mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-12-23 00:25:27 +00:00
Roll back uc_mem_protect changes
This commit is contained in:
parent
71ddad9474
commit
adc254cc74
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@ -427,25 +427,6 @@ uc_err uc_mem_map(uch handle, uint64_t address, size_t size);
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UNICORN_EXPORT
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uc_err uc_mem_map_ex(uch handle, uint64_t address, size_t size, uint32_t perms);
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/*
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Set memory permissions for emulation memory.
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This API changes permissions on an existing memory region.
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@handle: handle returned by uc_open()
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@start: starting address of the memory region to be modified.
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This address must be aligned to 4KB, or this will return with UC_ERR_MAP error.
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@block_size: size of the memory region to be modified.
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This size must be multiple of 4KB, or this will return with UC_ERR_MAP error.
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@perms: New permissions for the mapped region.
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This must be some combination of UC_PROT_READ | UC_PROT_WRITE,
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or this will return with UC_ERR_MAP error.
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@return UC_ERR_OK on success, or other value on failure (refer to uc_err enum
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for detailed error).
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*/
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UNICORN_EXPORT
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uc_err uc_mem_protect(uch handle, uint64_t start, size_t block_size, uint32_t perms);
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#ifdef __cplusplus
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}
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#endif
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@ -97,7 +97,6 @@ endif
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ifneq (,$(findstring x86,$(UNICORN_ARCHS)))
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SOURCES += sample_x86.c
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SOURCES += shellcode.c
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SOURCES += mem_protect.c
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endif
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ifneq (,$(findstring m68k,$(UNICORN_ARCHS)))
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SOURCES += sample_m68k.c
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@ -112,7 +111,7 @@ all: $(BINARY)
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clean:
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rm -rf *.o $(OBJS_ELF) $(BINARY) $(SAMPLEDIR)/*.exe $(SAMPLEDIR)/*.static $(OBJDIR)/lib$(LIBNAME)* $(OBJDIR)/$(LIBNAME)*
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rm -rf libunicorn*.so libunicorn*.lib libunicorn*.dylib unicorn*.dll unicorn*.lib
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rm -rf sample_x86 sample_arm sample_arm64 sample_mips sample_sparc sample_ppc sample_m68k shellcode mem_protect
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rm -rf sample_x86 sample_arm sample_arm64 sample_mips sample_sparc sample_ppc sample_m68k shellcode
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$(BINARY): $(OBJS)
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@ -1,238 +0,0 @@
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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 <unicorn/unicorn.h>
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unsigned char PROGRAM[] =
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"\xc7\x05\x00\x00\x40\x00\x41\x41\x41\x41\x90\xc7\x05\x00\x00\x40"
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"\x00\x42\x42\x42\x42\x90\xc7\x05\x01\x00\x40\x00\x43\x43\x43\x43"
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"\x90\xc7\x05\x01\x00\x40\x00\x44\x44\x44\x44\x90\x66\xc7\x05\x02"
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"\x00\x40\x00\x45\x45\x90\x66\xc7\x05\x02\x00\x40\x00\x46\x46\x90"
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"\x66\xc7\x05\x01\x00\x40\x00\x47\x47\x90\x66\xc7\x05\x01\x00\x40"
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"\x00\x48\x48\x90\xc6\x05\x03\x00\x40\x00\x49\x90\xc6\x05\x03\x00"
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"\x40\x00\x4a\x90\xf4";
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// total size: 101 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 0x400000, initially rw?
