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| #include<stdio.h>
#include <math.h>
#include <stdio.h>
#include<unistd.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/prctl.h>
#include <linux/filter.h>
#include <linux/seccomp.h>
void sandbox(){
struct sock_filter filter[] = {
BPF_STMT(BPF_LD+BPF_W+BPF_ABS,4),
BPF_JUMP(BPF_JMP+BPF_JEQ,0xc000003e,0,2),
BPF_STMT(BPF_LD+BPF_W+BPF_ABS,0),
BPF_JUMP(BPF_JMP+BPF_JEQ,59,0,1),
BPF_STMT(BPF_RET+BPF_K,SECCOMP_RET_KILL),
BPF_STMT(BPF_RET+BPF_K,SECCOMP_RET_ALLOW),
};
struct sock_fprog prog = {
.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
.filter = filter,
};
prctl(PR_SET_NO_NEW_PRIVS,1,0,0,0);
prctl(PR_SET_SECCOMP,SECCOMP_MODE_FILTER,&prog);
}
int init(){
setvbuf(stdin, 0LL, 2, 0LL);
setvbuf(stdout, 0LL, 2, 0LL);
return setvbuf(stderr, 0LL, 2, 0LL);
}
int num = 0;
char *heaparray[0x10];
size_t realsize[0x10];
void create(){
if(num >= 0x20){
puts("no more");
return;
}
int size;
puts("Size of Heap : ");
scanf("%d",&size);
heaparray[num]=(char *)malloc(size);
realsize[num]=size;
num++;
}
void show(){
int idx ;
char buf[4];
printf("Index :\n");
read(0, buf, 4);
idx = atoi(buf);
if(idx < 0 || idx >= 0x10){
puts("Out of bound!");
_exit(0);
}
if(heaparray[idx]){
printf("Size : %ld\nContent : %s\n",realsize[idx],heaparray[idx]);
puts("Done !");
}else{
puts("No such heap !");
}
}
void edit(){
int idx ;
char buf[4];
printf("Index :\n");
read(0, buf, 4);
idx = atoi(buf);
if(idx < 0 || idx >= 0x10){
puts("Out of bound!");
_exit(0);
}
if(heaparray[idx]){
int size;
puts("Size of Heap : ");
scanf("%d",&size);
printf("Content of heap : \n");
read(0,heaparray[idx],size);
puts("Done !");
}else{
puts("No such heap !");
}
}
void dele(){
int idx ;
char buf[4];
printf("Index :\n");
read(0,buf,4);
idx = atoi(buf);
if(idx < 0 || idx >= 0x10){
puts("Out of bound!");
_exit(0);
}
if(heaparray[idx]){
free(heaparray[idx]);
realsize[idx] = 0 ;
heaparray[idx] = NULL;
puts("Done !");
num--;
}else{
puts("No such heap !");
}
}
void menu(void){
puts("1.create");
puts("2.dele");
puts("3.edit");
puts("4.show");
}
void main(){
init();
sandbox();
int choice;
while(1){
menu();
scanf("%d",&choice);
switch(choice)
{
case 1:create();break;
case 2:dele();break;
case 3:edit();break;
case 4:show();break;
default:puts("error");
}
}
}
|
