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

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Date:	Mon, 27 Jul 2015 08:53:54 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
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>,
	"linux-kernel@...r.kernel.org" <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 Mon, Jul 27, 2015 at 8:36 AM, Boris Ostrovsky
<boris.ostrovsky@...cle.com> wrote:
> 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.

I misplaced the fix in the wrong git commit, so I failed to sent it.  Oops.

I just sent v4.1 of patch 3.  Can you try that?

>
> -boris



-- 
Andy Lutomirski
AMA Capital Management, LLC
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