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

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Message-ID: <44F5E20A.8070504@zytor.com>
Date:	Wed, 30 Aug 2006 12:07:54 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...e.de>
CC:	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 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.
> 
> Disadvantage: more architectures to change.
> 

That would definitely be the safest option, and probably is the way to go.

	-hpa
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