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TheRealKeyboardWarrior avatar TheRealKeyboardWarrior commented on June 15, 2024

Rediscovered
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14236&start=200

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TheRealKeyboardWarrior avatar TheRealKeyboardWarrior commented on June 15, 2024

@guyharris
Morris Traversal instead of recursion?
https://www.educative.io/edpresso/what-is-morris-traversal

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mcr avatar mcr commented on June 15, 2024

If I understand this, the "attack" is on the command line, or as input to the libpcap compiler. (The oss-fuzz description was completely useless)

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TheRealKeyboardWarrior avatar TheRealKeyboardWarrior commented on June 15, 2024

pcap_compile() -> bpf_optimize() -> opt_init() -> count_blocks()

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guyharris avatar guyharris commented on June 15, 2024

... count_blocks()

...which recursively walks the control-flow graph for the program.

Note that it's a DAG, not a tree. I'd have to look some more at the Morris algorithm to see to what extent that's an issue. Nodes are marked to make sure they're not visited more than once (if you do a depth-first traversal, you may traverse end nodes more than once, for example; there may be multiple ways to either match a packet or fail to match a packet, so there may be multiple paths to the two end nodes).

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