Harden archive entry parsing against integer overflows and panics#3030
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📝 WalkthroughWalkthroughIn ChangesTimestamp Overflow Safety
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Code Review
This pull request hardens archive parsing against integer overflows and panics by replacing unchecked arithmetic with checked and saturating operations. Key changes include using checked_add for timestamp calculations with explicit error handling and saturating_add for size and length calculations. Review feedback suggests using Option::map and Result::transpose for more idiomatic timestamp processing and warns that the use of is_none_or may break compatibility with Rust versions older than 1.82.0.
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🧹 Nitpick comments (1)
lib/src/entry.rs (1)
684-704: ⚡ Quick winConsider extracting the timestamp+nanos overflow combination into a helper.
The three blocks for
ctime/mtime/atimeare structurally identical and only differ in the field and error label. Extracting a small helper reduces duplication and prevents future divergence (e.g., one branch silently dropping the overflow check on a later edit).♻️ Proposed refactor
+ fn combine( + secs: Option<Duration>, + ns: Option<u32>, + field: &'static str, + ) -> io::Result<Option<Duration>> { + match secs { + Some(t) => t + .checked_add(Duration::nanoseconds(ns.unwrap_or(0) as i64)) + .map(Some) + .ok_or_else(|| { + io::Error::new( + io::ErrorKind::InvalidData, + format!("{field} overflow"), + ) + }), + None => Ok(None), + } + } + let ctime = combine(ctime, ctime_ns, "ctime")?; + let mtime = combine(mtime, mtime_ns, "mtime")?; + let atime = combine(atime, atime_ns, "atime")?; - let ctime = match ctime { - Some(t) => Some( - t.checked_add(Duration::nanoseconds(ctime_ns.unwrap_or(0) as _)) - .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "ctime overflow"))?, - ), - None => None, - }; - let mtime = match mtime { - Some(t) => Some( - t.checked_add(Duration::nanoseconds(mtime_ns.unwrap_or(0) as _)) - .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "mtime overflow"))?, - ), - None => None, - }; - let atime = match atime { - Some(t) => Some( - t.checked_add(Duration::nanoseconds(atime_ns.unwrap_or(0) as _)) - .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "atime overflow"))?, - ), - None => None, - };🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@lib/src/entry.rs` around lines 684 - 704, Extract the repeated pattern that adds nanoseconds and checks overflow into a small helper (e.g., a function like add_ts_with_nanos_checked) and use it for ctime, mtime, and atime; the helper should accept the Option<time> and the corresponding nanos Option (and a field name string for the error), call Duration::nanoseconds, use checked_add, and return io::Result<Option<...>> so you can replace the three match blocks with calls to that helper and produce errors like "<field> overflow" consistently.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Nitpick comments:
In `@lib/src/entry.rs`:
- Around line 684-704: Extract the repeated pattern that adds nanoseconds and
checks overflow into a small helper (e.g., a function like
add_ts_with_nanos_checked) and use it for ctime, mtime, and atime; the helper
should accept the Option<time> and the corresponding nanos Option (and a field
name string for the error), call Duration::nanoseconds, use checked_add, and
return io::Result<Option<...>> so you can replace the three match blocks with
calls to that helper and produce errors like "<field> overflow" consistently.
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.jules/sentinel.mdlib/src/entry.rs
Use `time::Duration::saturating_add` instead of `+` for ctime/mtime/atime when combining seconds (cTIM/mTIM/aTIM) with nanoseconds (cTNS/mTNS/aTNS) in `NormalEntry` parsing. `time::Duration` panics on i64 second overflow, but the upstream `nanos()` helper already rejects values `>= 1_000_000_000`, so the previous `+` cannot actually panic for any archive that passes existing chunk validation. The change is defense-in-depth: if `nanos()` is ever relaxed or upstream `time::Duration` semantics change, the parser stays total without introducing a new `InvalidData` error path that would reject archives that decode cleanly today. No behavior change for archives whose nanoseconds satisfy the existing 0..1_000_000_000 constraint.
ChanTsune
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🛡️ Sentinel: [CRITICAL/HIGH] Fix integer overflow and panic-on-malformed-input in archive parsing
🚨 Severity: HIGH
💡 Vulnerability: Unchecked arithmetic in archive entry parsing and splitting logic. Specifically, the
timecrate'sDurationaddition (+) panics on overflow, andusizeadditions for size/offset calculations were unchecked.🎯 Impact: A maliciously crafted archive with extreme timestamp values (e.g.,
i64::MAXseconds combined with nanoseconds) or very large chunk sizes could cause the archiver to panic and crash (DoS).🔧 Fix: Replaced unchecked additions with
checked_add(returningio::Error) for structured metadata andsaturating_addfor size/length calculations. Hardened chunk splitting logic to safely handle potential overflows during boundary checks.✅ Verification: Ran all unit and integration tests (
cargo test). Verified thatcargo clippyandcargo fmtpass. Manually verified (during development) that extreme duration values no longer cause panics. Addresses feedback from security code review.Recorded learnings in
.jules/sentinel.md.PR created automatically by Jules for task 3712612792793867657 started by @ChanTsune
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