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/*
* Copyright (C) 2021 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.
*/
/* 'system/nfc/src/fuzzers/rw/t4t.cc' is used as reference to come up with file */
#include "fuzz.h"
#include "../includes/memutils.h"
char enable_selective_overload = ENABLE_NONE;
extern bool testInProgress;
extern char* vulnPtr;
#define MODULE_NAME "Type4 Read/Write"
enum {
SUB_TYPE_DETECT_NDEF,
SUB_TYPE_READ_NDEF,
SUB_TYPE_UPDATE_NDEF,
SUB_TYPE_PRESENCE_CHECK,
SUB_TYPE_SET_READ_ONLY,
SUB_TYPE_FORMAT_NDEF,
SUB_TYPE_MAX
};
static void rw_cback(tRW_EVENT event, tRW_DATA* p_rw_data) {
FUZZLOG(MODULE_NAME ": rw_cback: event=0x%02x, p_rw_data=%p", event, p_rw_data);
if (event == RW_T4T_RAW_FRAME_EVT) {
if (p_rw_data->raw_frame.p_data) {
GKI_freebuf(p_rw_data->raw_frame.p_data);
p_rw_data->raw_frame.p_data = nullptr;
}
} else if (event == RW_T4T_NDEF_READ_EVT || event == RW_T4T_NDEF_READ_CPLT_EVT) {
if (p_rw_data->data.p_data) {
GKI_freebuf(p_rw_data->data.p_data);
p_rw_data->data.p_data = nullptr;
}
}
}
#define TEST_NFCID_VALUE \
{ 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88 }
static bool Init(Fuzz_Context& /*ctx*/) {
tNFC_ACTIVATE_DEVT activate_params = {.protocol = NFC_PROTOCOL_ISO_DEP,
.rf_tech_param = {
.mode = NFC_DISCOVERY_TYPE_POLL_A,
}};
rw_init();
if (NFC_STATUS_OK != RW_SetActivatedTagType(&activate_params, rw_cback)) {
FUZZLOG(MODULE_NAME ": RW_SetActivatedTagType failed");
return false;
}
return true;
}
static bool Init_PresenceCheck(Fuzz_Context& /*ctx*/) {
return NFC_STATUS_OK == RW_T4tPresenceCheck(1);
}
static bool Init_DetectNDef(Fuzz_Context& /*ctx*/) {
return NFC_STATUS_OK == RW_T4tDetectNDef();
}
static bool Init_ReadNDef(Fuzz_Context& /*ctx*/) {
return NFC_STATUS_OK == RW_T4tReadNDef();
}
static bool Init_UpdateNDef(Fuzz_Context& ctx) {
const uint8_t data[] = {0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04,
0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04};
auto scratch = ctx.GetBuffer(sizeof(data), data);
return NFC_STATUS_OK == RW_T4tUpdateNDef(sizeof(data), scratch);
}
static bool Init_FormatNDef(Fuzz_Context& /*ctx*/) {
return NFC_STATUS_OK == RW_T4tFormatNDef();
}
static bool Init_SetNDefReadOnly(Fuzz_Context& /*ctx*/) {
return NFC_STATUS_OK == RW_T4tSetNDefReadOnly();
}
static bool Fuzz_Init(Fuzz_Context& ctx) {
if (!Init(ctx)) {
FUZZLOG(MODULE_NAME ": initialization failed");
return false;
}
bool result = false;
switch (ctx.SubType) {
case SUB_TYPE_DETECT_NDEF:
result = Init_DetectNDef(ctx);
break;
case SUB_TYPE_UPDATE_NDEF:
result = Init_UpdateNDef(ctx);
break;
case SUB_TYPE_PRESENCE_CHECK:
result = Init_PresenceCheck(ctx);
break;
case SUB_TYPE_READ_NDEF:
result = Init_ReadNDef(ctx);
break;
case SUB_TYPE_FORMAT_NDEF:
result = Init_FormatNDef(ctx);
break;
case SUB_TYPE_SET_READ_ONLY:
result = Init_SetNDefReadOnly(ctx);
break;
default:
FUZZLOG(MODULE_NAME ": Unknown command %d", ctx.SubType);
result = false;
break;
}
if (!result) {
FUZZLOG(MODULE_NAME ": Initializing command %02X failed", ctx.SubType);
}
return result;
}
static void Fuzz_Deinit(Fuzz_Context& /*ctx*/) {
if (rf_cback) {
tNFC_CONN conn = {.deactivate = {.status = NFC_STATUS_OK,
.type = NFC_DEACTIVATE_TYPE_IDLE,
.is_ntf = true,
.reason = NFC_DEACTIVATE_REASON_DH_REQ_FAILED}};
rf_cback(NFC_RF_CONN_ID, NFC_DEACTIVATE_CEVT, &conn);
}
}
static void Fuzz_Run(Fuzz_Context& ctx) {
for (auto it = ctx.Data.cbegin() + 1; it != ctx.Data.cend(); ++it) {
NFC_HDR* p_msg;
/* CVE-2021-0925 starts */
enable_selective_overload = ENABLE_ALL;
/* CVE-2021-0925 ends */
p_msg = (NFC_HDR*)GKI_getbuf(sizeof(NFC_HDR) + it->size());
/* CVE-2021-0925 starts */
vulnPtr = (char*)p_msg;
enable_selective_overload = ENABLE_FREE_CHECK | ENABLE_REALLOC_CHECK;
/* CVE-2021-0925 ends */
if (p_msg == nullptr) {
FUZZLOG(MODULE_NAME ": GKI_getbuf returns null, size=%zu", it->size());
return;
}
/* Initialize NFC_HDR */
p_msg->len = it->size();
p_msg->offset = 0;
uint8_t* p = (uint8_t*)(p_msg + 1) + p_msg->offset;
memcpy(p, it->data(), it->size());
tNFC_CONN conn = {.data = {
.status = NFC_STATUS_OK,
.p_data = p_msg,
}};
FUZZLOG(MODULE_NAME ": SubType=%02X, Response[%zd/%zd]=%s", ctx.SubType,
it - ctx.Data.cbegin(), ctx.Data.size() - 1, BytesToHex(*it).c_str());
/* CVE-2021-0925 starts */
testInProgress = true;
/* CVE-2021-0925 ends */
rf_cback(NFC_RF_CONN_ID, NFC_DATA_CEVT, &conn);
/* CVE-2021-0925 starts */
testInProgress = false;
/* CVE-2021-0925 ends */
}
}
void Type4_FixPackets(uint8_t /*SubType*/, std::vector<bytes_t>& /*Data*/) {}
void Type4_Fuzz(uint8_t SubType, const std::vector<bytes_t>& Data) {
Fuzz_Context ctx(SubType % SUB_TYPE_MAX, Data);
if (Fuzz_Init(ctx)) {
Fuzz_Run(ctx);
}
Fuzz_Deinit(ctx);
}
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