C 语言执行机器码指令

#include <stdio.h> #include <string.h> #include <sys/mman.h> int main() { typedef int (*func_t)(); unsigned char code[] = { 0xb8, 0x08, 0x00, 0x00, 0x00, // mov eax, 0x08 0xc3 // ret }; // 申请一片可读可写可执行的匿名私有内存区域 unsigned char *pcode = (unsigned char *)mmap( NULL, 4096, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); memcpy(pcode, code, sizeof(code)); func_t foo = pcode; printf("%d\n", foo()); munmap(pcode, 4096); return 0; }