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Message-ID: <20160518082837.GA13028@lorien.valinor.li>
Date: Wed, 18 May 2016 10:28:37 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: OSS Security Mailinglist <oss-security@...ts.openwall.com>
Subject: CVE Request: Linux: information leak in Rock Ridge Extensions to
iso9660 -- fs/isofs/rock.c
Hi
The following commit in Linux v4.6 addresses an information leak
caused by not properly handling NM entries containing NUL. Quoting the
commit message:
> Subject: get_rock_ridge_filename(): handle malformed NM entries
>
> Payloads of NM entries are not supposed to contain NUL. When we run
> into such, only the part prior to the first NUL goes into the
> concatenation (i.e. the directory entry name being encoded by a bunch
> of NM entries). We do stop when the amount collected so far + the
> claimed amount in the current NM entry exceed 254. So far, so good,
> but what we return as the total length is the sum of *claimed*
> sizes, not the actual amount collected. And that can grow pretty
> large - not unlimited, since you'd need to put CE entries in
> between to be able to get more than the maximum that could be
> contained in one isofs directory entry / continuation chunk and
> we are stop once we'd encountered 32 CEs, but you can get about 8Kb
> easily. And that's what will be passed to readdir callback as the
> name length. 8Kb __copy_to_user() from a buffer allocated by
> __get_free_page()
>
> Cc: stable@...r.kernel.org # 0.98pl6+ (yes, really)
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Upstream commit: https://git.kernel.org/linus/99d825822eade8d827a1817357cbf3f889a552d6 (v4.6)
Can you please assign a CVE for this issue?
Regards,
Salvatore
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