oss-security - Re: CVE-2017-13673 Qemu: vga: reachable assert failure during during display update

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Message-ID: <nycvar.YSQ.7.76.1709121258160.2226@wniryva>
Date: Tue, 12 Sep 2017 13:01:15 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: David Buchanan <d@...buchanan.co.uk>, Michael Tokarev <mjt@....msk.ru>
Subject: Re: CVE-2017-13673 Qemu: vga: reachable assert failure
 during during display update

+-- On Sun, 10 Sep 2017, Salvatore Bonaccorso wrote --+
|  As far as I can see, e.g. cpu_physical_memory_snapshot_get_dirty was only 
| introduced in v2.10.0-rc0. The upstream commit associated with the above 

  Right.

|  https://git.qemu.org/gitweb.cgi?p=qemu.git;a=commit;h=bfc56535f793c557aa754c50213fc5f882e6482d
| 
| which fixes
| 
|  https://git.qemu.org/gitweb.cgi?p=qemu.git;a=commit;h=fec5e8c92becad223df9d972770522f64aafdb72
| 
| introducing the use of dirty bitmap snapshots in vga_draw_graphic().
| 
| Do I miss something makeing it affecting as well earlier versions than
| 2.10?

There were two issues, one reproducer worked with Qemu 2.9.x, other didn't 
IIRC.

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

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