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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 22A50C433E0 for ; Sat, 11 Jul 2020 02:36:25 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EC83B206D9 for ; Sat, 11 Jul 2020 02:36:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EC83B206D9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52382 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ju5NI-0001QW-74 for qemu-devel@archiver.kernel.org; Fri, 10 Jul 2020 22:36:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46632) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ju5MW-0000vT-3M for qemu-devel@nongnu.org; Fri, 10 Jul 2020 22:35:36 -0400 Received: from indium.canonical.com ([91.189.90.7]:38176) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ju5MU-0005JZ-7k for qemu-devel@nongnu.org; Fri, 10 Jul 2020 22:35:35 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1ju5MS-0002KF-2n for ; Sat, 11 Jul 2020 02:35:32 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 0BA7C2E8025 for ; Sat, 11 Jul 2020 02:35:32 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sat, 11 Jul 2020 02:27:45 -0000 From: Alexander Bulekov <1880539@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: a1xndr philmd X-Launchpad-Bug-Reporter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9_=28philmd?= =?utf-8?q?=29?= X-Launchpad-Bug-Modifier: Alexander Bulekov (a1xndr) References: <159039895924.7312.8999076686824323072.malonedeb@gac.canonical.com> Message-Id: <159443446527.13251.15549023390424273703.malone@gac.canonical.com> Subject: [Bug 1880539] Re: I/O write make QXL abort in qxl_set_mode() X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="4809fcb62f445aaa3ae919f7f6c3cc7d156ea57a"; Instance="production-secrets-lazr.conf" X-Launchpad-Hash: 7cfa17f55f67c7c183de8a777f07f82f57f8d9e6 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/10 22:35:32 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -58 X-Spam_score: -5.9 X-Spam_bar: ----- X-Spam_report: (-5.9 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1880539 <1880539@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Here's a qtest reproducer for this: cat << EOF | ./i386-softmmu/qemu-system-i386 -M q35,accel=3Dqtest -qtest nu= ll -nographic -vga qxl -qtest stdio -nodefaults outl 0xcf8 0x80000804 outb 0xcfc 0xff outl 0xcf8 0x80000819 outl 0xcfc 0x87caff7a outb 0x86 0x23 EOF -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1880539 Title: I/O write make QXL abort in qxl_set_mode() Status in QEMU: New Bug description: libFuzzer found: qxl-0: guest bug: qxl_add_memslot: guest_start > guest_end 0xffffffffffff= ffff > 0x3ffffff qemu-fuzz-i386: hw/display/qxl.c:1611: void qxl_set_mode(PCIQXLDevice *, = unsigned int, int): Assertion `qxl_add_memslot(d, 0, devmem, QXL_SYNC) =3D= =3D 0' failed. =3D=3D8134=3D=3D ERROR: libFuzzer: deadly signal #0 0x55fddfcfb3f0 in __sanitizer_print_stack_trace (qemu-fuzz-i386+0x= cb13f0) #1 0x55fddfc0a3e1 in fuzzer::PrintStackTrace() (qemu-fuzz-i386+0xbc03= e1) #2 0x55fddfbeac6f in fuzzer::Fuzzer::CrashCallback() (qemu-fuzz-i386+= 0xba0c6f) #3 0x55fddfbeacc3 in fuzzer::Fuzzer::StaticCrashSignalCallback() (qem= u-fuzz-i386+0xba0cc3) #4 0x7fd640644c6f (/lib64/libpthread.so.0+0x12c6f) #5 0x7fd640483e34 in __GI_raise (/lib64/libc.so.6+0x37e34) #6 0x7fd64046e894 in __GI_abort (/lib64/libc.so.6+0x22894) #7 0x7fd64046e768 in __assert_fail_base.cold (/lib64/libc.so.6+0x2276= 8) #8 0x7fd64047c565 in __GI___assert_fail (/lib64/libc.so.6+0x30565) #9 0x55fde08afd8b in qxl_set_mode (qemu-fuzz-i386+0x1865d8b) #10 0x55fde08b9602 in ioport_write (qemu-fuzz-i386+0x186f602) #11 0x55fddff170a7 in memory_region_write_accessor (qemu-fuzz-i386+0x= ecd0a7) #12 0x55fddff16c13 in access_with_adjusted_size (qemu-fuzz-i386+0xecc= c13) #13 0x55fddff157b4 in memory_region_dispatch_write (qemu-fuzz-i386+0x= ecb7b4) Can be reproduce doing "writeb 0x06 0x23" on QXL I/O (PCI BAR #3). Command line: 'qemu-system-i386 -display none -M pc -vga qxl' To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1880539/+subscriptions