linux-kernel - Re: [PATCH v7 04/11] net/socket: Break down __sys

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Date:   Thu, 19 Oct 2023 16:32:45 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Martin KaFai Lau <martin.lau@...ux.dev>,
        Breno Leitao <leitao@...ian.org>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, io-uring@...r.kernel.org,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        David Howells <dhowells@...hat.com>, sdf@...gle.com,
        asml.silence@...il.com, willemdebruijn.kernel@...il.com,
        kuba@...nel.org, pabeni@...hat.com, krisman@...e.de,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v7 04/11] net/socket: Break down __sys_getsockopt

On 10/19/23 2:37 PM, Martin KaFai Lau wrote:
> On 10/19/23 1:04?PM, Jens Axboe wrote:
>> On 10/19/23 1:12 PM, Martin KaFai Lau wrote:
>>> On 10/16/23 6:47?AM, Breno Leitao wrote:
>>>> diff --git a/net/socket.c b/net/socket.c
>>>> index 0087f8c071e7..f4c156a1987e 100644
>>>> --- a/net/socket.c
>>>> +++ b/net/socket.c
>>>> @@ -2350,6 +2350,42 @@ SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
>>>>    INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
>>>>                                 int optname));
>>>>    +int do_sock_getsockopt(struct socket *sock, bool compat, int level,
>>>> +               int optname, sockptr_t optval, sockptr_t optlen)
>>>> +{
>>>> +    int max_optlen __maybe_unused;
>>>> +    const struct proto_ops *ops;
>>>> +    int err;
>>>> +
>>>> +    err = security_socket_getsockopt(sock, level, optname);
>>>> +    if (err)
>>>> +        return err;
>>>> +
>>>> +    ops = READ_ONCE(sock->ops);
>>>> +    if (level == SOL_SOCKET) {
>>>> +        err = sk_getsockopt(sock->sk, level, optname, optval, optlen);
>>>> +    } else if (unlikely(!ops->getsockopt)) {
>>>> +        err = -EOPNOTSUPP;
>>>> +    } else {
>>>> +        if (WARN_ONCE(optval.is_kernel || optlen.is_kernel,
>>>> +                  "Invalid argument type"))
>>>> +            return -EOPNOTSUPP;
>>>> +
>>>> +        err = ops->getsockopt(sock, level, optname, optval.user,
>>>> +                      optlen.user);
>>>> +    }
>>>> +
>>>> +    if (!compat) {
>>>> +        max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
>>>
>>> The max_optlen was done before the above sk_getsockopt. The bpf CI cannot catch it because it cannot apply patch 5 cleanly. I ran the following out of the linux-block tree:
>>>
>>> $> ./test_progs -t sockopt_sk
>>> test_sockopt_sk:PASS:join_cgroup /sockopt_sk 0 nsec
>>> run_test:PASS:skel_load 0 nsec
>>> run_test:PASS:setsockopt_link 0 nsec
>>> run_test:PASS:getsockopt_link 0 nsec
>>> (/data/users/kafai/fb-kernel/linux/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c:111: errno: Operation not permitted) Failed to call getsockopt, ret=-1
>>> run_test:FAIL:getsetsockopt unexpected error: -1 (errno 1)
>>> #217     sockopt_sk:FAIL
>>
>> Does it work with this incremental? I can fold that in, will rebase
>> anyway to collect acks.
> 
> Yes, that should work.
> 
> Acked-by: Martin KaFai Lau <martin.lau@...nel.org>

Thanks Martin, I'll add that too.

-- 
Jens Axboe