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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.95.107; envelope-from=alxndr@bu.edu; helo=NAM02-DM3-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-0.001, SPF_HELO_NONE=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: Paolo Bonzini , Thomas Huth , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) From: Philippe Mathieu-Daud=C3=A9 This test fails when QEMU is built without the megasas device, restrict it to its availability. Signed-off-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Thomas Huth --- MAINTAINERS | 1 + tests/qtest/fuzz-megasas-test.c | 49 +++++++++++++++++++++++++++++++++ tests/qtest/fuzz-test.c | 25 ----------------- tests/qtest/meson.build | 4 ++- 4 files changed, 53 insertions(+), 26 deletions(-) create mode 100644 tests/qtest/fuzz-megasas-test.c diff --git a/MAINTAINERS b/MAINTAINERS index 5ca3c9f851..0f560d1b91 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1969,6 +1969,7 @@ S: Supported F: hw/scsi/megasas.c F: hw/scsi/mfi.h F: tests/qtest/megasas-test.c +F: tests/qtest/fuzz-megasas-test.c =20 Network packet abstractions M: Dmitry Fleytman diff --git a/tests/qtest/fuzz-megasas-test.c b/tests/qtest/fuzz-megasas-tes= t.c new file mode 100644 index 0000000000..940a76bf25 --- /dev/null +++ b/tests/qtest/fuzz-megasas-test.c @@ -0,0 +1,49 @@ +/* + * QTest fuzzer-generated testcase for megasas device + * + * Copyright (c) 2020 Li Qiang + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "libqos/libqtest.h" + +/* + * This used to trigger the assert in scsi_dma_complete + * https://bugs.launchpad.net/qemu/+bug/1878263 + */ +static void test_lp1878263_megasas_zero_iov_cnt(void) +{ + QTestState *s; + + s =3D qtest_init("-nographic -monitor none -serial none " + "-M q35 -device megasas -device scsi-cd,drive=3Dnull0 " + "-blockdev driver=3Dnull-co,read-zeroes=3Don,node-name= =3Dnull0"); + qtest_outl(s, 0xcf8, 0x80001818); + qtest_outl(s, 0xcfc, 0xc101); + qtest_outl(s, 0xcf8, 0x8000181c); + qtest_outl(s, 0xcf8, 0x80001804); + qtest_outw(s, 0xcfc, 0x7); + qtest_outl(s, 0xcf8, 0x8000186a); + qtest_writeb(s, 0x14, 0xfe); + qtest_writeb(s, 0x0, 0x02); + qtest_outb(s, 0xc1c0, 0x17); + qtest_quit(s); +} + +int main(int argc, char **argv) +{ + const char *arch =3D qtest_get_arch(); + + g_test_init(&argc, &argv, NULL); + + if (strcmp(arch, "i386") =3D=3D 0 || strcmp(arch, "x86_64") =3D=3D 0) { + qtest_add_func("fuzz/test_lp1878263_megasas_zero_iov_cnt", + test_lp1878263_megasas_zero_iov_cnt); + } + + return g_test_run(); +} diff --git a/tests/qtest/fuzz-test.c b/tests/qtest/fuzz-test.c index 6f161c93be..631feaf0eb 100644 --- a/tests/qtest/fuzz-test.c +++ b/tests/qtest/fuzz-test.c @@ -11,29 +11,6 @@ =20 #include "libqos/libqtest.h" =20 -/* - * This used to trigger the assert in scsi_dma_complete - * https://bugs.launchpad.net/qemu/+bug/1878263 - */ -static void test_lp1878263_megasas_zero_iov_cnt(void) -{ - QTestState *s; - - s =3D qtest_init("-nographic -monitor none -serial none " - "-M q35 -device megasas -device scsi-cd,drive=3Dnull0 " - "-blockdev driver=3Dnull-co,read-zeroes=3Don,node-name= =3Dnull0"); - qtest_outl(s, 0xcf8, 0x80001818); - qtest_outl(s, 0xcfc, 0xc101); - qtest_outl(s, 0xcf8, 0x8000181c); - qtest_outl(s, 0xcf8, 0x80001804); - qtest_outw(s, 0xcfc, 0x7); - qtest_outl(s, 0xcf8, 0x8000186a); - qtest_writeb(s, 0x14, 0xfe); - qtest_writeb(s, 0x0, 0x02); - qtest_outb(s, 0xc1c0, 0x17); - qtest_quit(s); -} - static void test_lp1878642_pci_bus_get_irq_level_assert(void) { QTestState *s; @@ -103,8 +80,6 @@ int main(int argc, char **argv) g_test_init(&argc, &argv, NULL); =20 if (strcmp(arch, "i386") =3D=3D 0 || strcmp(arch, "x86_64") =3D=3D 0) { - qtest_add_func("fuzz/test_lp1878263_megasas_zero_iov_cnt", - test_lp1878263_megasas_zero_iov_cnt); qtest_add_func("fuzz/test_lp1878642_pci_bus_get_irq_level_assert", test_lp1878642_pci_bus_get_irq_level_assert); qtest_add_func("fuzz/test_mmio_oob_from_memory_region_cache", diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build index 2688e1bfad..b65efd6c5d 100644 --- a/tests/qtest/meson.build +++ b/tests/qtest/meson.build @@ -17,7 +17,9 @@ slow_qtests =3D { 'test-hmp' : 120, } =20 -qtests_generic =3D [ +qtests_generic =3D \ + (config_all_devices.has_key('CONFIG_MEGASAS_SCSI_PCI') ? 