag to lock read only bind mounts
X-Git-Tag: v3.9-rc5~21^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90563b198e4c6674c63672fae1923da467215f45;p=pandora-kernel.git

vfs: Add a mount flag to lock read only bind mounts

When a read-only bind mount is copied from mount namespace in a higher
privileged user namespace to a mount namespace in a lesser privileged
user namespace, it should not be possible to remove the the read-only
restriction.

Add a MNT_LOCK_READONLY mount flag to indicate that a mount must
remain read-only.

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