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Message-ID: <20120419142819.GH29881@dhcp-25-225.brq.redhat.com>
Date: Thu, 19 Apr 2012 16:28:20 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE request -- kernel: macvtap: zerocopy: vector length is not
validated before pinning user pages
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,
--
Petr Matousek / Red Hat Security Response Team
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