297 lines
9.1 KiB
C
297 lines
9.1 KiB
C
/*
|
|
|
|
Executable memory regions demo / unit test
|
|
|
|
Copyright(c) 2015 Chris Eagle
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
version 2 as published by the Free Software Foundation.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
|
|
*/
|
|
|
|
#define __STDC_FORMAT_MACROS
|
|
#include <inttypes.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include <unicorn/unicorn.h>
|
|
|
|
unsigned char PROGRAM[] =
|
|
"\xeb\x45\x5e\x81\xe6\x00\xf0\xff\xff\x40\x40\x40\x40\x40\x40\x40"
|
|
"\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40"
|
|
"\x40\x40\x40\x40\x40\x40\x40\x89\xf7\x81\xc7\x00\x00\x10\x00\xb9"
|
|
"\x4c\x00\x00\x00\x81\xff\x00\x00\x40\x00\x75\x01\xf4\xf3\xa4\x81"
|
|
"\xe7\x00\xf0\xff\xff\xff\xe7\xe8\xb6\xff\xff\xff";
|
|
// total size: 76 bytes
|
|
|
|
/*
|
|
bits 32
|
|
|
|
; assumes r-x section at 0x100000
|
|
; assumes rw- section at 0x200000
|
|
; assumes r-- section at 0x300000
|
|
; also needs an initialized stack
|
|
|
|
start:
|
|
jmp bottom
|
|
top:
|
|
pop esi
|
|
and esi, ~0xfff
|
|
times 30 inc eax
|
|
mov edi, esi
|
|
add edi, 0x100000
|
|
mov ecx, end - start
|
|
rep movsb
|
|
and edi, ~0xfff
|
|
cmp edi, 0x400000
|
|
jnz next_block
|
|
hlt
|
|
next_block:
|
|
jmp edi
|
|
bottom:
|
|
call top
|
|
end:
|
|
*/
|
|
|
|
int test_num = 0;
|
|
uint32_t tests[] = {
|
|
0x41414141,
|
|
0x43434343,
|
|
0x45454545
|
|
};
|
|
|
|
static int log_num = 1;
|
|
|
|
#define CODE_SECTION 0x100000
|
|
#define CODE_SIZE 0x1000
|
|
|
|
// callback for tracing instruction
|
|
static void hook_code(uch handle, uint64_t addr, uint32_t size, void *user_data)
|
|
{
|
|
uint8_t opcode;
|
|
if (uc_mem_read(handle, addr, &opcode, 1) != UC_ERR_OK) {
|
|
printf("not ok %d - uc_mem_read fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
|
|
}
|
|
// printf("ok %d - uc_mem_read for opcode at address 0x%" PRIx64 "\n", log_num++, addr);
|
|
switch (opcode) {
|
|
case 0xf4: //hlt
|
|
printf("# Handling HLT\n");
|
|
if (uc_emu_stop(handle) != UC_ERR_OK) {
|
|
printf("not ok %d - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
|
|
_exit(-1);
|
|
}
|
|
else {
|
|
printf("ok %d - hlt encountered, uc_emu_stop called\n", log_num++);
|
|
}
|
|
break;
|
|
default: //all others
|
|
// printf("# Handling OTHER\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
// callback for tracing memory access (READ or WRITE)
|
|
static void hook_mem_write(uch handle, uc_mem_type type,
|
|
uint64_t addr, int size, int64_t value, void *user_data)
|
|
{
|
|
printf("# write to memory at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
|
|
}
|
|
|
|
// callback for tracing invalid memory access (READ or WRITE)
|
|
static bool hook_mem_invalid(uch handle, uc_mem_type type,
|
|
uint64_t addr, int size, int64_t value, void *user_data)
|
|
{
|
|
switch(type) {
|
|
default:
|
|
printf("not ok %d - UC_HOOK_MEM_INVALID type: %d at 0x%" PRIx64 "\n", log_num++, type, addr);
|
|
return false;
|
|
case UC_MEM_EXEC_PROT:
|
|
printf("# Fetch from non-executable memory at 0x%"PRIx64 "\n", addr);
|
|
|
|
//make page executable
|
|
if (uc_mem_protect(handle, 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(handle, 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;
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv, char **envp)
|
|
{
|
|
uch handle, trace1, trace2;
|
|
uc_err err;
|
|
uint32_t esp, eip;
|
|
int32_t buf1[1024], buf2[1024], readbuf[1024];
|
|
int i;
|
|
|
|
//don't really care about quality of randomness
|
|
srand(time(NULL));
|
|
for (i = 0; i < 1024; i++) {
|
|
buf1[i] = rand();
|
|
buf2[i] = rand();
|
|
}
|
|
|
|
printf("# Memory protect test\n");
|
|
|
|
// Initialize emulator in X86-32bit mode
|
|
err = uc_open(UC_ARCH_X86, UC_MODE_32, &handle);
|
|
if (err) {
|
|
printf("not ok %d - Failed on uc_open() with error returned: %u\n", log_num++, err);
|
|
return 1;
|
|
}
|
|
else {
|
|
printf("ok %d - uc_open() success\n", log_num++);
|
|
}
|
|
|
|
uc_mem_map(handle, 0x100000, 0x1000, UC_PROT_READ | UC_PROT_EXEC);
|
|
uc_mem_map(handle, 0x1ff000, 0x2000, UC_PROT_READ | UC_PROT_WRITE);
