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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 <fuzzer/FuzzedDataProvider.h>
#include <cstdint>
#include <functional>
#include <vector>
#include "common/message_loop_thread.h"
#include "osi/include/allocator.h"
#include "stack/include/bt_hdr.h"
#include "stack/include/btm_status.h"
#include "stack/include/smp_api.h"
#include "stack/smp/smp_int.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"
bluetooth::common::MessageLoopThread* main_thread_ptr = nullptr;
bluetooth::common::MessageLoopThread* get_main_thread() { return main_thread_ptr; }
namespace {
#define SDP_DB_SIZE 0x10000
constexpr uint8_t kDummyAddr[] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66};
constexpr uint8_t kDummyRemoteAddr[] = {0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC};
// Set up default callback structure
tL2CAP_FIXED_CHNL_REG fixed_chnl_reg = {
.pL2CA_FixedConn_Cb = [](uint16_t, const RawAddress&, bool, uint16_t, tBT_TRANSPORT) {},
.pL2CA_FixedData_Cb = [](uint16_t, const RawAddress&, BT_HDR*) {},
};
tL2CAP_FIXED_CHNL_REG fixed_chnl_br_reg = {
.pL2CA_FixedConn_Cb = [](uint16_t, const RawAddress&, bool, uint16_t, tBT_TRANSPORT) {},
.pL2CA_FixedData_Cb = [](uint16_t, const RawAddress&, BT_HDR*) {},
};
tBTM_SEC_DEV_REC dev_rec;
bool is_peripheral;
class FakeBtStack {
public:
FakeBtStack() {
test::mock::stack_acl::BTM_ReadConnectionAddr.body =
[](const RawAddress& remote_bda, RawAddress& local_conn_addr,
tBLE_ADDR_TYPE* p_addr_type, bool ota_address) {
local_conn_addr = kDummyAddr;
*p_addr_type = BLE_ADDR_PUBLIC;
};
test::mock::stack_acl::BTM_ReadRemoteConnectionAddr.body =
[](const RawAddress& pseudo_addr, RawAddress& conn_addr, tBLE_ADDR_TYPE* p_addr_type,
bool ota_address) {
conn_addr = kDummyRemoteAddr;
*p_addr_type = BLE_ADDR_PUBLIC;
return true;
};
test::mock::stack_btm_dev::btm_find_dev.body = [](const RawAddress&) { return &dev_rec; };
test::mock::stack_l2cap_ble::L2CA_GetBleConnRole.body = [](const RawAddress&) {
return is_peripheral ? HCI_ROLE_PERIPHERAL : HCI_ROLE_CENTRAL;
};
test::mock::stack_l2cap_api::L2CA_SetIdleTimeoutByBdAddr.body = [](const RawAddress&, uint16_t,
uint8_t) { return true; };
test::mock::stack_l2cap_api::L2CA_RemoveFixedChnl.body = [](uint16_t, const RawAddress&) {
return true;
};
test::mock::stack_l2cap_api::L2CA_ConnectFixedChnl.body = [](uint16_t, const RawAddress&) {
return true;
};
test::mock::stack_l2cap_api::L2CA_SendFixedChnlData.body =
[](uint16_t cid, const RawAddress& addr, BT_HDR* hdr) {
osi_free(hdr);
return tL2CAP_DW_RESULT::SUCCESS;
};
test::mock::stack_l2cap_api::L2CA_RegisterFixedChannel.body =
[](uint16_t fixed_cid, tL2CAP_FIXED_CHNL_REG* p_freg) {
if (fixed_cid == L2CAP_SMP_CID) {
fixed_chnl_reg = *p_freg;
} else if (fixed_cid == L2CAP_SMP_BR_CID) {
fixed_chnl_br_reg = *p_freg;
} else {
abort();
}
return true;
};
main_thread_ptr = new bluetooth::common::MessageLoopThread("smp_fuzz_main_thread");
