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=-12.8 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,URIBL_BLOCKED, 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 866F1C433DF for ; Thu, 20 Aug 2020 11:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 64B37207BB for ; Thu, 20 Aug 2020 11:50:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597924205; bh=Ifi+U0M3vtDLC2ec3MipYlePFRuzZz26LhGzHccg604=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=p4CuDryBjdQVqVzDR2GZzT32GvmffgPcbBATFkRDMo4IPxbRbJS/ZRujlCmjhz4eh Q7/ZbjjBFBNU93D1MRHHIYqZOyn5/1WRj1FQynpm95DPlcBo3urxJt7p1UEdHdNK+A /k18tuMZDZ3R/8w9+oCXA+H6J466WESq3zFyTVyw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731000AbgHTLuB (ORCPT ); Thu, 20 Aug 2020 07:50:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:56020 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730347AbgHTKD3 (ORCPT ); Thu, 20 Aug 2020 06:03:29 -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 3DF2722B40; Thu, 20 Aug 2020 10:03:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917808; bh=Ifi+U0M3vtDLC2ec3MipYlePFRuzZz26LhGzHccg604=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=02Ec2fjT6QMva6RPwm0fqXGdZ9KjT1F3PH+72JHEmlY8aVmJn+ELkpywIjGDAKcDu Eo/xjgOwFN6FgTa6wbTaf5SZFBqcwOgskiz8ZTZE7zaRCMx1OV99nI8qitJLMmfZsY LHRb7sPHCBgnnRNKSkhM4+ChZGO+sR7zaJJTgTGs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+a22c6092d003d6fe1122@syzkaller.appspotmail.com, Dan Carpenter , Casey Schaufler , Sasha Levin Subject: [PATCH 4.9 135/212] Smack: fix another vsscanf out of bounds Date: Thu, 20 Aug 2020 11:21:48 +0200 Message-Id: <20200820091609.171859608@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Carpenter [ Upstream commit a6bd4f6d9b07452b0b19842044a6c3ea384b0b88 ] This is similar to commit 84e99e58e8d1 ("Smack: slab-out-of-bounds in vsscanf") where we added a bounds check on "rule". Reported-by: syzbot+a22c6092d003d6fe1122@syzkaller.appspotmail.com Fixes: f7112e6c9abf ("Smack: allow for significantly longer Smack labels v4") Signed-off-by: Dan Carpenter Signed-off-by: Casey Schaufler Signed-off-by: Sasha Levin --- security/smack/smackfs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 2bfec47b8d5c5..2eba7c1e66630 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -928,6 +928,10 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf, for (i = 0; i < catlen; i++) { rule += SMK_DIGITLEN; + if (rule > data + count) { + rc = -EOVERFLOW; + goto out; + } ret = sscanf(rule, "%u", &cat); if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) goto out; -- 2.25.1