linux-kernel - Re: [PATCH] Make LIST

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Date:	Tue, 20 May 2008 18:17:59 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] Make LIST_POISON less deadly (v3)

Andi Kleen wrote:
> Avi Kivity <avi@...ranet.com> writes:
>   
>>  
>> +config ILLEGAL_POINTER_VALUE
>> +       hex
>> +       default 0 if X86_32
>> +       default 0xffffc10000000000 if X86_64
>>     
>
> Don't make it exactly 0xffffc10000000000 but 0xffffc10000000000 + 0x1000000
> or so, otherwise list_entry() users which subtract offsets would still
> end up in user space and there might be actually something in there
> by default.
>   

The poison code adds a large offset (>1MB) so we're safe here.

-- 
error compiling committee.c: too many arguments to function

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