[$] BPF loop verification with scalar evolution
Date:
Tue, 09 Jun 2026 13:37:36 +0000
Description:
The BPF verifier has, in the course of wrestling with the difficult problem of statically analyzing loops, grown special support for many kinds of loops
over its
history, but its fundamental approach to simple for loops has not
changed.
When it encounters a loop, it evaluates it, iteration by iteration, until reaching
an exit condition a process that can cause the verifier to mistakenly hit the limit on the number of allowed instructions where a better implementation
would not.
Eduard Zingerman
spoke at the 2026 Linux Storage, Filesystem, Memory-Management, and BPF
Summit about his in-progress work on improving the verifier's treatment of loops, especially nested
loops.
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Link to news story:
https://lwn.net/Articles/1076121/
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