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

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Message-ID: <44F71F28.9040108@zytor.com>
Date:	Thu, 31 Aug 2006 10:40:56 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	7eggert@....de
CC:	Andi Kleen <ak@...e.de>, 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)

Bodo Eggert wrote:
> 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).

True for C code, but not for assembly.

	-hpa

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