Re: VFS, NFS security bug? Should CAP_MKNOD andCAP_LINUX_IMMUTABLE be added to CAP_FS_MASK?

[Serge E. Hallyn]

Quoting J. Bruce Fields (bfields@xxxxxxxxxxxx):
> On Wed, Mar 11, 2009 at 03:53:34PM +0300, Igor Zhbanov wrote:
> > Hello!
> > 
> > It seems that CAP_MKNOD and CAP_LINUX_IMMUTABLE were forgotten to be
> > added to CAP_FS_MASK_B0 in linux-2.6.x and to CAP_FS_MASK in
> > linux-2.4.x. Both capabilities affects file system and can be
> > considered file system capabilities.
> 
> Sounds right to me--I'd expect rootsquash to guarantee that new device
> nodes can't be created from the network.  Cc'ing random people from the
> git log for include/linux/capability.h in hopes they can help.

Yeah it seems reasonable.  If it is, then does that mean that we
also need CAP_SYS_ADMIN (to write selinux labels) and CAP_SETFCAP
(to set file capabilities) as well?

-serge
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