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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: "David S. Miller" <davem@davemloft.net>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Network Development <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 08:14:41 -0700
Message-ID: <CAADnVQKF4z1kGduHdoRdNqmFQSoQ+b9skyb7n23YQj7X0qx8TA@mail.gmail.com> (raw)
In-Reply-To: <1e9d88c9-c5f2-6def-7afc-aca47a88f4b0@iogearbox.net>

On Wed, Jul 1, 2020 at 2:17 AM Daniel Borkmann <daniel@iogearbox.net> wrote:
> ("bpf: Replace cant_sleep() with cant_migrate()"). So perhaps one way to catch
> bugs for sleepable progs is to add a __might_sleep() into __bpf_prog_enter_sleepable()

that's a good idea.

> in order to trigger the assertion generally for DEBUG_ATOMIC_SLEEP configured
> kernels when we're in non-sleepable sections? Still not perfect since the code
> needs to be exercised first but better than nothing at all.
>
> >> What about others like security_sock_rcv_skb() for example which could be
> >> bh_lock_sock()'ed (or, generally hooks running in softirq context)?
> >
> > ahh. it's in running in bh at that point? then it should be added to blacklist.
>
> Yep.

I'm assuming KP will take care of it soon.
If not I'll come back to this set some time in August.

In the meantime I've pushed patch 1 that removes redundant sync_rcu to bpf-next,
since it's independent and it benefits from being in the tree as much
as possible.

  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
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 [this message]
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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