From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Breno Leitao <leitao@debian.org>,
sdf@google.com, axboe@kernel.dk, asml.silence@gmail.com,
willemdebruijn.kernel@gmail.com
Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, io-uring@vger.kernel.org,
kuba@kernel.org, pabeni@redhat.com
Subject: RE: [PATCH v2 2/8] io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT
Date: Wed, 09 Aug 2023 09:21:04 -0400 [thread overview]
Message-ID: <64d392c0235c6_267bde294c3@willemb.c.googlers.com.notmuch> (raw)
In-Reply-To: <20230808134049.1407498-3-leitao@debian.org>
Breno Leitao wrote:
> Add support for getsockopt command (SOCKET_URING_OP_GETSOCKOPT), where
> level is SOL_SOCKET. This is leveraging the sockptr_t infrastructure,
> where a sockptr_t is either userspace or kernel space, and handled as
> such.
>
> Function io_uring_cmd_getsockopt() is inspired by __sys_getsockopt().
>
> Differently from the getsockopt(2), the optlen field is not a userspace
> pointers. In getsockopt(2), userspace provides optlen pointer, which is
> overwritten by the kernel. In this implementation, userspace passes a
> u32, and the new value is returned in cqe->res. I.e., optlen is not a
> pointer.
>
> Important to say that userspace needs to keep the pointer alive until
> the CQE is completed.
What bad things can happen otherwise?
The kernel is not depending on a well behaved process for its
correctness here, is it? Any user pages have to be pinned while
kernel might refer to them, for instance.
> Signed-off-by: Breno Leitao <leitao@debian.org>
next prev parent reply other threads:[~2023-08-09 13:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-08 13:40 [PATCH v2 0/8] io_uring: Initial support for {s,g}etsockopt commands Breno Leitao
2023-08-08 13:40 ` [PATCH v2 1/8] net: expose sock_use_custom_sol_socket Breno Leitao
2023-08-08 16:13 ` Hugo Villeneuve
2023-08-08 17:21 ` Breno Leitao
2023-08-08 17:46 ` Hugo Villeneuve
2023-08-09 9:39 ` Breno Leitao
2023-08-08 20:12 ` Jeff Moyer
2023-08-08 13:40 ` [PATCH v2 2/8] io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT Breno Leitao
2023-08-09 4:07 ` kernel test robot
2023-08-09 10:27 ` kernel test robot
2023-08-09 13:21 ` Willem de Bruijn [this message]
2023-08-10 12:57 ` Pavel Begunkov
2023-08-08 13:40 ` [PATCH v2 3/8] io_uring/cmd: Introduce SOCKET_URING_OP_SETSOCKOPT Breno Leitao
2023-08-09 6:01 ` kernel test robot
2023-08-09 11:09 ` kernel test robot
2023-08-08 13:40 ` [PATCH v2 4/8] io_uring/cmd: Extend support beyond SOL_SOCKET Breno Leitao
2023-08-09 16:32 ` Gabriel Krisman Bertazi
2023-08-08 13:40 ` [PATCH v2 5/8] bpf: Leverage sockptr_t in BPF getsockopt hook Breno Leitao
2023-08-08 13:40 ` [PATCH v2 6/8] bpf: Leverage sockptr_t in BPF setsockopt hook Breno Leitao
2023-08-08 13:40 ` [PATCH v2 7/8] io_uring/cmd: BPF hook for getsockopt cmd Breno Leitao
2023-08-09 4:17 ` kernel test robot
2023-08-09 16:46 ` Gabriel Krisman Bertazi
2023-08-10 8:26 ` Breno Leitao
2023-08-08 13:40 ` [PATCH v2 8/8] io_uring/cmd: BPF hook for setsockopt cmd Breno Leitao
2023-08-09 22:02 ` Martin KaFai Lau
2023-08-08 17:35 ` [PATCH v2 0/8] io_uring: Initial support for {s,g}etsockopt commands Stanislav Fomichev
2023-08-09 9:40 ` Breno Leitao
2023-08-09 16:26 ` Stanislav Fomichev
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