linux-kernel - Re: [PATCH] x86, nmi: workaround sti; hlt race vs nmi; intr

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]

Date:	Mon, 27 Sep 2010 11:17:59 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Alexander Graf <agraf@...e.de>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] x86, nmi: workaround sti; hlt race vs nmi; intr

  On 09/27/2010 11:15 AM, Alexander Graf wrote:
> >
> >  Wow, this is incredibly ugly :). Can't we just mask NMIs when the interrupt shadow is active?

I plan to do that, for all the code that's out there relying on on STI 
interrupt shadow masking NMIs.

> Yeah, that's me writing without thinking. So this means that the race can also happen on real hardware?
>

Yes.  At least on documented hardware.  Some (most? all?) hardware does 
mask NMIs after STI.

-- 
error compiling committee.c: too many arguments to function

--
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/