netdev - Re: [PATCH bpf 5/7] bpf: fix direct packet write into pop/peek helpers

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Message-ID: <090dda68-b831-46fc-7b73-0873902df05e@polito.it>
Date:   Wed, 24 Oct 2018 17:30:21 -0500
From:   Mauricio Vasquez <mauricio.vasquez@...ito.it>
To:     Daniel Borkmann <daniel@...earbox.net>, ast@...nel.org
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH bpf 5/7] bpf: fix direct packet write into pop/peek
 helpers


On 10/24/18 3:05 PM, Daniel Borkmann wrote:
> Commit f1a2e44a3aec ("bpf: add queue and stack maps") probably just
> copy-pasted .pkt_access for bpf_map_{pop,peek}_elem() helpers, but
> this is buggy in this context since it would allow writes into cloned
> skbs which is invalid. Therefore, disable .pkt_access for the two.
>
> Fixes: f1a2e44a3aec ("bpf: add queue and stack maps")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> Cc: Mauricio Vasquez B <mauricio.vasquez@...ito.it>


Thanks for this as well.

Acked-by: Mauricio Vasquez B<mauricio.vasquez@...ito.it>