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SubjectRe: [PATCH v4 2/2] module: Introduce module unload taint tracking
On Mon 2022-05-02 11:07 +0000, Christophe Leroy wrote:
> > @@ -150,6 +160,41 @@ int unregister_module_notifier(struct notifier_block *nb)
> > }
> > EXPORT_SYMBOL(unregister_module_notifier);
> >
> > +#ifdef CONFIG_MODULE_UNLOAD_TAINT_TRACKING
> > +static int try_add_tainted_module(struct module *mod)
> > +{
> > + struct mod_unload_taint *mod_taint;
> > +
> > + module_assert_mutex_or_preempt();
> > +
> > + list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, list,
> > + lockdep_is_held(&module_mutex)) {
> > + size_t len = strlen(mod_taint->name);
>
> Why do you need that strlen() at all, can't you just use strcmp() ?
> With strncmp() what happens if for instance mod_taint->name is "dead"
> and mod->name is "deadbeef" ?

Hi Christophe,

Thanks for your feedback.

I see that. Furthermore, the length of a module's name is fixed.
Hence strcmp() should be fine.


Kind regards,

--
Aaron Tomlin
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