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

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Message-ID: <CAGXu5jK-1DK3vLJekNnOLnr-_6mg21m96pNsdBFVMp4gFRUxnw@mail.gmail.com>
Date:	Mon, 3 Aug 2015 18:36:04 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Willy Tarreau <w@....eu>
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 3, 2015 at 4:19 PM, Willy Tarreau <w@....eu> wrote:
> 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 ?

That's probably the best way forward. I still think a generic syscall
disabling feature would be nice. :) I won't have time to work on it
for a little while, though.

-Kees

-- 
Kees Cook
Chrome OS Security
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