|
|
uc_mem_map(handle, 0x300000, 0x2000, UC_PROT_READ);
|
|
uc_mem_map(handle, 0xf00000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
|
|
|
|
esp = 0xf00000 + 0x1000;
|
|
|
|
// Setup stack pointer
|
|
if (uc_reg_write(handle, UC_X86_REG_ESP, &esp)) {
|
|
printf("not ok %d - Failed to set esp. quit!\n", log_num++);
|
|
return 2;
|
|
}
|
|
else {
|
|
printf("ok %d - ESP set\n", log_num++);
|
|
}
|
|
|
|
// fill in sections that shouldn't get touched
|
|
if (uc_mem_write(handle, 0x1ff000, (uint8_t*)buf1, 4096)) {
|
|
printf("not ok %d - Failed to write random buffer 1 to memory, quit!\n", log_num++);
|
|
return 3;
|
|
}
|
|
else {
|
|
printf("ok %d - Random buffer 1 written to memory\n", log_num++);
|
|
}
|
|
|
|
if (uc_mem_write(handle, 0x301000, (uint8_t*)buf2, 4096)) {
|
|
printf("not ok %d - Failed to write random buffer 2 to memory, quit!\n", log_num++);
|
|
return 4;
|
|
}
|
|
else {
|
|
printf("ok %d - Random buffer 2 written to memory\n", log_num++);
|
|
}
|
|
|
|
// write machine code to be emulated to memory
|
|
if (uc_mem_write(handle, 0x100000, PROGRAM, sizeof(PROGRAM))) {
|
|
printf("not ok %d - Failed to write emulation code to memory, quit!\n", log_num++);
|
|
return 5;
|
|
}
|
|
else {
|
|
printf("ok %d - Program written to memory\n", log_num++);
|
|
}
|
|
|
|
if (uc_hook_add(handle, &trace2, UC_HOOK_CODE, hook_code, NULL, 1, 0) != UC_ERR_OK) {
|
|
printf("not ok %d - Failed to install UC_HOOK_CODE handler\n", log_num++);
|
|
return 6;
|
|
}
|
|
else {
|
|
printf("ok %d - UC_HOOK_CODE installed\n", log_num++);
|
|
}
|
|
|
|
// intercept memory write events
|
|
if (uc_hook_add(handle, &trace1, UC_HOOK_MEM_WRITE, hook_mem_write, NULL) != UC_ERR_OK) {
|
|
printf("not ok %d - Failed to install UC_HOOK_MEM_WRITE handler\n", log_num++);
|
|
return 7;
|
|
}
|
|
else {
|
|
printf("ok %d - UC_HOOK_MEM_WRITE installed\n", log_num++);
|
|
}
|
|
|
|
// intercept invalid memory events
|
|
if (uc_hook_add(handle, &trace1, UC_HOOK_MEM_INVALID, hook_mem_invalid, NULL) != UC_ERR_OK) {
|
|
printf("not ok %d - Failed to install UC_HOOK_MEM_INVALID handler\n", log_num++);
|
|
return 8;
|
|
}
|
|
else {
|
|
printf("ok %d - UC_HOOK_MEM_INVALID installed\n", log_num++);
|
|
}
|
|
|
|
// emulate machine code until told to stop by hook_code
|
|
printf("# BEGIN execution\n");
|
|
err = uc_emu_start(handle, 0x100000, 0x400000, 0, 0);
|
|
if (err != UC_ERR_OK) {
|
|
printf("not ok %d - Failure on uc_emu_start() with error %u:%s\n", log_num++, err, uc_strerror(err));
|
|
return 9;
|
|
}
|
|
else {
|
|
printf("ok %d - uc_emu_start complete\n", log_num++);
|
|
}
|
|
printf("# END execution\n");
|
|
|
|
// get ending EIP
|
|
if (uc_reg_read(handle, UC_X86_REG_EIP, &eip)) {
|
|
printf("not ok %d - Failed to read eip.\n", log_num++);
|
|
}
|
|
else {
|
|
printf("ok %d - Ending EIP 0x%x\n", log_num++, eip);
|
|
}
|
|
|
|
//make sure that random blocks didn't get nuked
|
|
// fill in sections that shouldn't get touched
|
|
if (uc_mem_read(handle, 0x1ff000, (uint8_t*)readbuf, 4096)) {
|
|
printf("not ok %d - Failed to read random buffer 1 from memory\n", log_num++);
|
|
}
|
|
else {
|
|
printf("ok %d - Random buffer 1 read from memory\n", log_num++);
|
|
if (memcmp(buf1, readbuf, 4096)) {
|
|
printf("not ok %d - Random buffer 1 contents are incorrect\n", log_num++);
|
|
}
|
|
else {
|
|
printf("ok %d - Random buffer 1 contents are correct\n", log_num++);
|
|
}
|
|
}
|
|
|
|
if (uc_mem_read(handle, 0x301000, (uint8_t*)readbuf, 4096)) {
|
|
printf("not ok %d - Failed to read random buffer 2 from memory\n", log_num++);
|
|
}
|
|
else {
|
|
printf("ok %d - Random buffer 2 read from memory\n", log_num++);
|
|
if (memcmp(buf2, readbuf, 4096)) {
|
|
printf("not ok %d - Random buffer 2 contents are incorrect\n", log_num++);
|
|
}
|
|
else {
|
|
printf("ok %d - Random buffer 2 contents are correct\n", log_num++);
|
|
}
|
|
}
|
|
|
|
if (uc_close(&handle) == UC_ERR_OK) {
|
|
printf("ok %d - uc_close complete\n", log_num++);
|
|
}
|
|
else {
|
|
printf("not ok %d - uc_close complete\n", log_num++);
|
|
}
|
|
|
|
return 0;
|
|
}
|