linux-kernel - Re: [PATCH v4 0/3] x86: modify_ldt improvement, test, and config option

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Message-ID: <55B64FEA.70204@oracle.com>
Date:	Mon, 27 Jul 2015 11:36:10 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>
CC:	"security@...nel.org" <security@...nel.org>,
	X86 ML <x86@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Jan Beulich <jbeulich@...e.com>,
	xen-devel <xen-devel@...ts.xen.org>
Subject: Re: [PATCH v4 0/3] x86: modify_ldt improvement, test, and config
 option

On 07/25/2015 01:36 AM, Andy Lutomirski wrote:
> Here's v3.  It fixes the "dazed and confused" issue, I hope.  It's also
> probably a good general attack surface reduction, and it replaces some
> scary code with IMO less scary code.
>
> Also, servers and embedded systems should probably turn off modify_ldt.
> This makes that possible.
>
> Xen people, can you take a look at this?
>
> Willy and Kees: I left the config option alone.  The -tiny people will
> like it, and we can always add a sysctl of some sort later.
>
> Changes from v3:
>   - Hopefully fixed Xen.

32b-on-32b fails in the same manner. (but non-zero LDT is taken care of)

>   - Fixed 32-bit test case on 32-bit native kernel.

I am not sure I see what changed.

-boris
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