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=-19.4 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 4E7E0C636C8 for ; Thu, 15 Jul 2021 19:22:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2750F613E0 for ; Thu, 15 Jul 2021 19:22:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245531AbhGOTYM (ORCPT ); Thu, 15 Jul 2021 15:24:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:45622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242437AbhGOTHZ (ORCPT ); Thu, 15 Jul 2021 15:07:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EEBC761403; Thu, 15 Jul 2021 19:03:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626375799; bh=fb8gOiQrEf7WMMt9bnuvLr3twVkQHK/nTUyeq/tbNNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SqIcS1ks2zMiEZixanyiic62fF4OZ12V7CJlu4CslPBaQ+eYRtT4sM77DSLdb029L Y/7gX7uNhFWMNMSqBI1fNC6wRqnv4Dv8IJUxQsNYVUq4MVP4FYXMWzqrL4Dm/mHajs 8dC/V5YPxzaae6xhrwVQCfxBZiUypgZyxw7LFeG8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot , Tetsuo Handa , Casey Schaufler Subject: [PATCH 5.12 240/242] smackfs: restrict bytes count in smk_set_cipso() Date: Thu, 15 Jul 2021 20:40:02 +0200 Message-Id: <20210715182635.102657808@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210715182551.731989182@linuxfoundation.org> References: <20210715182551.731989182@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: Tetsuo Handa commit 49ec114a6e62d8d320037ce71c1aaf9650b3cafd upstream. Oops, I failed to update subject line. >>From 07571157c91b98ce1a4aa70967531e64b78e8346 Mon Sep 17 00:00:00 2001 From: Tetsuo Handa Date: Mon, 12 Apr 2021 22:25:06 +0900 Subject: [PATCH 5.12 240/242] smackfs: restrict bytes count in smk_set_cipso() Commit 7ef4c19d245f3dc2 ("smackfs: restrict bytes count in smackfs write functions") missed that count > SMK_CIPSOMAX check applies to only format == SMK_FIXED24_FMT case. Reported-by: syzbot Signed-off-by: Tetsuo Handa Signed-off-by: Casey Schaufler Signed-off-by: Greg Kroah-Hartman --- security/smack/smackfs.c | 2 ++ 1 file changed, 2 insertions(+) --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -855,6 +855,8 @@ static ssize_t smk_set_cipso(struct file if (format == SMK_FIXED24_FMT && (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) return -EINVAL; + if (count > PAGE_SIZE) + return -EINVAL; data = memdup_user_nul(buf, count); if (IS_ERR(data))