linux-kernel - Re: asm-x86/byteorder.h, CONFIG_X86

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Message-ID: <488B6A5F.8000706@zytor.com>
Date:	Sat, 26 Jul 2008 14:18:07 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Harvey Harrison <harvey.harrison@...il.com>,
	Olaf Hering <olaf@...fle.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: asm-x86/byteorder.h, CONFIG_X86_BSWAP leaks to userland

Arjan van de Ven wrote:
\>
> It is also not the kernels job to provide this sort of functionality to
> userspace programs. At all. This is gcc/glibc/etc's job.
> 
> Rule of thumb: the kernel does not provide code for compiling inside
> userspace programs.
> 
> (As opposed to providing datastructures that userspace programs can use
> to talk to the kernel).
> 

That's a fine rule of thumb, but we have 17 years of legacy to deal with 
here, too.

	-hpa

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