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charset="utf-8" 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 | 100 +++++++++++++++++++++++++++++++++++ 2 files changed, 101 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..cd7d086442 --- /dev/null +++ b/tests/fuzz/virtio_net_fuzz.c @@ -0,0 +1,100 @@ +/* + * 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 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 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 register_virtio_net_fuzz_targets(void) +{ + fuzz_add_qos_target(&(FuzzTarget){ + .name =3D "virtio-net-fork-fuzz", + .description =3D "Fuzz the virtio-net virtual queues, fork= ing" + "for each fuzz run", + .pre_vm_init =3D &counter_shm_init, + .pre_fuzz =3D &qos_init_path, + .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