linux-kernel - RE: [PATCH v3 8/9] io_uring/cmd: BPF hook for getsockopt cmd

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Message-ID: <687cf089ecc5451d9e398d71c9e171f0@AcuMS.aculab.com>
Date:   Tue, 22 Aug 2023 13:50:45 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Breno Leitao' <leitao@...ian.org>,
        Gabriel Krisman Bertazi <krisman@...e.de>
CC:     "sdf@...gle.com" <sdf@...gle.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "asml.silence@...il.com" <asml.silence@...il.com>,
        "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>,
        "martin.lau@...ux.dev" <martin.lau@...ux.dev>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
Subject: RE: [PATCH v3 8/9] io_uring/cmd: BPF hook for getsockopt cmd

...
> Not really, sock->ops->getsockopt() does not suport sockptr_t, but
> __user addresses, differently from setsockopt()
> 
...
>           int             (*getsockopt)(struct socket *sock, int level,
>                                         int optname, char __user *optval, int __user *optlen);
> 
> In order to be able to call sock->ops->getsockopt(), the callback
> function will need to accepted sockptr.

It is also worth looking at whether 'optlen' can be passed in
as a numeric parameter and then returned on success.
That would move the user copy into the syscall wrapper.

	David

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