281 lines
9.3 KiB
C
281 lines
9.3 KiB
C
/*
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Executable memory regions 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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"\xeb\x45\x5e\x81\xe6\x00\xf0\xff\xff\x40\x40\x40\x40\x40\x40\x40"
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"\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40\x40"
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"\x40\x40\x40\x40\x40\x40\x40\x89\xf7\x81\xc7\x00\x00\x10\x00\xb9"
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"\x4c\x00\x00\x00\x81\xff\x00\x00\x40\x00\x75\x01\xf4\xf3\xa4\x81"
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"\xe7\x00\xf0\xff\xff\xff\xe7\xe8\xb6\xff\xff\xff";
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// total size: 76 bytes
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/*
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bits 32
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; assumes r-x section at 0x100000
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; assumes rw- section at 0x200000
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; assumes r-- section at 0x300000
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; also needs an initialized stack
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start:
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jmp bottom
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top:
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pop esi
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and esi, ~0xfff
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times 30 inc eax
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mov edi, esi
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add edi, 0x100000
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mov ecx, end - start
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rep movsb
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and edi, ~0xfff
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cmp edi, 0x400000
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jnz next_block
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hlt
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next_block:
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jmp edi
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bottom:
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call top
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end:
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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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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 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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switch(type) {
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default:
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printf("not ok %d - UC_HOOK_MEM_INVALID type: %d at 0x%" PRIx64 "\n", log_num++, type, addr);
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return false;
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case UC_MEM_EXEC_PROT:
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printf("# Fetch from non-executable memory at 0x%"PRIx64 "\n", addr);
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//make page executable
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if (uc_mem_protect(uc, addr & ~0xfffL, 0x1000, UC_PROT_READ | UC_PROT_EXEC) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_protect fail for address: 0x%" PRIx64 "\n", log_num++, addr);
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} else {
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printf("ok %d - uc_mem_protect success at 0x%" PRIx64 "\n", log_num++, addr);
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}
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return true;
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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_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 esp, eip;
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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, 0x100000, 0x1000, UC_PROT_READ | UC_PROT_EXEC);
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uc_mem_map(uc, 0x1ff000, 0x2000, UC_PROT_READ | UC_PROT_WRITE);
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uc_mem_map(uc, 0x300000, 0x2000, UC_PROT_READ);
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uc_mem_map(uc, 0xf00000, 0x1000, UC_PROT_READ | UC_PROT_WRITE);
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esp = 0xf00000 + 0x1000;
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// Setup stack pointer
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if (uc_reg_write(uc, UC_X86_REG_ESP, &esp)) {
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printf("not ok %d - Failed to set esp. quit!\n", log_num++);
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return 2;
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} else {
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printf("ok %d - ESP set\n", log_num++);
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}
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// fill in sections that shouldn't get touched
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if (uc_mem_write(uc, 0x1ff000, 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 3;
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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, 0x301000, 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 4;
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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, 0x100000, 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 5;
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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, (uint64_t)1, (uint64_t)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 6;
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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, (uint64_t)1, (uint64_t)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 7;
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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_INVALID, hook_mem_invalid, NULL) != UC_ERR_OK) {
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printf("not ok %d - Failed to install UC_HOOK_MEM_INVALID ucr\n", log_num++);
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return 8;
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} else {
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printf("ok %d - UC_HOOK_MEM_INVALID 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, 0x100000, 0x400000, 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 9;
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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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// get ending EIP
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if (uc_reg_read(uc, UC_X86_REG_EIP, &eip)) {
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printf("not ok %d - Failed to read eip.\n", log_num++);
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} else {
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printf("ok %d - Ending EIP 0x%x\n", log_num++, eip);
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}
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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, 0x1ff000, 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, 0x301000, 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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