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Message-ID: <4F902A9F.4060309@redhat.com>
Date: Thu, 19 Apr 2012 09:09:19 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request -- kernel: macvtap: zerocopy: vector
length is not validated before pinning user pages
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On 04/19/2012 08:28 AM, Petr Matousek wrote:
> Currently we do not validate the vector length before calling
> get_user_pages_fast(), host stack could be easily overflowed by
> malicious guest driver who gives us a descriptors with length
> greater than MAX_SKB_FRAGS.
>
> A privileged guest user could use this flaw to induce stack
> overflow on the host with attacker non-controlled data (some bits
> can be guessed, as it will be pointers to kernel memory) but with
> attacker controlled length.
>
> Proposed fix thread:
> http://marc.info/?l=linux-netdev&m=133455718001608&w=2
>
> References: https://bugzilla.redhat.com/show_bug.cgi?id=814278
>
> Thanks,
Please use CVE-2012-2119 for this issue.
- --
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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