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Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) From: Philippe Mathieu-Daud=C3=A9 This test fails when QEMU is built without the virtio-scsi device, restrict it to its availability. Reviewed-by: Michael S. Tsirkin Signed-off-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Thomas Huth --- MAINTAINERS | 1 + tests/qtest/fuzz-test.c | 51 -------------------- tests/qtest/fuzz-virtio-scsi-test.c | 75 +++++++++++++++++++++++++++++ tests/qtest/meson.build | 1 + 4 files changed, 77 insertions(+), 51 deletions(-) create mode 100644 tests/qtest/fuzz-virtio-scsi-test.c diff --git a/MAINTAINERS b/MAINTAINERS index 0f560d1b91..71c835bc1d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1759,6 +1759,7 @@ S: Supported F: include/hw/scsi/* F: hw/scsi/* F: tests/qtest/virtio-scsi-test.c +F: tests/qtest/fuzz-virtio-scsi-test.c T: git https://github.com/bonzini/qemu.git scsi-next =20 SSI diff --git a/tests/qtest/fuzz-test.c b/tests/qtest/fuzz-test.c index 631feaf0eb..00149abec7 100644 --- a/tests/qtest/fuzz-test.c +++ b/tests/qtest/fuzz-test.c @@ -24,55 +24,6 @@ static void test_lp1878642_pci_bus_get_irq_level_assert(= void) qtest_quit(s); } =20 -/* - * Here a MemoryRegionCache pointed to an MMIO region but had a - * larger size than the underlying region. - */ -static void test_mmio_oob_from_memory_region_cache(void) -{ - QTestState *s; - - s =3D qtest_init("-M pc-q35-5.2 -display none -m 512M " - "-device virtio-scsi,num_queues=3D8,addr=3D03.0 "); - - qtest_outl(s, 0xcf8, 0x80001811); - qtest_outb(s, 0xcfc, 0x6e); - qtest_outl(s, 0xcf8, 0x80001824); - qtest_outl(s, 0xcf8, 0x80001813); - qtest_outl(s, 0xcfc, 0xa080000); - qtest_outl(s, 0xcf8, 0x80001802); - qtest_outl(s, 0xcfc, 0x5a175a63); - qtest_outb(s, 0x6e08, 0x9e); - qtest_writeb(s, 0x9f003, 0xff); - qtest_writeb(s, 0x9f004, 0x01); - qtest_writeb(s, 0x9e012, 0x0e); - qtest_writeb(s, 0x9e01b, 0x0e); - qtest_writeb(s, 0x9f006, 0x01); - qtest_writeb(s, 0x9f008, 0x01); - qtest_writeb(s, 0x9f00a, 0x01); - qtest_writeb(s, 0x9f00c, 0x01); - qtest_writeb(s, 0x9f00e, 0x01); - qtest_writeb(s, 0x9f010, 0x01); - qtest_writeb(s, 0x9f012, 0x01); - qtest_writeb(s, 0x9f014, 0x01); - qtest_writeb(s, 0x9f016, 0x01); - qtest_writeb(s, 0x9f018, 0x01); - qtest_writeb(s, 0x9f01a, 0x01); - qtest_writeb(s, 0x9f01c, 0x01); - qtest_writeb(s, 0x9f01e, 0x01); - qtest_writeb(s, 0x9f020, 0x01); - qtest_writeb(s, 0x9f022, 0x01); - qtest_writeb(s, 0x9f024, 0x01); - qtest_writeb(s, 0x9f026, 0x01); - qtest_writeb(s, 0x9f028, 0x01); - qtest_writeb(s, 0x9f02a, 0x01); - qtest_writeb(s, 0x9f02c, 0x01); - qtest_writeb(s, 0x9f02e, 0x01); - qtest_writeb(s, 0x9f030, 0x01); - qtest_outb(s, 0x6e10, 0x00); - qtest_quit(s); -} - int main(int argc, char **argv) { const char *arch =3D qtest_get_arch(); @@ -82,8 +33,6 @@ int main(int argc, char **argv) if (strcmp(arch, "i386") =3D=3D 0 || strcmp(arch, "x86_64") =3D=3D 0) { qtest_add_func("fuzz/test_lp1878642_pci_bus_get_irq_level_assert", test_lp1878642_pci_bus_get_irq_level_assert); - qtest_add_func("fuzz/test_mmio_oob_from_memory_region_cache", - test_mmio_oob_from_memory_region_cache); } =20 return g_test_run(); diff --git a/tests/qtest/fuzz-virtio-scsi-test.c b/tests/qtest/fuzz-virtio-= scsi-test.c new file mode 100644 index 0000000000..aaf6d10e18 --- /dev/null +++ b/tests/qtest/fuzz-virtio-scsi-test.c @@ -0,0 +1,75 @@ +/* + * QTest fuzzer-generated testcase for virtio-scsi device + * + * Copyright (c) 2020 Li Qiang + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "libqos/libqtest.h" + +/* + * Here a MemoryRegionCache pointed to an MMIO region but had a + * larger size than the underlying region. + */ +static void test_mmio_oob_from_memory_region_cache(void) +{ + QTestState *s; + + s =3D qtest_init("-M pc-q35-5.2 -display none -m 512M " + "-device virtio-scsi,num_queues=3D8,addr=3D03.0 "); + + qtest_outl(s, 0xcf8, 0x80001811); + qtest_outb(s, 0xcfc, 0x6e); + qtest_outl(s, 0xcf8, 0x80001824); + qtest_outl(s, 0xcf8, 0x80001813); + qtest_outl(s, 0xcfc, 0xa080000); + qtest_outl(s, 0xcf8, 0x80001802); + qtest_outl(s, 0xcfc, 0x5a175a63); + qtest_outb(s, 0x6e08, 0x9e); + qtest_writeb(s, 0x9f003, 0xff); + qtest_writeb(s, 0x9f004, 0x01); + qtest_writeb(s, 0x9e012, 0x0e); + qtest_writeb(s, 0x9e01b, 0x0e); + qtest_writeb(s, 0x9f006, 0x01); + qtest_writeb(s, 0x9f008, 0x01); + qtest_writeb(s, 0x9f00a, 0x01); + qtest_writeb(s, 0x9f00c, 0x01); + qtest_writeb(s, 0x9f00e, 0x01); + qtest_writeb(s, 0x9f010, 0x01); + qtest_writeb(s, 0x9f012, 0x01); + qtest_writeb(s, 0x9f014, 0x01); + qtest_writeb(s, 0x9f016, 0x01); + qtest_writeb(s, 0x9f018, 0x01); + qtest_writeb(s, 0x9f01a, 0x01); + qtest_writeb(s, 0x9f01c, 0x01); + qtest_writeb(s, 0x9f01e, 0x01); + qtest_writeb(s, 0x9f020, 0x01); + qtest_writeb(s, 0x9f022, 0x01); + qtest_writeb(s, 0x9f024, 0x01); + qtest_writeb(s, 0x9f026, 0x01); + qtest_writeb(s, 0x9f028, 0x01); + qtest_writeb(s, 0x9f02a, 0x01); + qtest_writeb(s, 0x9f02c, 0x01); + qtest_writeb(s, 0x9f02e, 0x01); + qtest_writeb(s, 0x9f030, 0x01); + qtest_outb(s, 0x6e10, 0x00); + qtest_quit(s); +} + +int main(int argc, char **argv) +{ + const char *arch =3D qtest_get_arch(); + + g_test_init(&argc, &argv, NULL); + + if (strcmp(arch, "i386") =3D=3D 0 || strcmp(arch, "x86_64") =3D=3D 0) { + qtest_add_func("fuzz/test_mmio_oob_from_memory_region_cache", + test_mmio_oob_from_memory_region_cache); + } + + return