netdev - Re: [PATCH bpf 3/7] netdevsim: Add debugfs toggle to reject BPF programs in verifier

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Message-ID: <87lfed9ag1.fsf@toke.dk>
Date:   Fri, 04 Dec 2020 10:39:42 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Romain Perier <romain.perier@...il.com>,
        Allen Pais <apais@...ux.microsoft.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Simon Horman <simon.horman@...ronome.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Jiri Benc <jbenc@...hat.com>, oss-drivers@...ronome.com,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf 3/7] netdevsim: Add debugfs toggle to reject BPF
 programs in verifier

Jakub Kicinski <kuba@...nel.org> writes:

> On Thu, 03 Dec 2020 22:35:20 +0100 Toke Høiland-Jørgensen wrote:
>> diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
>> index 827fc80f50a0..d1d329af3e61 100644
>> --- a/drivers/net/netdevsim/netdevsim.h
>> +++ b/drivers/net/netdevsim/netdevsim.h
>> @@ -190,6 +190,7 @@ struct nsim_dev {
>>  	struct bpf_offload_dev *bpf_dev;
>>  	bool bpf_bind_accept;
>>  	u32 bpf_bind_verifier_delay;
>> +	bool bpf_bind_verifier_accept;
>>  	struct dentry *ddir_bpf_bound_progs;
>
> nit: if you respin please reorder the bpf_bind_verifier_* fields so
> that the structure packs better.

Ah, good point, will do!

> Acked-by: Jakub Kicinski <kuba@...nel.org>
>
> Thanks for fixing this test!

You're welcome :)

I'll see if I can't get our CI people to also run it regularly so we can
avoid it regressing again...

-Toke