Linux Kernel Daily: Poly1305 Carry Fix and Regression Test
Linus Torvalds merged crypto library fixes from Eric Biggers correcting Poly1305 bugs including a lost carry bit on ARM64. The single focused update pairs the correction with a split-update regression test and tighter clearing of sensitive state.
Duration: PT2M8S
Episode overview
This episode is a short developer briefing from Linux Kernel Daily.
It explains recent repository work in plain language.
- Show: Linux Kernel Daily
- Published: 2026-10-15T06:01:05Z
- Audio duration: PT2M8S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Hello, it's October 15th, 2026, and this is Linux Kernel Daily.
There's no broad pattern across the tree today — a single merge carries the impact, correcting Poly thirteen-oh-five calculation errors and tightening handling of sensitive state.
Linus Torvalds merged a small crypto library fixes pull from Eric Biggers, documented as merge zero F C B zero five B. With no other pull request activity in the feed, this is a focused reliability update, not a feature cycle.
The highest-impact issue is on ARM sixty-four, where a carry bit could be lost when resuming the Neon accelerated state during a multi-part message. That matters because Poly thirteen-oh-five is a message authenticator used to prove data has not been tampered with. A wrong carry produces a wrong authentication tag,…
That fix is paired with a new regression test for split updates that exercise the carry and resume path. The test gives maintainers a repeatable check and gives downstream developers confidence that future optimizations to the vector code do not reintroduce the error. It also signals where to look if you saw…
A second hardening in the same pull changes the finalization step to use explicit memory clearing. In…
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