303 lines
11 KiB
C
303 lines
11 KiB
C
/*
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uc_mem_protect demo / unit test
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Copyright(c) 2015 Chris Eagle
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unicorn/unicorn.h>
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unsigned char PROGRAM[] =
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"\xc7\x05\x00\x00\x20\x00\x41\x41\x41\x41\x90\xc7\x05\x00\x00\x20"
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"\x00\x42\x42\x42\x42\xc7\x05\x00\x00\x30\x00\x43\x43\x43\x43\x90"
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"\xc7\x05\x00\x00\x30\x00\x44\x44\x44\x44\xc7\x05\x00\x00\x40\x00"
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"\x45\x45\x45\x45\x90\xc7\x05\x00\x00\x40\x00\x46\x46\x46\x46\xc7"
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"\x05\x00\xf8\x3f\x00\x47\x47\x47\x47\xc7\x05\x00\x18\x40\x00\x48"
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"\x48\x48\x48\xf4";
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// total size: 84 bytes
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/*
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bits 32
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; assumes code section at 0x100000
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; assumes data section at 0x200000, initially rw
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; assumes data section at 0x300000, initially rw
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; assumes data section at 0x400000, initially rw
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; with installed hooks unmaps or maps on each nop
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mov dword [0x200000], 0x41414141
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nop ; mark it RO
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mov dword [0x200000], 0x42424242
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mov dword [0x300000], 0x43434343
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nop ; mark it RO
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mov dword [0x300000], 0x44444444
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mov dword [0x400000], 0x45454545
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nop ; mark it RO
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mov dword [0x400000], 0x46464646
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mov dword [0x3ff800], 0x47474747 ; make sure surrounding areas remained RW
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mov dword [0x401800], 0x48484848 ; make sure surrounding areas remained RW
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hlt ; tell hook function we are done
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*/
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int test_num = 0;
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uint32_t tests[] = {
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0x41414141,
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0x43434343,
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0x45454545
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};
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static int log_num = 1;
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#define CODE_SECTION 0x100000
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#define CODE_SIZE 0x1000
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// callback for tracing instruction
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static void hook_code(uc_engine *uc, uint64_t addr, uint32_t size, void *user_data)
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{
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uint8_t opcode;
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uint32_t testval;
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if (uc_mem_read(uc, addr, &opcode, 1) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
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}
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printf("ok %d - uc_mem_read for opcode at address 0x%" PRIx64 "\n", log_num++, addr);
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switch (opcode) {
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case 0x90: //nop
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printf("# Handling NOP\n");
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if (uc_mem_read(uc, 0x200000 + test_num * 0x100000, &testval, sizeof(testval)) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail for address: 0x%x\n", log_num++, 0x200000 + test_num * 0x100000);
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} else {
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printf("ok %d - good uc_mem_read for address: 0x%x\n", log_num++, 0x200000 + test_num * 0x100000);
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printf("# uc_mem_read for test %d\n", test_num);
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if (testval == tests[test_num]) {
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printf("ok %d - passed test %d\n", log_num++, test_num);
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} else {
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printf("not ok %d - failed test %d\n", log_num++, test_num);
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printf("# Expected: 0x%x\n",tests[test_num]);
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printf("# Received: 0x%x\n", testval);
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}
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}
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if (uc_mem_protect(uc, 0x200000 + test_num * 0x100000, 0x1000, UC_PROT_READ) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_protect fail during hook_code callback, addr: 0x%x\n", log_num++, 0x200000 + test_num * 0x100000);
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} else {
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printf("ok %d - uc_mem_protect success\n", log_num++);
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}
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test_num++;
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break;
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case 0xf4: //hlt
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printf("# Handling HLT\n");
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if (uc_emu_stop(uc) != UC_ERR_OK) {
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printf("not ok %d - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
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_exit(-1);
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} else {
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printf("ok %d - hlt encountered, uc_emu_stop called\n", log_num++);
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}
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break;
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default: //all others
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printf("# Handling OTHER\n");
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break;
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}
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}
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// callback for tracing memory access (READ or WRITE)
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static void hook_mem_write(uc_engine *uc, uc_mem_type type,
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uint64_t addr, int size, int64_t value, void *user_data)
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{
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printf("# write to memory at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
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}
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// callback for tracing invalid memory access (READ or WRITE)
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static bool hook_mem_invalid(uc_engine *uc, uc_mem_type type,
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uint64_t addr, int size, int64_t value, void *user_data)
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{
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uint32_t testval;
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switch(type) {
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default:
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printf("not ok %d - memory invalid type: %d at 0x%" PRIx64 "\n", log_num++, type, addr);
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return false;
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case UC_MEM_WRITE_PROT:
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printf("# write to non-writeable memory at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
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if (uc_mem_read(uc, addr, &testval, sizeof(testval)) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail for address: 0x%" PRIx64 "\n", log_num++, addr);
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} else {
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printf("ok %d - uc_mem_read success after mem_protect at test %d\n", log_num++, test_num - 1);
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}
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if (uc_mem_protect(uc, addr & ~0xfffL, 0x1000, UC_PROT_READ | UC_PROT_WRITE) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_protect fail during hook_mem_invalid callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
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} else {
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printf("ok %d - uc_mem_protect success\n", log_num++);
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}
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return true;
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}
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}
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int main(int argc, char **argv, char **envp)
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{
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uc_engine *uc;
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uc_hook trace1, trace2;
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uc_err err;
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uint32_t addr, testval;
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int32_t buf1[1024], buf2[1024], readbuf[1024];
