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Thu, 23 Jul 2020 03:40:05 +0000 From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH 00/12] Add a General Virtual Device Fuzzer Date: Wed, 22 Jul 2020 23:39:21 -0400 Message-Id: <20200723033933.21883-1-alxndr@bu.edu> X-Mailer: git-send-email 2.27.0 X-ClientProxiedBy: MN2PR16CA0057.namprd16.prod.outlook.com (2603:10b6:208:234::26) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mozz.bu.edu (128.197.127.33) by MN2PR16CA0057.namprd16.prod.outlook.com (2603:10b6:208:234::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3216.23 via Frontend Transport; Thu, 23 Jul 2020 03:40:03 +0000 X-Mailer: git-send-email 2.27.0 X-Originating-IP: [128.197.127.33] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 244eaef3-600e-4b51-955f-08d82eba162a X-MS-TrafficTypeDiagnostic: SN6PR03MB3982: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; 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envelope-from=alxndr@bu.edu; helo=NAM04-CO1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/22 23:55:10 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, Alexander Bulekov , f4bug@amsat.org, darren.kenny@oracle.com, bsd@redhat.com, dstepanov.src@gmail.com, stefanha@redhat.com, andrew@coatesdev.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is a general virtual-device fuzzer, designed to fuzz devices over Port IO, MMIO, and DMA. To get started with this: 1. Build the fuzzers (see docs/devel/fuzzing.txt) Note: Build with --enable-sanitizers, or create a "dictionary file": echo kw1=\"\x84\x05\x5C\x5E\" > dict and pass it as an argument to libFuzzer with -dict=./dict This magic value is a command separator that lets the fuzzer perform multiple IO actions with a single input. 2. Pick the qemu arguments you wish to fuzz: export QEMU_FUZZ_ARGS="-M q35 -device virtio-balloon" 3. Tell the fuzzer which QOM objects or MemoryRegion names to fuzz. I find the "info qom-tree", "info qtree" and "info mtree" commands useful for identifying these. Supports globbing. Here I will try to simultaneously fuzz(for no good reason) virtio-balloon and e1000e, which is included by default in the q35: export QEMU_FUZZ_OBJECTS='virtio* e1000*' You can also try to fuzz the whole machine: export QEMU_FUZZ_OBJECTS='*' 4. Run the fuzzer for 0 inputs. The fuzzer should output a list of MemoryRegions/PCI Devices it will try to fuzz. Confirm that these match your expectations. ./i386-softmmu/qemu-fuzz-i386 --fuzz-target=general-fuzz -runs=0 5. Run the fuzzer: ./i386-softmmu/qemu-fuzz-i386 --fuzz-target=general-fuzz Basically, at the core, this fuzzer is an interpreter that splits the input into a series of commands, such as mmio_write, pio_write, etc. We structure these commands to hit only MemoryRegions that are associated with the devices specified in QEMU_FUZZ_OBJECTS. Additionally, these patches add "hooks" to functions that are typically used by virtual-devices to read from RAM (DMA). These hooks attempt to populate these DMA regions with fuzzed data, just in time. Patch 1 changes the way we tell QTest to log to stderr (becomes important when building reproducers with this fuzzer) Patches 2-6 add the fuzzer and the necessary DMA callbacks Patches 7-10 are my (very rough) attempt at integrating this into OSS-Fuzz Patches 11-12 contain the "reordering" and minimization scripts used to produce a QTest reproducer for a crash. Additional notes: * With the latest changes, the fuzzer is quite effective at only targeting the device we care about, so it will probably be beneficial to allow reboot() as an option for resetting state, rather