linux-kernel - Re: Credentials test patch

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Date:	Tue, 18 Sep 2007 12:44:17 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	David Howells <dhowells@...hat.com>
Cc:	viro@....linux.org.uk, hch@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: Credentials test patch

On Tue, 2007-09-18 at 17:33 +0100, David Howells wrote:
> Hi Al, Christoph,
> 
> Here's a new version of my credentials patch.  It's still very basic, with
> only Ext3, (V)FAT, NFS, AFS, SELinux and keyrings compiled in on an x86_64
> arch kernel.  The patched kernel compiles, links and runs.
> 
> I've made the following major changes to the patch:
> 
>  (1) System calls that might want to use the credentials call
>      update_current_cred() before calling into the VFS or whatever.  This
>      allows the keyring pointers in the cred struct to be updated.
> 
>  (2) I've got rid of current_cred(), __current_cred() and the accessors for
>      current's fsuid, fsgid and group list.  Instead you just use
>      current->cred->whatever.  You don't need RCU to read the current threads
>      credentials as only you are permitted to change them.
> 
> David
> ---

What about the process' capabilities? Shouldn't they also be part of a
credential?

Cheers
  Trond

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