main_thread_ptr->StartUp();
}
~FakeBtStack() {
test::mock::stack_acl::BTM_ReadConnectionAddr = {};
test::mock::stack_acl::BTM_ReadRemoteConnectionAddr = {};
test::mock::stack_btm_dev::btm_find_dev = {};
test::mock::stack_l2cap_ble::L2CA_GetBleConnRole = {};
test::mock::stack_l2cap_api::L2CA_SetIdleTimeoutByBdAddr = {};
test::mock::stack_l2cap_api::L2CA_RemoveFixedChnl = {};
test::mock::stack_l2cap_api::L2CA_ConnectFixedChnl = {};
test::mock::stack_l2cap_api::L2CA_SendFixedChnlData = {};
test::mock::stack_l2cap_api::L2CA_RegisterFixedChannel = {};
main_thread_ptr->ShutDown();
delete main_thread_ptr;
main_thread_ptr = nullptr;
}
};
class Fakes {
public:
test::fake::FakeOsi fake_osi;
FakeBtStack fake_stack;
};
} // namespace
uint8_t oob_data[] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88,
0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x00};
tSMP_IO_REQ io_req = {};
tBTM_STATUS smp_callback(tSMP_EVT event, const RawAddress& bd_addr, tSMP_EVT_DATA* p_data) {
switch (event) {
case SMP_IO_CAP_REQ_EVT:
case SMP_BR_KEYS_REQ_EVT: {
tSMP_IO_REQ* p_req = (tSMP_IO_REQ*)p_data;
memcpy(p_req, &io_req, sizeof(io_req));
} break;
case SMP_PASSKEY_REQ_EVT: {
SMP_PasskeyReply(kDummyAddr, SMP_SUCCESS, 1234);
} break;
case SMP_NC_REQ_EVT: {
SMP_ConfirmReply(kDummyAddr, SMP_SUCCESS);
} break;
case SMP_OOB_REQ_EVT: {
SMP_OobDataReply(kDummyAddr, SMP_SUCCESS, sizeof(oob_data), oob_data);
} break;
case SMP_SC_OOB_REQ_EVT: {
tSMP_SC_OOB_DATA oob_data = {};
SMP_SecureConnectionOobDataReply((uint8_t*)&oob_data);
} break;
case SMP_CONSENT_REQ_EVT: {
SMP_SecurityGrant(kDummyAddr, SMP_SUCCESS);
} break;
default:
break;
}
return tBTM_STATUS::BTM_SUCCESS;
}
void Fuzz(const uint8_t* data, size_t size) {
FuzzedDataProvider fdp(data, size);
uint16_t cid;
tBT_TRANSPORT transport;
tL2CAP_FIXED_CHNL_REG* chnl_reg;
SMP_Init(BTM_SEC_MODE_SP);
SMP_Register(smp_callback);
SMP_ClearLocScOobData();
auto is_br = fdp.ConsumeBool();
auto is_initiator = fdp.ConsumeBool();
is_peripheral = fdp.ConsumeBool();
fdp.ConsumeData(&io_req, sizeof(io_req));
if (is_br) {
cid = L2CAP_SMP_BR_CID;
chnl_reg = &fixed_chnl_br_reg;
transport = BT_TRANSPORT_BR_EDR;
if (is_initiator) {
SMP_BR_PairWith(kDummyAddr);
}
} else {
cid = L2CAP_SMP_CID;
chnl_reg = &fixed_chnl_reg;
transport = BT_TRANSPORT_LE;
if (is_initiator) {
SMP_Pair(kDummyAddr);
}
}
// Simulating connection establaishing event
chnl_reg->pL2CA_FixedConn_Cb(cid, kDummyAddr, true, 0, transport);
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);
// Simulating incoming data packet event
chnl_reg->pL2CA_FixedData_Cb(cid, kDummyAddr, hdr);
}
// Simulating disconnecting event
chnl_reg->pL2CA_FixedConn_Cb(cid, kDummyAddr, false, 0, transport);
// Final cleanups to avoid memory leak
alarm_free(smp_cb.smp_rsp_timer_ent);
alarm_free(smp_cb.delayed_auth_timer_ent);
}
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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