oss-security - CVE-2017-5993 Virglrenderer: host memory leakage when initialising blitter context

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Date: Wed, 15 Feb 2017 23:29:21 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Li Qiang <liqiang6-s@....cn>
Subject: CVE-2017-5993 Virglrenderer: host memory leakage when initialising
 blitter context

   Hello,

Virgil 3d project, used by Quick Emulator(Qemu) to implement 3D GPU support 
for the virtio GPU, is vulnerable to memory leakage issue. It could occur when 
a guest tries to initialise blitter context via 'VIRGL_CCMD_BLIT' command.

A guest user/process could use this flaw to leak host memory resulting in DoS.

Upstream patch:
---------------
   -> https://cgit.freedesktop.org/virglrenderer/commit/?id=6eb13f7a2dcf391ec9e19b4c2a79e68305f63c22

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1422438

This issue was reported by Li Qiang of 360.cn Inc.

'CVE-2017-5993' assigned via -> https://cveform.mitre.org/

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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