Re: [PATCH bpf-next v1 2/3] bpf: Zero index arg error string for dynptr and iter

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On Thu, 28 Nov 2024 at 00:06, Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx> wrote:
>
> On Thu, 28 Nov 2024 at 00:01, Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx> wrote:
> >
> > Andrii spotted that process_dynptr_func's rejection of incorrect
> > argument register type will print an error string where argument numbers
> > are not zero-indexed, unlike elsewhere in the verifier.  Fix this by
> > subtracting 1 from regno. The same scenario exists for iterator
> > messages. Fix selftest error strings that match on the exact argument
> > number while we're at it to ensure clean bisection.
> >
> > Suggested-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
> > Signed-off-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
> > --
>
> When working on this, I noticed the same situation exists in IRQ
> save/restore v4.
>
> There are several options:
> 1. If this lands after IRQ series, I can respin and fix regno use in
> process_irq_flag.
> 2. Maintainer landing IRQ series can s/regno/regno - 1/ in
> process_irq_flag, selftests don't match on argument number.
> 3. I can respin IRQ series v5 with this addressed now.
> 4. If this lands before IRQ series, I can respin IRQ series and make the fix.
> 5. It can be a follow up for IRQ series.
>
> Let me know whichever seems better.

Fixed in IRQ save/restore v5, so ignore.




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