103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* Following files are taken as reference to come up with this PoC */
|
|
/* 1. 'system/nfc/src/fuzzers/fuzz_utils.cc' */
|
|
/* 2. 'system/nfc/src/fuzzers/rw/main.cc' */
|
|
|
|
#include <vector>
|
|
#include "../includes/common.h"
|
|
#include "fuzz.h"
|
|
#include "fuzz_cmn.h"
|
|
extern void Type4_Fuzz(uint8_t SubType, const std::vector<bytes_t> &Packets);
|
|
|
|
FILE *file = nullptr;
|
|
char *vulnPtr = nullptr;
|
|
bool testInProgress = false;
|
|
|
|
struct sigaction new_action, old_action;
|
|
void sigsegv_handler(int signum, siginfo_t *info, void *context) {
|
|
if (testInProgress && info->si_signo == SIGSEGV) {
|
|
size_t pageSize = getpagesize();
|
|
if (pageSize) {
|
|
char *vulnPtrGuardPage = (char *)((size_t)vulnPtr & PAGE_MASK) + pageSize;
|
|
char *faultPage = (char *)((size_t)info->si_addr & PAGE_MASK);
|
|
if (faultPage == vulnPtrGuardPage) {
|
|
(*old_action.sa_sigaction)(signum, info, context);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
void exit_Handler(void) {
|
|
if (file) {
|
|
fclose(file);
|
|
}
|
|
}
|
|
|
|
static std::vector<bytes_t> UnpackPackets(const uint8_t *Data, size_t Size) {
|
|
std::vector<bytes_t> result;
|
|
while (Size > 0) {
|
|
auto s = *Data++;
|
|
Size--;
|
|
|
|
if (s > Size) {
|
|
s = Size;
|
|
}
|
|
|
|
if (s > 0) {
|
|
result.push_back(bytes_t(Data, Data + s));
|
|
}
|
|
|
|
Size -= s;
|
|
Data += s;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
sigemptyset(&new_action.sa_mask);
|
|
new_action.sa_flags = SA_SIGINFO;
|
|
new_action.sa_sigaction = sigsegv_handler;
|
|
sigaction(SIGSEGV, &new_action, &old_action);
|
|
FAIL_CHECK(argc > 1);
|
|
|
|
file = fopen(argv[1], "r");
|
|
FAIL_CHECK(file);
|
|
|
|
fseek(file, 0, SEEK_END);
|
|
size_t size = ftell(file);
|
|
fseek(file, 0, SEEK_SET);
|
|
|
|
std::vector<uint8_t> bufVector(size);
|
|
FAIL_CHECK(bufVector.data());
|
|
FAIL_CHECK(fread(bufVector.data(), 1, size, file) == size);
|
|
|
|
const uint8_t *data = (const uint8_t *)bufVector.data();
|
|
auto Packets = UnpackPackets(data, size);
|
|
FAIL_CHECK(Packets.size() > 1);
|
|
|
|
auto &ctrl = Packets[0];
|
|
FAIL_CHECK(ctrl.size() > 1);
|
|
|
|
Type4_Fuzz(ctrl[1], Packets);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|