linux-kernel - Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI

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 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:	Sun, 19 Feb 2012 15:34:39 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"hpanvin@...il.com" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to
 determine nested NMI

On Sun, 2012-02-19 at 05:46 -0800, hpanvin@...il.com wrote:
> Vsyscall page, not vdso...
> 

Peter,

My original patch was to check the %cs register against __KERNEL_CS, but
IIRC, you said that userspace can change that register to anything it
wanted before doing a long jump or something. Is this true for x86_64 as
well? I guess it would be because x86_64 can support 32bit apps.

Anyway, I'll add a check that makes sure that the RIP is less than the
FIXADDR sections as well.

-- Steve

--
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/