lkml.org 
[lkml]   [2007]   [Aug]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: NFS4 authentification / fsuid
From
On Thu, Aug 30, 2007 at 11:04:00AM -0400, Trond Myklebust wrote:
> With CIFS or other password based protocols (including RPCSEC_GSS)

Well, rpcsec_gss isn't inherently password based, and you can
authenticate in some way that doesn't actually give away your password
(or other long-lived credential).

> What I'm saying is that the superuser can pretty much do whatever it
> takes to grab either your kerberos password (e.g. install a keyboard
> listener), a stored credential (read the contents of your kerberos
> on-disk credential cache), or s/he can access the cached contents of the
> file by hunting through /dev/kmem.
>
> IOW: There is no such thing as security on a root-compromised machine.

And in theory a kernel could provide *some* guarantees against root,
right? (Is there some reason a unix-like kernel must provide such
things as /dev/kmem?)

--b.
-
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: 2007-08-30 23:47    [W:0.046 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site