[$] Verifier-state pruning in BPF
Date:
Tue, 23 Dec 2025 14:29:33 +0000
Description:
The BPF verifier works, on a theoretical level, by considering every possible path that a BPF program could take. As a practical matter, however, it needs to
do that in a reasonable amount of time. At the 2025 Linux Plumbers Conference , Mah Tardy and Paul Chaignon
gave a detailed explanation
( slides ; video ) of
the main mechanism that it uses to accomplish that: state pruning. They focused
on two optimizations that help reduce the number of paths the verifier needs to
check, and discussed some of the complications the optimizations introduced
to the verifier's
code.
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Link to news story:
https://lwn.net/Articles/1050779/
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