没有域名的网站需要备案吗,2024新冠又来了吗,智慧团建登录入口,品牌建设的可行性论证pwn学习笔记#xff08;12#xff09;–Chunk Extend and Overlapping
chunk extend 是堆漏洞的一种常见利用手法#xff0c;通过 extend 可以实现 chunk overlapping#xff08;块重叠#xff09; 的效果。这种利用方法需要以下的时机和条件#xff1a;
程序中存在…pwn学习笔记12–Chunk Extend and Overlapping
chunk extend 是堆漏洞的一种常见利用手法通过 extend 可以实现 chunk overlapping块重叠 的效果。这种利用方法需要以下的时机和条件
程序中存在基于堆的漏洞漏洞可以控制 chunk header 中的数据
1、对inuse的fastbin进行extend int main(void)
{void *ptr,*ptr1;ptrmalloc(0x10);//分配第一个0x10的chunkmalloc(0x10);//分配第二个0x10的chunk*(long long *)((long long)ptr-0x8)0x41;// 修改第一个块的size域free(ptr);ptr1malloc(0x30);// 实现 extend控制了第二个块的内容return 0;
} 首先进行两次malloc之后看看heap的状态
In file: /mnt/hgfs/sharedict/ChunkExtend/extend.c3 void *ptr,*ptr1;4 5 ptrmalloc(0x10);//分配第一个0x10的chunk6 malloc(0x10);//分配第二个0x10的chunk7 ► 8 *(long long *)((long long)ptr-0x8)0x41;// 修改第一个块的size域9 10 free(ptr);11 ptr1malloc(0x30);// 实现 extend控制了第二个块的内容12 return 0;13 }
─────────────────────────────────────────────────────────[ STACK ]─────────────────────────────────────────────────────────
00:0000│ rsp 0x7fffffffde30 —▸ 0x555555758010 ◂— 0x0
01:0008│ 0x7fffffffde38 ◂— 0x0
02:0010│ rbp 0x7fffffffde40 —▸ 0x5555555546e0 (__libc_csu_init) ◂— push r15
03:0018│ 0x7fffffffde48 —▸ 0x7ffff7a2d840 (__libc_start_main240) ◂— mov edi, eax
04:0020│ 0x7fffffffde50 ◂— 0x1
05:0028│ 0x7fffffffde58 —▸ 0x7fffffffdf28 —▸ 0x7fffffffe2ac ◂— /mnt/hgfs/sharedict/ChunkExtend/test
06:0030│ 0x7fffffffde60 ◂— 0x1f7ffcca0
07:0038│ 0x7fffffffde68 —▸ 0x55555555468a (main) ◂— push rbp
───────────────────────────────────────────────────────[ BACKTRACE ]───────────────────────────────────────────────────────► f 0 0x5555555546aa main32f 1 0x7ffff7a2d840 __libc_start_main240
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x555555758020
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758040
Size: 0x20fc1pwndbg bins
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
有地址的话就去读一下两个堆的内容
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000021 Chunk1
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021 Chunk2
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000020fc1 Top Chunk
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 下一步开始释放看一看修改chunk1的size域大小
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x41Top chunk | PREV_INUSE
Addr: 0x555555758040
Size: 0x20fc1pwndbg bins
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty 发现chunk2被修改后增大了的chunk1给那占了heap里就只有一个Chunk了看看内存
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000041 原Chunk1
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021 原Chunk2
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000020fc1 Top Chunk
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 除去chunk1的size域变化了以外似乎没有其他变化但是逻辑上来说现在的堆里只有一个chunk了之后free掉chunk1看看
pwndbg heap
Free chunk (fastbins) | PREV_INUSE
Addr: 0x555555758000
Size: 0x41
fd: 0x00Top chunk | PREV_INUSE
Addr: 0x555555758040
Size: 0x20fc1pwndbg bins
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x555555758000 ◂— 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty 之后读取下内存
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000041
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000020fc1
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 下一步是重头戏试想如果原chunk1的size域没有真正变化那么我们进行malloc一个0x30大小的堆块的时候就不会分配到这个地址上而是从Top Chunk里拆分那么事实上是怎么样的呢实践出真知看一下吧
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x41Top chunk | PREV_INUSE
Addr: 0x555555758040
Size: 0x20fc1pwndbg bins
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000041
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000020fc1 Top Chunk
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 显然Top Chunk并未被拆分这里确定了似乎malloc(0x30)得到的堆块是原Chunk1的地址这里说明了这里的原chunk1因为size域被修改了之后成为了一个新的更大的堆块这里也就造成了所谓的堆重叠了chunk1因为修改了size域后生成的那个新的chunk和chunk2部分重叠了这也就导致了有的对原chunk1的修改可以修改到chunk2的地方如果chunk2保留了指针那就可以对chunk2进行伪造可以结合类似off by one和UAF形成很多种利用方式。
2、对inuse的smallbin进行extend
//gcc -g 2.c
//注意把之前那个a.out给删掉
int main()
{void *ptr,*ptr1;ptrmalloc(0x80);//分配第一个 0x80 的chunk1malloc(0x10); //分配第二个 0x10 的chunk2malloc(0x10); //防止与top chunk合并*(long *)((long)ptr-0x8)0xb1;free(ptr);ptr1malloc(0xa0);
} 首先进行三次分配其中第三次分配是防止extend后chunk与topchunk进行合并无需关注。先看看经过三次malloc之后的堆空间是啥样的
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x91Allocated chunk | PREV_INUSE
Addr: 0x555555758090
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x5555557580d0
Size: 0x20f31pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/40gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000091 Chunk1
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000021 Chunk2