g_test_run(); +} diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build index b65efd6c5d..82b60f4d87 100644 --- a/tests/qtest/meson.build +++ b/tests/qtest/meson.build @@ -19,6 +19,7 @@ slow_qtests =3D { =20 qtests_generic =3D \ (config_all_devices.has_key('CONFIG_MEGASAS_SCSI_PCI') ? ['fuzz-megasas-= test'] : []) + \ + (config_all_devices.has_key('CONFIG_VIRTIO_SCSI') ? ['fuzz-virtio-scsi-t= est'] : []) + \ [ 'cdrom-test', 'device-introspect-test', --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=bu.edu) ARC-Seal: i=2; a=rsa-sha256; t=1615834458; cv=pass; d=zohomail.com; s=zohoarc; b=V58xt62ZIxyMcSj/AUK+8dttK+5BpytBeBwsOqhfcXJ0Z4R2wGTAJuURbNJ2w5C3Okllxl/FKvEUFjI7VdyHSw6DXA9r6ggdey0fdswzwbIK9fwImB/fBzdTanbsdx1QdmyVjbzyXBSirHHkFjzMDwONc/74VF2omEWN16xyv2w= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1615834458; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=k0eHyBh6jsRpQpcq5sq07dpFKHV+JHq5fC0kFYPIO/0=; 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Do it now. Signed-off-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Thomas Huth --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index 71c835bc1d..0bd720a3d6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2634,6 +2634,7 @@ R: Stefan Hajnoczi R: Thomas Huth S: Maintained F: tests/qtest/fuzz/ +F: tests/qtest/fuzz-*test.c F: scripts/oss-fuzz/ F: docs/devel/fuzzing.rst =20 --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=bu.edu) ARC-Seal: i=2; a=rsa-sha256; t=1615833977; cv=pass; d=zohomail.com; s=zohoarc; b=YKvdR6VO0h2p4Rh3Xl0+MYTTZn7yEyVkaPl3s2INeOtxnnYKA6b9JGk6SEXe19YNuLp06rX340rav4/KgYrFQO/y02GVx1CM5iT1NPWynO5DStyPL4cM7dD2kpeOHTZtWiT+u/zyuXiMm2yNUsbqwDLYQgbA8ZldsG2gvu0/jF8= ARC-Message-Signature: i=2; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.95.107; envelope-from=alxndr@bu.edu; helo=NAM02-DM3-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-0.001, SPF_HELO_NONE=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: Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) The device-type names for the pro100 network cards, are i8255.. We were matching "eepro", which catches the PCI PIO/MMIO regions for those devices, however misses the actual PCI device, which we use to map the BARs, before fuzzing. Fix that Signed-off-by: Alexander Bulekov Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- tests/qtest/fuzz/generic_fuzz_configs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/qtest/fuzz/generic_fuzz_configs.h b/tests/qtest/fuzz/gen= eric_fuzz_configs.h index 5d599765c4..2454c627ff 100644 --- a/tests/qtest/fuzz/generic_fuzz_configs.h +++ b/tests/qtest/fuzz/generic_fuzz_configs.h @@ -177,7 +177,7 @@ const generic_fuzz_config predefined_configs[] =3D { .name =3D "i82550", .args =3D "-machine q35 -nodefaults " "-device i82550,netdev=3Dnet0 -netdev user,id=3Dnet0", - .objects =3D "eepro*" + .objects =3D "i8255*" },{ .name =3D "sdhci-v3", .args =3D "-nodefaults -device sdhci-pci,sd-spec-version=3D3 " --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=bu.edu; From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PULL 05/11] fuzz: don't leave orphan llvm-symbolizers around Date: Mon, 15 Mar 2021 14:38:06 -0400 Message-Id: <20210315183812.27760-6-alxndr@bu.edu> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210315183812.27760-1-alxndr@bu.edu> References: <20210315183812.27760-1-alxndr@bu.edu> Content-Transfer-Encoding: quoted-printable X-Originating-IP: [128.197.127.33] X-ClientProxiedBy: BL1PR13CA0323.namprd13.prod.outlook.com (2603:10b6:208:2c1::28) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 10cb7bda-e58b-4929-9f2c-08d8e7e18608 X-MS-TrafficTypeDiagnostic: SN6PR03MB4286: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.95.131; envelope-from=alxndr@bu.edu; helo=NAM02-DM3-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-0.001, SPF_HELO_NONE=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: Paolo Bonzini , Thomas Huth , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" I noticed that with a sufficiently small timeout, the fuzzer fork-server sometimes locks up. On closer inspection, the issue appeared to be caused by entering our SIGALRM handler, while libfuzzer is in it's crash handlers. Because libfuzzer relies on pipe communication with an external child process to print out stack-traces, we shouldn't exit early, and leave an orphan child. Check for children in the SIGALRM handler to avoid this issue. Signed-off-by: Alexander Bulekov Acked-by: Thomas Huth Reviewed-by: Darren Kenny --- tests/qtest/fuzz/generic_fuzz.