Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH 08/28] SECURITY: Allow kernel services to override LSM settings for task actions [try #2] | Date | Mon, 10 Dec 2007 21:08:07 +0000 |
| |
Stephen Smalley <sds@tycho.nsa.gov> wrote:
> Otherwise, only other issue I have with this interface is it won't > generalize to dealing with nfsd, where we want to set the acting context > to a context we obtain from or determine based upon the client.
Are you speaking of security_kernel_act_as() and security_create_files_as() specifically? Or the task_struct::act_as override pointer in general?
I don't really know how nfsd wants to obtain and set its LSM context, so it's a bit difficult for me to make something that works for nfsd as well as cachefiles.
> Why can't cachefilesd just push a context into the kernel and pass that > into the hook as the acting context,
How does cachefilesd come up with such a context? Grab it from /etc/cachefilesd.conf?
I use to do that, but someone objected... Possibly Karl MacMillan.
> and then nfsd can do likewise using the context provided by the client or > obtained locally from exports for ordinary clients? Avoids the transition > SID computation altogether within the kernel and makes this more generic.
I seem to remember that I was told that it should be done this way, possibly by Karl MacMillan, but I don't remember exactly.
Now it's configured by cachefilesd.te:
type_transition cachefilesd_t kernel_t : process cachefiles_kernel_t;
David
| |