linux-kernel - Re: [PATCH v5 4/4] x86/ldt: Make modify

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Date:	Tue, 28 Jul 2015 22:51:56 +0200
From:	Willy Tarreau <w@....eu>
To:	Kees Cook <keescook@...omium.org>
Cc:	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"security@...nel.org" <security@...nel.org>,
	X86 ML <x86@...nel.org>, Borislav Petkov <bp@...en8.de>,
	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 v5 4/4] x86/ldt: Make modify_ldt optional

On Tue, Jul 28, 2015 at 01:42:20PM -0700, Kees Cook wrote:
> On Tue, Jul 28, 2015 at 1:03 PM, Willy Tarreau <w@....eu> wrote:
> > Hi Kees,
> >
> > On Tue, Jul 28, 2015 at 09:56:12AM -0700, Kees Cook wrote:
> >> I look forward to the runtime disabling patch. :)
> >
> > Did you get my response to your comments regarding the proposed patch ?
> >
> > I can rebase it and update it if needed, I just want to make sure
> > everyone's on the same line regarding this.
> 
> Yeah, I'm fine with what you have. I'd still like a "off until next
> reboot", but I'll live. :)

That's an improvement we can bring later with special value "-1" which is
even less than zero.

Thanks,
Willy

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