126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/**
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* Unicorn memory API tests
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*
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* This tests memory read/write and map/unmap functionality.
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* One is necessary for doing the other.
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*/
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#include "unicorn_test.h"
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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/* Called before every test to set up a new instance */
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static int setup(void **state)
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{
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uc_engine *uc;
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uc_assert_success(uc_open(UC_ARCH_X86, UC_MODE_64, &uc));
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*state = uc;
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return 0;
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}
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/* Called after every test to clean up */
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static int teardown(void **state)
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{
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uc_engine *uc = *state;
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uc_assert_success(uc_close(uc));
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*state = NULL;
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return 0;
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}
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/******************************************************************************/
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// mapping the last pages will silently fail
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static void test_last_page_map(void **state)
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{
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uc_engine *uc = *state;
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uint8_t writebuf[0x10];
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memset(writebuf, 0xCC, sizeof(writebuf));
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const uint64_t mem_len = 0x1000;
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const uint64_t last_page = 0xfffffffffffff000;
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uc_assert_success(uc_mem_map(uc, last_page, mem_len, UC_PROT_NONE));
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uc_assert_success(uc_mem_write(uc, last_page, writebuf, sizeof(writebuf)));
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}
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// segfaults with NULL-deref (caused by UC_PROT_NONE)
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static void test_nullptr_deref_wrong_perms(void **state){
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uc_engine *uc = *state;
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const uint64_t base_addr = 0x400000;
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uc_assert_success(uc_mem_map(uc, base_addr, 4096, UC_PROT_NONE));
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uc_emu_start(uc, base_addr, base_addr + 1, 0, 0);
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}
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static int number_of_memory_reads = 0;
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static void hook_mem64(uc_engine *uc, uc_mem_type type, uint64_t address, int size, int64_t value, void *user_data)
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{
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number_of_memory_reads += 1;
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printf(">>> Memory is being accessed at 0x%"PRIx64 ", data size = %u\n", address, size);
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}
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//if a read is performed from a big address whith a non-zero last digit, multiple read events are triggered
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static void test_high_address_reads(void **state)
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{
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uc_engine *uc = *state;
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uc_hook trace2;
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uint64_t addr = 0x0010000000000001;
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//addr = 0x0010000000000000; // uncomment to fix wrong? behaviour
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//addr = 90000000; // uncomment to fix wrong? behaviour
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//
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uc_mem_map(uc, addr-(addr%4096), 4096*2, UC_PROT_ALL);
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uc_assert_success(uc_reg_write(uc, UC_X86_REG_RAX, &addr));
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const uint64_t base_addr = 0x40000;
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uint8_t code[] = {0x48,0x8b,0x00,0x90,0x90,0x90,0x90}; // mov rax, [rax], nops
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uc_assert_success(uc_mem_map(uc, base_addr, 4096, UC_PROT_ALL));
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uc_assert_success(uc_mem_write(uc, base_addr, code, 7));
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uc_assert_success(uc_hook_add(uc, &trace2, UC_HOOK_MEM_READ, hook_mem64, NULL, 1, 0));
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uc_assert_success(uc_emu_start(uc, base_addr, base_addr + 3, 0, 0));
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if(number_of_memory_reads != 1) {
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fail_msg("wrong number of memory reads for instruction %i", number_of_memory_reads);
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}
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}
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//if a read is performed from a big address whith a non-zero last digit, 0 will be read
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static void test_high_address_read_values(void **state)
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{
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uc_engine *uc = *state;
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uint64_t addr = 0x0010000000000001;
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//addr = 0x000ffffffffffff8; // uncomment to fix wrong behaviour
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//addr = 90000000; // uncomment to fix wrong behaviour
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//
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uint8_t content[] = {0x42,0x42,0x42,0x42, 0x42,0x42,0x42,0x42};
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uc_assert_success(uc_mem_map(uc, addr-(addr%4096), 4096*2, UC_PROT_ALL));
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uc_assert_success(uc_mem_write(uc, addr, content, 8));
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uc_assert_success(uc_reg_write(uc, UC_X86_REG_RAX, &addr));
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const uint64_t base_addr = 0x40000;
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uint8_t code[] = {0x48,0x8b,0x00,0x90,0x90,0x90,0x90}; // mov rax, [rax], nops
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uc_assert_success(uc_mem_map(uc, base_addr, 4096, UC_PROT_ALL));
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uc_assert_success(uc_mem_write(uc, base_addr, code, 7));
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uc_assert_success(uc_emu_start(uc, base_addr, base_addr + 3, 0, 0));
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uint64_t rax = 0;
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uc_assert_success(uc_reg_read(uc, UC_X86_REG_RAX, &rax));
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if(rax != 0x4242424242424242) {
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fail_msg("wrong memory read from code %"PRIx64, rax);
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}
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}
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int main(void) {
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#define test(x) cmocka_unit_test_setup_teardown(x, setup, teardown)
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const struct CMUnitTest tests[] = {
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test(test_last_page_map),
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test(test_high_address_reads),
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test(test_high_address_read_values),
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test(test_nullptr_deref_wrong_perms),
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};
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#undef test
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return cmocka_run_group_tests(tests, NULL, NULL);
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}
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