A couple of mount AVCs

[Paul Howarth]

Jason L Tibbitts III wrote:
> I'm experimenting with turning on Selinux for my FC5 desktops.  I took
> a machine that was kickstated with "selinux --disabled", fully
> updated, edited /etc/sysconfig/selinux to change "disabled" to
> "enforcing", rebooted and waited for the relabel.
> 
> Upon boot I get this twice:
> 
> audit(1155677507.814:309): avc:  denied  { mounton } for  pid=1566 comm="mount" name="mail" dev=dm-4 ino=393219 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=dir
> 
> /var/spool/mail is NFS supposed to be NFS mounted, but this AVC causes
> that mount to fail.  (Yes, IMAP will be my savior, but some people
> here still use /bin/mail.  Really.)  What's odd is that I can log in
> as root and type "mount /var/spool/mail" and it mounts fine.

Unmount /var/spool/mail

Try:
# service netfs start

This should try and fail to do the mount, just as it does at boot time.

Now try:
# chcon -t mnt_t /var/spool/mail
# service netfs start

This time it should work.

> We also have NFS-mounted user home directories via autofs; the map is
> in LDAP and nscd is running.  Every attempt to access a user home
> directory results in:
> 
> audit(1155738357.735:345): avc:  denied  { write } for  pid=7344 comm="mount" name="socket" dev=dm-4 ino=131097 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:nscd_var_run_t:s0 tclass=sock_file
> audit(1155738357.735:346): avc:  denied  { write } for  pid=7344 comm="mount" name="socket" dev=dm-4 ino=131097 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:nscd_var_run_t:s0 tclass=sock_file
> SELinux: initialized (dev 0:18, type nfs), uses genfs_contexts
> 
> and the mount actually succeeds.

What's the output of:
# getsebool use_nfs_home_dirs

It's probably set or you'd be having lots of other failures. It may be 
something that needs dontaudit-ing since it's actually working OK.

Paul.