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Thu, 23 Jul 2020 03:40:17 +0000 From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH 07/12] scripts/oss-fuzz: Add wrapper program for generic fuzzer Date: Wed, 22 Jul 2020 23:39:28 -0400 Message-Id: <20200723033933.21883-8-alxndr@bu.edu> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200723033933.21883-1-alxndr@bu.edu> References: <20200723033933.21883-1-alxndr@bu.edu> 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 03:40:15 +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: ead30c39-6fac-4fff-3b2a-08d82eba1d61 X-MS-TrafficTypeDiagnostic: SN6PR03MB3982: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:849; 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envelope-from=alxndr@bu.edu; helo=NAM12-MW2-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/22 23:40:15 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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, Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On oss-fuzz we need some sort of wrapper to specify command-line arguments or environment variables. When we had a similar problem with other targets that I fixed with 05509c8e6d ("fuzz: select fuzz target using executable name") by selecting the fuzz target based on the executable's name. In the future should probably commit to one approach (wrapper binary or argv0-based target selection). Signed-off-by: Alexander Bulekov --- scripts/oss-fuzz/target.c | 40 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 scripts/oss-fuzz/target.c diff --git a/scripts/oss-fuzz/target.c b/scripts/oss-fuzz/target.c new file mode 100644 index 0000000000..4a7257412a --- /dev/null +++ b/scripts/oss-fuzz/target.c @@ -0,0 +1,40 @@ +/* + * Copyright Red Hat Inc., 2020 + * + * Authors: + * Alexander Bulekov + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include +#include +#include +#include +#include +#include + + +/* Required for oss-fuzz to consider the binary a target. */ +static const char *magic __attribute__((used)) = "LLVMFuzzerTestOneInput"; +static const char args[] = {QEMU_FUZZ_ARGS, 0x00}; +static const char objects[] = {QEMU_FUZZ_OBJECTS, 0x00}; + +int main(int argc, char *argv[]) +{ + char path[PATH_MAX] = {0}; + char *dir = dirname(argv[0]); + strncpy(path, dir, PATH_MAX); + strcat(path, "/deps/qemu-fuzz-i386-target-general-fuzz"); + + setenv("QEMU_FUZZ_ARGS", args, 0); + setenv("QEMU_FUZZ_OBJECTS", objects, 0); + + argv[0] = path; + int ret = execvp(path, argv); + if (ret) { + perror("execv"); + } + return ret; +}