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Message-ID: <CAGXu5j+EkpmO2tB71n9rEjb_6GfWza3qBLUDTuhjZwnAYTX5WA@mail.gmail.com>
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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