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fix back

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firmianay 2018-03-20 12:33:11 +08:00
parent 663ff89121
commit 61348864dd
1 changed files with 1 additions and 1 deletions
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doc/3.3.6_heap_exploit_1.md
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@ -622,7 +622,7 @@ BK->fd = FD
```
chunk0_ptr = P = P->fd
```
成功地修改了 chunk0_ptr，这时 `chunk0_ptr[0]` 和 `chunk0_ptr[3]` 实际上就是同一东西：
成功地修改了 chunk0_ptr，这时 `chunk0_ptr` 和 `chunk0_ptr[3]` 实际上就是同一东西。这里可能会有疑惑为什么这两个东西是一样的，因为 `chunk0_ptr` 指针在是放在数据段上的，地址在 `0x601070`，指向 `0x601058`，而 `chunk0_ptr[3]` 的意思是从 `chunk0_ptr` 指向的地方开始数 3 个单位，所以 `0x601058+0x08*3=0x601070`：
```
gef➤ x/40gx 0x602010-0x10
0x602000: 0x0000000000000000 0x0000000000000091 <-- chunk 0