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000021 Chunk3
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000020f31 Top Chunk
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x0000000000000000 估摸一下chunk1的大小似乎有点大导致free掉的chunk1并不会进入fastbin而是进入smallbin那么修改了size域后原本三个chunk在gdb里的heap指令下依旧少了一个:
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0xb1Allocated chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x5555557580d0
Size: 0x20f31pwndbg bins
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/40gx 0x555555758000
0x555555758000: 0x0000000000000000 0x00000000000000b1 Chunk1
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000021 Chunk2
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000021 Chunk3
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000020f31 Top Chunk
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x0000000000000000 下一步free掉chunk1
pwndbg heap
Free chunk (unsortedbin) | PREV_INUSE
Addr: 0x555555758000
Size: 0xb1
fd: 0x7ffff7dd1b78
bk: 0x7ffff7dd1b78Allocated chunk
Addr: 0x5555557580b0
Size: 0x20Top chunk | PREV_INUSE
Addr: 0x5555557580d0
Size: 0x20f31pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x555555758000 —▸ 0x7ffff7dd1b78 (main_arena88) ◂— 0x555555758000
smallbins
empty
largebins
empty
pwndbg x/40gx 0x555555758000
0x555555758000: 0x0000000000000000 0x00000000000000b1 Chunk1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000021 Chunk2
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x00000000000000b0 0x0000000000000020 Chunk3
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000020f31 Top Chunk
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x0000000000000000 这里发现了一个点需要注意就是free掉size域修改了之后的那个chunk1之后chunk3的size域的最低为也就是p位变成了0这也就说明chunk1没有放在fastbin里上面也看到了被放在了unsortedbin里。
那么为啥会被放入unsortedbin内而不是smallbin呢估计有一下几种可能
当一个较大的chunk被分割成两半后如果剩下的部分大于MINSIZE就会被放到unsortedbin中。释放一个不属于fastbin的chunk并且该chunk不和top chunk紧邻时该chunk就会被放到unsorted bin 中当第二次分配的时候没有在unsortedbin中找到合适的才会被放入到其对应的bin中。
之后进行分配分配0xa0大小的堆块就会发现原chunk1的地址依旧拿去用了
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0xb1Allocated chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x5555557580d0
Size: 0x20f31pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/40gx 0x555555758000
0x555555758000: 0x0000000000000000 0x00000000000000b1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000021
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x00000000000000b0 0x0000000000000021
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000020f31
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x00000000000000003、对free的smallbin进行extend
//gcc -g 3.c
int main()
{void *ptr,*ptr1;ptrmalloc(0x80);//分配第一个0x80的chunk1malloc(0x10);//分配第二个0x10的chunk2free(ptr);//首先进行释放使得chunk1进入unsorted bin*(long *)((long)ptr-0x8)0xb1;ptr1malloc(0xa0);
} 首先是两次malloc
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x91Allocated chunk | PREV_INUSE
Addr: 0x555555758090
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x20f51pwndbg bins
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000091 Chunk1
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000021 Chunk2
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000020f51 Top Chunk
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 之后直接free掉chunk1
pwndbg heap
Free chunk (unsortedbin) | PREV_INUSE
Addr: 0x555555758000
Size: 0x91
fd: 0x7ffff7dd1b78
bk: 0x7ffff7dd1b78Allocated chunk
Addr: 0x555555758090
Size: 0x20Top chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x20f51pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x555555758000 —▸ 0x7ffff7dd1b78 (main_arena88) ◂— 0x555555758000
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000091 Chunk1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000090 0x0000000000000020 Chunk2
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000020f51 Top Chunk
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 这里还是能看出来存在两个chunk的当修改了size域大小后
pwndbg heap
Free chunk (unsortedbin) | PREV_INUSE
Addr: 0x555555758000
Size: 0xb1
fd: 0x7ffff7dd1b78
bk: 0x7ffff7dd1b78Top chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x20f51pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x555555758000 —▸ 0x7ffff7dd1b78 (main_arena88) ◂— 0x555555758000
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x00000000000000b1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000090 0x0000000000000020
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000020f51
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 原本的三个chunk变成了两个并且chunk2还是allocated状态重叠之后chunk1是free状态所以整个chunk依旧是free状态。之后malloc(0xa0)试试
