linux-kernel - Re: [PATCH] asm-generic: uaccess: fix up local access

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Date:	Sun, 14 Jun 2009 12:24:53 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Robin Getz <rgetz@...ckfin.uclinux.org>
Subject: Re: [PATCH] asm-generic: uaccess: fix up local access_ok() usage

On Sunday 14 June 2009, Mike Frysinger wrote:
> in the Blackfin implementation, a protection violation is an
> exception, exceptions cannot be nested, there is no prioritization
> between exceptions, and a double exception is (hardware)
> unrecoverable.  so we need to catch pointers given to us from
> userspace.  if the kernel attempted to utilize that bad pointer, that
> is an exception in supervisor mode which is (software) unrecoverable
> -- our exception handler detects this and forces the system to panic.

Ok, I see. In that case it's obviously better to to include your patch 3/4.

	Arnd <><
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