linux-kernel - Re: [PATCH v4 2/3] x86/ldt: Make modify

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Message-ID: <20150725163527.GE17659@1wt.eu>
Date:	Sat, 25 Jul 2015 18:35:27 +0200
From:	Willy Tarreau <w@....eu>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Borislav Petkov <bp@...en8.de>, 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>, Sasha Levin <sasha.levin@...cle.com>,
	"linux-kernel@...r.kernel.org" <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 v4 2/3] x86/ldt: Make modify_ldt optional

On Sat, Jul 25, 2015 at 09:03:54AM -0700, Andy Lutomirski wrote:
> On Sat, Jul 25, 2015 at 2:15 AM, Borislav Petkov <bp@...en8.de> wrote:
> > Is that "default y" going to turn into a "default n" after a grace
> > period?
> 
> Let's see how Willy's default-off sysctl plays out.  In the long run,
> maybe we'll have it compiled in but runtime-disabled by default.

That's the purpose at least at the beginning.

> There's a big community of users who *really* like using Wine :)

If distro vendors are willing to document a sysctl setting in order
to be able to use Wine in exchange for better security, I'm sure most
users will still prefer to stay safe.

Willy

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