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Message-ID: <21dc6507-e1f5-a261-7a9c-7e0cb22e1fc7@linux.dev> Date: Thu, 19 Oct 2023 13:37:51 -0700 From: Martin KaFai Lau <martin.lau@...ux.dev> To: Jens Axboe <axboe@...nel.dk>, 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 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> > > > diff --git a/net/socket.c b/net/socket.c > index bccd257e13fe..eb6960958026 100644 > --- a/net/socket.c > +++ b/net/socket.c > @@ -2344,6 +2344,9 @@ int do_sock_getsockopt(struct socket *sock, bool compat, int level, > if (err) > return err; > > + if (!compat) > + max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); > + > ops = READ_ONCE(sock->ops); > if (level == SOL_SOCKET) { > err = sk_getsockopt(sock->sk, level, optname, optval, optlen); > @@ -2358,12 +2361,10 @@ int do_sock_getsockopt(struct socket *sock, bool compat, int level, > optlen.user); > } > > - if (!compat) { > - max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); > + if (!compat) > err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, > optval, optlen, max_optlen, > err); > - } > > return err; > } >
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