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Wed, 2 Sep 2020 14:38:15 +0000 From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH 2/3] fuzz: Add support for custom fuzzing library Date: Wed, 2 Sep 2020 10:37:59 -0400 Message-Id: <20200902143800.124073-3-alxndr@bu.edu> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200902143800.124073-1-alxndr@bu.edu> References: <20200902143800.124073-1-alxndr@bu.edu> X-ClientProxiedBy: MN2PR20CA0065.namprd20.prod.outlook.com (2603:10b6:208:235::34) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from 255.255.255.255 (255.255.255.255) by MN2PR20CA0065.namprd20.prod.outlook.com (2603:10b6:208:235::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3348.15 via Frontend Transport; Wed, 2 Sep 2020 14:38:14 +0000 X-Mailer: git-send-email 2.28.0 X-Originating-IP: [72.93.72.163] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b492b3f3-6d5f-4149-fe04-08d84f4dd321 X-MS-TrafficTypeDiagnostic: SA0PR03MB5561: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; 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envelope-from=alxndr@bu.edu; helo=NAM12-BN8-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/02 10:38:13 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: 4 X-Spam_score: 0.4 X-Spam_bar: / X-Spam_report: (0.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.999, MSGID_FROM_MTA_HEADER=0.001, RCVD_ILLEGAL_IP=1.3, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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: Laurent Vivier , Thomas Huth , darren.kenny@oracle.com, Alexander Bulekov , bsd@redhat.com, stefanha@redhat.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On oss-fuzz, we must use the LIB_FUZZING_ENGINE and CFLAGS environment variables, rather than -fsanitize=fuzzer. With this change, when LIB_FUZZING_ENGINE is set, the --enable-fuzzing configure option will use that environment variable during the linking stage, rather than -fsanitize=fuzzer Signed-off-by: Alexander Bulekov --- configure | 12 ++++++++++-- tests/qtest/fuzz/meson.build | 4 ++-- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/configure b/configure index 6ecaff429b..4182a88e75 100755 --- a/configure +++ b/configure @@ -6165,7 +6165,7 @@ fi ########################################## # checks for fuzzer -if test "$fuzzing" = "yes" ; then +if test "$fuzzing" = "yes" && test -z "${LIB_FUZZING_ENGINE+xxx}"; then write_c_fuzzer_skeleton if compile_prog "$CPU_CFLAGS -Werror -fsanitize=fuzzer" ""; then have_fuzzer=yes @@ -7505,7 +7505,14 @@ if test "$have_mlockall" = "yes" ; then echo "HAVE_MLOCKALL=y" >> $config_host_mak fi if test "$fuzzing" = "yes" ; then - QEMU_CFLAGS="$QEMU_CFLAGS -fsanitize=fuzzer-no-link" + # If LIB_FUZZING_ENGINE is set, assume we are running on OSS-Fuzz, and the + # needed CFLAGS have already been provided + if test -z "${LIB_FUZZING_ENGINE+xxx}" ; then + QEMU_CFLAGS="$QEMU_CFLAGS -fsanitize=fuzzer-no-link" + FUZZ_LINK_COMMAND="-fsanitize=fuzzer" + else + FUZZ_LINK_COMMAND="$LIB_FUZZING_ENGINE" + fi fi if test "$plugins" = "yes" ; then @@ -7620,6 +7627,7 @@ fi if test "$fuzzing" != "no"; then echo "CONFIG_FUZZ=y" >> $config_host_mak fi +echo "FUZZ_LINK_COMMAND=$FUZZ_LINK_COMMAND" >> $config_host_mak if test "$edk2_blobs" = "yes" ; then echo "DECOMPRESS_EDK2_BLOBS=y" >> $config_host_mak diff --git a/tests/qtest/fuzz/meson.build b/tests/qtest/fuzz/meson.build index 3432c3e7c3..59a630802a 100644 --- a/tests/qtest/fuzz/meson.build +++ b/tests/qtest/fuzz/meson.build @@ -9,8 +9,8 @@ specific_fuzz_ss.add(when: 'CONFIG_VIRTIO_SCSI', if_true: files('virtio_scsi_fuz # unfortunately declare_dependency does not support link_depends, so # this will be duplicated in meson.build fork_fuzz = declare_dependency( - link_args: ['-fsanitize=fuzzer', - '-Wl,-wrap,qtest_inb', + link_args: config_host['FUZZ_LINK_COMMAND'].split() + + ['-Wl,-wrap,qtest_inb', '-Wl,-wrap,qtest_inw', '-Wl,-wrap,qtest_inl', '-Wl,-wrap,qtest_outb', From patchwork Wed Sep 2 14:38:00 2020 Content-Type: text/plain; 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Wed, 2 Sep 2020 14:38:17 +0000 From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH 3/3] scripts/oss-fuzz/build.sh: fix rpath Date: Wed, 2 Sep 2020 10:38:00 -0400 Message-Id: <20200902143800.124073-4-alxndr@bu.edu> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200902143800.124073-1-alxndr@bu.edu> References: <20200902143800.124073-1-alxndr@bu.edu> X-ClientProxiedBy: MN2PR20CA0065.namprd20.prod.outlook.com (2603:10b6:208:235::34) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from 255.255.255.255 (255.255.255.255) by MN2PR20CA0065.namprd20.prod.outlook.com (2603:10b6:208:235::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3348.15 via Frontend Transport; Wed, 2 Sep 2020 14:38:15 +0000 X-Mailer: git-send-email 2.28.0 X-Originating-IP: [72.93.72.163] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 55eae1d5-1a13-47aa-c7a4-08d84f4dd402 X-MS-TrafficTypeDiagnostic: SA0PR03MB5561: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6108; 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envelope-from=alxndr@bu.edu; helo=NAM12-BN8-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/02 10:38:13 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: 4 X-Spam_score: 0.4 X-Spam_bar: / X-Spam_report: (0.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.999, MSGID_FROM_MTA_HEADER=0.001, RCVD_ILLEGAL_IP=1.3, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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: Thomas Huth , darren.kenny@oracle.com, Alexander Bulekov , bsd@redhat.com, stefanha@redhat.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Prior to this change, readelf -d build/out/qemu/qemu-fuzz-i386-target-virtio-net-slirp ... 0x000000000000000f (RPATH) Library rpath: ['$$ORIGIN/lib':$ORIGIN/migration:$ORIGIN/] As of 1a4db552d8 ("ninjatool: quote dollars in variables"), we don't need to manually double the dollars. Also, remove the single-quotes as they are copied into the rpath. After this change: 0x000000000000000f (RPATH) Library rpath: [$ORIGIN/lib:$ORIGIN/migration:$ORIGIN/] Signed-off-by: Alexander Bulekov --- scripts/oss-fuzz/build.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/oss-fuzz/build.sh b/scripts/oss-fuzz/build.sh index f0b7442c96..d16207eb67 100755 --- a/scripts/oss-fuzz/build.sh +++ b/scripts/oss-fuzz/build.sh @@ -81,7 +81,7 @@ rm qemu-fuzz-i386 # Build a second time to build the final binary with correct rpath ../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \ --prefix="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \ - --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,'\$\$ORIGIN/lib'" \ + --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,\$ORIGIN/lib" \ --target-list="i386-softmmu" make "-j$(nproc)" qemu-fuzz-i386 V=1