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; with installed hooks toggles UC_PROT_WRITE on each nop
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mov dword [0x400000], 0x41414141 ; aligned
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nop
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mov dword [0x400000], 0x42424242 ; aligned
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nop
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mov dword [0x400001], 0x43434343 ; unaligned
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nop
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mov dword [0x400001], 0x44444444 ; unaligned
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nop
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mov word [0x400002], 0x4545 ; aligned
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nop
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mov word [0x400002], 0x4646 ; aligned
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nop
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mov word [0x400001], 0x4747 ; unaligned
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nop
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mov word [0x400001], 0x4848 ; unaligned
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nop
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mov byte [0x400003], 0x49 ; unaligned
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nop
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mov byte [0x400003], 0x4A ; unaligned
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nop
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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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const uint8_t *tests[] = {
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(uint8_t*)"\x41\x41\x41\x41\x00",
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(uint8_t*)"\x42\x42\x42\x42\x00",
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(uint8_t*)"\x42\x43\x43\x43\x43",
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(uint8_t*)"\x42\x44\x44\x44\x44",
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(uint8_t*)"\x42\x44\x45\x45\x44",
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(uint8_t*)"\x42\x44\x46\x46\x44",
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(uint8_t*)"\x42\x47\x47\x46\x44",
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(uint8_t*)"\x42\x48\x48\x46\x44",
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(uint8_t*)"\x42\x48\x48\x49\x44",
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(uint8_t*)"\x42\x48\x48\x4A\x44",
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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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#define DATA_SECTION 0x400000
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#define DATA_SIZE 0x1000
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static uint32_t current_perms = UC_PROT_READ | UC_PROT_WRITE;
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static void hexdump(const char *prefix, const uint8_t *bytes, uint32_t len)
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{
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uint32_t i;
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printf("%s", prefix);
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for (i = 0; i < len; i++) {
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printf("%02hhx", bytes[i]);
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}
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printf("\n");
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}
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// callback for tracing instruction
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static void hook_code(uch handle, uint64_t addr, uint32_t size, void *user_data)
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{
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uint8_t opcode;
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uint8_t bytes[5];
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if (uc_mem_read(handle, addr, &opcode, 1) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail during hook_code callback, addr: 0x%" PRIu64 "\n", log_num++, addr);
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_exit(1);
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}
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printf("ok %d - uc_mem_read for opcode\n", log_num++);
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switch (opcode) {
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case 0x90: //nop
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if (uc_mem_read(handle, DATA_SECTION, bytes, sizeof(bytes)) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail for address: 0x%" PRIu64 "\n", log_num++, addr);
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_exit(1);
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}
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printf("ok %d - uc_mem_read for test %d\n", log_num++, test_num);
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if (memcmp(bytes, tests[test_num], sizeof(bytes)) == 0) {
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printf("ok %d - passed test %d\n", log_num++, test_num);
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}
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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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hexdump("# Expected: ", tests[test_num], sizeof(bytes));
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hexdump("# Received: ", bytes, sizeof(bytes));
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}
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test_num++;
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current_perms ^= UC_PROT_WRITE;
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if (uc_mem_protect(handle, DATA_SECTION, DATA_SIZE, current_perms) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_protect fail during hook_code callback, addr: 0x%" PRIu64 "\n", log_num++, addr);
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_exit(1);
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}
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else {
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printf("ok %d - uc_mem_protect UC_PROT_WRITE toggled\n", log_num++);
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}
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break;
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case 0xf4: //hlt
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if (uc_emu_stop(handle) != UC_ERR_OK) {
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printf("not ok %d - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIu64 "\n", log_num++, addr);
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_exit(1);
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}
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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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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 bool hook_mem_invalid(uch handle, 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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uint8_t bytes[5];
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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%" PRIu64 "\n", log_num++, type, addr);
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return false;
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case UC_MEM_WRITE_RO:
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printf("# RO memory is being WRITTEN at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
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if (uc_mem_read(handle, DATA_SECTION, bytes, sizeof(bytes)) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail for address: 0x%" PRIu64 "\n", log_num++, addr);
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_exit(1);
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}
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printf("ok %d - uc_mem_read for ro side of test %d\n", log_num++, test_num - 1);
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if (memcmp(bytes, tests[test_num - 1], sizeof(bytes)) == 0) {
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printf("ok %d - passed ro side of test %d\n", log_num++, test_num - 1);
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}
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else {
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printf("ok %d - failed ro side of test %d\n", log_num++, test_num - 1);
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hexdump("# Expected: ", tests[test_num - 1], sizeof(bytes));
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hexdump("# Received: ", bytes, sizeof(bytes));
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}
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current_perms |= UC_PROT_WRITE;
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if (uc_mem_protect(handle, DATA_SECTION, DATA_SIZE, current_perms) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_protect fail during hook_mem_invalid callback, addr: 0x%" PRIu64 "\n", log_num++, addr);
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_exit(1);
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}
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else {
