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Date: Fri, 4 Mar 2011 05:56:13 +0300
From: "Dmitry V. Levin" <ldv@...linux.org>
To: oss-security@...ts.openwall.com
Subject: Re: Suid mount helpers fail to anticipate RLIMIT_FSIZE

On Thu, Mar 03, 2011 at 09:42:17PM -0500, Dan Rosenberg wrote:
[...]
> I discovered that essentially every suid mount helper that uses
> addmntent() (or invokes util-linux mount, which in turn calls
> addmntent()) to add entries to /etc/mtab fails to anticipate a low
> value for RLIMIT_FSIZE, allowing unprivileged users to corrupt
> /etc/mtab and possibly manipulate mountpoint options.  Affected
> software includes at least:
[...]
> There are a few possible options

One more option is to replace /etc/mtab regular file with a symlink to
/proc/mounts, thus making any /etc/mtab editing unneeded.


-- 
ldv

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