linux-kernel - Re: [PATCH 01/12] Security: Add CAP_COMPROMISE

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Message-ID: <51490B5F.7070909@zytor.com>
Date:	Tue, 19 Mar 2013 18:05:35 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
CC:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	kexec@...ts.infradead.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 01/12] Security: Add CAP_COMPROMISE_KERNEL

On 03/19/2013 06:02 PM, H. Peter Anvin wrote:
> 
> Looking at it in detail, EVERYTHING in CAP_SYS_RAWIO has the possibility
> of compromising the kernel, because they let device drivers be bypassed,
> which means arbitrary DMA, which means you have everything.
> 

Well, *unless* you have an iommu that you *actually know* is protecting you.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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