Re: [PATCH bpf] xsk: Fix unaligned descriptor validation

[Martin KaFai Lau]

On 4/3/23 11:25 PM, Magnus Karlsson wrote:
> On Mon, 3 Apr 2023 at 16:38, Kal Conley <kal.conley@xxxxxxxxxxx> wrote:
> > Make sure unaligned descriptors that straddle the end of the UMEM are
> > considered invalid. Currently, descriptor validation is broken for
> > zero-copy mode which only checks descriptors at page granularity.
> > Descriptors that cross the end of the UMEM but not a page boundary may
> > be therefore incorrectly considered valid. The check needs to happen
> > before the page boundary and contiguity checks in
> > xp_desc_crosses_non_contig_pg. Do this check in
> > xp_unaligned_validate_desc instead like xp_check_unaligned already does.
>
> Thanks for catching this Kal.
>
> Acked-by: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>

Is this case covered by an existing test?