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Fri, 29 Nov 2019 21:34:53 +0000 From: "Oleinik, Alexander" To: "qemu-devel@nongnu.org" Subject: [PATCH v6 19/21] fuzz: add virtio-net fuzz target Thread-Topic: [PATCH v6 19/21] fuzz: add virtio-net fuzz target Thread-Index: AQHVpvzW/QZ/3r6zEUyEzo53K9zodw== Date: Fri, 29 Nov 2019 21:34:52 +0000 Message-ID: <20191129213424.6290-20-alxndr@bu.edu> References: <20191129213424.6290-1-alxndr@bu.edu> In-Reply-To: <20191129213424.6290-1-alxndr@bu.edu> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.23.0 x-originating-ip: [128.197.127.33] x-clientproxiedby: BL0PR1501CA0025.namprd15.prod.outlook.com (2603:10b6:207:17::38) To DM6PR03MB4795.namprd03.prod.outlook.com (2603:10b6:5:18c::22) authentication-results: spf=none (sender IP is ) smtp.mailfrom=alxndr@bu.edu; x-ms-exchange-messagesentrepresentingtype: 1 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 0a35104f-0620-44e2-dd94-08d77513f868 x-ms-traffictypediagnostic: DM6PR03MB5050: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:389; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: bu.edu X-MS-Exchange-CrossTenant-Network-Message-Id: 0a35104f-0620-44e2-dd94-08d77513f868 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Nov 2019 21:34:52.9874 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: d57d32cc-c121-488f-b07b-dfe705680c71 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: IyGM7MvXyJ36sZL5oMwOIW8G+XpVBqQrskZd+bqZzvMZUfzivR7lx1BSNoX/w+FY X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR03MB5050 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.79.122 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: "pbonzini@redhat.com" , "bsd@redhat.com" , "stefanha@redhat.com" , "Oleinik, Alexander" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The virtio-net fuzz target feeds inputs to all three virtio-net virtqueues, and uses forking to avoid leaking state between fuzz runs. Signed-off-by: Alexander Bulekov --- tests/fuzz/Makefile.include | 1 + tests/fuzz/virtio_net_fuzz.c | 105 +++++++++++++++++++++++++++++++++++ 2 files changed, 106 insertions(+) create mode 100644 tests/fuzz/virtio_net_fuzz.c diff --git a/tests/fuzz/Makefile.include b/tests/fuzz/Makefile.include index 37d6821bee..f1d9b46b1c 100644 --- a/tests/fuzz/Makefile.include +++ b/tests/fuzz/Makefile.include @@ -6,5 +6,6 @@ fuzz-obj-y +=3D tests/fuzz/fork_fuzz.o fuzz-obj-y +=3D tests/fuzz/qos_fuzz.o =20 fuzz-obj-y +=3D tests/fuzz/i440fx_fuzz.o +fuzz-obj-y +=3D tests/fuzz/virtio_net_fuzz.o =20 FUZZ_LDFLAGS +=3D -Xlinker -T$(SRC_PATH)/tests/fuzz/fork_fuzz.ld diff --git a/tests/fuzz/virtio_net_fuzz.c b/tests/fuzz/virtio_net_fuzz.c new file mode 100644 index 0000000000..f8efe3d7fd --- /dev/null +++ b/tests/fuzz/virtio_net_fuzz.c @@ -0,0 +1,105 @@ +/* + * virtio-net Fuzzing Target + * + * Copyright Red Hat Inc., 2019 + * + * 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 "fuzz.h" +#include "fork_fuzz.h" +#include "qos_fuzz.h" +#include "tests/libqtest.h" +#include "tests/libqos/virtio-net.h" + + +static void virtio_net_fuzz_multi(QTestState *s, + const unsigned char *Data, size_t Size) +{ + typedef struct vq_action { + uint8_t queue; + uint8_t length; + uint8_t write; + uint8_t next; + } vq_action; + + uint32_t free_head =3D 0; + + QGuestAllocator *t_alloc =3D fuzz_qos_alloc; + + QVirtioNet *net_if =3D fuzz_qos_obj; + QVirtioDevice *dev =3D net_if->vdev; + QVirtQueue *q; + vq_action vqa; + while (Size >=3D sizeof(vqa)) { + memcpy(&vqa, Data, sizeof(vqa)); + Data +=3D sizeof(vqa); + Size -=3D sizeof(vqa); + + q =3D net_if->queues[vqa.queue % 3]; + + vqa.length =3D vqa.length >=3D Size ? Size : vqa.length; + + uint64_t req_addr =3D guest_alloc(t_alloc, vqa.length); + qtest_memwrite(s, req_addr, Data, vqa.length); + free_head =3D qvirtqueue_add(s, q, req_addr, vqa.length, + vqa.write, vqa.next); + qvirtqueue_add(s, q, req_addr, vqa.length, vqa.write , vqa.next); + qvirtqueue_kick(s, dev, q, free_head); + Data +=3D vqa.length; + Size -=3D vqa.length; + } +} + +static void virtio_net_fork_fuzz(QTestState *s, + const unsigned char *Data, size_t Size) +{ + if (fork() =3D=3D 0) { + virtio_net_fuzz_multi(s, Data, Size); + flush_events(s); + _Exit(0); + } else { + wait(NULL); + } +} + +static void virtio_net_pre_fuzz(QTestState *s) +{ + qos_init_path(s); + counter_shm_init(); +} + +static int *sv; + +static void *virtio_net_test_setup_socket(GString *cmd_line, void *arg) +{ + if (!sv) { + sv =3D g_new(int, 2); + int ret =3D socketpair(PF_UNIX, SOCK_STREAM, 0, sv); + fcntl(sv[0], F_SETFL, O_NONBLOCK); + g_assert_cmpint(ret, !=3D, -1); + } + g_string_append_printf(cmd_line, " -netdev socket,fd=3D%d,id=3Dhs0 ", = sv[1]); + return arg; +} + +static void register_virtio_net_fuzz_targets(void) +{ + fuzz_add_qos_target(&(FuzzTarget){ + .name =3D "virtio-net-fuzz", + .description =3D "Fuzz the virtio-net virtual queues, fork= ing" + "for each fuzz run", + .pre_fuzz =3D &virtio_net_pre_fuzz, + .fuzz =3D virtio_net_fork_fuzz,}, + "virtio-net", + &(QOSGraphTestOptions){.before =3D virtio_net_test_setup_s= ocket} + ); +} + +fuzz_target_init(register_virtio_net_fuzz_targets); --=20 2.23.0