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

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Message-ID: <20150803231924.GA24043@1wt.eu>
Date:	Tue, 4 Aug 2015 01:19:24 +0200
From:	Willy Tarreau <w@....eu>
To:	Kees Cook <keescook@...omium.org>
Cc:	Andy Lutomirski <luto@...nel.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 2/2] x86/ldt: allow to disable modify_ldt at runtime

On Mon, Aug 03, 2015 at 03:35:15PM -0700, Kees Cook wrote:
> Yay for perm disable! Thank you! :)

Andy would like to see this evolve towards something possibly
more complete and/or generic. I think this needs more thoughts
and that we should possibly stick to 0/1 for now and decide how
we want to make this evolve later to cover permanent disable,
various ABIs, etc...

What do you think ?

Willy

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