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A hash-based DOS attack on Btrfs

Posted: December 13, 2012 / in: Linux / No comments

Pascal Junod has disclosed
a pair of denial-of-service attacks against the Btrfs filesystem based on
hash collisions. “I have created several files with random names in
a directory (around 500). The time required to remove them is
negligible. Then, I have created the same number of files, but giving them
only 55 different crc32c values. The time required to remove them is so
large that I was not able to figure it out and killed the process after 220
minutes (!).
” This is a local attack only, but administrators of
Btrfs-using sites with untrusted users may want to pay attention.

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