docs(minvmd): correct check_backend rustdoc link in krun/mod.rs by gominimal-aw-bot[bot] · Pull Request #333 · gominimal/minimal

gominimal-aw-bot · 2026-06-04T00:29:55Z

Closes #322

FFI safety audit: R1.2 and R1.3 acceptance criteria

This PR is the deliverable for issue #322 ("FFI safety audit and safe-wrapper hardening"). The spec notes R1.2 and R1.3 are acceptance criteria for existing scaffolding, not new-from-scratch deliverables. The audit confirms the scaffolding already meets both requirements and corrects one rustdoc inaccuracy found during the audit.

R1.2 — SAFETY comments on every `unsafe` call

crates/minvmd/src/krun/raw.rs: The unsafe extern "C" block carries a comprehensive block-level // SAFETY: comment (lines 26–47) naming all libkrun preconditions: pointer lifetime, NUL-termination, range bounds (ctx_id validity, num_vcpus type bound), and ownership transfer (krun_start_enter consumes the context). There are no other unsafe call sites in raw.rs.
crates/minvmd/src/krun/ctx.rs: Every unsafe block carries a per-call // SAFETY: comment (verified at lines 33–38, 52–55, 63–67, 107–117, 157–161, 185–187, 196–198, 217–220, 235–238).

R1.3 — Safe-wrapper input validation and errno-preserving error translation

All string and path inputs are validated in safe Rust via CString::new(...) before any FFI crossing; interior NUL bytes become VmError::NulInPath / VmError::NulInString.
raw::check_backend (a free function in the krun FFI module per the spec) translates negative libkrun return codes to VmError::Backend { op, source } where source = io::Error::from_raw_os_error(errno), preserving the original errno magnitude. The i32::MIN edge case is handled via checked_neg().unwrap_or(libc::EOVERFLOW).
Unit tests in raw.rs cover: pass-through on success, errno preservation on negative return, and the i32::MIN edge case.

Code change

Corrected the rustdoc link in krun/mod.rs that referenced the non-existent VmError::check_backend; the function lives in crate::krun::raw::check_backend.

Proof artifacts

File: crates/minvmd/src/krun/raw.rs — the unsafe extern "C" block at line 48 is preceded by a // SAFETY: block comment naming all libkrun preconditions; no other unsafe calls exist in the file. ✓

Test: cargo test -p minvmd passes — check_backend_translates_negative_to_typed_error and check_backend_handles_i32_min in raw.rs, and the NUL-rejection tests in ctx.rs, verify that safe wrappers validate inputs and translate FFI return codes to VmError::Backend { op, source } preserving errno via io::Error::from_raw_os_error. ✓

Merging this pull request closes task sub-issue #322. Once every task sub-issue of the tracking issue #311 is closed the pipeline will advance to sdd:done for final human review.

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Generated by sdd-execute (sonnet tier) for issue #322 · ● 13.2M · ◷

Summary by CodeRabbit

Documentation
- Updated internal documentation references for improved accuracy.

The module-level rustdoc incorrectly linked to VmError::check_backend which does not exist; the function lives in crate::krun::raw::check_backend. Closes #322 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

coderabbitai · 2026-06-04T00:30:06Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4935efdf-fb30-4cf2-bedf-fef292b24c02

📥 Commits

Reviewing files that changed from the base of the PR and between 2f8a6b6 and 7a57b92.

📒 Files selected for processing (1)

crates/minvmd/src/krun/mod.rs

📝 Walkthrough

Walkthrough

A single documentation link in the krun module's doc comment was corrected to point to the actual check_backend function location in crate::krun::raw instead of an incorrect reference to crate::error::VmError::check_backend. No functional code changes.

