linux-kernel - Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole

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Message-ID: <20090228044614.GA17082@elte.hu>
Date:	Sat, 28 Feb 2009 05:46:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Fri, 27 Feb 2009, Linus Torvalds wrote:
> > 
> > Ok, please explain this madness.
> > 
> > The whole crazy IS_COMPAT_TASK dance seems to be too messy 
> > for words. Why? What's going on?
> 
> Ok, I can see what's going on. And it's disgusting.
> 
> Just make everybody do that "is_compat_task()" thing. parisc 
> already did, and you just made x86-64 do so too. The only 
> remaining TIF_32BIT users are powerpc and sparc. So instead of 
> having this insane crud, please just add the trivial 
> definitions to the two remaining places, and we don't have to 
> have this insane mess. Ok?
> 
> It is clear that TIF_32BIT is _not_ a generic flag for 
> 32/64-bit system calls, so let's stop pretending it is, and 
> then having ugly special cases for when it's not.

Seconded.

	Ingo
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