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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefano Garzarella , Shuah Khan , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-kselftest@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH net-next 1/3] netlink: convert to getsockopt_iter Message-ID: References: <20260501-getsock_one-v1-0-810ce23ea70e@debian.org> <20260501-getsock_one-v1-1-810ce23ea70e@debian.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260501-getsock_one-v1-1-810ce23ea70e@debian.org> On 05/01, Breno Leitao wrote: > Convert AF_NETLINK's getsockopt implementation to use the new > getsockopt_iter callback with sockopt_t. > > Key changes: > - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt > - Use opt->optlen for buffer length (input) and returned size (output) > - Use copy_to_iter() instead of put_user()/copy_to_user() > - For NETLINK_LIST_MEMBERSHIPS: walk the groups bitmap and emit each > u32 sequentially via copy_to_iter(), then set opt->optlen to the > total size required (ALIGN(BITS_TO_BYTES(ngroups), sizeof(u32))). > The wrapper writes opt->optlen back to userspace even on partial > failure, preserving the existing API that lets userspace discover > the needed allocation size. > > Signed-off-by: Breno Leitao Acked-by: Stanislav Fomichev