lkml.org 
[lkml]   [2014]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Trusted kernel patchset for Secure Boot lockdown
Date
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@nebula.com>
\
 
 \ /
  Last update: 2014-03-13 23:01    [W:0.105 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site