linux-kernel - Re: [PATCH] THE LINUX/I386 BOOT PROTOCOL

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Date:	Thu, 31 Aug 2006 19:32:24 +0200
From:	Bodo Eggert <7eggert@...tempel.de>
To:	Andi Kleen <ak@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
	Alon Bar-Lev <alon.barlev@...il.com>,
	Matt Domsch <Matt_Domsch@...l.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	johninsd@....rr.com
Subject: Re: [PATCH] THE LINUX/I386 BOOT PROTOCOL - Breaking the 256 limit (ping)

Andi Kleen <ak@...e.de> wrote:
> On Wednesday 30 August 2006 20:59, H. Peter Anvin wrote:
>> Alon Bar-Lev wrote:

>> > This is not entirely true...
>> > All architectures sets saved_command_line variable...
>> > So I can add __init to the saved_command_line and
>> > copy its contents into kmalloced persistence_command_line at
>> > main.c.
>> > 
>> 
>> My opinion is that you should change saved_command_line (which already
>> implies a copy) to be the kmalloc'd version and call the fixed-sized
>> buffer something else.
> 
> It might be safer to rename everything. Then all users could be caught
> and audited. This would ensure saved_command_line is not accessed
> before the kmalloc'ed copy exists.

If you set the new *saved_cmdline=saved_cmdline_init, the users don't need
to be adjusted at all, and you won't have trouble with code that may be
run before or after kmallocking (if it exists).
-- 
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.

http://david.woodhou.se/why-not-spf.html
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