The All-Thing

All stick and no carrot, since ought-three.

各位能夠讀中文得來賓您好。小的這還在學中文中,恐怕中文寫得不太好,希望你們還看得懂。


贈孟浩然 (李白)

吾愛孟夫子,風流天下聞。
紅顏棄軒冕,白首臥鬆雲。
醉月頻中聖,迷花不事君。
高山安可仰,徒此揖清芬。

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Wed, 04 Jun 2003
DOS by algorithmic complexity

Very cool research on forcing worst-case behavior from server-side data structures/algorithms, allowing for low-bandwidth DOS attacks. Mostly seems to focus on hash tables, but some other stuff in there as well. Various versions of Perl, glib, and others are all affected.

Seems mostly to apply to open-source software (because you know the implementation details, including choice of algorithm), but of course, this is ultimately a strength, and not a weakness, of OSS.

Just another datum on how difficult it is to write good software, and how subtle the problems can be.

Posted at 14:35 | trackback | (leave a comment) | back

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