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuz= z.c index ee8c17a04c..387ae2020a 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -583,6 +583,21 @@ static void handle_timeout(int sig) fprintf(stderr, "[Timeout]\n"); fflush(stderr); } + + /* + * If there is a crash, libfuzzer/ASAN forks a child to run an + * "llvm-symbolizer" process for printing out a pretty stacktrace. It + * communicates with this child using a pipe. If we timeout+Exit, whi= le + * libfuzzer is still communicating with the llvm-symbolizer child, we= will + * be left with an orphan llvm-symbolizer process. Sometimes, this app= ears + * to lead to a deadlock in the forkserver. Use waitpid to check if th= ere + * are any waitable children. If so, exit out of the signal-handler, a= nd + * let libfuzzer finish communicating with the child, and exit, on its= own. + */ + if (waitpid(-1, NULL, WNOHANG) =3D=3D 0) { + return; + } + _Exit(0); } =20 --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=bu.edu) ARC-Seal: i=2; a=rsa-sha256; t=1615834261; cv=pass; d=zohomail.com; s=zohoarc; b=H76LDKx6114gpJ6ddP+WunjYvQAM7Nq8pkerNOhY0EA07jwosGp8x1vx+bPMPzbf32JommKntxKQ84HyZZYOnq4XhesanUk8fHUy0HYE9FR+oFBYjTmS76+nNzTD0vav+kY4ZY20B/iXo/YECn2tf48DM4ggZZzXA0FwfR6rKWc= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1615834261; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.75.120; envelope-from=alxndr@bu.edu; helo=NAM02-BL2-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-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: Paolo Bonzini , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" Currently, bash and C crash reproducers are be built manually. This is a problem, as we want to integrate reproducers into the tree, for regression testing. This patch adds a script that converts a sequence of QTest commands into a pasteable Bash reproducer, or a libqtest-based C program. This will try to wrap pasteable reproducers to 72 chars, but the generated C code will not have nice formatting. Therefore, the C output of this script should be piped through an auto-formatter, such as clang-format Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- scripts/oss-fuzz/output_reproducer.py | 160 ++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100755 scripts/oss-fuzz/output_reproducer.py diff --git a/scripts/oss-fuzz/output_reproducer.py b/scripts/oss-fuzz/outpu= t_reproducer.py new file mode 100755 index 0000000000..3608b0600e --- /dev/null +++ b/scripts/oss-fuzz/output_reproducer.py @@ -0,0 +1,160 @@ +#!/usr/bin/env python3 +# -*- coding: utf-8 -*- + +""" +Convert plain qtest traces to C or Bash reproducers + +Use this to help build bug-reports or create in-tree reproducers for bugs. +Note: This will not format C code for you. Pipe the output through +clang-format -style=3D"{BasedOnStyle: llvm, IndentWidth: 4, ColumnLimit: 9= 0}" +or similar +""" + +import sys +import os +import argparse +import textwrap +from datetime import date + +__author__ =3D "Alexander Bulekov " +__copyright__ =3D "Copyright (C) 2021, Red Hat, Inc." +__license__ =3D "GPL version 2 or (at your option) any later version" + +__maintainer__ =3D "Alexander Bulekov" +__email__ =3D "alxndr@bu.edu" + + +def c_header(owner): + return """/* + * Autogenerated Fuzzer Test Case + * + * Copyright (c) {date} {owner} + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "libqos/libqtest.h" + + """.format(date=3Ddate.today().year, owner=3Downer) + +def c_comment(s): + """ Return a multi-line C comment. Assume the text is already wrapped = """ + return "/*\n * " + "\n * ".join(s.splitlines()) + "\n*/" + +def print_c_function(s): + print("/* ") + for l in s.splitlines(): + print(" * {}".format(l)) + +def bash_reproducer(path, args, trace): + result =3D '\\\n'.join(textwrap.wrap("cat << EOF | {} {}".format(path,= args), + 72, break_on_hyphens=3DFalse, + drop_whitespace=3DFalse)) + for l in trace.splitlines(): + result +=3D "\n" + '\\\n'.join(textwrap.wrap(l,72,drop_whitespace= =3DFalse)) + result +=3D "\nEOF" + return result + +def c_reproducer(name, args, trace): + result =3D [] + result.append("""static void {}(void)\n{{""".format(name)) + + # libqtest will add its own qtest args, so get rid of them + args =3D args.replace("-accel qtest","") + args =3D args.replace(",accel=3Dqtest","") + args =3D args.replace("-machine accel=3Dqtest","") + args =3D args.replace("-qtest stdio","") + result.append("""QTestState *s =3D qtest_init("{}");""".format(args)) + for l in trace.splitlines(): + param =3D l.split() + cmd =3D param[0] + if cmd =3D=3D "write": + buf =3D param[3][2:] #Get the 0x... buffer and trim the "0x" + assert len(buf)%2 =3D=3D 0 + bufbytes =3D [buf[i:i+2] for i in range(0, len(buf), 2)] + bufstring =3D '\\x'+'\\x'.join(bufbytes) + addr =3D param[1] + size =3D param[2] + result.append("""qtest_bufwrite(s, {}, "{}", {});""".format( + addr, bufstring, size)) + elif cmd.startswith("in") or cmd.startswith("read"): + result.append("qtest_{}(s, {});".format( + cmd, param[1])) + elif cmd.startswith("out") or