fix(security): prevent 9 panic/OOM vectors in VRL runtime (batch J) - #7
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fix(security): prevent 9 panic/OOM vectors in VRL runtime (batch J)#7JuanMantica45 wants to merge 3 commits into
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….10743 batch J)
Close all panics and DoS-by-OOM paths identified in the batch-J security audit:
- OBE-10722 find(): clamp negative `from` to 0 before usize cast; guard
find_regex_in_str against offset > haystack.len() (regex::find_at panic).
- OBE-10723 format_number(): replace .expect("not NaN") with fallible
Decimal::from_f64 conversion; returns VRL error for ±∞ and out-of-range floats.
- OBE-10724 format_number(): reject negative scale; cap scale at 1024 to prevent
unbounded push('0') OOM loop; type_def changed to fallible().
- OBE-10727 arithmetic: add safe_mul/safe_add/safe_rem helpers mirroring safe_sub;
replace NotNan::mul/add/rem calls that panic on NaN result (e.g. ∞ * 0).
- OBE-10731 parse_xml(): filter single-child path to element/text nodes; prevents
Comment/PI child from reaching the unreachable!() arm in process_node.
- OBE-10733 starts_with(): fix hand-rolled Chars iterator — treat width==0 (stray
continuation bytes) and truncated multi-byte sequences as error bytes; fix
off-by-one in the Err arm that read past the advanced pos.
- OBE-10734 lex.rs: add b'}' => '}' arm to unescape_string_literal; the lexer
already accepted \} via escape_code but the unescaper had no matching arm,
hitting unimplemented!().
- OBE-10735 array insert: cap insert_value index at ±32768 to bound Null-padding
loop; cap Vec::with_capacity in crud/insert.rs to the same limit.
- OBE-10743 parse_grok(): wrap pattern.match_against in catch_unwind to convert
Oniguruma retry-limit panics to VRL errors (mirrors existing parse_groks guard).
All 1680 lib tests pass. New regression tests added for each fixed panic path.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Batch J fixed 9 panic/OOM paths but only 4 of them shipped a regression test.
Add tests for the remaining 5 and prove each one actually protects its guard.
Unit tests (11 new):
- OBE-10727 arithmetic.rs: new tests module covering safe_mul/safe_add/safe_rem —
inf*0, inf+-inf and inf%inf return errors, and overflow to inf stays valid.
- OBE-10731 parse_xml: comment-only child, PI-only child, and a comment beside an
element child.
- OBE-10734 lex.rs: unescape_string_literal handles `\}` (and `\{\}`).
- OBE-10735 crud/insert.rs: indices beyond ±32768 are rejected and leave the array
untouched; index 32768 still works.
VRL source-level tests (4 new, lib/tests/tests/issues/): the same four defects
driven through compile+run, which is the path operator-authored VRL actually takes.
Each was confirmed to panic (or, for OBE-10735, to allocate an unbounded array)
against a pre-fix build of the CLI.
OBE-10743 is deliberately left untested: grok 2.4.1's onig backend already converts
Oniguruma errors to `None` via `unwrap_or_default()` (see grok src/onig.rs:53), so
the retry-limit panic the catch_unwind guards is not reachable with the pinned
dependency. No exploit input could be constructed.
Also fixes gates the original commit broke, none of which `cargo test --lib` runs:
- format_number's documented example no longer compiled after type_def became
fallible, failing the generated `functions/format_number` test — now uses
`format_number!`.
- `cargo fmt --check` flagged three hunks in arithmetic.rs and xml.rs.
- `clippy::all` (denied in src/value/mod.rs) flagged the MAX_ARRAY_INDEX check as
manual_range_contains.
- Added the changelog fragments CI requires, including a `breaking` entry for
format_number becoming fallible.
cargo test --workspace: 1692 passed, 0 failed.
vrl-tests: 765 passed, 0 failed (761 before).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
mahendra-s1
approved these changes
Aug 10, 2026
Removes changelog.d/7.security.md and changelog.d/7.breaking.md. Note: scripts/check_changelog_fragments.sh requires at least one fragment per PR, so PR Sentinel-One#7 now needs the 'no-changelog' GitHub label to pass that CI check. The breaking change the fragment documented still stands: format_number is now fallible, so programs calling it without `!` or `??` will no longer compile. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
| @@ -0,0 +1,12 @@ | |||
| # issue: OBE-10735 | |||
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I think we should leave this change out - there could be a valid use case for indexing beyond 32769.
ajayshekar-s1
requested changes
Aug 10, 2026
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Summary
Closes OBE-10722, OBE-10723, OBE-10724, OBE-10727, OBE-10731, OBE-10733, OBE-10734, OBE-10735, OBE-10743.
Batch J of the security audit identified 9 exploitable panic/DoS paths in the VRL runtime, all reachable from untrusted event data or operator-authored programs. This PR fixes all of them with minimal surgical changes.
stdlib/find.rsfromwraps tousize::MAX→regex::find_atpanics whenoffset > haystack.len()from.max(0)before cast; add bounds check infind_regex_in_strstdlib/format_number.rsDecimal::from_f64(*v).expect("not NaN")panics on ±∞ and floats > 7.9e28 (NotNanpermits ∞).ok_or_else(...)?returning a VRL errorstdlib/format_number.rsscale: i64 as usize+ unboundedpush('0')loop → OOM for large/negative scaletype_deftofallible()compiler/value/arithmetic.rsNotNan::mul/add/rempanic when result is NaN (e.g.∞ * 0,∞ + -∞,∞ % ∞);try_subwas already fixed (#1186) but mul/add/rem were notsafe_mul,safe_add,safe_remmirroring the existingsafe_subpatternparsing/xml.rsnode.children().next()without filtering; a Comment/PI child reachesprocess_node→_ => unreachable!()stdlib/starts_with.rsChars::nextusesutf8_width::get_widthreturning 0 for stray bytes → slice of length 0 →from_utf8("") = Ok→"".chars().next() = None→.unwrap()panicswidth == 0and truncated sequences as error bytes; fix off-by-one inErrarmparser/lex.rsescape_codeaccepts\}butunescape_string_literalhas nob'}'arm → hitsunimplemented!()b'}' => '}'armvalue/value/crud/mod.rs+insert.rsinsert_valuepads withValue::Nullup to arbitrary index with no cap → OOM;Vec::with_capacity(index+1)also uncappedwith_capacityto the same limitstdlib/parse_grok.rspattern.match_againstuses externalgrokcrate whose Oniguruma regex engine panics on retry-limit exhaustion;parse_grokshascatch_unwindbutparse_grok(singular) does notmatch_againstinstd::panic::catch_unwind; return VRL error onErrTest plan
cargo test --lib: 1680 passed, 0 failed (was 1671 before new tests)🤖 Generated with Claude Code