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From: Willem de Bruijn <[email protected]>
To: Breno Leitao <[email protected]>,
	[email protected], [email protected], [email protected],
	[email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected]
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: <[email protected]> (raw)
In-Reply-To: <[email protected]>

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 <[email protected]>

  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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