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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