lkml.org 
[lkml]   [2007]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 2/3] MAP_NOZERO - implement sys_brk2()
On Wed, 27 Jun 2007, Davide Libenzi wrote:

> On Wed, 27 Jun 2007, Nicholas Miell wrote:
>
> > 1) euid is not sufficient, you need to store away arbitrary LSM
> > information and call LSM hooks to decide security equivalence. The same
> > applies to VServer or whatever other container system you use.
>
> The EUID that is used now, can easily be any cookie. It can be an LSM
> cookie (if LSM is active in the system). We don't do complex checks, like
> group permission & Co. We assume that if a UID-cookie had such data
> available (or it generated it), it can have it back uncleared.

(looking through the LSM/SeLinux jungle)
Also, LSM/SeLinux could disable completely the feature, at request. Just
assign a known-to-be-invalid UID to mm->owner_uid (passign through
an(other) hook), and pages will never be recycled.



- Davide


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-06-28 05:01    [W:0.054 / U:0.636 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site