linux-kernel - Re: [PATCH] Kconfig: Make config Filter access to /dev/mem default y

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Date:	Thu, 15 Apr 2010 12:43:09 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Michal Svoboda <michal.svoboda@...nts.felk.cvut.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Kconfig: Make config Filter access to /dev/mem default
 y

On Thu, 15 Apr 2010, Michal Svoboda wrote:

> > Have you ever successfully attack by this way? If CONFIG_STRICT_DEVMEM
> > is not set, the /dev/mem access is filtered in pat code.
> 
> If that option doesn't add any protection, what's it good for?

Access to /dev/mem being filtered in PAT obviously applies only to x86. 

Architectures which don't do such filtering in their respective 
phys_mem_access_prot_allowed() still need this option.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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