From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89192C4743C for ; Mon, 21 Jun 2021 16:28:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74CC161289 for ; Mon, 21 Jun 2021 16:28:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232178AbhFUQaQ (ORCPT ); Mon, 21 Jun 2021 12:30:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:49176 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231137AbhFUQ2Z (ORCPT ); Mon, 21 Jun 2021 12:28:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AE73461360; Mon, 21 Jun 2021 16:23:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1624292606; bh=91e13lMOwpYNY13RKtba1tRp3vBbx36wNlvkRJiK5l0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GIGButsCIkfWHp31iPOZLhKaJ6t60dQWKZRtij7YQyLy7EtREhS3ryWfPVafhly46 GDSdG9aDdkwBBWg8v1/G3lcGL1aoLnRxXlF4eG6xAOPdrLEzJdCti4Yox11THlGMn0 Vkd4FuX8nD063T2RXXLVa1ULqFOzPACc+4PRjVz8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Changbin Du , Cong Wang , Jakub Kicinski , David Laight , Christian Brauner , "David S. Miller" , Sasha Levin Subject: [PATCH 5.10 045/146] net: make get_net_ns return error if NET_NS is disabled Date: Mon, 21 Jun 2021 18:14:35 +0200 Message-Id: <20210621154912.823486108@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210621154911.244649123@linuxfoundation.org> References: <20210621154911.244649123@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Changbin Du [ Upstream commit ea6932d70e223e02fea3ae20a4feff05d7c1ea9a ] There is a panic in socket ioctl cmd SIOCGSKNS when NET_NS is not enabled. The reason is that nsfs tries to access ns->ops but the proc_ns_operations is not implemented in this case. [7.670023] Unable to handle kernel NULL pointer dereference at virtual address 00000010 [7.670268] pgd = 32b54000 [7.670544] [00000010] *pgd=00000000 [7.671861] Internal error: Oops: 5 [#1] SMP ARM [7.672315] Modules linked in: [7.672918] CPU: 0 PID: 1 Comm: systemd Not tainted 5.13.0-rc3-00375-g6799d4f2da49 #16 [7.673309] Hardware name: Generic DT based system [7.673642] PC is at nsfs_evict+0x24/0x30 [7.674486] LR is at clear_inode+0x20/0x9c The same to tun SIOCGSKNS command. To fix this problem, we make get_net_ns() return -EINVAL when NET_NS is disabled. Meanwhile move it to right place net/core/net_namespace.c. Signed-off-by: Changbin Du Fixes: c62cce2caee5 ("net: add an ioctl to get a socket network namespace") Cc: Cong Wang Cc: Jakub Kicinski Cc: David Laight Cc: Christian Brauner Suggested-by: Jakub Kicinski Acked-by: Christian Brauner Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- include/linux/socket.h | 2 -- include/net/net_namespace.h | 7 +++++++ net/core/net_namespace.c | 12 ++++++++++++ net/socket.c | 13 ------------- 4 files changed, 19 insertions(+), 15 deletions(-) diff --git a/include/linux/socket.h b/include/linux/socket.h index e9cb30d8cbfb..9aa530d497da 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -437,6 +437,4 @@ extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, extern int __sys_socketpair(int family, int type, int protocol, int __user *usockvec); extern int __sys_shutdown(int fd, int how); - -extern struct ns_common *get_net_ns(struct ns_common *ns); #endif /* _LINUX_SOCKET_H */ diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index 22bc07f4b043..eb0e7731f3b1 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -203,6 +203,8 @@ struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid); void net_ns_barrier(void); + +struct ns_common *get_net_ns(struct ns_common *ns); #else /* CONFIG_NET_NS */ #include #include @@ -222,6 +224,11 @@ static inline void net_ns_get_ownership(const struct net *net, } static inline void net_ns_barrier(void) {} + +static inline struct ns_common *get_net_ns(struct ns_common *ns) +{ + return ERR_PTR(-EINVAL); +} #endif /* CONFIG_NET_NS */ diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index dbc66b896287..5c9d95f30be6 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -650,6 +650,18 @@ void __put_net(struct net *net) } EXPORT_SYMBOL_GPL(__put_net); +/** + * get_net_ns - increment the refcount of the network namespace + * @ns: common namespace (net) + * + * Returns the net's common namespace. + */ +struct ns_common *get_net_ns(struct ns_common *ns) +{ + return &get_net(container_of(ns, struct net, ns))->ns; +} +EXPORT_SYMBOL_GPL(get_net_ns); + struct net *get_net_ns_by_fd(int fd) { struct file *file; diff --git a/net/socket.c b/net/socket.c index 6e6cccc2104f..002d5952ae5d 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1080,19 +1080,6 @@ static long sock_do_ioctl(struct net *net, struct socket *sock, * what to do with it - that's up to the protocol still. */ -/** - * get_net_ns - increment the refcount of the network namespace - * @ns: common namespace (net) - * - * Returns the net's common namespace. - */ - -struct ns_common *get_net_ns(struct ns_common *ns) -{ - return &get_net(container_of(ns, struct net, ns))->ns; -} -EXPORT_SYMBOL_GPL(get_net_ns); - static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) { struct socket *sock; -- 2.30.2