lkml.org 
[lkml]   [2007]   [Jun]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching
david@lang.hm wrote:
> On Sun, 10 Jun 2007, Pavel Machek wrote:
>> But you have that regex in _user_ space, in a place where policy
>> is loaded into kernel.
>
> then the kernel is going to have to call out to userspace every time a
> file is created or renamed and the policy is going to be enforced
> incorrectly until userspace finished labeling/relabeling whatever is
> moved. building this sort of race condigion for security into the kernel
> is highly questionable at best.
>
>> AA has regex parser in _kernel_ space, which is very wrong.
>
> see Linus' rants about why it's not automaticaly the best thing to move
> functionality into userspace.
>
> remember that the files covered by an AA policy can change as files are
> renamed. this isn't the case with SELinux so it doesn't have this sort
> of problem.

How about using the inotify interface on / to watch for file changes and
updating the SELinux policies on the fly. This could be done from a
userspace daemon and should require minimal SELinux changes.

The only possible problems I can see are the (hopefully) small gap
between the file change and updating the policy and the performance
problems of watching the whole system for changes.

Just my $0.02.

Jack
-
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: 2007-06-14 21:19    [W:0.142 / U:0.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site