// callback for tracing invalid memory access (READ or WRITE)
static bool hook_mem_invalid(uc_engine *uc, uc_mem_type type,
uint64_t addr, int size, int64_t value, void *user_data)
{
switch(type) {
default:
printf("not ok %d - memory invalid type: %d at 0x%" PRIx64 "\n", log_num++, type, addr);
return false;
case UC_MEM_FETCH_PROT:
printf("# Fetch from non-executable memory at 0x%"PRIx64 "\n", addr);
//make page executable
if (uc_mem_protect(uc, addr & ~0xfffL, 0x1000, UC_PROT_READ | UC_PROT_EXEC) != UC_ERR_OK) {
printf("not ok %d - uc_mem_protect fail for address: 0x%" PRIx64 "\n", log_num++, addr);
} else {
printf("ok %d - uc_mem_protect success at 0x%" PRIx64 "\n", log_num++, addr);
}
return true;
case UC_MEM_WRITE_PROT:
printf("# write to non-writeable memory at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
if (uc_mem_protect(uc, addr & ~0xfffL, 0x1000, UC_PROT_READ | UC_PROT_WRITE) != UC_ERR_OK) {
printf("not ok %d - uc_mem_protect fail during hook_mem_invalid callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
} else {
printf("ok %d - uc_mem_protect success\n", log_num++);
}
return true;
}
}
// callback for tracing instructions, detect HLT and terminate emulation
static void hook_code(uc_engine *uc, uint64_t addr, uint32_t size, void *user_data)
{
uint8_t opcode;
unsigned char buf[256];
insts_executed++;
if (uc_mem_read(uc, addr, buf, size) != UC_ERR_OK) {
printf("not ok - uc_mem_read fail during hook_code callback, addr: 0x%" PRIx64 "\n", addr);
if (uc_emu_stop(uc) != UC_ERR_OK) {
printf("not ok - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIx64 "\n", addr);
_exit(-1);
}
}
opcode = buf[0];
switch (opcode) {
case 0x41: // inc ecx
if (uc_mem_protect(uc, 0x101000, 0x1000, UC_PROT_READ) != UC_ERR_OK) {
printf("not ok - uc_mem_protect fail during hook_code callback, addr: 0x%" PRIx64 "\n", addr);
_exit(-1);
}
break;
case 0x42: // inc edx
if (uc_mem_unmap(uc, 0x101000, 0x1000) != UC_ERR_OK) {
printf("not ok - uc_mem_unmap fail during hook_code callback, addr: 0x%" PRIx64 "\n", addr);
_exit(-1);
}
break;
case 0xf4: // hlt
if (uc_emu_stop(uc) != UC_ERR_OK) {
printf("not ok - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIx64 "\n", addr);
_exit(-1);
}
break;
default: // all others
break;
}
}