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Date: Mon, 7 Feb 2005 11:28:37 -0800
From: "David S. Miller" <davem@davemloft.net>
Subject: Re: [patch 19/24] TASK_SIZE is variable.
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To: Andi Kleen <ak@suse.de>
Cc: rmk@arm.linux.org.uk, torvalds@osdl.org, akpm@osdl.org, dwmw2@infradead.org, linux-arch@vger.kernel.org
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On Mon, 7 Feb 2005 09:11:06 +0100
Andi Kleen <ak@suse.de> wrote:

> Also BTW your proposed check wouldn't catch all cases anyways,
> it would only handle the case where the access_ok() check is 
> done inside the KERNEL_DS. 

There must be a verify area done (either via explicit call or
via the user access macros which do not have the "__" prefix)
for each range of "userspace" accesses done through the uaccess.h accessors.