Q. How does free know how much to free?
A. The malloc/free 會記住配置的記憶體大小,存放在data block 前
可以參考 glibc 的 malloc.c
HexRabbit
Q : List some problems that cannot be detected via static checks ?
A : 比如 buffer overrun:如果 buffer 大小固定,但是靜態分析無法預期使用者輸入的長度,因此輸入超過長度的字串,有可能造成錯誤或攻擊
具體攻擊手法可以參考
Naetw
同學相關文章
Q : Why does qtest restrict the usage free(NULL)
A : unit test 中必需考慮各種情況,好處是可以更清楚描述問題,在進行更複雜的操作 (i.e. 交換 list 中兩個節點或對象為 circular list) 更顯得重要,降低程式設計師的開發成本
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