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From: Daniel Borkmann <daniel@iogearbox.net>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>, davem@davemloft.net
Cc: paulmck@kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org,
	kernel-team@fb.com
Subject: Re: [PATCH v5 bpf-next 2/5] bpf: Introduce sleepable BPF programs
Date: Wed, 1 Jul 2020 01:26:44 +0200
Message-ID: <d0c6b6a6-7b82-e620-8ced-8a1acfaf6f6d@iogearbox.net> (raw)
In-Reply-To: <20200630043343.53195-3-alexei.starovoitov@gmail.com>

On 6/30/20 6:33 AM, Alexei Starovoitov wrote:
[...]
>   
> +/* list of non-sleepable kernel functions that are otherwise
> + * available to attach by bpf_lsm or fmod_ret progs.
> + */
> +static int check_sleepable_blacklist(unsigned long addr)
> +{
> +#ifdef CONFIG_BPF_LSM
> +	if (addr == (long)bpf_lsm_task_free)
> +		return -EINVAL;
> +#endif
> +#ifdef CONFIG_SECURITY
> +	if (addr == (long)security_task_free)
> +		return -EINVAL;
> +#endif
> +	return 0;
> +}

Would be nice to have some sort of generic function annotation to describe
that code cannot sleep inside of it, and then filter based on that. Anyway,
is above from manual code inspection?

What about others like security_sock_rcv_skb() for example which could be
bh_lock_sock()'ed (or, generally hooks running in softirq context)?

  parent 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 [this message]
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
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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