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/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <bluetooth/log.h>
#include <fuzzer/FuzzedDataProvider.h>
#include <cstdint>
#include <functional>
#include <vector>
#include "osi/include/allocator.h"
#include "stack/include/bnep_api.h"
#include "test/fake/fake_osi.h"
#include "test/mock/mock_btif_config.h"
#include "test/mock/mock_stack_acl.h"
#include "test/mock/mock_stack_btm_dev.h"
#include "test/mock/mock_stack_l2cap_api.h"
#include "test/mock/mock_stack_l2cap_ble.h"
#include "types/bluetooth/uuid.h"
using bluetooth::Uuid;
namespace {
constexpr uint16_t kDummyCid = 0x1234;
constexpr uint8_t kDummyId = 0x77;
constexpr uint8_t kDummyRemoteAddr[] = {0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC};
constexpr uint8_t kDummySrcUuid[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
constexpr uint8_t kDummyDstUuid[] = {0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x55, 0x55, 0x55, 0x55, 0x55, 0x59};
// Set up default callback structure
static tL2CAP_APPL_INFO appl_info;
class FakeBtStack {
public:
FakeBtStack() {
test::mock::stack_l2cap_api::L2CA_DataWrite.body = [](uint16_t cid, BT_HDR* p_data) {
bluetooth::log::assert_that(cid == kDummyCid, "assert failed: cid == kDummyCid");
osi_free(p_data);
return tL2CAP_DW_RESULT::SUCCESS;
};
test::mock::stack_l2cap_api::L2CA_DisconnectReq.body = [](uint16_t cid) {
bluetooth::log::assert_that(cid == kDummyCid, "assert failed: cid == kDummyCid");
return true;
};
test::mock::stack_l2cap_api::L2CA_ConnectReqWithSecurity.body =
[](uint16_t psm, const RawAddress& p_bd_addr, uint16_t sec_level) {
bluetooth::log::assert_that(p_bd_addr == kDummyRemoteAddr,
"assert failed: p_bd_addr == kDummyRemoteAddr");
return kDummyCid;
};
test::mock::stack_l2cap_api::L2CA_RegisterWithSecurity.body =
[](uint16_t psm, const tL2CAP_APPL_INFO& p_cb_info, bool enable_snoop,
tL2CAP_ERTM_INFO* p_ertm_info, uint16_t my_mtu, uint16_t required_remote_mtu,
uint16_t sec_level) {
appl_info = p_cb_info;
return psm;
};
test::mock::stack_l2cap_api::L2CA_Deregister.body = [](uint16_t psm) {};
}
~FakeBtStack() {
test::mock::stack_l2cap_api::L2CA_DataWrite = {};
test::mock::stack_l2cap_api::L2CA_ConnectReqWithSecurity = {};
test::mock::stack_l2cap_api::L2CA_DisconnectReq = {};
test::mock::stack_l2cap_api::L2CA_RegisterWithSecurity = {};
test::mock::stack_l2cap_api::L2CA_Deregister = {};
}
};
class Fakes {
public:
test::fake::FakeOsi fake_osi;
FakeBtStack fake_stack;
};
} // namespace
// Verify the passed data is readable
static void ConsumeData(const uint8_t* data, size_t size) {
volatile uint8_t checksum = 0;
for (size_t i = 0; i < size; i++) {
checksum ^= data[i];
}
}
static void Fuzz(const uint8_t* data, size_t size) {
tBNEP_REGISTER reg = {
.p_conn_ind_cb = [](uint16_t handle, const RawAddress& bd_addr,
const bluetooth::Uuid& remote_uuid, const bluetooth::Uuid& local_uuid,
bool is_role_change) { BNEP_ConnectResp(handle, BNEP_SUCCESS); },
.p_conn_state_cb = [](uint16_t handle, const RawAddress& rem_bda, tBNEP_RESULT result,
bool is_role_change) {},
.p_data_ind_cb = [](uint16_t handle, const RawAddress& src, const RawAddress& dst,
uint16_t protocol, uint8_t* p_data, uint16_t len,
bool fw_ext_present) { ConsumeData(p_data, len); },
.p_tx_data_flow_cb = [](uint16_t handle, tBNEP_RESULT event) {},
.p_filter_ind_cb = [](uint16_t handle, bool indication, tBNEP_RESULT result,
uint16_t num_filters,
uint8_t* p_filters) { ConsumeData(p_filters, num_filters); },
.p_mfilter_ind_cb = [](uint16_t handle, bool indication, tBNEP_RESULT result,
uint16_t num_mfilters,
uint8_t* p_mfilters) { ConsumeData(p_mfilters, num_mfilters); },
};
BNEP_Init();
if (BNEP_SUCCESS != BNEP_Register(®)) {
return;
}
FuzzedDataProvider fdp(data, size);
bool is_server = fdp.ConsumeBool();
if (is_server) {
// Simulating an inbound connection event
appl_info.pL2CA_ConnectInd_Cb(kDummyRemoteAddr, kDummyCid, 0, kDummyId);
} else {
// Initiating an outbound connection
uint16_t handle;
BNEP_Connect(kDummyRemoteAddr, Uuid::From128BitBE(kDummySrcUuid),
Uuid::From128BitBE(kDummyDstUuid), &handle, 0);
// Simulating outbound connection confirm event
appl_info.pL2CA_ConnectCfm_Cb(kDummyCid, tL2CAP_CONN::L2CAP_CONN_OK);
}
// Simulating configuration confirmation event
tL2CAP_CFG_INFO cfg = {};
appl_info.pL2CA_ConfigCfm_Cb(kDummyCid, 0, &cfg);
// Feeding input packets
constexpr uint16_t kMaxPacketSize = 1024;
while (fdp.remaining_bytes() > 0) {
auto size = fdp.ConsumeIntegralInRange<uint16_t>(0, kMaxPacketSize);
auto bytes = fdp.ConsumeBytes<uint8_t>(size);
BT_HDR* hdr = (BT_HDR*)osi_calloc(sizeof(BT_HDR) + bytes.size());
hdr->len = bytes.size();
std::copy(bytes.cbegin(), bytes.cend(), hdr->data);
appl_info.pL2CA_DataInd_Cb(kDummyCid, hdr);
}
// Simulating disconnecting event
appl_info.pL2CA_DisconnectInd_Cb(kDummyCid, false);
BNEP_Deregister();
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) {
auto fakes = std::make_unique<Fakes>();
Fuzz(Data, Size);
return 0;
}
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