From patchwork Thu Jul 28 13:49:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Namjae Jeon X-Patchwork-Id: 12931314 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24BE7C04A68 for ; Thu, 28 Jul 2022 13:50:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229670AbiG1NuJ (ORCPT ); Thu, 28 Jul 2022 09:50:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54208 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230245AbiG1NuI (ORCPT ); Thu, 28 Jul 2022 09:50:08 -0400 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4572362A4C; Thu, 28 Jul 2022 06:50:05 -0700 (PDT) Received: by mail-pl1-f180.google.com with SMTP id p8so1829826plq.13; Thu, 28 Jul 2022 06:50:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=SL/nc3prOfupn2LlYJAxiJmSvJuuaV2EvEDV9LdRlv8=; b=EyO0i2rJlkDcp5LlCksbZ82NhZEvnfcrVu5YRYW/D5HIzQLcvHuCzkIXlVuuZnyvI4 TTuTS4zNpHP4t/FPxjiRFPyGHNsfPTHY+z1LTwzPisI+wUA6ZN3yEDf6PKULEb/USbb+ kYLqCPBG1L0gO8CRW7tQc20wTnr8FxhD8GagHtFIs5SuQvEBAxwI8Y0xj5rgHJntHr2N 36aMBGXj5tJtyzRvdHjB9b36VV4LmQSzKu+Fxmyt4MYu6xTGFFUZ/vPdGIP94OTOcNkD Z8q0fIIYsWw2mYSZmJSvFe0O6wNb6CD5nTJID0Hh2sXAyv9xu0DgWoZDB6/DG/pZrN5b fbPQ== X-Gm-Message-State: AJIora+9VcbfoxqiU5lyZ0GqCXibv+3HWsaAE0Lofxl6GnuWlgrpdGxq xzMrcX+ofIsIjhFTBd4UCQXY2weBuQI= X-Google-Smtp-Source: AGRyM1vByUyJ+pDdwKe4yZ9tNgPpiCJO3P1mBTmhVX9IgtxqHGLI9FgWdDN/ZkamwMxvzo6oTnkphQ== X-Received: by 2002:a17:90b:3148:b0:1f2:4651:255c with SMTP id ip8-20020a17090b314800b001f24651255cmr10279436pjb.18.1659016204129; Thu, 28 Jul 2022 06:50:04 -0700 (PDT) Received: from localhost.localdomain ([211.49.23.9]) by smtp.gmail.com with ESMTPSA id q8-20020a170902eb8800b0016cf985c0fcsm491712plg.124.2022.07.28.06.50.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jul 2022 06:50:03 -0700 (PDT) From: Namjae Jeon To: linux-cifs@vger.kernel.org Cc: smfrench@gmail.com, hyc.lee@gmail.com, senozhatsky@chromium.org, gregkh@linuxfoundation.org, Namjae Jeon , stable@vger.kernel.org, zdi-disclosures@trendmicro.com Subject: [PATCH v2 2/5] ksmbd: fix use-after-free bug in smb2_tree_disconect Date: Thu, 28 Jul 2022 22:49:43 +0900 Message-Id: <20220728134946.7603-2-linkinjeon@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220728134946.7603-1-linkinjeon@kernel.org> References: <20220728134946.7603-1-linkinjeon@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org smb2_tree_disconnect() freed the struct ksmbd_tree_connect, but it left the dangling pointer. It can be accessed again under compound requests. This bug can lead an oops looking something link: [ 1685.468014 ] BUG: KASAN: use-after-free in ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468068 ] Read of size 4 at addr ffff888102172180 by task kworker/1:2/4807 ... [ 1685.468130 ] Call Trace: [ 1685.468132 ] [ 1685.468135 ] dump_stack_lvl+0x49/0x5f [ 1685.468141 ] print_report.cold+0x5e/0x5cf [ 1685.468145 ] ? ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468157 ] kasan_report+0xaa/0x120 [ 1685.468194 ] ? ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468206 ] __asan_report_load4_noabort+0x14/0x20 [ 1685.468210 ] ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468222 ] smb2_tree_disconnect+0x175/0x250 [ksmbd] [ 1685.468235 ] handle_ksmbd_work+0x30e/0x1020 [ksmbd] [ 1685.468247 ] process_one_work+0x778/0x11c0 [ 1685.468251 ] ? _raw_spin_lock_irq+0x8e/0xe0 [ 1685.468289 ] worker_thread+0x544/0x1180 [ 1685.468293 ] ? __cpuidle_text_end+0x4/0x4 [ 1685.468297 ] kthread+0x282/0x320 [ 1685.468301 ] ? process_one_work+0x11c0/0x11c0 [ 1685.468305 ] ? kthread_complete_and_exit+0x30/0x30 [ 1685.468309 ] ret_from_fork+0x1f/0x30 Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3") Cc: stable@vger.kernel.org Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-17816 Signed-off-by: Namjae Jeon Reviewed-by: Hyunchul Lee --- v2: - add missing fixes and stable tags. fs/ksmbd/smb2pdu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 41ef076af072..7ecb6d87ae3e 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -2057,6 +2057,7 @@ int smb2_tree_disconnect(struct ksmbd_work *work) ksmbd_close_tree_conn_fds(work); ksmbd_tree_conn_disconnect(sess, tcon); + work->tcon = NULL; return 0; }