cmd.startswith("write"): + result.append("qtest_{}(s, {}, {});".format( + cmd, param[1], param[2])) + elif cmd =3D=3D "clock_step": + if len(param) =3D=3D1: + result.append("qtest_clock_step_next(s);") + else: + result.append("qtest_clock_step(s, {});".format(param[1])) + result.append("qtest_quit(s);\n}") + return "\n".join(result) + +def c_main(name, arch): + return """int main(int argc, char **argv) +{{ + const char *arch =3D qtest_get_arch(); + + g_test_init(&argc, &argv, NULL); + + if (strcmp(arch, "{arch}") =3D=3D 0) {{ + qtest_add_func("fuzz/{name}",{name}); + }} + + return g_test_run(); +}}""".format(name=3Dname, arch=3Darch) + +def main(): + parser =3D argparse.ArgumentParser() + group =3D parser.add_mutually_exclusive_group() + group.add_argument("-bash", help=3D"Only output a copy-pastable bash c= ommand", + action=3D"store_true") + group.add_argument("-c", help=3D"Only output a c function", + action=3D"store_true") + parser.add_argument('-owner', help=3D"If generating complete C source = code, \ + this specifies the Copyright owner", + nargs=3D'?', default=3D"") + parser.add_argument("-no_comment", help=3D"Don't include a bash reprod= ucer \ + as a comment in the C reproducers", + action=3D"store_true") + parser.add_argument('-name', help=3D"The name of the c function", + nargs=3D'?', default=3D"test_fuzz") + parser.add_argument('input_trace', help=3D"input QTest command sequenc= e \ + (stdin by default)", + nargs=3D'?', type=3Dargparse.FileType('r'), + default=3Dsys.stdin) + args =3D parser.parse_args() + + qemu_path =3D os.getenv("QEMU_PATH") + qemu_args =3D os.getenv("QEMU_ARGS") + if not qemu_args or not qemu_path: + print("Please set QEMU_PATH and QEMU_ARGS environment variables") + sys.exit(1) + + bash_args =3D qemu_args + if " -qtest stdio" not in qemu_args: + bash_args +=3D " -qtest stdio" + + arch =3D qemu_path.split("-")[-1] + trace =3D args.input_trace.read().strip() + + if args.bash : + print(bash_reproducer(qemu_path, bash_args, trace)) + else: + output =3D "" + if not args.c: + output +=3D c_header(args.owner) + "\n" + if not args.no_comment: + output +=3D c_comment(bash_reproducer(qemu_path, bash_args, tr= ace)) + output +=3D c_reproducer(args.name, qemu_args, trace) + if not args.c: + output +=3D c_main(args.name, arch) + print(output) + + +if __name__ =3D=3D '__main__': + main() --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.68.136; envelope-from=alxndr@bu.edu; helo=NAM04-BN3-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-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: Paolo Bonzini , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" We have several scripts that help build reproducers, but no documentation for how they should be used. Add some documentation Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- docs/devel/fuzzing.rst | 45 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/docs/devel/fuzzing.rst b/docs/devel/fuzzing.rst index 97797c4f8c..025fb0c19b 100644 --- a/docs/devel/fuzzing.rst +++ b/docs/devel/fuzzing.rst @@ -210,6 +210,51 @@ Build details: - The script responsible for building the fuzzers can be found in the QEMU source tree at ``scripts/oss-fuzz/build.sh`` =20 +Building Crash Reproducers +----------------------------------------- +When we find a crash, we should try to create an independent reproducer, t= hat +can be used on a non-fuzzer build of QEMU. This filters out any potential +false-positives, and improves the debugging experience for developers. +Here are the steps for building a reproducer for a crash found by the +generic-fuzz target. + - Ensure the crash reproduces:: + qemu-fuzz-i386 --fuzz-target... ./crash-... + + - Gather the QTest output for the crash:: + QEMU_FUZZ_TIMEOUT=3D0 QTEST_LOG=3D1 FUZZ_SERIALIZE_QTEST=3D1 \ + qemu-fuzz-i386 --fuzz-target... ./crash-... &> /tmp/trace + + - Reorder and clean-up the resulting trace:: + scripts/oss-fuzz/reorder_fuzzer_qtest_trace.py /tmp/trace > /tmp/reprod= ucer + + - Get the arguments needed to start qemu, and provide a path to qemu:: + less /tmp/trace # The args should be logged at the top of this file + export QEMU_ARGS=3D"-machine ..." + export QEMU_PATH=3D"path/to/qemu-system" + + - Ensure the crash reproduces in qemu-system:: + $QEMU_PATH $QEMU_ARGS -qtest stdio < /tmp/reproducer + + - From the crash output, obtain some string that identifies the crash. Th= is + can be a line in the stack-trace, for example:: + export CRASH_TOKEN=3D"hw/usb/hcd-xhci.c:1865" + + - Minimize the reproducer:: + scripts/oss-fuzz/minimize_qtest_trace.py -M1 -M2 \ + /tmp/reproducer /tmp/reproducer-minimized + + - Confirm that the minimized reproducer still crashes:: + $QEMU_PATH $QEMU_ARGS -qtest stdio < /tmp/reproducer-minimized + + - Create a one-liner reproducer that can be sent over email:: + ./scripts/oss-fuzz/output_reproducer.py -bash /tmp/reproducer-minimized + + - Output the C source code for a test case that will reproduce the bug :: + ./scripts/oss-fuzz/output_reproducer.py -owner "John Smith "\ + -name "test_function_name" /tmp/reproducer-minimized + + - Report the bug and send a patch with the C reproducer upstream + Implementation Details / Fuzzer Lifecycle ----------------------------------------- =20 --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.75.120; envelope-from=alxndr@bu.edu; helo=NAM02-BL2-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-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: Paolo Bonzini , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- tests/qtest/fuzz/generic_fuzz_configs.