linux-kernel - Re: [PATCH -tip] x86: headers - fix export private data to userspace

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Date:	Tue, 13 Jan 2009 11:03:03 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Harvey Harrison <harvey.harrison@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
Subject: Re: [PATCH -tip] x86: headers - fix export private data to	userspace

Cyrill Gorcunov wrote:
> | > | 
> | > | You can introduce symbols into the general namespace if *and only if*
> | > | they are in a header file that is invoked directly by the user.  In
> | > | other words, such a header file is unusable by libc, but setup.h doesn't
> | > | contain anything needed by libc in the first place.
> | > | 
> | > | 	-hpa
> | > | 
> | > 
> | > So we could just fence it by __KERNEL__?
> | > 
> | 
> | We might, as userspace shouldn't need COMMAND_LINE_SIZE anyway (see
> | other post), but I'm rather confused as how you got that from what I
> | wrote above.
> | 
> 
> The thing is that kernel headers are not only touched by libc.
> Someone could write a program and include setup.h there.
> Or I translated you wrong :)
> 

My whole point was that there are classes of symbols which may be
legitimately used by userspace *applications*, but not by libc.  Those
can live in the general namespace since they are included by explicit
user command.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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