buffer overflow example

bo.c

#include <stdio.h> 
#include <string.h> 

int main(void) {
    char buff[15];
    int passed = 0;
    printf("Pleaes enter your password \n" ) ; 
    gets(buff) ; 
    
    //  equal strings return 0 
    if(strcmp(buff, "kkk")){ 
        printf( "wrong password \n");
    }
    else{ 
        printf("corrct password \n") ; 
        pass = 1;  
    }

    if (passed){
        printf( "you're now the root \n");
    }
    return 0 ; 
}