Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Thu, 26 Feb 2015 14:58:17 -0500
From: Daniel Micay <danielmicay@...il.com>
To: oss-security@...ts.openwall.com
CC: sstewartgallus00@...angara.bc.ca, ryao@...too.org
Subject: Re: CVE request: Linux kernel silently ignores MS_RDONLY for bind
 mounts

The commit adding this in 2.6.26 did actually document the weird
behaviour, so I guess it's just "by design". Users of the API like LXC,
Docker and systemd would likely have to iterate over /proc/self/mounts
and remount everything due to the way MS_REC works. Anyway, there's
clearly something wrong here when containers are claiming to have a
read-only mount feature but writes to the directory tree aren't prevented...


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