From patchwork Mon Aug 24 08:30:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265052 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=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 07EBCC433DF for ; Mon, 24 Aug 2020 09:33:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D4F08206F0 for ; Mon, 24 Aug 2020 09:33:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598261603; bh=f75tl17vxQarEIOmbQCAPyjN44tFzQmDBYKWO4ULK34=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Kmd67O5bUscKIaUjmfzCQLoCE6YOQSWR1znxprSpgUCB/eQQXhmBwXUJxvaZ5P7U9 ifWm4pj3SDHpzp23mbq25WdUQ0Eqtu+QiL1h/rOErQCOqGNk1e3QVfNTJHnCabGfqY ge/+dYzjJxM0A4eIj38/GOw3EmRpMxBLdsP3Q6u8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728561AbgHXJdS (ORCPT ); Mon, 24 Aug 2020 05:33:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:52558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728661AbgHXItr (ORCPT ); Mon, 24 Aug 2020 04:49:47 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 425C02075B; Mon, 24 Aug 2020 08:49:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258986; bh=f75tl17vxQarEIOmbQCAPyjN44tFzQmDBYKWO4ULK34=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cw6H7NrDuXldc+a4TguUiUtyEP5UBwc3MCf9gpfiikW8O/Q7PzdWb7H4V1x41ugvD u9z3ZaLwbwPkuB58ch/pawMYK1l2cCZ0zreqBZWr/84EPymeZmOfKO+/yvHzWDpz9O CpvgHXJwhaQR8JsSwsaqOUUnAin6oWUy1L7IhCjg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christoph Hellwig , Sargun Dhillon , Jakub Kicinski , Christian Brauner , Kees Cook , Sasha Levin Subject: [PATCH 4.4 03/33] net/compat: Add missing sock updates for SCM_RIGHTS Date: Mon, 24 Aug 2020 10:30:59 +0200 Message-Id: <20200824082346.694200004@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082346.498653578@linuxfoundation.org> References: <20200824082346.498653578@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kees Cook [ Upstream commit d9539752d23283db4692384a634034f451261e29 ] Add missed sock updates to compat path via a new helper, which will be used more in coming patches. (The net/core/scm.c code is left as-is here to assist with -stable backports for the compat path.) Cc: Christoph Hellwig Cc: Sargun Dhillon Cc: Jakub Kicinski Cc: stable@vger.kernel.org Fixes: 48a87cc26c13 ("net: netprio: fd passed in SCM_RIGHTS datagram not set correctly") Fixes: d84295067fc7 ("net: net_cls: fd passed in SCM_RIGHTS datagram not set correctly") Acked-by: Christian Brauner Signed-off-by: Kees Cook Signed-off-by: Sasha Levin --- include/net/sock.h | 4 ++++ net/compat.c | 1 + net/core/sock.c | 21 +++++++++++++++++++++ 3 files changed, 26 insertions(+) diff --git a/include/net/sock.h b/include/net/sock.h index 426a57874964c..31198b32d9122 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -779,6 +779,8 @@ static inline int sk_memalloc_socks(void) { return static_key_false(&memalloc_socks); } + +void __receive_sock(struct file *file); #else static inline int sk_memalloc_socks(void) @@ -786,6 +788,8 @@ static inline int sk_memalloc_socks(void) return 0; } +static inline void __receive_sock(struct file *file) +{ } #endif static inline gfp_t sk_gfp_atomic(const struct sock *sk, gfp_t gfp_mask) diff --git a/net/compat.c b/net/compat.c index d676840104556..20c5e5f215f23 100644 --- a/net/compat.c +++ b/net/compat.c @@ -284,6 +284,7 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) break; } /* Bump the usage count and install the file. */ + __receive_sock(fp[i]); fd_install(new_fd, get_file(fp[i])); } diff --git a/net/core/sock.c b/net/core/sock.c index 120d5058d81ae..82f9a7dbea6fe 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2275,6 +2275,27 @@ int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct * } EXPORT_SYMBOL(sock_no_mmap); +/* + * When a file is received (via SCM_RIGHTS, etc), we must bump the + * various sock-based usage counts. + */ +void __receive_sock(struct file *file) +{ + struct socket *sock; + int error; + + /* + * The resulting value of "error" is ignored here since we only + * need to take action when the file is a socket and testing + * "sock" for NULL is sufficient. + */ + sock = sock_from_file(file, &error); + if (sock) { + sock_update_netprioidx(sock->sk); + sock_update_classid(sock->sk); + } +} + ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) { ssize_t res;