than fork(), for devices where that works well. * We have only scratched the surface for device "backends". I.e. I am using fake null-co:// drives for block devices and SLiRP for network devices (see scripts/oss-fuzz/general_fuzzer_configs.yml). Using more complex backends will likely break due to forking/threading/statefulness related reasons and will require more work. * Because I still can't figure out how to make QOS do what I want, this only maps PCI BARs on i386. For other targets, the fuzzer can still try to do it on its own :). Only did a very simple test on ppc and arm * This is failing on GitLab due to a leak: https://gitlab.com/a1xndr/qemu/-/jobs/652179729 I am not sure how to work around it yet, since I don't think we can free what the trace says we should free (argv from wordexp that we pass to qemu_main). Some of the issues I have found or reproduced with this fuzzer: https://bugs.launchpad.net/bugs/1525123 https://bugs.launchpad.net/bugs/1681439 https://bugs.launchpad.net/bugs/1777315 https://bugs.launchpad.net/bugs/1878034 https://bugs.launchpad.net/bugs/1878043 https://bugs.launchpad.net/bugs/1878054 https://bugs.launchpad.net/bugs/1878057 https://bugs.launchpad.net/bugs/1878067 https://bugs.launchpad.net/bugs/1878134 https://bugs.launchpad.net/bugs/1878136 https://bugs.launchpad.net/bugs/1878253 https://bugs.launchpad.net/bugs/1878255 https://bugs.launchpad.net/bugs/1878259 https://bugs.launchpad.net/bugs/1878263 https://bugs.launchpad.net/bugs/1878323 https://bugs.launchpad.net/bugs/1878641 https://bugs.launchpad.net/bugs/1878642 https://bugs.launchpad.net/bugs/1878645 https://bugs.launchpad.net/bugs/1878651 https://bugs.launchpad.net/bugs/1879223 https://bugs.launchpad.net/bugs/1879227 https://bugs.launchpad.net/bugs/1879531 https://bugs.launchpad.net/bugs/1880355 https://bugs.launchpad.net/bugs/1880539 https://bugs.launchpad.net/bugs/1884693 https://bugs.launchpad.net/bugs/1886362 https://bugs.launchpad.net/bugs/1887303 https://bugs.launchpad.net/bugs/1887309 https://bugs.launchpad.net/bugs/697510 -Alex Alexander Bulekov (12): fuzz: Change the way we write qtest log to stderr fuzz: Add general virtual-device fuzzer fuzz: Add PCI features to the general fuzzer fuzz: Add DMA support to the generic-fuzzer fuzz: Declare DMA Read callback function fuzz: Add fuzzer callbacks to DMA-read functions scripts/oss-fuzz: Add wrapper program for generic fuzzer scripts/oss-fuzz: Add general-fuzzer build script scripts/oss-fuzz: Add general-fuzzer configs for oss-fuzz scripts/oss-fuzz: build the general-fuzzer configs scripts/oss-fuzz: Add script to reorder a general-fuzzer trace scripts/oss-fuzz: Add crash trace minimization script exec.c | 2 + include/exec/memory.h | 16 + include/exec/memory_ldst_cached.inc.h | 3 + memory_ldst.inc.c | 4 + scripts/oss-fuzz/build.sh | 8 +- scripts/oss-fuzz/build_general_fuzzers.py | 62 ++ scripts/oss-fuzz/general_fuzzer_configs.yml | 103 +++ scripts/oss-fuzz/minimize_qtest_trace.py | 117 +++ .../oss-fuzz/reorder_fuzzer_qtest_trace.py | 94 +++ scripts/oss-fuzz/target.c | 40 + softmmu/memory.c | 14 + tests/qtest/fuzz/Makefile.include | 1 + tests/qtest/fuzz/fuzz.c | 5 +- tests/qtest/fuzz/general_fuzz.c | 758 ++++++++++++++++++ 14 files changed, 1223 insertions(+), 4 deletions(-) create mode 100755 scripts/oss-fuzz/build_general_fuzzers.py create mode 100644 scripts/oss-fuzz/general_fuzzer_configs.yml create mode 100755 scripts/oss-fuzz/minimize_qtest_trace.py create mode 100755 scripts/oss-fuzz/reorder_fuzzer_qtest_trace.py create mode 100644 scripts/oss-fuzz/target.c create mode 100644 tests/qtest/fuzz/general_fuzz.c