lkml.org 
[lkml]   [2018]   [Jun]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Spectre mitigation doesn't seem to work at all?!
From
Date
On 06/04/2018 at 04:12 PM Alan Cox wrote:
>> A malicious program most probably won't care about that. Therefore, my
>> next question is: which memory regions can be exploited by a malicious
>> program? The complete physical memory or only the memory provided to the
>> malicious program? Should be the latter if this approach should have any
>> impact.
>
> Spectre is not about memory regions. It's about speculative execution
> leaving measurable footprints. What footprints you leave depend upon what
> code you are executing. Thus the question becomes 'what can the target
> access'.
>
> In order to attack something you need both a way to influence the code
> concerned and a way to measure it. In addition it needs to have some
> secret you want.
>
> In practice that usually means something on the same system with its own
> memory space/privilege level. The usual cases then are user<->kernel and
> managed application<->runtime.

Would this be a practical test case: Gather keys and passwords used by a
ssh login by running a malicious program in parallel to sshd as another
ordinary user w/o root access.


Thanks,
Andreas

\
 
 \ /
  Last update: 2018-06-05 07:55    [W:0.040 / U:3.492 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site