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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: KP Singh <kpsingh@chromium.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
	Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH v5 bpf-next 2/5] bpf: Introduce sleepable BPF programs
Date: Wed, 1 Jul 2020 08:21:13 -0700
Message-ID: <CAADnVQLoVfPWNBR-_56ofgaUFv8k3NT2aiGjV9jj_gOt0aoJ5g@mail.gmail.com> (raw)
In-Reply-To: <5596445c-7474-9913-6765-5d699c6c5c4e@iogearbox.net>

On Wed, Jul 1, 2020 at 2:34 AM Daniel Borkmann <daniel@iogearbox.net> wrote:
> +1, I think augmenting mid-term would be the best given check_sleepable_blacklist()
> is rather a very fragile workaround^hack and it's also a generic lsm/sec hooks issue

I tried to make that crystal clear back in march during bpf virtual conference.
imo whitelist is just as fragile as blacklist. Underlying
implementation can change.

> (at least for BPF_PROG_TYPE_LSM type & for the sake of documenting it for other LSMs).
> Perhaps there are function attributes that could be used and later retrieved via BTF?

Even if we convince gcc folks to add another function attribute it
won't appear in dwarf.
So we won't be able to convert it to BTF in pahole.
Looking at how we failed to extend address_space() attribute to
support existing __rcu
and __user annotations I don't have high hopes of achieving annotations
via compiler (either gcc or clang). So plan B is to engage with sparse folks and
make it emit BTF with __rcu, __user and other annotations.

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30  4:33 [PATCH v5 bpf-next 0/5] bpf: Introduce minimal support for sleepable progs Alexei Starovoitov
2020-06-30  4:33 ` [PATCH v5 bpf-next 1/5] bpf: Remove redundant synchronize_rcu Alexei Starovoitov
2020-06-30 20:55   ` Paul E. McKenney
2020-06-30  4:33 ` [PATCH v5 bpf-next 2/5] bpf: Introduce sleepable BPF programs Alexei Starovoitov
2020-06-30 22:04   ` Paul E. McKenney
2020-06-30 23:26   ` Daniel Borkmann
2020-06-30 23:41     ` Alexei Starovoitov
2020-07-01  9:15       ` KP Singh
2020-07-01  9:34         ` Daniel Borkmann
2020-07-01 15:21           ` Alexei Starovoitov [this message]
2020-07-10 17:00             ` Arnaldo Carvalho de Melo
2020-07-10 22:59               ` Alexei Starovoitov
2020-07-01  9:17       ` Daniel Borkmann
2020-07-01 15:14         ` Alexei Starovoitov
2020-07-01 19:03           ` KP Singh
2020-06-30  4:33 ` [PATCH v5 bpf-next 3/5] bpf: Add bpf_copy_from_user() helper Alexei Starovoitov
2020-06-30 11:41   ` KP Singh
2020-06-30  4:33 ` [PATCH v5 bpf-next 4/5] libbpf: support sleepable progs Alexei Starovoitov
2020-06-30  4:33 ` [PATCH v5 bpf-next 5/5] selftests/bpf: Add sleepable tests Alexei Starovoitov
2020-06-30  5:14 ` [PATCH v5 bpf-next 0/5] bpf: Introduce minimal support for sleepable progs Andrii Nakryiko

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