pwnable小结

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 char buf[32];
 5 int main(int argc, char* argv[], char* envp[]){
 6     if(argc<2){
 7         printf("pass argv[1] a number\n");
 8         return 0;
 9     }
10     int fd = atoi( argv[1] ) - 0x1234;
11     int len = 0;
12     len = read(fd, buf, 32);
13     if(!strcmp("LETMEWIN\n", buf)){
14         printf("good job :)\n");
15         system("/bin/cat flag");
16         exit(0);
17     }
18     printf("learn about Linux file IO\n");
19     return 0;
20 
21 }