linux-kernel - Re: [PATCH 2/2] x86/ldt: allow to disable modify

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Message-ID: <20150804035451.GC31787@nazgul.tnic>
Date:	Tue, 4 Aug 2015 05:54:51 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Willy Tarreau <w@....eu>, Andy Lutomirski <luto@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"security@...nel.org" <security@...nel.org>,
	X86 ML <x86@...nel.org>, Sasha Levin <sasha.levin@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Jan Beulich <jbeulich@...e.com>,
	xen-devel <xen-devel@...ts.xen.org>
Subject: Re: [PATCH 2/2] x86/ldt: allow to disable modify_ldt at runtime

On Mon, Aug 03, 2015 at 11:45:24AM -0700, Andy Lutomirski wrote:
> P.P.P.S.  Who thought that IRET faults unmasking NMIs made any sense
> whatsoever when NMIs run on an IST stack?  Seriously, people?

What happened with asking Intel for a sane IRET-NG?

Should be relatively easy - take the current IRET microcode, get rid
of the nasty crap, allocate a new opcode and done. Validation should
actually have *less* to do and can reuse all current test cases.

:-)

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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