From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 115496 invoked by alias); 16 Jun 2018 23:07:39 -0000 Mailing-List: contact elfutils-devel-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Post: List-Help: List-Subscribe: Sender: elfutils-devel-owner@sourceware.org Received: (qmail 115473 invoked by uid 89); 16 Jun 2018 23:07:37 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Checked: by ClamAV 0.99.4 on sourceware.org X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 spammy= X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on sourceware.org X-Spam-Level: X-HELO: gnu.wildebeest.org Received: from wildebeest.demon.nl (HELO gnu.wildebeest.org) (212.238.236.112) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Sat, 16 Jun 2018 23:07:37 +0000 Received: from tarox.wildebeest.org (tarox.wildebeest.org [172.31.17.39]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by gnu.wildebeest.org (Postfix) with ESMTPSA id 01612301470B for ; Sun, 17 Jun 2018 01:07:34 +0200 (CEST) Received: by tarox.wildebeest.org (Postfix, from userid 1000) id DE35840216B3; Sun, 17 Jun 2018 01:07:34 +0200 (CEST) Message-ID: <1529190454.12946.116.camel@klomp.org> Subject: Re: [PATCH] readelf: Check there are at least 4 bytes available for DWARF_FORM_block4. From: Mark Wielaard To: elfutils-devel@sourceware.org Date: Sat, 16 Jun 2018 23:07:00 -0000 In-Reply-To: <20180613232458.19286-1-mark@klomp.org> References: <20180613232458.19286-1-mark@klomp.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Evolution 3.22.6 (3.22.6-14.el7) Mime-Version: 1.0 X-Spam-Flag: NO X-IsSubscribed: yes X-SW-Source: 2018-q2/txt/msg00227.txt.bz2 On Thu, 2018-06-14 at 01:24 +0200, Mark Wielaard wrote: > Found by afl-fuzz. When printing a DWARF_FORM_block4 we checked there > were only 2 bytes available (copy/paste from DW_FORM_block2 right > before). Obviously we need at least 4 bytes to read the length of a > DW_FORM_block4. Pushed to master.