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unicorn/tests/regress/mem_exec.c

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/*
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 "platform.h"
#include <string.h>
#include "platform.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(uc_engine *uc, uint64_t addr, uint32_t size, void *user_data)
{
uint8_t opcode;
if (uc_mem_read(uc, 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(uc) != 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(uc_engine *uc, 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(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;
}
}
int main(int argc, char **argv, char **envp)
{
uc_engine *uc;
uc_hook 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, &uc);
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(uc, 0x100000, 0x1000, UC_PROT_READ | UC_PROT_EXEC);
uc_mem_map(uc, 0x1ff000, 0x2000, UC_PROT_READ | UC_PROT_WRITE);
uc_mem_map(uc, 0x300000, 0x2000, UC_PROT_READ);
uc_mem_map(uc, 0xf00000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
esp = 0xf00000 + 0x1000;
// Setup stack pointer
if (uc_reg_write(uc, 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(uc, 0x1ff000, buf1, sizeof(buf1))) {
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(uc, 0x301000, buf2, sizeof(buf2))) {
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(uc, 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(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, 1, 0) != UC_ERR_OK) {
printf("not ok %d - Failed to install UC_HOOK_CODE ucr\n", log_num++);
return 6;
} else {
printf("ok %d - UC_HOOK_CODE installed\n", log_num++);
}
// intercept memory write events
if (uc_hook_add(uc, &trace1, UC_HOOK_MEM_WRITE, hook_mem_write, NULL, 1, 0) != UC_ERR_OK) {
printf("not ok %d - Failed to install UC_HOOK_MEM_WRITE ucr\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(uc, &trace1, UC_HOOK_MEM_WRITE_PROT | UC_HOOK_MEM_FETCH_PROT, hook_mem_invalid, NULL, 1, 0) != UC_ERR_OK) {
printf("not ok %d - Failed to install memory invalid handler\n", log_num++);
return 8;
} else {
printf("ok %d - memory invalid handler installed\n", log_num++);
}
// emulate machine code until told to stop by hook_code
printf("# BEGIN execution\n");
err = uc_emu_start(uc, 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(uc, 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(uc, 0x1ff000, readbuf, sizeof(readbuf))) {
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(uc, 0x301000, readbuf, sizeof(readbuf))) {
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(uc) == 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;
}
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