From patchwork Mon Oct 24 11:31:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 8633 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp420884wru; Mon, 24 Oct 2022 05:19:04 -0700 (PDT) X-Google-Smtp-Source: AMsMyM67BmKvF5w2cpHvEmJQETNIk2jCpTV1lh0bItRzeYFc8hnSX3YmVBtvKa+qm+plDP8VYSIL X-Received: by 2002:a05:6402:518b:b0:45d:9a19:66d2 with SMTP id q11-20020a056402518b00b0045d9a1966d2mr29974358edd.43.1666613944281; Mon, 24 Oct 2022 05:19:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1666613944; cv=none; d=google.com; s=arc-20160816; b=RzxF3IdoHYSPetPSNDOSQD0KmcDS8uDInrwnXNNvgULQ1VIDnpJ/+e26ePvqosblMP YM5zgKtos69fpZXJ6G+5Vv6e1lYot8bONIBOOAnkzAbI0BIs7MqgjFALy/1hne/rBMCG EIfBB3jgT6DzRvG92pqZWCkqR40nVLk0LdfWzUiRPAVb9m3ZBuZh9BYoMS9kiuwuiXhA va/+16OjzgSWaZ2ZEH9XQlYgY79+lqV6aa8BQDdIHMuhWOMozjRY9SV2ChBujGP1eelU sYdih0iDYCWz3mDUS7EJtnJ+YaIRW6pEJrGrRI9yhJ7P2SKvXnu6uOHX5ktSlgt+WTcU kXVg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=Mza8c6hkNH81WXIqUNOMWUUn8XJ3uoJosevxGlu0+KE=; b=i7Nnxzbc9uZlaHAxT/qR+v2Q1nO/yHF1+PCOWFgYblROw8P9xvb8t1TZxEnrzERQI8 awYWazVvDKwKKbl6WUsI2LQLRIfQvm3cx0An3h/Kuyv1LDhTgyWt229WeMoJQzXMmP3S lx+afFyvkR6Zksk0AzA55t09Pv+e1zkHopp0gd6kpf6gCiBBDYZPlLtKpw7zTsxrUp/Z vit328GMLsm0XVUlWGldBjin9dYCXA7rkPhFH0nhSFMkvFZ8oKGVSI9Q/qo0qPuC89Pg vfG7uGtr6E3EwJAbsGLRVaBKox43oAMKyF2Caz6VAmu3wP7c6nUz9UActIaDLFLHKh0+ Hw+w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b="WCVYQ/hh"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id hg6-20020a1709072cc600b00791a41d1b39si17031478ejc.656.2022.10.24.05.18.39; Mon, 24 Oct 2022 05:19:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b="WCVYQ/hh"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232856AbiJXMM7 (ORCPT + 99 others); Mon, 24 Oct 2022 08:12:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232931AbiJXMMI (ORCPT ); Mon, 24 Oct 2022 08:12:08 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C2056C950; Mon, 24 Oct 2022 04:54:10 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7378C612D5; Mon, 24 Oct 2022 11:53:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86318C4314F; Mon, 24 Oct 2022 11:53:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666612391; bh=v1r82cymzQPnMWu7S3606OX3gKWmSJrP2gwD0jxVRvI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WCVYQ/hhDfDRXyKRqHpgVO/9ue5d8UmPtdS9f89ySMyxN7K7ZQGdNuKMYxwrkOjaB GUndFICgXm4kAga22FtfvK5TRRkrY1wF/+8qExX31kvhqGpwRYe+KaXrJvcbofLVd/ vNOjATXJxCzhez7q6Mv7lRCyM91IW2RoqBVzd/ZM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jakub Sitnicki , Liu Jian , Daniel Borkmann , John Fastabend , Eric Dumazet , Sasha Levin Subject: [PATCH 4.14 181/210] net: If sock is dead dont access socks sk_wq in sk_stream_wait_memory Date: Mon, 24 Oct 2022 13:31:38 +0200 Message-Id: <20221024113002.837817442@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024112956.797777597@linuxfoundation.org> References: <20221024112956.797777597@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747571383001994482?= X-GMAIL-MSGID: =?utf-8?q?1747571383001994482?