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lab8 sort
嘿 大大又是我 解了一個月還是想不出來
stack = array.pop(array.index(max(array, key=abs)))
libc = array.pop(array.index(max(array, key=abs))) - 0x21b97
我問題是這兩行 不懂用途
是leak libc的 base address 嗎?
如果是leak 那位甚要在 這裡leak
而且我發現 它arr[10000] 程式其實給 10005個
那多出來的5的 我也不知道裡面的值是從哪裡來的 是殘值 還是有意義的東西
我回去翻了lab7 但是沒得到太多有用的
感謝大大解答
why canary place will change
lab8 sort
用r2看
var int local_138a8h @ rbp-0x138a8
var int local_138a0h @ rbp-0x138a0
var int local_20h @ rbp-0x20 這是name
var int local_8h @ rbp-0x8 這是canay
arg int arg_138a0h @ rbp+0x138a0 這是arr[]
- 為甚不能只leak arr[10005] 就好
- 要像下面一樣 先找 絕對值後最大值 去做處理
canary = array.pop(array.index(max(array, key=abs)))
if canary < 0:
canary += 0xffffffffffffffff + 1
log.info(hex(canary))
而我用了解答 發現 canary 位置 會出現在 arr[0] 或 arr[10005]
我是看了台科的過來
希望大大可以幫我解答
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