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Informational 21 Bitcoin

refactor(core): enforce layout scoping for more Rust layouts

Public commit record

What the developer wrote

Authored by Roman Zeyde

93/100 · Strong
refactor(core): enforce layout scoping for more Rust layouts

Following https://github.com/trezor/trezor-firmware/pull/6812.

Also, fixup `error_popup()` return value, since it is unused.

[no changelog]
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Provides detailed explanatory context✓ Links an issue, advisory, or supporting reference
The short version

What changed, and why it matters

This commit is a code cleanup that wraps more on-screen UI layouts in a new 'layout context' scoping mechanism. It changes how layout objects are created and awaited, but does not add or remove security checks. The main risk is that any mistake in the refactor could cause a layout to be used outside its intended scope, but the diff itself shows consistent mechanical changes rather than a security fix or vulnerability.

Recommended action

Treat as a routine refactor. Reviewers should verify that every `with ... as layout:` block correctly awaits the layout before exiting the context, and that no layout object is returned or used outside its scope. Regression testing of affected flows (backup, recovery, FIDO2, address display, PIN mismatch popups) is appropriate, but no immediate security response is indicated.

Security signals we found

01

Large refactor touching UI layout lifecycle across multiple product variants (bolt, caesar, delizia, eckhart)

02

Context-manager scoping may be a defensive pattern to prevent use-after-free or concurrent layout misuse

03

No explicit security relevance stated by vendor; marked [no changelog]

04

No changes to input validation, crypto, or authorization logic visible in diff

Risk score

Why this scored 21/100

Our methodology →
Potential impact 3/30
Exploitability 2/25
Stealth signal 2/15
Affected reach 5/15
Confidence 6/10
Evidence quality 3/5
Human-validated context

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