= From: Liu Jian [ Upstream commit 3f8ef65af927db247418d4e1db49164d7a158fc5 ] Fixes the below NULL pointer dereference: [...] [ 14.471200] Call Trace: [ 14.471562] [ 14.471882] lock_acquire+0x245/0x2e0 [ 14.472416] ? remove_wait_queue+0x12/0x50 [ 14.473014] ? _raw_spin_lock_irqsave+0x17/0x50 [ 14.473681] _raw_spin_lock_irqsave+0x3d/0x50 [ 14.474318] ? remove_wait_queue+0x12/0x50 [ 14.474907] remove_wait_queue+0x12/0x50 [ 14.475480] sk_stream_wait_memory+0x20d/0x340 [ 14.476127] ? do_wait_intr_irq+0x80/0x80 [ 14.476704] do_tcp_sendpages+0x287/0x600 [ 14.477283] tcp_bpf_push+0xab/0x260 [ 14.477817] tcp_bpf_sendmsg_redir+0x297/0x500 [ 14.478461] ? __local_bh_enable_ip+0x77/0xe0 [ 14.479096] tcp_bpf_send_verdict+0x105/0x470 [ 14.479729] tcp_bpf_sendmsg+0x318/0x4f0 [ 14.480311] sock_sendmsg+0x2d/0x40 [ 14.480822] ____sys_sendmsg+0x1b4/0x1c0 [ 14.481390] ? copy_msghdr_from_user+0x62/0x80 [ 14.482048] ___sys_sendmsg+0x78/0xb0 [ 14.482580] ? vmf_insert_pfn_prot+0x91/0x150 [ 14.483215] ? __do_fault+0x2a/0x1a0 [ 14.483738] ? do_fault+0x15e/0x5d0 [ 14.484246] ? __handle_mm_fault+0x56b/0x1040 [ 14.484874] ? lock_is_held_type+0xdf/0x130 [ 14.485474] ? find_held_lock+0x2d/0x90 [ 14.486046] ? __sys_sendmsg+0x41/0x70 [ 14.486587] __sys_sendmsg+0x41/0x70 [ 14.487105] ? intel_pmu_drain_pebs_core+0x350/0x350 [ 14.487822] do_syscall_64+0x34/0x80 [ 14.488345] entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] The test scenario has the following flow: thread1 thread2 ----------- --------------- tcp_bpf_sendmsg tcp_bpf_send_verdict tcp_bpf_sendmsg_redir sock_close tcp_bpf_push_locked __sock_release tcp_bpf_push //inet_release do_tcp_sendpages sock->ops->release sk_stream_wait_memory // tcp_close sk_wait_event sk->sk_prot->close release_sock(__sk); *** lock_sock(sk); __tcp_close sock_orphan(sk) sk->sk_wq = NULL release_sock **** lock_sock(__sk); remove_wait_queue(sk_sleep(sk), &wait); sk_sleep(sk) //NULL pointer dereference &rcu_dereference_raw(sk->sk_wq)->wait While waiting for memory in thread1, the socket is released with its wait queue because thread2 has closed it. This caused by tcp_bpf_send_verdict didn't increase the f_count of psock->sk_redir->sk_socket->file in thread1. We should check if SOCK_DEAD flag is set on wakeup in sk_stream_wait_memory before accessing the wait queue. Suggested-by: Jakub Sitnicki Signed-off-by: Liu Jian Signed-off-by: Daniel Borkmann Acked-by: John Fastabend Cc: Eric Dumazet Link: https://lore.kernel.org/bpf/20220823133755.314697-2-liujian56@huawei.com Signed-off-by: Sasha Levin --- net/core/stream.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/core/stream.c b/net/core/stream.c index cbe52b169070..e5c6c9e5e0aa 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -159,7 +159,8 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p) *timeo_p = current_timeo; } out: - remove_wait_queue(sk_sleep(sk), &wait); + if (!sock_flag(sk, SOCK_DEAD)) + remove_wait_queue(sk_sleep(sk), &wait); return err; do_error: