linux-kernel - Re: [tip:x86/kaslr] x86, relocs: Add more per-cpu gold special cases

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Message-ID: <CAGXu5jLHmF7EtS8jmT_v5GTcFFxEBSmPbHuHvot2iYtmkvxmig@mail.gmail.com>
Date:	Wed, 16 Oct 2013 07:53:07 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michael Davidson <md@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/kaslr] x86, relocs: Add more per-cpu gold special cases

On Tue, Oct 15, 2013 at 11:56 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Kees Cook <keescook@...omium.org> wrote:
>
>> >> > The failure I saw triggered with fairly modern userspace:
>> >> >
>> >> >  GNU ld version 2.23.52.0.1-9.fc19 20130226
>> >> >
>> >> >  gcc version 4.8.1 20130603 (Red Hat 4.8.1-1) (GCC)
>> >>
>> >> Can you try with the gold linker?  When not using Gold, I can produce
>> >> a similar crash with GNU ld ver 2.23.2 but not 2.22.
>> >
>> > I'm not set up for Gold - but maybe others can try your experiment.
>> >
>> > If you can see/reproduce the 2.23 crash then maybe that fix will work
>> > for my testcase as well.
>>
>> I haven't isolated the problem with 2.23 yet, but I'll start digging.
>
> I've excluded tip:x86/kaslr from tip:master meanwhile.

Are you able to test the patch I sent? It fixed it for my ld 2.23
reproduction case.

-Kees

-- 
Kees Cook
Chrome OS Security
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