netdev - Re: [PATCH bpf-next v8 11/11] selftests/bpf: verify lsm

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Message-ID: <20220603015225.lc4q3vkmsfnkgdq2@kafai-mbp>
Date:   Thu, 2 Jun 2022 18:52:25 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org
Subject: Re: [PATCH bpf-next v8 11/11] selftests/bpf: verify lsm_cgroup
 struct sock access

On Wed, Jun 01, 2022 at 12:02:18PM -0700, Stanislav Fomichev wrote:
> sk_priority & sk_mark are writable, the rest is readonly.
> 
> One interesting thing here is that the verifier doesn't
> really force me to add NULL checks anywhere :-/
Are you aware if it is possible to get a NULL sk from some of the
bpf_lsm hooks ?