From: Avi Kivity <avi@qumranet.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH] Make LIST_POISON less deadly (v3)
Date: Tue, 20 May 2008 18:17:59 +0300 [thread overview]
Message-ID: <4832EBA7.2040007@qumranet.com> (raw)
In-Reply-To: <87fxsdgg6f.fsf@basil.nowhere.org>
Andi Kleen wrote:
> Avi Kivity <avi@qumranet.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
prev parent reply other threads:[~2008-05-20 15:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 11:39 [PATCH] Make LIST_POISON less deadly (v3) Avi Kivity
2008-05-20 11:55 ` Ingo Molnar
2008-05-20 15:15 ` Andi Kleen
2008-05-20 15:17 ` Avi Kivity [this message]
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