lkml.org 
[lkml]   [2014]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/3] [RFC] seccomp: give BPF x32 bit when restoring x32 filter
On 07/11/2014 09:11 AM, Paul Moore wrote:
> On Thursday, July 10, 2014 09:06:02 PM H. Peter Anvin wrote:
>> Incidentally: do seccomp users know that on an x86-64 system you can
>> recevie system calls from any of the x86 architectures, regardless of
>> how the program is invoked? (This is unusual, so normally denying those
>> "alien" calls is the right thing to do.)
>
> I obviously can't speak for all seccomp users, but libseccomp handles this by
> checking the seccomp_data->arch value at the start of the filter and killing
> (by default) any non-native architectures. If you want, you can change this
> default behavior or add support for other architectures (e.g. create a filter
> that allows both x86-64 and x32 but disallows x86, or any combination of the
> three for that matter).
>

OK, that seems reasonable.

-hpa



\
 
 \ /
  Last update: 2014-07-11 19:01    [W:0.125 / U:4.916 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site