下载地址：https://www.pan38.com/share.php?code=JCnzE 提取密码：7789
如何在x86架构上通过修改内存保护和写入跳转指令来实现函数劫持。实际应用中需要考虑更多因素如多线程安全、不同架构兼容性等，包含较长的代码示例。不过需要说明的是，直接修改机器码通常涉及底层系统操作，可能涉及安全风险。以下是一个技术演示示例。
include
include
include
include
include
// 原始函数示例
int original_function(int a, int b) {
return a + b;
}
// 伪装后的函数
int hooked_function(int a, int b) {
printf("Function hooked! Original args: %d, %d\n", a, b);
return a * b; // 修改行为
}
void manipulate_machine_code() {
// 获取函数地址
void* original_addr = (void)original_function;
void hook_addr = (void*)hooked_function;
// 计算页大小
long page_size = sysconf(_SC_PAGESIZE);
void* page_start = (void*)((long)original_addr & ~(page_size - 1));
// 修改内存保护
if(mprotect(page_start, page_size, PROT_READ | PROT_WRITE | PROT_EXEC) == -1) {
perror("mprotect");
return;
}
// 机器码跳转指令 (x86)
unsigned char jmp_code[5];
jmp_code[0] = 0xE9; // JMP指令
*(int*)(jmp_code+1) = (int)(hook_addr - original_addr - 5);
// 备份原始字节
unsigned char original_bytes[5];
memcpy(original_bytes, original_addr, 5);
// 写入跳转指令
memcpy(original_addr, jmp_code, 5);
printf("Machine code modified successfully!\n");
// 测试调用
int result = original_function(5, 3);
printf("Hooked result: %d\n", result);
// 恢复原始代码 (可选)
memcpy(original_addr, original_bytes, 5);
}
int main() {
printf("Original function result: %d\n", original_function(5, 3));
manipulate_machine_code();
return 0;
}
ifndef MACHINE_CODE_HOOK_H
define MACHINE_CODE_HOOK_H
include
include
typedef struct {
void* original_addr;
void* hook_addr;
uint8_t original_bytes[32];
size_t patch_size;
} HookContext;
bool initialize_hook(HookContext* ctx, void* original, void* hook);
bool enable_hook(HookContext* ctx);
bool disable_hook(HookContext* ctx);
void cleanup_hook(HookContext* ctx);
endif
include "machine_code_hook.h"
include
include
include
include
static bool make_memory_writable(void* addr, size_t len) {
long page_size = sysconf(_SC_PAGESIZE);
void* page_start = (void*)((uintptr_t)addr & ~(page_size - 1));
return mprotect(page_start, page_size, PROT_READ|PROT_WRITE|PROT_EXEC) == 0;
}
bool initialize_hook(HookContext* ctx, void* original, void* hook) {
if (!ctx || !original || !hook) return false;
ctx->original_addr = original;
ctx->hook_addr = hook;
ctx->patch_size = 0;
// 根据架构确定跳转指令
if defined(x86_64) || defined(_M_X64)
// x64架构跳转指令
uint8_t jmp_code[] = {0xFF, 0x25, 0x00, 0x00, 0x00, 0x00};
*(void**)(jmp_code + 6) = hook;
ctx->patch_size = sizeof(jmp_code);
elif defined(i386) || defined(_M_IX86)
// x86架构跳转指令
uint8_t jmp_code[] = {0xE9};
*(int32_t*)(jmp_code + 1) = (int32_t)((uintptr_t)hook - (uintptr_t)original - 5);
ctx->patch_size = 5;
elif defined(arm)
// ARM架构跳转指令
uint32_t hook_addr = (uint32_t)hook;
uint8_t jmp_code[] = {
0x04, 0xF0, 0x1F, 0xE5, // LDR PC, [PC, #-4]
hook_addr & 0xFF,
(hook_addr >> 8) & 0xFF,
(hook_addr >> 16) & 0xFF,
(hook_addr >> 24) & 0xFF
};
ctx->patch_size = sizeof(jmp_code);
else
#error "Unsupported architecture"
endif
// 备份原始字节
memcpy(ctx->original_bytes, original, ctx->patch_size);
return true;
}
bool enable_hook(HookContext* ctx) {
if (!ctx || !ctx->original_addr || !ctx->hook_addr || ctx->patch_size == 0)
return false;
if (!make_memory_writable(ctx->original_addr, ctx->patch_size))
return false;
// 根据架构写入跳转指令
if defined(x86_64) || defined(_M_X64)
uint8_t jmp_code[] = {0xFF, 0x25, 0x00, 0x00, 0x00, 0x00};
*(void**)(jmp_code + 6) = ctx->hook_addr;
memcpy(ctx->original_addr, jmp_code, sizeof(jmp_code));
elif defined(i386) || defined(_M_IX86)
uint8_t jmp_code[] = {0xE9};
*(int32_t*)(jmp_code + 1) = (int32_t)((uintptr_t)ctx->hook_addr - (uintptr_t)ctx->original_addr - 5);
memcpy(ctx->original_addr, jmp_code, 5);
elif defined(arm)
uint32_t hook_addr = (uint32_t)ctx->hook_addr;
uint8_t jmp_code[] = {
0x04, 0xF0, 0x1F, 0xE5,
hook_addr & 0xFF,
(hook_addr >> 8) & 0xFF,
(hook_addr >> 16) & 0xFF,
(hook_addr >> 24) & 0xFF
};
memcpy(ctx->original_addr, jmp_code, sizeof(jmp_code));
endif
return true;
}
bool disable_hook(HookContext* ctx) {
if (!ctx || !ctx->original_addr || ctx->patch_size == 0)
return false;
if (!make_memory_writable(ctx->original_addr, ctx->patch_size))
return false;
memcpy(ctx->original_addr, ctx->original_bytes, ctx->patch_size);
return true;
}
void cleanup_hook(HookContext* ctx) {
if (ctx) {
memset(ctx, 0, sizeof(HookContext));
}
}
include "machine_code_hook.h"
include
// 原始函数
int target_function(int a, int b) {
printf("Original function called with %d and %d\n", a, b);
return a + b;
}
// 钩子函数
int hook_function(int a, int b) {
printf("Hook function called with %d and %d\n", a, b);
return a * b; // 修改行为
}
int main() {
HookContext ctx;
// 初始化钩子
if (!initialize_hook(&ctx, target_function, hook_function)) {
printf("Hook initialization failed\n");
return 1;
}
// 启用钩子
printf("Enabling hook...\n");
if (!enable_hook(&ctx)) {
printf("Failed to enable hook\n");
return 1;
}
// 测试调用
int result = target_function(5, 3);
printf("Result after hook: %d\n", result);
// 禁用钩子
printf("Disabling hook...\n");
if (!disable_hook(&ctx)) {
printf("Failed to disable hook\n");
return 1;
}
// 再次测试调用
result = target_function(5, 3);
printf("Result after unhook: %d\n", result);
cleanup_hook(&ctx);
return 0;
}