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Informational 18 Bitcoin

bitbox02: port C datetime formatting to Rust

BB1a04855e View source ↗
Public commit record

What the developer wrote

Authored by benma's agent

68/100 · Adequate
bitbox02: port C datetime formatting to Rust

Using the `time` dep. Binary size becomes slightly smaller.

Squashed: move bitbox02 datetime funcs to util::datetime

It is not Rust-based and not related to BitBox02 hardware
functionality, so we move it to the util crate.
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
The short version

What changed, and why it matters

This commit rewrites the BitBox02 firmware's date/time formatting from C to Rust and vendors several new Rust crates (time, deranged, powerfmt, num-conv) to do it. The change is described by the vendor as a code-quality and binary-size improvement, not a security fix. There is no direct evidence in the commit of a vulnerability being patched, but any rewrite of formatting code can in principle introduce subtle bugs such as buffer handling or timezone mistakes. The large amount of newly vendored code increases the supply-chain/bug surface that future audits should watch.

Recommended action

Treat as a routine refactor. Review the new `util::datetime` implementation and the vendored `time` crate configuration for no_std/no-alloc correctness, panic paths, and timezone handling. Run existing backup/restore tests and add edge-case tests for epoch-to-string conversion. No urgent security action is indicated by the commit itself.

Security signals we found

01

Large third-party dependency vendoring increases audit surface

02

Rewrite of formatting code could introduce subtle correctness bugs

03

No explicit security fix or vulnerability disclosure in commit message

04

No unsafe Rust or C interop changes visible in the supplied diff portions

Risk score

Why this scored 18/100

Our methodology →
Potential impact 2/30
Exploitability 1/25
Stealth signal 1/15
Affected reach 3/15
Confidence 8/10
Evidence quality 3/5
Human-validated context

Community notes

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