linux-kernel - Re: [PATCH] Make LIST

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Message-ID: <87fxsdgg6f.fsf@basil.nowhere.org>
Date:	Tue, 20 May 2008 17:15:36 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Avi Kivity <avi@...ranet.com>
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)

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.

-Andi

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