From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43921) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fjxir-0004DT-Tz for qemu-devel@nongnu.org; Sun, 29 Jul 2018 22:15:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fjxio-0007go-Lq for qemu-devel@nongnu.org; Sun, 29 Jul 2018 22:15:45 -0400 Received: from indium.canonical.com ([91.189.90.7]:43974) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fjxio-0007gT-DA for qemu-devel@nongnu.org; Sun, 29 Jul 2018 22:15:42 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1fjxim-0005SO-BD for ; Mon, 30 Jul 2018 02:15:40 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 505522E8052 for ; Mon, 30 Jul 2018 02:15:40 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Mon, 30 Jul 2018 02:05:39 -0000 From: umarcor <1783362@bugs.launchpad.net> Reply-To: Bug 1783362 <1783362@bugs.launchpad.net> Sender: bounces@canonical.com References: <153244909751.11925.3364609945591086988.malonedeb@gac.canonical.com> Message-Id: <153291634076.16627.13000337932523048103.launchpad@wampee.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1783362] Re: qemu-user: mmap should return failure (MAP_FAILED, -1) instead of success (NULL, 0) when len==0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org ** Changed in: qemu Status: New =3D> In Progress ** Changed in: qemu (Ubuntu) Status: New =3D> In Progress -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1783362 Title: qemu-user: mmap should return failure (MAP_FAILED, -1) instead of success (NULL, 0) when len=3D=3D0 Status in QEMU: In Progress Status in qemu package in Ubuntu: In Progress Bug description: As shown in https://github.com/beehive- lab/mambo/issues/19#issuecomment-407420602, with len=3D=3D0 mmap returns success (NULL, 0) instead of failure (MAP_FAILED, -1) in a x86_64 host executing a ELF 64-bit LSB executable, ARM aarch64 binary. Steps to reproduce the bug: - (cross-)compile the attached source file: $ aarch64-linux-gnu-gcc -static -std=3Dgnu99 -lpthread test/mmap_qemu.c -o mmap_qemu - Execute in a x86_64 host with qemu-user and qemu-user-binfmt: $ ./mmap_qemu alloc: 0 MAP_FAILED: -1 errno: 0 mmap_qemu: test/mmap_qemu.c:15: main: Assertion `alloc =3D=3D MAP_FAILED'= failed. qemu: uncaught target signal 6 (Aborted) - core dumped Aborted (core dumped) - Execute in a ARM host without any additional dependecy: $ ./mmap_qemu alloc: -1 MAP_FAILED: -1 errno: 22 The bug is present in Fedora: $ qemu-aarch64 --version qemu-aarch64 version 2.11.2(qemu-2.11.2-1.fc28) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers $ uname -r 4.17.7-200.fc28.x86_64 And also in Ubuntu: $ qemu-aarch64 --version qemu-aarch64 version 2.12.0 (Debian 1:2.12+dfsg-3ubuntu3) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers $ uname -r 4.15.0-23-generic Possibly related to: - https://lists.freebsd.org/pipermail/freebsd-hackers/2009-July/029109.ht= ml - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D203852 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1783362/+subscriptions