[systemd-devel] [PATCH] SMACK: assign * label to /tmp when using SMACK.

[Karel Zak]

On Thu, Oct 31, 2013 at 01:20:18PM -0700, Kok, Auke-jan H wrote:
> >  BTW, for SELinux we remove selinux specific mount options in
> >  userspace (in mount(8)) if the kernel does not support selinux.
> >
> >  It help us to make command line or fstab setting independent on the
> >  current kernel features.
> >
> >  Maybe we can use the same for SMACK, is there any way how to
> >  determine that the system uses SMACK? (/proc/<something> or so...).
> >  -- for selinux we check for /sys/fs/selinux or /selinux.
> 
> Ohh yes that would be so nice.
> 
> You've got your choice for detecting smack, but I like
> stat(/sys/fs/smackfs) == 0 the best so far. You can parse
> /proc/filesystems for smackfs too, but that's obviously more complex.
> This method works with 3.9 and above, as that's when we made sysfs
> hold the mount point for smackfs.
> 
> I assume we're talking about this code here:
> 
> https://github.com/karelzak/util-linux/blob/master/libmount/src/context_mount.c#L181

 Yes, the "se_rem" code (with SELinux is it tricky, because old
 kernels don't support selinux options remount, options duplication is
 problem etc.. I guess that for SMACK it will be less complex :-). 
 
 Do you have somewhere list of the smack mount options? I'll prepare
 the patch.
 
 BTW, the options should be also documented in mount.8 man page :-)

    Karel


-- 
 Karel Zak  <kzak at redhat.com>
 http://karelzak.blogspot.com