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unicorn/tests/regress/mem_protect.c

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/*
uc_mem_protect 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 <string.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unicorn/unicorn.h>
unsigned char PROGRAM[] =
"\xc7\x05\x00\x00\x20\x00\x41\x41\x41\x41\x90\xc7\x05\x00\x00\x20"
"\x00\x42\x42\x42\x42\xc7\x05\x00\x00\x30\x00\x43\x43\x43\x43\x90"
"\xc7\x05\x00\x00\x30\x00\x44\x44\x44\x44\xc7\x05\x00\x00\x40\x00"
"\x45\x45\x45\x45\x90\xc7\x05\x00\x00\x40\x00\x46\x46\x46\x46\xc7"
"\x05\x00\xf8\x3f\x00\x47\x47\x47\x47\xc7\x05\x00\x18\x40\x00\x48"
"\x48\x48\x48\xf4";
// total size: 84 bytes
/*
bits 32
; assumes code section at 0x100000
; assumes data section at 0x200000, initially rw
; assumes data section at 0x300000, initially rw
; assumes data section at 0x400000, initially rw
; with installed hooks unmaps or maps on each nop
mov dword [0x200000], 0x41414141
nop ; mark it RO
mov dword [0x200000], 0x42424242
mov dword [0x300000], 0x43434343
nop ; mark it RO
mov dword [0x300000], 0x44444444
mov dword [0x400000], 0x45454545
nop ; mark it RO
mov dword [0x400000], 0x46464646
mov dword [0x3ff800], 0x47474747 ; make sure surrounding areas remained RW
mov dword [0x401800], 0x48484848 ; make sure surrounding areas remained RW
hlt ; tell hook function we are done
*/
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;
uint32_t testval;
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 0x90: //nop
printf("# Handling NOP\n");
if (uc_mem_read(uc, 0x200000 + test_num * 0x100000, &testval, sizeof(testval)) != UC_ERR_OK) {
printf("not ok %d - uc_mem_read fail for address: 0x%x\n", log_num++, 0x200000 + test_num * 0x100000);
} else {
printf("ok %d - good uc_mem_read for address: 0x%x\n", log_num++, 0x200000 + test_num * 0x100000);
printf("# uc_mem_read for test %d\n", test_num);
if (testval == tests[test_num]) {
printf("ok %d - passed test %d\n", log_num++, test_num);
} else {
printf("not ok %d - failed test %d\n", log_num++, test_num);
printf("# Expected: 0x%x\n",tests[test_num]);
printf("# Received: 0x%x\n", testval);
}
}
if (uc_mem_protect(uc, 0x200000 + test_num * 0x100000, 0x1000, UC_PROT_READ) != UC_ERR_OK) {
printf("not ok %d - uc_mem_protect fail during hook_code callback, addr: 0x%x\n", log_num++, 0x200000 + test_num * 0x100000);
} else {
printf("ok %d - uc_mem_protect success\n", log_num++);
}
test_num++;
break;
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)
{
uint32_t testval;
switch(type) {
default:
printf("not ok %d - memory invalid type: %d at 0x%" PRIx64 "\n", log_num++, type, addr);
return false;
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_read(uc, addr, &testval, sizeof(testval)) != UC_ERR_OK) {
printf("not ok %d - uc_mem_read fail for address: 0x%" PRIx64 "\n", log_num++, addr);
} else {
printf("ok %d - uc_mem_read success after mem_protect at test %d\n", log_num++, test_num - 1);
}
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 addr, testval;
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, CODE_SECTION, CODE_SIZE, UC_PROT_READ | UC_PROT_EXEC);
uc_mem_map(uc, 0x200000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
uc_mem_map(uc, 0x300000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
uc_mem_map(uc, 0x3ff000, 0x3000, UC_PROT_READ | UC_PROT_WRITE);
// fill in sections that shouldn't get touched
if (uc_mem_write(uc, 0x3ff000, buf1, sizeof(buf1))) {
printf("not ok %d - Failed to write random buffer 1 to memory, quit!\n", log_num++);
return 2;
} else {
printf("ok %d - Random buffer 1 written to memory\n", log_num++);
}
if (uc_mem_write(uc, 0x401000, buf2, sizeof(buf2))) {
printf("not ok %d - Failed to write random buffer 2 to memory, quit!\n", log_num++);
return 3;
} 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, CODE_SECTION, PROGRAM, sizeof(PROGRAM))) {
printf("not ok %d - Failed to write emulation code to memory, quit!\n", log_num++);
return 4;
} 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 5;
} 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 6;
} 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, hook_mem_invalid, NULL, 1, 0) != UC_ERR_OK) {
printf("not ok %d - Failed to install memory invalid handler\n", log_num++);
return 7;
} 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, CODE_SECTION, CODE_SECTION + CODE_SIZE, 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 8;
} else {
printf("ok %d - uc_emu_start complete\n", log_num++);
}
printf("# END execution\n");
//read from the remapped memory
testval = 0x42424242;
for (addr = 0x200000; addr <= 0x400000; addr += 0x100000) {
uint32_t val;
if (uc_mem_read(uc, addr, &val, sizeof(val)) != UC_ERR_OK) {
printf("not ok %d - Failed uc_mem_read for address 0x%x\n", log_num++, addr);
} else {
printf("ok %d - Good uc_mem_read from 0x%x\n", log_num++, addr);
}
if (val != testval) {
printf("not ok %d - Read 0x%x, expected 0x%x\n", log_num++, val, testval);
} else {
printf("ok %d - Correct value retrieved\n", log_num++);
}
testval += 0x02020202;
}
//account for the two mods made by the machine code
buf1[512] = 0x47474747;
buf2[512] = 0x48484848;
//make sure that random blocks didn't get nuked
// fill in sections that shouldn't get touched
if (uc_mem_read(uc, 0x3ff000, 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, 0x401000, 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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