Re: Hitting verifier backtracking bug on 6.5.5 kernel

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On Fri, Oct 20, 2023 at 06:30:48PM +0200, Toke Høiland-Jørgensen wrote:
> Toke Høiland-Jørgensen <toke@xxxxxxxxxx> writes:
> > Shung-Hsi Yu <shung-hsi.yu@xxxxxxxx> writes:
> >
> >> Patch based on Andrii's analysis.
> >>
> >> Given that both BPF_END and BPF_NEG always operates on dst_reg itself
> >> and that bt_is_reg_set(bt, dreg) was already checked I believe we can
> >> just return with no futher action.
> >
> > Alright, manually applied this to bpf-next and indeed this enables the
> > netobserv-bpf-agent to load successfully. Care to submit a formal patch?
> > In that case please add my:
> >
> > Tested-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
> >
> > Thanks!
> 
> Friendly ping - are you planning to submit an official patch for this? :)

Yes, I do plan to send an offical one along with selftest as Alexei has
suggested. Once I've got my irrational fear of writing selftests overcame ;)

Should have it out before the end of this week.

Shung-Hsi

> -Toke




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