raw.c

raw.c

#include <sys/mman.h>


typedef unsigned int uintf();


int main(int argc, char* argv[]) {
    unsigned char* f = mmap(
        0, 4096, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
    if (MAP_FAILED == f) {
        return 1;
    }
    f[0] = 0x55;
    f[1] = 0x48;
    f[2] = 0x89;
    f[3] = 0xe5;
    f[4] = 0xb8;
    f[5] = 0xf3;
    f[6] = 0x00;
    f[7] = 0x00;
    f[8] = 0x00;
    f[9] = 0x5d;
    f[10] = 0xc3;
    int protect_result = mprotect(f, 4096, PROT_READ | PROT_EXEC);
    if (-1 == protect_result) {
        return 2;
    }
    uintf* justreturn = (uintf*) f;
    unsigned int result = justreturn();
    if (243 == result) {
        return 0;
    } else {
        return 3;
    }
}