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0xb1Top chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x20f51pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x00000000000000b1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000090 0x0000000000000020
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000020f51
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x00000000000000004、extend前向overlapping
//gcc -g 4.c
int main()
{void *ptr,*ptr1;ptrmalloc(0x10);//分配第1个 0x80 的chunk1malloc(0x10); //分配第2个 0x10 的chunk2malloc(0x10); //分配第3个 0x10 的chunk3malloc(0x10); //分配第4个 0x10 的chunk4 *(long *)((long)ptr-0x8)0x61;free(ptr);ptr1malloc(0x50);
} 还是老样子进行4次malloc看下heap和bin以及chunk的内容
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x555555758020
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x555555758040
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x555555758060
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758080
Size: 0x20f81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000021 Chunk1
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021 Chunk2
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000021 Chunk3
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000021 Chunk4
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000020f81 Top Chunk
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 之后修改size域
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x61Allocated chunk | PREV_INUSE
Addr: 0x555555758060
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758080
Size: 0x20f81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000061
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000021
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000021
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000020f81
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 之后free
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x61Allocated chunk | PREV_INUSE
Addr: 0x555555758060
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758080
Size: 0x20f81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000061
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000021
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000021
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000020f81
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x0000000000000000 之后重新malloc
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x61Allocated chunk | PREV_INUSE
Addr: 0x555555758060
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758080
Size: 0x20f81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/30gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000061
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000021
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000021
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000021
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000020f81
0x555555758090: 0x0000000000000000 0x0000000000000000
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000000
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000000
0x5555557580e0: 0x0000000000000000 0x00000000000000005、通过extend前向overlapping
//gcc -g 5.c
int main(void)
{void *ptr1,*ptr2,*ptr3,*ptr4;ptr1malloc(128);//smallbin1ptr2malloc(0x10);//fastbin1ptr3malloc(0x10);//fastbin2ptr4malloc(128);//smallbin2malloc(0x10);//防止与top合并free(ptr1);*(int *)((long long)ptr4-0x8)0x90;//修改pre_inuse域*(int *)((long long)ptr4-0x10)0xd0;//修改pre_size域free(ptr4);//unlink进行前向extendmalloc(0x150);//占位块
} 经过五次malloc之后
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x91Allocated chunk | PREV_INUSE
Addr: 0x555555758090
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x5555557580d0
Size: 0x91Allocated chunk | PREV_INUSE
Addr: 0x555555758160
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758180
Size: 0x20e81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
pwndbg x/54gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000091
0x555555758010: 0x0000000000000000 0x0000000000000000
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000000 0x0000000000000021
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000021
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000091
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x0000000000000000
0x555555758140: 0x0000000000000000 0x0000000000000000
0x555555758150: 0x0000000000000000 0x0000000000000000
0x555555758160: 0x0000000000000000 0x0000000000000021
0x555555758170: 0x0000000000000000 0x0000000000000000
0x555555758180: 0x0000000000000000 0x0000000000020e81