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tests/qtest/fuzz/generic_fuzz_configs.h b/tests/qtest/fuzz/gen= eric_fuzz_configs.h index 2454c627ff..8b8c7ac553 100644 --- a/tests/qtest/fuzz/generic_fuzz_configs.h +++ b/tests/qtest/fuzz/generic_fuzz_configs.h @@ -208,6 +208,12 @@ const generic_fuzz_config predefined_configs[] =3D { .args =3D "-machine q35 -nodefaults -device megasas -device scsi-c= d,drive=3Dnull0 " "-blockdev driver=3Dnull-co,read-zeroes=3Don,node-name=3Dnull0", .objects =3D "megasas*", + },{ + .name =3D "am53c974", + .args =3D "-device am53c974,id=3Dscsi -device scsi-hd,drive=3Ddisk= 0 " + "-drive id=3Ddisk0,if=3Dnone,file=3Dnull-co://,format=3Dr= aw " + "-nodefaults", + .objects =3D "*esp* *scsi* *am53c974*", },{ .name =3D "ac97", .args =3D "-machine q35 -nodefaults " --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=bu.edu; From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PULL 09/11] memory: add a sparse memory device for fuzzing Date: Mon, 15 Mar 2021 14:38:10 -0400 Message-Id: <20210315183812.27760-10-alxndr@bu.edu> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210315183812.27760-1-alxndr@bu.edu> References: <20210315183812.27760-1-alxndr@bu.edu> Content-Transfer-Encoding: quoted-printable X-Originating-IP: [128.197.127.33] X-ClientProxiedBy: BL1PR13CA0323.namprd13.prod.outlook.com (2603:10b6:208:2c1::28) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 761d6c8d-b7a9-4586-8b4d-08d8e7e187e8 X-MS-TrafficTypeDiagnostic: SA2PR03MB5724: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:298; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.75.120; envelope-from=alxndr@bu.edu; helo=NAM02-BL2-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-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: Paolo Bonzini , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" For testing, it can be useful to simulate an enormous amount of memory (e.g. 2^64 RAM). This adds an MMIO device that acts as sparse memory. When something writes a nonzero value to a sparse-mem address, we allocate a block of memory. For now, since the only user of this device is the fuzzer, we do not track and free zeroed blocks. The device has a very low priority (so it can be mapped beneath actual RAM, and virtual device MMIO regions). Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- MAINTAINERS | 1 + hw/mem/meson.build | 1 + hw/mem/sparse-mem.c | 151 ++++++++++++++++++++++++++++++++++++ include/hw/mem/sparse-mem.h | 19 +++++ 4 files changed, 172 insertions(+) create mode 100644 hw/mem/sparse-mem.c create mode 100644 include/hw/mem/sparse-mem.h diff --git a/MAINTAINERS b/MAINTAINERS index 0bd720a3d6..2a925e76ea 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2636,6 +2636,7 @@ S: Maintained F: tests/qtest/fuzz/ F: tests/qtest/fuzz-*test.c F: scripts/oss-fuzz/ +F: hw/mem/sparse-mem.c F: docs/devel/fuzzing.rst =20 Register API diff --git a/hw/mem/meson.build b/hw/mem/meson.build index 0d22f2b572..ef79e04678 100644 --- a/hw/mem/meson.build +++ b/hw/mem/meson.build @@ -1,5 +1,6 @@ mem_ss =3D ss.source_set() mem_ss.add(files('memory-device.c')) +mem_ss.add(when: 'CONFIG_FUZZ', if_true: files('sparse-mem.c')) mem_ss.add(when: 'CONFIG_DIMM', if_true: files('pc-dimm.c')) mem_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_mc.c')) mem_ss.add(when: 'CONFIG_NVDIMM', if_true: files('nvdimm.c')) diff --git a/hw/mem/sparse-mem.c b/hw/mem/sparse-mem.c new file mode 100644 index 0000000000..a13ac74dd9 --- /dev/null +++ b/hw/mem/sparse-mem.c @@ -0,0 +1,151 @@ +/* + * A sparse memory device. Useful for fuzzing + * + * Copyright Red Hat Inc., 2021 + * + * Authors: + * Alexander Bulekov + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "exec/address-spaces.h" +#include "hw/qdev-properties.h" +#include "hw/sysbus.h" +#include "qapi/error.h" +#include "qemu/units.h" +#include "sysemu/qtest.h" +#include "hw/mem/sparse-mem.h" + +#define SPARSE_MEM(obj) OBJECT_CHECK(SparseMemState, (obj), TYPE_SPARSE_ME= M) +#define SPARSE_BLOCK_SIZE 0x1000 + +typedef struct SparseMemState { + SysBusDevice parent_obj; + MemoryRegion mmio; + uint64_t baseaddr; + uint64_t