From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: KP Singh <kpsingh@chromium.org>
Cc: open list <linux-kernel@vger.kernel.org>,
bpf <bpf@vger.kernel.org>, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Paul Turner <pjt@google.com>, Jann Horn <jannh@google.com>,
Hao Luo <haoluo@google.com>
Subject: Re: [PATCH bpf-next v2 7/8] bpf: Add tests for task_local_storage
Date: Tue, 3 Nov 2020 17:57:32 -0800 [thread overview]
Message-ID: <CAADnVQLKhmA49RGH=SSCg3qHxZOzU5bHp+sw+Yw7M_7KB0zD4g@mail.gmail.com> (raw)
In-Reply-To: <CACYkzJ6uc4fbRMNmj3kFeSu=V2JqWruJLFjMnPet_HXW-EdRng@mail.gmail.com>
On Tue, Nov 3, 2020 at 5:55 PM KP Singh <kpsingh@chromium.org> wrote:
>
> [...]
>
> > >
> > > I saw the docs mention that these are not exposed to tracing programs due to
> > > insufficient preemption checks. Do you think it would be okay to allow them
> > > for LSM programs?
> >
> > hmm. Isn't it allowed already?
> > The verifier does:
> > if ((is_tracing_prog_type(prog_type) ||
> > prog_type == BPF_PROG_TYPE_SOCKET_FILTER) &&
> > map_value_has_spin_lock(map)) {
> > verbose(env, "tracing progs cannot use bpf_spin_lock yet\n");
> > return -EINVAL;
> > }
> >
> > BPF_PROG_TYPE_LSM is not in this list.
>
> The verifier does not have any problem, it's just that the helpers are not
> exposed to LSM programs via bpf_lsm_func_proto.
>
> So all we need is:
>
> diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
> index 61f8cc52fd5b..93383df2140b 100644
> --- a/kernel/bpf/bpf_lsm.c
> +++ b/kernel/bpf/bpf_lsm.c
> @@ -63,6 +63,10 @@ bpf_lsm_func_proto(enum bpf_func_id func_id, const
> struct bpf_prog *prog)
> return &bpf_task_storage_get_proto;
> case BPF_FUNC_task_storage_delete:
> return &bpf_task_storage_delete_proto;
> + case BPF_FUNC_spin_lock:
> + return &bpf_spin_lock_proto;
> + case BPF_FUNC_spin_unlock:
> + return &bpf_spin_unlock_proto;
Ahh. Yes. That should do it. Right now I don't see concerns with safety
of the bpf_spin_lock in bpf_lsm progs.
next prev parent reply other threads:[~2020-11-04 1:57 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-03 15:31 [PATCH bpf-next v2 0/8] Implement task_local_storage KP Singh
2020-11-03 15:31 ` [PATCH bpf-next v2 1/8] bpf: Implement task local storage KP Singh
2020-11-03 23:47 ` Song Liu
2020-11-03 23:54 ` KP Singh
2020-11-03 15:31 ` [PATCH bpf-next v2 2/8] libbpf: Add support for " KP Singh
2020-11-03 19:28 ` Andrii Nakryiko
2020-11-03 20:28 ` KP Singh
2020-11-03 15:31 ` [PATCH bpf-next v2 3/8] bpftool: " KP Singh
2020-11-03 23:50 ` Song Liu
2020-11-03 15:31 ` [PATCH bpf-next v2 4/8] bpf: Implement get_current_task_btf and RET_PTR_TO_BTF_ID KP Singh
2020-11-03 23:57 ` Song Liu
2020-11-03 15:31 ` [PATCH bpf-next v2 5/8] bpf: Fix tests for local_storage KP Singh
2020-11-04 0:16 ` Song Liu
2020-11-03 15:31 ` [PATCH bpf-next v2 6/8] bpf: Update selftests for local_storage to use vmlinux.h KP Singh
2020-11-04 0:16 ` Song Liu
2020-11-03 15:31 ` [PATCH bpf-next v2 7/8] bpf: Add tests for task_local_storage KP Singh
2020-11-03 18:47 ` Alexei Starovoitov
2020-11-03 18:59 ` KP Singh
2020-11-04 0:05 ` KP Singh
2020-11-04 1:27 ` Alexei Starovoitov
2020-11-04 1:55 ` KP Singh
2020-11-04 1:57 ` Alexei Starovoitov [this message]
2020-11-04 6:51 ` John Fastabend
2020-11-04 11:03 ` KP Singh
2020-11-04 11:11 ` KP Singh
2020-11-03 15:31 ` [PATCH bpf-next v2 8/8] bpf: Exercise syscall operations for inode and sk storage KP Singh
2020-11-03 22:32 ` Song Liu
2020-11-03 22:58 ` KP Singh
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