linux-kernel - Re: [PATCH v2] x86: Preserve iopl on fork and execve

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Message-ID: <5552454C.8010702@zytor.com>
Date:	Tue, 12 May 2015 11:24:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
CC:	Alex Henrie <alexhenrie24@...il.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Doug Johnson <dougvj@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Tyler Hicks <tyhicks@...onical.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH v2] x86: Preserve iopl on fork and execve

On 05/12/2015 08:13 AM, Linus Torvalds wrote:
> On Mon, May 11, 2015 at 11:40 PM, Ingo Molnar <mingo@...nel.org> wrote:
>>
>>  - Nothing actually broke that people cared about in the last 2.5
>>    years, thus this might be one of the (very very rare) cases where
>>    preserving a breakage is the right thing to do.
> 
> Indeed. The Linux "no regressions" rule is not about some theoretical
> "the ABI changed". It's about actual observed regressions.
> 
> So if we can improve the ABI without any user program or workflow
> breaking, that's fine.
> 

But Linus, that would break dominix... ;)

	-hpa

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