linux-kernel - Re: Sanitize CPU-state when switching from virtual-8086 mode to other task

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <52C347F0.8070902@zytor.com>
Date:	Tue, 31 Dec 2013 14:40:48 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	halfdog <me@...fdog.net>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Sanitize CPU-state when switching from virtual-8086 mode to other
 task

On 12/31/2013 11:21 AM, Konrad Rzeszutek Wilk wrote:
> 
> So, I am wondering if this is related to " x86/fpu: CR0.TS should be set before trap
> into PV guest's #NM exception handle" which does have a similar pattern - you
> do enough of the task switches and the FPU is screwed.
> 
> See http://mid.gmane.org/1383720072-6242-1-git-send-email-gaoyang.zyh@taobao.com
> 
> (I thought there was a thread about this on LKML too but I can't
> find it).

That would be a bug in Xen, so I guess you're surmising a similar bug in
VirtualBox?

	-hpa


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/