linux-kernel - Re: [LKP] [PATCH] drm/radeon: Try to init amdkfd only if 64 bit kernel

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Date:	Wed, 07 Jan 2015 09:28:31 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Kees Cook <keescook@...omium.org>
Cc:	Oded Gabbay <oded.gabbay@....com>, Andi Kleen <ak@...ux.intel.com>,
	Alex Deucher <alexdeucher@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Dana Elifaz <Dana.Elifaz@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	Alexander Deucher <Alexander.Deucher@....com>,
	LKP ML <lkp@...org>
Subject: Re: [LKP] [PATCH] drm/radeon: Try to init amdkfd only if 64 bit kernel

Kees Cook <keescook@...omium.org> writes:
> On Sun, Jan 4, 2015 at 8:28 PM, Rusty Russell <rusty@...tcorp.com.au> wrote:
>> Kees, as far as I can tell you need another 0-terminated vmlinux.relocs
>> section for weak symbols.  These should not be relocated if already 0.
>
> A few questions:
>
> Why doesn't this break on 32-bit without kASLR? 32-bit does relocation
> by default, even without CONFIG_RANDOMIZE_BASE.

Well, the offset was 0 until I removed CONFIG_HIBERNATE.

> Are there any symbols that are NULL that aren't weak? I'd expect all
> strong symbols to have non-zero offsets, but I must be
> misunderstanding something here.

I don't think there would be.  Anyway, you might be able to filter them
out in x86/tools/relocs itself.

Cheers,
Rusty.
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