Re: Netfilter: suspicious RCU usage in __nft_rule_lookup

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On Fri, Oct 25, 2024 at 11:23:56AM +0200, Florian Westphal wrote:
> Matthieu Baerts <matttbe@xxxxxxxxxx> wrote:
> > While at it, I had a question related to the rules' list: in
> > __nft_release_basechain() from the same nf_tables_api.c file, list's
> > entries are not removed with the _rcu variant → is it OK to do that
> > because this function is only called last at the cleanup time, when no
> > other readers can iterate over the list? So similar to what is done in
> > __nft_release_table()?
> 
> Looks like __nft_release_basechain() is broken from start, I don't see
> how it can work, it doesn't call synchronize_rcu or anything like that
> afaics.

Right, it should unregister hooks, then wait for rcu grace period, and
finally release objects.

> No idea what to do here.

I'm looking into this.




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