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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4601f2dcad5sm29110357f8f.5.2026.06.05.08.14.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2026 08:14:26 -0700 (PDT) Date: Fri, 5 Jun 2026 16:14:24 +0100 From: David Laight To: Breno Leitao Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Kuniyuki Iwashima , Willem de Bruijn , metze@samba.org, axboe@kernel.dk, Stanislav Fomichev , io-uring@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, Linus Torvalds , linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH net-next v3 0/4] net: move .getsockopt away from __user buffers (update 1) Message-ID: <20260605161424.334a05d5@pumpkin> In-Reply-To: References: <20260408-getsockopt-v3-0-061bb9cb355d@debian.org> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 5 Jun 2026 05:25:21 -0700 Breno Leitao wrote: > On Wed, Apr 08, 2026 at 03:30:28AM -0700, Breno Leitao wrote: > > Currently, the .getsockopt callback requires __user pointers: > > > > int (*getsockopt)(struct socket *sock, int level, > > int optname, char __user *optval, int __user *optlen); > > > > This prevents kernel callers (io_uring, BPF) from using getsockopt on > > levels other than SOL_SOCKET, since they pass kernel pointers. > > > > Following Linus' suggestion [0], this series introduces sockopt_t, a > > type-safe wrapper around iov_iter, I'd have thought it would also have been better to use a wrapper function instead of direct calls to copy_from_iter(). There is no need for most of the code to know there is a iov_iter hiding inside sockopt_t. -- David > > and a getsockopt_iter callback that > > works with both user and kernel buffers. AF_PACKET and CAN raw are > > converted as initial users, with selftests covering the trickiest > > conversion patterns. > > Quick update on this effort. > > All proto_ops users have been converted to getsockopt_iter and submitted. > > Most conversions are already in linux-next. Three remain: > > 1) rds: Under review > https://lore.kernel.org/all/20260605-getsock_more-v2-3-80f38cdb8706@debian.org/ > > 2) smc: Submitted today. This is only limited to UBUF right now > https://lore.kernel.org/all/20260605-getsockopt_smc-v1-1-65da62fa44c4@debian.org/ > > 3) CAN drivers: Reviewed and acked, pending Marc's merge > https://lore.kernel.org/all/f83e25e1-b9f5-4810-bbd6-fdb8d2a10c8e@hartkopp.net/ > > Once these are merged, I'll rename getsockopt_iter to getsockopt and > remove the legacy path. > > Next, I'll convert struct proto the same way to eliminate the remaining > userspace optlen/optval pointers. > > After that, io_uring getsockopt operations will be unblocked. >