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Date: Wed, 19 Jul 2017 16:12:37 -0700
From: Kees Cook <keescook@...omium.org>
To: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Christoph Hellwig <hch@...radead.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Jann Horn <jannh@...gle.com>, 
	Eric Biggers <ebiggers3@...il.com>, Elena Reshetova <elena.reshetova@...el.com>, 
	Hans Liljestrand <ishkamiel@...il.com>, Greg KH <gregkh@...uxfoundation.org>, 
	Alexey Dobriyan <adobriyan@...il.com>, "Serge E. Hallyn" <serge@...lyn.com>, arozansk@...hat.com, 
	Davidlohr Bueso <dave@...olabs.net>, Manfred Spraul <manfred@...orfullife.com>, 
	"axboe@...nel.dk" <axboe@...nel.dk>, James Bottomley <James.Bottomley@...senpartnership.com>, 
	"x86@...nel.org" <x86@...nel.org>, Arnd Bergmann <arnd@...db.de>, "David S. Miller" <davem@...emloft.net>, 
	Rik van Riel <riel@...hat.com>, LKML <linux-kernel@...r.kernel.org>, 
	linux-arch <linux-arch@...r.kernel.org>, 
	"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v6 2/2] x86/refcount: Implement fast refcount overflow protection

On Wed, Jul 19, 2017 at 12:37 PM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> +#define ASM_UNREACHABLE                                                        \
> +       "999: .pushsection .discard.unreachable\n\t"                    \
> +       ".long 999b - .\n\t"                                            \
> +       ".popsection\n\t"

Will this end up running into the same bug fixed with
3d1e236022cc1426b0834565995ddee2ca231cee and the __LINE__ macro? I
could tell under which conditions gcc would do this kind of merging...

-Kees

-- 
Kees Cook
Pixel Security

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