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=-20.2 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 B0B80C636CE for ; Mon, 19 Jul 2021 16:29:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92ADB61938 for ; Mon, 19 Jul 2021 16:29:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347646AbhGSPsZ (ORCPT ); Mon, 19 Jul 2021 11:48:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:58902 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345315AbhGSPAc (ORCPT ); Mon, 19 Jul 2021 11:00:32 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A99CB60238; Mon, 19 Jul 2021 15:41:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626709271; bh=FsPxri3gfRLtr9txcmOvhLNCaxYZiy2IXVIUQXOPk5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uIaJIJGtfrUvByChC6SZYriW6p90TyblMJs1LvLHrvkjOXIizyThWMMB2+TTN38hj JBHkHwkwrtM5Ys4rDJV2wqz6whjL1UgvrlzMsc2fYE8wlEPncj+rAzsrFMWL6YETiN 8bULYRvH8u2Q9GntG79Au6jAVG4SIQflbSs5hjUo= 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 4.19 316/421] smackfs: restrict bytes count in smk_set_cipso() Date: Mon, 19 Jul 2021 16:52:07 +0200 Message-Id: <20210719144957.265183240@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144946.310399455@linuxfoundation.org> References: <20210719144946.310399455@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 4.19 316/421] 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 @@ -883,6 +883,8 @@ 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))