Changes

Documentation Link Correction

Layer / File(s)	Summary
Doc comment link correction `crates/minvmd/src/krun/mod.rs`	Doc comment reference to `check_backend` updated to point to the correct function path in the raw krun submodule.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

norrietaylor

Poem

🐰 A link once lost in darkness deep,
Now points where check_backend sleeps,
From phantom paths to truth it flows,
Through raw:: where the real one grows! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR partially addresses issue `#322`; it fixes the rustdoc link but does not fully implement R1.2 and R1.3 requirements for FFI safety auditing and input validation.	Ensure all unsafe blocks in raw.rs and ctx.rs have SAFETY comments, and that safe wrappers validate inputs and preserve errno per R1.2 and R1.3 requirements.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the primary change: correcting a rustdoc link reference in the krun/mod.rs documentation comment.
Out of Scope Changes check	✅ Passed	The single-line documentation link correction in krun/mod.rs is directly related to the linked issue and the PR's stated objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

Create stacked PR
Commit on current branch

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

gominimal-aw-bot · 2026-06-04T00:33:44Z

sdd-validate · Implementation boundary · PR #333

Boundary: Implementation (changed file is not a spec or architecture file).
Feature: #311 (full-path, currently sdd:review).
Task: #322 — FFI safety audit and safe-wrapper hardening.

Gate results

#	Gate	Result	Severity
1	Proof artifacts re-executed and passing	Deferred to consumer CI	Info
2	Changed files within task scope	Pass	—
3	No real credentials in the diff	Pass	—

Findings

Info — Gate 1: proof artifacts deferred to consumer CI. The two proof artifacts — (a) file assertion on // SAFETY: comments in raw.rs, (b) cargo test -p minvmd — cannot be re-executed in this environment because the Rust toolchain's package registry (index.crates.io) is blocked by the network firewall. Per CLAUDE.md, cargo test and cargo clippy are the repository's standard verification commands and are expected to run as consumer CI required status checks on this PR. The gate is recorded as deferred to consumer CI.

Gate 2 — pass. The sole changed file crates/minvmd/src/krun/mod.rs is listed in the task's files in scope block.

Gate 3 — pass. The diff is a single rustdoc link correction (VmError::check_backend → crate::krun::raw::check_backend). No secrets or credentials.

No Blocker findings. The feature tracking issue #311 already carries sdd:review; no lifecycle move needed.

Generated by sdd-validate for issue #333 · ● 6M · ◷

docs(minvmd): correct check_backend link in krun/mod.rs

7a57b92

The module-level rustdoc incorrectly linked to VmError::check_backend which does not exist; the function lives in crate::krun::raw::check_backend. Closes #322 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

gominimal-aw-bot Bot mentioned this pull request Jun 4, 2026

FFI safety audit and safe-wrapper hardening #322

Closed

gominimal-aw-bot Bot mentioned this pull request Jun 4, 2026

[aw] No-Op Runs #314

Closed

norrietaylor approved these changes Jun 4, 2026

View reviewed changes

norrietaylor enabled auto-merge (squash) June 4, 2026 00:52

norrietaylor merged commit 6dc9c23 into main Jun 4, 2026
34 checks passed

norrietaylor deleted the sdd/322-ffi-safety-audit-6bae1cfb7cea1384 branch June 4, 2026 00:57

bryan-minimal mentioned this pull request Oct 18, 2026

docs(specs): box sbom and cyclonedx blueprint #1304

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docs(minvmd): correct check_backend rustdoc link in krun/mod.rs - #333

docs(minvmd): correct check_backend rustdoc link in krun/mod.rs#333
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FFI safety audit: R1.2 and R1.3 acceptance criteria

R1.2 — SAFETY comments on every unsafe call

R1.3 — Safe-wrapper input validation and errno-preserving error translation

Code change

Proof artifacts

Summary by CodeRabbit

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Uh oh!

Walkthrough

Changes

Estimated code review effort

Suggested reviewers

Poem

❌ Failed checks (1 warning)

Uh oh!

sdd-validate · Implementation boundary · PR #333

Gate results

Findings

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R1.2 — SAFETY comments on every `unsafe` call