Re: [AppArmor 39/41] AppArmor: Profile loading and manipulation, pathname matching

Pavel Machek
2007-04-16T07:40:00Z

Hi!

> > > +
> > > + /* get optional subprofiles */
> > > + if (aa_is_nameX(e, AA_LIST, "hats")) {
> > > + while (!aa_is_nameX(e, AA_LISTEND, NULL)) {
> > > + struct aa_profile *subprofile;
> > > + subprofile = aa_unpack_profile(e);
> >
> > Is there any check that would guard the recursion from stack
> > overflow on malicious input?
>
> It's nice to check for consistency though, so we're adding that. Profile
> loading is a trusted operation, at least so far, and so security wise we
> don't actually have to care --- if loading an invalid profile can bring down
> the system, then that's no worse than an arbitrary module that crashes the
> machine. Not sure if there will ever be user loadable profiles; at least at
> that point we had to care.

It is not a _security_ problem, but face it, mount("/very weird
filename") is not expected to crash the kernel, either. It is
quality-of-impelmentation problem.

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