linux-kernel - Re: [PATCH] x86_64: Work around old gas bug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 26 Sep 2012 13:16:10 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Tao Guo <glorioustao@...il.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH] x86_64: Work around old gas bug


* Jan Beulich <JBeulich@...e.com> wrote:

> >>> On 26.09.12 at 10:28, Tao Guo <glorioustao@...il.com> wrote:
> > gas in binutils(2.16.91) could not parse parentheses within macro
> > parameters unless fully parenthesized, and this is a workaround to
> > make old gas work without generating below errors:
> > arch/x86/kernel/entry_64.S: Assembler messages:
> > arch/x86/kernel/entry_64.S:387: Error: too many positional arguments
> > arch/x86/kernel/entry_64.S:389: Error: too many positional arguments
> > arch/x86/kernel/entry_64.S:390: Error: too many positional arguments
> > arch/x86/kernel/entry_64.S:391: Error: too many positional arguments
> > arch/x86/kernel/entry_64.S:392: Error: too many positional arguments
> > arch/x86/kernel/entry_64.S:393: Error: too many positional arguments
> > arch/x86/kernel/entry_64.S:394: Error: too many positional arguments
> > 
> > Signed-off-by: Tao Guo <glorioustao@...il.com>
> 
> This looks okay now to me, but I'm somewhat reluctant to 
> formally ack it given that we know how broken those particular 
> gas versions are.

Well, assuming Tao Guo test-booted a kernel build with this old 
GAS version, we could apply this patch on a best-effort basis - 
the changes don't look particularly ugly. If other, unacceptable 
uglies or fragilities come up then we might balk.

Agreed?

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/