Re: Trusted kernel patchset for Secure Boot lockdown

[Matthew Garrett]

On Thu, 2014-03-13 at 21:24 +0000, One Thousand Gnomes wrote:

> If I have CAP_SYS_RAWIO I can make arbitary ring 0 calls from userspace,
> trivially and in a fashion well known and documented.

How?

> You've missed a few others too - mem= (especially with exactmap) for
> example.

/dev/mem access is restricted, so what would this buy you? The potential
to have the kernel hand over a region belonging to hardware in response
to a userspace allocation?

-- 
Matthew Garrett <matthew.garrett@xxxxxxxxxx>
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