length; + uint64_t size_used; + uint64_t maxsize; + GHashTable *mapped; +} SparseMemState; + +typedef struct sparse_mem_block { + uint8_t data[SPARSE_BLOCK_SIZE]; +} sparse_mem_block; + +static uint64_t sparse_mem_read(void *opaque, hwaddr addr, unsigned int si= ze) +{ + SparseMemState *s =3D opaque; + uint64_t ret =3D 0; + size_t pfn =3D addr / SPARSE_BLOCK_SIZE; + size_t offset =3D addr % SPARSE_BLOCK_SIZE; + sparse_mem_block *block; + + block =3D g_hash_table_lookup(s->mapped, (void *)pfn); + if (block) { + assert(offset + size <=3D sizeof(block->data)); + memcpy(&ret, block->data + offset, size); + } + return ret; +} + +static void sparse_mem_write(void *opaque, hwaddr addr, uint64_t v, + unsigned int size) +{ + SparseMemState *s =3D opaque; + size_t pfn =3D addr / SPARSE_BLOCK_SIZE; + size_t offset =3D addr % SPARSE_BLOCK_SIZE; + sparse_mem_block *block; + + if (!g_hash_table_lookup(s->mapped, (void *)pfn) && + s->size_used + SPARSE_BLOCK_SIZE < s->maxsize && v) { + g_hash_table_insert(s->mapped, (void *)pfn, + g_new0(sparse_mem_block, 1)); + s->size_used +=3D sizeof(block->data); + } + block =3D g_hash_table_lookup(s->mapped, (void *)pfn); + if (!block) { + return; + } + + assert(offset + size <=3D sizeof(block->data)); + + memcpy(block->data + offset, &v, size); + +} + +static const MemoryRegionOps sparse_mem_ops =3D { + .read =3D sparse_mem_read, + .write =3D sparse_mem_write, + .endianness =3D DEVICE_LITTLE_ENDIAN, + .valid =3D { + .min_access_size =3D 1, + .max_access_size =3D 8, + .unaligned =3D false, + }, +}; + +static Property sparse_mem_properties[] =3D { + /* The base address of the memory */ + DEFINE_PROP_UINT64("baseaddr", SparseMemState, baseaddr, 0x0), + /* The length of the sparse memory region */ + DEFINE_PROP_UINT64("length", SparseMemState, length, UINT64_MAX), + /* Max amount of actual memory that can be used to back the sparse mem= ory */ + DEFINE_PROP_UINT64("maxsize", SparseMemState, maxsize, 10 * MiB), + DEFINE_PROP_END_OF_LIST(), +}; + +MemoryRegion *sparse_mem_init(uint64_t addr, uint64_t length) +{ + DeviceState *dev; + + dev =3D qdev_new(TYPE_SPARSE_MEM); + qdev_prop_set_uint64(dev, "baseaddr", addr); + qdev_prop_set_uint64(dev, "length", length); + sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); + sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000); + return &SPARSE_MEM(dev)->mmio; +} + +static void sparse_mem_realize(DeviceState *dev, Error **errp) +{ + SparseMemState *s =3D SPARSE_MEM(dev); + SysBusDevice *sbd =3D SYS_BUS_DEVICE(dev); + + if (!qtest_enabled()) { + error_setg(errp, "sparse_mem device should only be used " + "for testing with QTest"); + return; + } + + assert(s->baseaddr + s->length > s->baseaddr); + + s->mapped =3D g_hash_table_new(NULL, NULL); + memory_region_init_io(&s->mmio, OBJECT(s), &sparse_mem_ops, s, + "sparse-mem", s->length); + sysbus_init_mmio(sbd, &s->mmio); +} + +static void sparse_mem_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + + device_class_set_props(dc, sparse_mem_properties); + + dc->desc =3D "Sparse Memory Device"; + dc->realize =3D sparse_mem_realize; +} + +static const TypeInfo sparse_mem_types[] =3D { + { + .name =3D TYPE_SPARSE_MEM, + .parent =3D TYPE_SYS_BUS_DEVICE, + .instance_size =3D sizeof(SparseMemState), + .class_init =3D sparse_mem_class_init, + }, +}; +DEFINE_TYPES(sparse_mem_types); diff --git a/include/hw/mem/sparse-mem.h b/include/hw/mem/sparse-mem.h new file mode 100644 index 0000000000..f9863b154b --- /dev/null +++ b/include/hw/mem/sparse-mem.h @@ -0,0 +1,19 @@ +/* + * A sparse memory device. Useful for fuzzing + * + * Copyright Red Hat Inc., 2021 + * + * Authors: + * Alexander Bulekov + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#ifndef SPARSE_MEM_H +#define SPARSE_MEM_H +#define TYPE_SPARSE_MEM "sparse-mem" + +MemoryRegion *sparse_mem_init(uint64_t addr, uint64_t length); + +#endif --=20 2.27.0 From nobody Tue May 21 02:50:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=bu.edu) ARC-Seal: i=2; a=rsa-sha256; t=1615834610; cv=pass; d=zohomail.com; s=zohoarc; b=JSBg5WNgMsKBuxY/ItPHBB9D3FlEv7Zd+mjUKwlnbXNAU9AYOivnpg/1CUFyDyHCl9tZflC1hxiXvqu7VNFtB03dz+6ms9qdEladI3hjRe02QbBq5uvtdCqGlD4p7xil6WjF4CyxxsMGxywySJBm8MAFaX106xbA4TaMO1oq8Cg= ARC-Message-Signature: i=2; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.68.136; envelope-from=alxndr@bu.edu; helo=NAM04-BN3-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-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: Paolo Bonzini , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" The generic-fuzzer often provides randomized DMA addresses to virtual-devices. For a 64-bit address-space, the chance of these randomized addresses coinciding with RAM regions, is fairly small. Even though the fuzzer's instrumentation eventually finds valid addresses, this can take some-time, and slows-down fuzzing progress (especially, when multiple DMA buffers are involved). To work around this, create "fake" sparse-memory that spans all of the 64-bit address-space. Adjust the DMA call-back to populate this sparse memory, correspondingly Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- tests/qtest/fuzz/generic_fuzz.