lkml.org 
[lkml]   [2012]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Compat 32-bit syscall entry from 64-bit task!? [was: Re: [RFC,PATCH 1/2] seccomp_filters: system call filtering using BPF]
From
Date
On Tue, 2012-01-17 at 22:25 -0800, Linus Torvalds wrote:

> Of course, limiting things so that you cannot map the same page
> executably *and* writably is one solution - and a good idea regardless
> - so secure environments can still exist. But even then you could have
> races in a multi-threaded environment (they'd just be *much* harder to
> trigger for an attacker).

Gratuitous SELinux for the win e-mail! (Feel free to delete now) We
typically, for all confined domains, do not allow mapping anonymous
memory both W and X. Actually you can't even map it W and then map it
X...

Now if there is file which you have both W and X SELinux permissions
(which is rare, but not impossible) you could map it in two places. So
we can (and do) build SELinux sandboxes which address this.



\
 
 \ /
  Last update: 2012-01-18 16:09    [from the cache]
©2003-2011 Jasper Spaans