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int i;
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//don't really care about quality of randomness
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srand(time(NULL));
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for (i = 0; i < 1024; i++) {
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buf1[i] = rand();
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buf2[i] = rand();
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}
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printf("# Memory protect test\n");
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// Initialize emulator in X86-32bit mode
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err = uc_open(UC_ARCH_X86, UC_MODE_32, &uc);
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if (err) {
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printf("not ok %d - Failed on uc_open() with error returned: %u\n", log_num++, err);
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return 1;
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} else {
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printf("ok %d - uc_open() success\n", log_num++);
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}
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uc_mem_map(uc, CODE_SECTION, CODE_SIZE, UC_PROT_READ | UC_PROT_EXEC);
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uc_mem_map(uc, 0x200000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
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uc_mem_map(uc, 0x300000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
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uc_mem_map(uc, 0x3ff000, 0x3000, UC_PROT_READ | UC_PROT_WRITE);
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// fill in sections that shouldn't get touched
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if (uc_mem_write(uc, 0x3ff000, buf1, sizeof(buf1))) {
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printf("not ok %d - Failed to write random buffer 1 to memory, quit!\n", log_num++);
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return 2;
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} else {
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printf("ok %d - Random buffer 1 written to memory\n", log_num++);
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}
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if (uc_mem_write(uc, 0x401000, buf2, sizeof(buf2))) {
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printf("not ok %d - Failed to write random buffer 2 to memory, quit!\n", log_num++);
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return 3;
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} else {
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printf("ok %d - Random buffer 2 written to memory\n", log_num++);
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}
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// write machine code to be emulated to memory
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if (uc_mem_write(uc, CODE_SECTION, PROGRAM, sizeof(PROGRAM))) {
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printf("not ok %d - Failed to write emulation code to memory, quit!\n", log_num++);
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return 4;
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} else {
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printf("ok %d - Program written to memory\n", log_num++);
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}
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if (uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, 1, 0) != UC_ERR_OK) {
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printf("not ok %d - Failed to install UC_HOOK_CODE ucr\n", log_num++);
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return 5;
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} else {
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printf("ok %d - UC_HOOK_CODE installed\n", log_num++);
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}
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// intercept memory write events
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if (uc_hook_add(uc, &trace1, UC_HOOK_MEM_WRITE, hook_mem_write, NULL, 1, 0) != UC_ERR_OK) {
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printf("not ok %d - Failed to install UC_HOOK_MEM_WRITE ucr\n", log_num++);
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return 6;
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} else {
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printf("ok %d - UC_HOOK_MEM_WRITE installed\n", log_num++);
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}
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// intercept invalid memory events
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if (uc_hook_add(uc, &trace1, UC_HOOK_MEM_WRITE_PROT, hook_mem_invalid, NULL, 1, 0) != UC_ERR_OK) {
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printf("not ok %d - Failed to install memory invalid handler\n", log_num++);
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return 7;
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} else {
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printf("ok %d - memory invalid handler installed\n", log_num++);
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}
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// emulate machine code until told to stop by hook_code
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printf("# BEGIN execution\n");
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err = uc_emu_start(uc, CODE_SECTION, CODE_SECTION + CODE_SIZE, 0, 0);
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if (err != UC_ERR_OK) {
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printf("not ok %d - Failure on uc_emu_start() with error %u:%s\n", log_num++, err, uc_strerror(err));
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return 8;
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} else {
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printf("ok %d - uc_emu_start complete\n", log_num++);
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}
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printf("# END execution\n");
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//read from the remapped memory
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testval = 0x42424242;
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for (addr = 0x200000; addr <= 0x400000; addr += 0x100000) {
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uint32_t val;
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if (uc_mem_read(uc, addr, &val, sizeof(val)) != UC_ERR_OK) {
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printf("not ok %d - Failed uc_mem_read for address 0x%x\n", log_num++, addr);
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} else {
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printf("ok %d - Good uc_mem_read from 0x%x\n", log_num++, addr);
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}
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if (val != testval) {
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printf("not ok %d - Read 0x%x, expected 0x%x\n", log_num++, val, testval);
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} else {
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printf("ok %d - Correct value retrieved\n", log_num++);
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}
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testval += 0x02020202;
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}
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//account for the two mods made by the machine code
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buf1[512] = 0x47474747;
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buf2[512] = 0x48484848;
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//make sure that random blocks didn't get nuked
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// fill in sections that shouldn't get touched
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if (uc_mem_read(uc, 0x3ff000, readbuf, sizeof(readbuf))) {
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printf("not ok %d - Failed to read random buffer 1 from memory\n", log_num++);
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} else {
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printf("ok %d - Random buffer 1 read from memory\n", log_num++);
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if (memcmp(buf1, readbuf, 4096)) {
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printf("not ok %d - Random buffer 1 contents are incorrect\n", log_num++);
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} else {
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printf("ok %d - Random buffer 1 contents are correct\n", log_num++);
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}
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}
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if (uc_mem_read(uc, 0x401000, readbuf, sizeof(readbuf))) {
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printf("not ok %d - Failed to read random buffer 2 from memory\n", log_num++);
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} else {
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printf("ok %d - Random buffer 2 read from memory\n", log_num++);
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if (memcmp(buf2, readbuf, 4096)) {
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printf("not ok %d - Random buffer 2 contents are incorrect\n", log_num++);
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} else {
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printf("ok %d - Random buffer 2 contents are correct\n", log_num++);
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}
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}
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if (uc_close(uc) == UC_ERR_OK) {
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printf("ok %d - uc_close complete\n", log_num++);
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} else {
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printf("not ok %d - uc_close complete\n", log_num++);
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}
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return 0;
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}
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