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuz= z.c index 387ae2020a..b5fe27aae1 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -28,6 +28,7 @@ #include "hw/pci/pci.h" #include "hw/boards.h" #include "generic_fuzz_configs.h" +#include "hw/mem/sparse-mem.h" =20 /* * SEPARATOR is used to separate "operations" in the fuzz input @@ -64,6 +65,8 @@ static useconds_t timeout =3D DEFAULT_TIMEOUT_US; =20 static bool qtest_log_enabled; =20 +MemoryRegion *sparse_mem_mr; + /* * A pattern used to populate a DMA region or perform a memwrite. This is * useful for e.g. populating tables of unique addresses. @@ -191,8 +194,7 @@ void fuzz_dma_read_cb(size_t addr, size_t len, MemoryRe= gion *mr) */ if (dma_patterns->len =3D=3D 0 || len =3D=3D 0 - || mr !=3D current_machine->ram - || addr > current_machine->ram_size) { + || (mr !=3D current_machine->ram && mr !=3D sparse_mem_mr)) { return; } =20 @@ -238,7 +240,7 @@ void fuzz_dma_read_cb(size_t addr, size_t len, MemoryRe= gion *mr) MEMTXATTRS_UNSPECIFIED); =20 if (!(memory_region_is_ram(mr1) || - memory_region_is_romd(mr1))) { + memory_region_is_romd(mr1)) && mr1 !=3D sparse_mem_mr) { l =3D memory_access_size(mr1, l, addr1); } else { /* ROM/RAM case */ @@ -814,6 +816,12 @@ static void generic_pre_fuzz(QTestState *s) } qts_global =3D s; =20 + /* + * Create a special device that we can use to back DMA buffers at very + * high memory addresses + */ + sparse_mem_mr =3D sparse_mem_init(0, UINT64_MAX); + dma_regions =3D g_array_new(false, false, sizeof(address_range)); dma_patterns =3D g_array_new(false, false, sizeof(pattern)); 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dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=bu.edu; From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PULL 11/11] fuzz: move some DMA hooks Date: Mon, 15 Mar 2021 14:38:12 -0400 Message-Id: <20210315183812.27760-12-alxndr@bu.edu> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210315183812.27760-1-alxndr@bu.edu> References: <20210315183812.27760-1-alxndr@bu.edu> Content-Transfer-Encoding: quoted-printable X-Originating-IP: [128.197.127.33] X-ClientProxiedBy: BL1PR13CA0323.namprd13.prod.outlook.com (2603:10b6:208:2c1::28) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 393a48f2-8733-453e-cf39-08d8e7e188fb X-MS-TrafficTypeDiagnostic: SA2PR03MB5724: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4714; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.75.120; envelope-from=alxndr@bu.edu; helo=NAM02-BL2-obe.outbound.protection.outlook.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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=-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: Paolo Bonzini , Darren Kenny , Alexander Bulekov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" For the sparse-mem device, we want the fuzzer to populate entire DMA reads from sparse-mem, rather than hooking into the individual MMIO memory_region_dispatch_read operations. Otherwise, the fuzzer will treat each sequential read separately (and populate it with a separate pattern). Work around this by rearranging some DMA hooks. Since the fuzzer has it's own logic to skip accidentally writing to MMIO regions, we can call the DMA cb, outside the flatview_translate loop. Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- softmmu/memory.c | 1 - softmmu/physmem.c | 2 +- 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/softmmu/memory.c b/softmmu/memory.c index 9db47b7db6..c4730ec47a 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1440,7 +1440,6 @@ MemTxResult memory_region_dispatch_read(MemoryRegion = *mr, unsigned size =3D memop_size(op); MemTxResult r; =20 - fuzz_dma_read_cb(addr, size, mr); if (!memory_region_access_valid(mr, addr, size, false, attrs)) { *pval =3D unassigned_mem_read(mr, addr, size); return MEMTX_DECODE_ERROR; diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 7e8b0fab89..6a58c86750 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -2831,6 +2831,7 @@ MemTxResult flatview_read_continue(FlatView *fv, hwad= dr addr, bool release_lock =3D false; uint8_t *buf =3D ptr; =20 + fuzz_dma_read_cb(addr, len, mr); for (;;) { if (!memory_access_is_direct(mr, false)) { /* I/O case */ @@ -2841,7 +2842,6 @@ MemTxResult flatview_read_continue(FlatView *fv, hwad= dr addr, stn_he_p(buf, l, val); } else { /* RAM case */ - fuzz_dma_read_cb(addr, len, mr); ram_ptr =3D qemu_ram_ptr_length(mr->ram_block, addr1, &l, fals= e); memcpy(buf, ram_ptr, l); } --=20 2.27.0