diff options
Diffstat (limited to '')
| -rw-r--r-- | fuzz/fuzz_netlink.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/fuzz/fuzz_netlink.c b/fuzz/fuzz_netlink.c new file mode 100644 index 0000000..2fa897e --- /dev/null +++ b/fuzz/fuzz_netlink.c @@ -0,0 +1,164 @@ +/* + * Copyright (c) 2020 Yubico AB. All rights reserved. + * Use of this source code is governed by a BSD-style + * license that can be found in the LICENSE file. + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include <assert.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> + +#include "../openbsd-compat/openbsd-compat.h" +#include "mutator_aux.h" +#include "dummy.h" + +struct param { + int seed; + int dev; + struct blob wiredata; +}; + +struct param * +unpack(const uint8_t *ptr, size_t len) +{ + cbor_item_t *item = NULL, **v; + struct cbor_load_result cbor; + struct param *p; + int ok = -1; + + if ((p = calloc(1, sizeof(*p))) == NULL || + (item = cbor_load(ptr, len, &cbor)) == NULL || + cbor.read != len || + cbor_isa_array(item) == false || + cbor_array_is_definite(item) == false || + cbor_array_size(item) != 3 || + (v = cbor_array_handle(item)) == NULL) + goto fail; + + if (unpack_int(v[0], &p->seed) < 0 || + unpack_int(v[1], &p->dev) < 0 || + unpack_blob(v[2], &p->wiredata) < 0) + goto fail; + + ok = 0; +fail: + if (ok < 0) { + free(p); + p = NULL; + } + + if (item) + cbor_decref(&item); + + return p; +} + +size_t +pack(uint8_t *ptr, size_t len, const struct param *p) +{ + cbor_item_t *argv[3], *array = NULL; + size_t cbor_alloc_len, cbor_len = 0; + unsigned char *cbor = NULL; + + memset(argv, 0, sizeof(argv)); + + if ((array = cbor_new_definite_array(3)) == NULL || + (argv[0] = pack_int(p->seed)) == NULL || + (argv[1] = pack_int(p->dev)) == NULL || + (argv[2] = pack_blob(&p->wiredata)) == NULL) + goto fail; + + for (size_t i = 0; i < 3; i++) + if (cbor_array_push(array, argv[i]) == false) + goto fail; + + if ((cbor_len = cbor_serialize_alloc(array, &cbor, + &cbor_alloc_len)) > len) { + cbor_len = 0; + goto fail; + } + + memcpy(ptr, cbor, cbor_len); +fail: + for (size_t i = 0; i < 3; i++) + if (argv[i]) + cbor_decref(&argv[i]); + + if (array) + cbor_decref(&array); + + free(cbor); + + return cbor_len; +} + +size_t +pack_dummy(uint8_t *ptr, size_t len) +{ + struct param dummy; + uint8_t blob[MAXCORPUS]; + size_t blob_len; + + memset(&dummy, 0, sizeof(dummy)); + + dummy.wiredata.len = sizeof(dummy_netlink_wiredata); + memcpy(&dummy.wiredata.body, &dummy_netlink_wiredata, + dummy.wiredata.len); + + assert((blob_len = pack(blob, sizeof(blob), &dummy)) != 0); + + if (blob_len > len) { + memcpy(ptr, blob, len); + return len; + } + + memcpy(ptr, blob, blob_len); + + return blob_len; +} + +void +test(const struct param *p) +{ + fido_nl_t *nl; + uint32_t target; + + prng_init((unsigned int)p->seed); + fuzz_clock_reset(); + fido_init(FIDO_DEBUG); + fido_set_log_handler(consume_str); + + set_netlink_io_functions(fd_read, fd_write); + set_wire_data(p->wiredata.body, p->wiredata.len); + + if ((nl = fido_nl_new()) == NULL) + return; + + consume(&nl->fd, sizeof(nl->fd)); + consume(&nl->nfc_type, sizeof(nl->nfc_type)); + consume(&nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)); + consume(&nl->saddr, sizeof(nl->saddr)); + + fido_nl_power_nfc(nl, (uint32_t)p->dev); + + if (fido_nl_get_nfc_target(nl, (uint32_t)p->dev, &target) == 0) + consume(&target, sizeof(target)); + + fido_nl_free(&nl); +} + +void +mutate(struct param *p, unsigned int seed, unsigned int flags) NO_MSAN +{ + if (flags & MUTATE_SEED) + p->seed = (int)seed; + + if (flags & MUTATE_PARAM) + mutate_int(&p->dev); + + if (flags & MUTATE_WIREDATA) + mutate_blob(&p->wiredata); +} |