linux-kernel - Re: [PATCH] x86/boot: Refuse to build with data relocations

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Message-ID: <8bc4f1fd-c6f8-4643-becf-4f84be378807@zytor.com>
Date:	Fri, 13 May 2016 13:45:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
	Baoquan He <bhe@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/boot: Refuse to build with data relocations

On 05/12/16 15:54, Kees Cook wrote:
>>
>> It would be far better to warn on the *type* of relocations rather than in which section they feel.
> 
> I'm open to specific changes. What's the best way to detect what you want here?
> 

Use readelf -r and look for inappropriate relocation types (which are
basically the same ones that we should have to muck with for the main
kernel in relocs.c.)

	-hpa