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Date:   Wed, 09 Dec 2020 14:51:44 +0100
From:   Toke Høiland-Jørgensen <>
To:     Jakub Kicinski <>
Cc:     "David S. Miller" <>,
        Daniel Borkmann <>,
        Alexei Starovoitov <>,
        Andrii Nakryiko <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        John Fastabend <>,
        KP Singh <>,
        Jesper Dangaard Brouer <>,
        "Michael S. Tsirkin" <>,
        Romain Perier <>,
        Allen Pais <>,
        Grygorii Strashko <>,
        Simon Horman <>,
        "Gustavo A. R. Silva" <>,
        Lorenzo Bianconi <>,
        Wei Yongjun <>,
        Jiri Benc <>,,,,
Subject: Re: [PATCH bpf v3 3/7] netdevsim: Add debugfs toggle to reject BPF
 programs in verifier

Toke Høiland-Jørgensen <> writes:

> From: Toke Høiland-Jørgensen <>
> This adds a new debugfs toggle ('bpf_bind_verifier_accept') that can be
> used to make netdevsim reject BPF programs from being accepted by the
> verifier. If this toggle (which defaults to true) is set to false,
> nsim_bpf_verify_insn() will return EOPNOTSUPP on the last
> instruction (after outputting the 'Hello from netdevsim' verifier message).
> This makes it possible to check the verification callback in the driver
> from in selftests, since the verifier now clears the
> verifier log on a successful load, hiding the message from the driver.
> Fixes: 6f8a57ccf85 ("bpf: Make verifier log more relevant by default")

Ugh, the patchwork bot pointed out that I somehow managed to truncate
the commit ID here; apologies, will send a v4.


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