Drawing lessons from fatal SELinux bug #1054350

Simo Sorce simo at redhat.com
Sat Jan 25 20:05:34 UTC 2014

On Sat, 2014-01-25 at 14:32 -0500, Colin Walters wrote:
> On Sat, 2014-01-25 at 10:37 -0800, Josh Stone wrote:
> > Ok, sure, you can mount -o nosuid,noexec,nodev ... but this isn't the
> > default for btrfs subvolume paths AFAIK.  It needs to be a conscious
> > decision in whatever snapshot design we choose.
> This is definitely an issue with the OSTree design, since everything
> shares a physical partition (you can choose whatever block storage you
> want) - it's just hard links.
> I just filed:
> https://bugzilla.gnome.org/show_bug.cgi?id=722984
> for this.  

I forgot by gnome bugzilla password (again) so before I forget:
do not use .files or such it quickly becomes a mess. If you need to
annotate this kind of things I humbly suggest you add an xattr to the
file namespaced to ostree.

Alternatively, if you do not want to touch the original file at all,
keep a separate database where you note all these things, it will make
for a faster lookup in case you need bulk operations instead of having
to troll the whole tree.

> But really, now that KDBus is on the way, we can start using it for
> system services to replace many setuid binaries, like unix_chkpwd
> without losing the auditing trail and such that old indirection via
> dbus-daemon required.  That's a subject for a different thread though.

This is a good point, but a number of binaries are that way for legacy
reasons, or come from upstreams that care for portability and can't rely
on dbus (yet), so I think you need to care for the problem anyway.


Simo Sorce * Red Hat, Inc * New York

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