0x555555758190: 0x0000000000000000 0x0000000000000000
0x5555557581a0: 0x0000000000000000 0x0000000000000000 free了chunk1之后chunk2的p位已经变成0了
pwndbg heap
Free chunk (unsortedbin) | PREV_INUSE
Addr: 0x555555758000
Size: 0x91
fd: 0x7ffff7dd1b78
bk: 0x7ffff7dd1b78Allocated chunk
Addr: 0x555555758090
Size: 0x20Allocated chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x21Allocated chunk | PREV_INUSE
Addr: 0x5555557580d0
Size: 0x91Allocated chunk | PREV_INUSE
Addr: 0x555555758160
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758180
Size: 0x20e81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x555555758000 —▸ 0x7ffff7dd1b78 (main_arena88) ◂— 0x555555758000
smallbins
empty
largebins
empty
pwndbg x/54gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000091 Chunk1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000090 0x0000000000000020
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000021 Chunk2
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x0000000000000000 0x0000000000000091 Chunk3
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x0000000000000000
0x555555758140: 0x0000000000000000 0x0000000000000000
0x555555758150: 0x0000000000000000 0x0000000000000000
0x555555758160: 0x0000000000000000 0x0000000000000021 Chunk4
0x555555758170: 0x0000000000000000 0x0000000000000000
0x555555758180: 0x0000000000000000 0x0000000000020e81 Top Chunk
0x555555758190: 0x0000000000000000 0x0000000000000000
0x5555557581a0: 0x0000000000000000 0x0000000000000000 之后修改了chunk3的pre_inuse也就是size的最低为P位为0然后修改pre_size位为0xd8
pwndbg heap
Free chunk (unsortedbin) | PREV_INUSE
Addr: 0x555555758000
Size: 0x91
fd: 0x7ffff7dd1b78
bk: 0x7ffff7dd1b78Allocated chunk
Addr: 0x555555758090
Size: 0x20Allocated chunk | PREV_INUSE
Addr: 0x5555557580b0
Size: 0x21Allocated chunk
Addr: 0x5555557580d0
Size: 0x90Allocated chunk | PREV_INUSE
Addr: 0x555555758160
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758180
Size: 0x20e81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x555555758000 —▸ 0x7ffff7dd1b78 (main_arena88) ◂— 0x555555758000
smallbins
empty
largebins
empty
pwndbg x/54gx 0x555555758000
0x555555758000: 0x0000000000000000 0x0000000000000091 Chunk1
0x555555758010: 0x00007ffff7dd1b78 0x00007ffff7dd1b78
0x555555758020: 0x0000000000000000 0x0000000000000000
0x555555758030: 0x0000000000000000 0x0000000000000000
0x555555758040: 0x0000000000000000 0x0000000000000000
0x555555758050: 0x0000000000000000 0x0000000000000000
0x555555758060: 0x0000000000000000 0x0000000000000000
0x555555758070: 0x0000000000000000 0x0000000000000000
0x555555758080: 0x0000000000000000 0x0000000000000000
0x555555758090: 0x0000000000000090 0x0000000000000020
0x5555557580a0: 0x0000000000000000 0x0000000000000000
0x5555557580b0: 0x0000000000000000 0x0000000000000021 Chunk2
0x5555557580c0: 0x0000000000000000 0x0000000000000000
0x5555557580d0: 0x00000000000000d0 0x0000000000000090 Chunk3
0x5555557580e0: 0x0000000000000000 0x0000000000000000
0x5555557580f0: 0x0000000000000000 0x0000000000000000
0x555555758100: 0x0000000000000000 0x0000000000000000
0x555555758110: 0x0000000000000000 0x0000000000000000
0x555555758120: 0x0000000000000000 0x0000000000000000
0x555555758130: 0x0000000000000000 0x0000000000000000
0x555555758140: 0x0000000000000000 0x0000000000000000
0x555555758150: 0x0000000000000000 0x0000000000000000
0x555555758160: 0x0000000000000000 0x0000000000000021 Chunk4
0x555555758170: 0x0000000000000000 0x0000000000000000
0x555555758180: 0x0000000000000000 0x0000000000020e81 Top Chunk
0x555555758190: 0x0000000000000000 0x0000000000000000
0x5555557581a0: 0x0000000000000000 0x0000000000000000 可以看出来chunk3的pre_size域的大小刚好能够包含到完chunk1和chunk2。之后free掉了chunk3
pwndbg heap
Free chunk (unsortedbin) | PREV_INUSE
Addr: 0x555555758000
Size: 0x161
fd: 0x7ffff7dd1b78
bk: 0x7ffff7dd1b78Allocated chunk
Addr: 0x555555758160
Size: 0x20Top chunk | PREV_INUSE
Addr: 0x555555758180
Size: 0x20e81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x555555758000 —▸ 0x7ffff7dd1b78 (main_arena88) ◂— 0x555555758000
smallbins
empty
largebins
empty会发现前面的三个chunk都被合并成了一个这里主要是因为unlink的原因导致了chunk3和前面的两个主要是pre_size指定的大小范围内的chunk发生了合并。之后再进行malloc会分配走新的那个chunk1
pwndbg heap
Allocated chunk | PREV_INUSE
Addr: 0x555555758000
Size: 0x161Allocated chunk | PREV_INUSE
Addr: 0x555555758160
Size: 0x21Top chunk | PREV_INUSE
Addr: 0x555555758180
Size: 0x20e81pwndbg bin
fastbins
0x20: 0x0
0x30: 0x0
0x40: 0x0
0x50: 0x0
0x60: 0x0
0x70: 0x0
0x80: 0x0
unsortedbin
all: 0x0
smallbins
empty
largebins
empty
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