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printf("ok %d - uc_mem_protect UC_PROT_WRITE toggled\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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uch handle, trace1, trace2;
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uc_err err;
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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, &handle);
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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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}
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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_ex(handle, CODE_SECTION, CODE_SIZE, UC_PROT_READ);
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uc_mem_map_ex(handle, DATA_SECTION, DATA_SIZE, current_perms);
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// write machine code to be emulated to memory
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if (uc_mem_write(handle, 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 2;
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}
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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(handle, &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 handler\n", log_num++);
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return 3;
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}
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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 invalid memory events
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if (uc_hook_add(handle, &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 handler\n", log_num++);
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return 4;
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}
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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(handle, CODE_SECTION, CODE_SECTION + CODE_SIZE, 0, 100);
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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 5;
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}
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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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if (uc_close(&handle) == UC_ERR_OK) {
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printf("ok %d - uc_close complete\n", log_num++);
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}
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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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84
uc.c
84
uc.c
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@ -604,90 +604,6 @@ uc_err uc_mem_map(uch handle, uint64_t address, size_t size)
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return uc_mem_map_ex(handle, address, size, UC_PROT_READ | UC_PROT_WRITE);
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}
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UNICORN_EXPORT
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uc_err uc_mem_protect(uch handle, uint64_t start, size_t block_size, uint32_t perms)
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{
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uint64_t address;
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uint64_t size;
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struct uc_struct* uc = (struct uc_struct *)handle;
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if (handle == 0)
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// invalid handle
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return UC_ERR_UCH;
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if (block_size == 0)
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// invalid memory mapping
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return UC_ERR_MAP;
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// address must be aligned to 4KB
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if ((start & (4*1024 - 1)) != 0)
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return UC_ERR_MAP;
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// size must be multiple of 4KB
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if ((block_size & (4*1024 - 1)) != 0)
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return UC_ERR_MAP;
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// check for only valid permissions
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if ((perms & ~(UC_PROT_READ | UC_PROT_WRITE)) != 0)
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return UC_ERR_MAP;
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//check that users entire requested block is mapped
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address = start;
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size = block_size;
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while (size > 0) {
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uint64_t region_size;
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MemoryRegion *mr = memory_mapping(uc, address);
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if (mr == NULL) {
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return UC_ERR_MAP;
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}
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region_size = int128_get64(mr->size);
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if (address > mr->addr) {
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//in case start address is not aligned with start of region
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region_size -= address - mr->addr;
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}
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if (size < region_size) {
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//entire region is covered
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break;
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}
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size -= region_size;
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address += region_size;
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}
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//Now we know entire region is mapped, so change permissions
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address = start;
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size = block_size;
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while (size > 0) {
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MemoryRegion *mr = memory_mapping(uc, address);
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uint64_t region_size = int128_get64(mr->size);
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if (address > mr->addr) {
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//in case start address is not aligned with start of region
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region_size -= address - mr->addr;
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//TODO Learn how to split regions
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//In this case some proper subset of the region is having it's permissions changed
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//need to split region and add new portions into uc->mapped_blocks list
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//In this case, there is a portion of the region with original perms: mr->addr..start
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//and a portion getting new perms: start..start+block_size
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//split the block and stay in the loop
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}
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if (size < int128_get64(mr->size)) {
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//TODO Learn how to split regions
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//In this case some proper subset of the region is having it's permissions changed
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//need to split region and add new portions into uc->mapped_blocks list
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//In this case, there is a portion of the region with new perms: start..start+block_size
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//and a portion getting new perms: mr->addr+size..mr->addr+mr->size
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//split the block and break
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break;
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}
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size -= int128_get64(mr->size);
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address += int128_get64(mr->size);
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mr->perms = perms;
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uc->readonly_mem(mr, (perms & UC_PROT_WRITE) == 0);
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}
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return UC_ERR_OK;
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}
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MemoryRegion *memory_mapping(struct uc_struct* uc, uint64_t address)
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{
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unsigned int i;
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