From 5299890ebe7fa641690d03e6873fc03dc86ba3ae Mon Sep 17 00:00:00 2001 From: Yuansheng Wang Date: Tue, 2 Jun 2026 12:59:03 +0800 Subject: [PATCH 1/4] Add fuzz_numbers target with boundary-focused number generation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Implements structured number fuzzing using the arbitrary crate to test RFC 8259 compliance and numeric decode correctness. Key features: - Boundary-biased generation (70%): exponent limits (1e308, 1e-308, 1e309, 1e-324), integer boundaries (i64::MAX±1, u64::MAX±1), leading zeros (00, 01), invalid signs (+1, --1) - Random generation (30%): arbitrary sign/integer/fraction/exponent combinations - Whitespace variation: tests numbers with various surrounding whitespace - Dual-mode validation: EAGER mode must reject RFC 8259 violations, LAZY mode defers to access time - Cross-validation: compares accept/reject decisions with serde_json - Extraction verification: validates decoded i64/f64 values match expected results Test vectors include: - Exponent boundaries: 1e308, 1e-308, 1e309 (overflow), 1e-324 (underflow) - Integer boundaries: i64::MAX, i64::MAX+1, i64::MIN, i64::MIN-1, u64::MAX, u64::MAX+1 - Leading zeros: 00, 01, -00 (invalid RFC 8259) - Invalid signs: +1, --1 - Decimal precision: up to 20-digit mantissas The fuzzer wraps generated numbers in JSON arrays [number] and tests both parse-time validation (EAGER vs LAZY) and access-time decode via qjson_get_i64/qjson_get_f64 FFI calls. --- fuzz/Cargo.lock | 238 +++++++++++++++ fuzz/Cargo.toml | 7 + fuzz/fuzz_targets/fuzz_numbers.rs | 467 ++++++++++++++++++++++++++++++ 3 files changed, 712 insertions(+) create mode 100644 fuzz/Cargo.lock create mode 100644 fuzz/fuzz_targets/fuzz_numbers.rs diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock new file mode 100644 index 0000000..878174b --- /dev/null +++ b/fuzz/Cargo.lock @@ -0,0 +1,238 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 4 + +[[package]] +name = "arbitrary" +version = "1.4.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1" +dependencies = [ + "derive_arbitrary", +] + +[[package]] +name = "cc" +version = "1.2.63" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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a/fuzz/Cargo.toml b/fuzz/Cargo.toml index 377d4ef..7f1caad 100644 --- a/fuzz/Cargo.toml +++ b/fuzz/Cargo.toml @@ -42,3 +42,10 @@ path = "fuzz_targets/fuzz_parse_lazy.rs" test = false doc = false bench = false + +[[bin]] +name = "fuzz_numbers" +path = "fuzz_targets/fuzz_numbers.rs" +test = false +doc = false +bench = false diff --git a/fuzz/fuzz_targets/fuzz_numbers.rs b/fuzz/fuzz_targets/fuzz_numbers.rs new file mode 100644 index 0000000..b969b1e --- /dev/null +++ b/fuzz/fuzz_targets/fuzz_numbers.rs @@ -0,0 +1,467 @@ +#![no_main] + +use arbitrary::{Arbitrary, Unstructured}; +use libfuzzer_sys::fuzz_target; +use qjson::doc::Document; +use qjson::ffi::*; +use qjson::options::{Options, QJSON_MODE_EAGER, QJSON_MODE_LAZY}; +use serde_json::Value; +use std::os::raw::c_char; + +const FUZZ_MAX_DEPTH: u32 = 128; + +#[derive(Debug, Clone)] +struct NumberSpec { + sign: Sign, + integer: IntegerPart, + fraction: Option, + exponent: Option, +} + +#[derive(Debug, Clone)] +enum Sign { + None, + Minus, + Plus, // Invalid RFC 8259 + DoubleMinus, // Invalid +} + +#[derive(Debug, Clone)] +enum IntegerPart { + Zero, + SingleDigit(u8), // 1-9 + MultiDigit(String), + LeadingZero(String), // Invalid: 01, 00, 001 +} + +#[derive(Debug, Clone)] +struct Exponent { + sign: ExpSign, + value: String, +} + +#[derive(Debug, Clone)] +enum ExpSign { + None, + Plus, + Minus, +} + +impl<'a> Arbitrary<'a> for NumberSpec { + fn arbitrary(u: &mut Unstructured<'a>) -> arbitrary::Result { + // Bias heavily toward boundary cases (70% of the time) + let use_boundary = u.ratio(7, 10)?; + + if use_boundary { + Self::arbitrary_boundary(u) + } else { + Self::arbitrary_random(u) + } + } +} + +impl NumberSpec { + fn arbitrary_boundary(u: &mut Unstructured) -> arbitrary::Result { + let choice = u.int_in_range(0..=15)?; + + Ok(match choice { + // Exponent boundaries + 0 => Self::from_str("1e308"), // Near f64::MAX + 1 => Self::from_str("1e-308"), // Near f64::MIN_POSITIVE + 2 => Self::from_str("1e309"), // f64 overflow + 3 => Self::from_str("1e-324"), // f64 underflow (subnormal) + 4 => Self::from_str("-1e308"), + + // Integer boundaries + 5 => Self::from_str("9223372036854775807"), // i64::MAX + 6 => Self::from_str("9223372036854775808"), // i64::MAX + 1 + 7 => Self::from_str("-9223372036854775808"), // i64::MIN + 8 => Self::from_str("-9223372036854775809"), // i64::MIN - 1 + 9 => Self::from_str("18446744073709551615"), // u64::MAX + 10 => Self::from_str("18446744073709551616"), // u64::MAX + 1 + + // Leading zeros (invalid) + 11 => Self { sign: Sign::None, integer: IntegerPart::LeadingZero("00".into()), fraction: None, exponent: None }, + 12 => Self { sign: Sign::None, integer: IntegerPart::LeadingZero("01".into()), fraction: None, exponent: None }, + 13 => Self { sign: Sign::Minus, integer: IntegerPart::LeadingZero("00".into()), fraction: None, exponent: None }, + + // Sign variations (invalid) + 14 => Self { sign: Sign::Plus, integer: IntegerPart::SingleDigit(1), fraction: None, exponent: None }, + 15 => Self { sign: Sign::DoubleMinus, integer: IntegerPart::SingleDigit(1), fraction: None, exponent: None }, + + _ => unreachable!(), + }) + } + + fn arbitrary_random(u: &mut Unstructured) -> arbitrary::Result { + let sign = match u.int_in_range(0..=10)? { + 0 => Sign::Plus, + 1 => Sign::DoubleMinus, + 2..=4 => Sign::Minus, + _ => Sign::None, + }; + + let integer = match u.int_in_range(0..=10)? { + 0 => IntegerPart::LeadingZero(format!("0{}", u.int_in_range(0..=999)?)), + 1 => IntegerPart::LeadingZero("00".into()), + 2 => IntegerPart::Zero, + 3..=5 => IntegerPart::SingleDigit(u.int_in_range(1..=9)?), + _ => { + let len = u.int_in_range(1..=20)?; + let first = u.int_in_range(1..=9)?; + let mut s = first.to_string(); + for _ in 0..len { + s.push_str(&u.int_in_range(0..=9)?.to_string()); + } + IntegerPart::MultiDigit(s) + } + }; + + let fraction = if u.ratio(1, 3)? { + let len = u.int_in_range(1..=20)?; + let mut s = String::new(); + for _ in 0..len { + s.push_str(&u.int_in_range(0..=9)?.to_string()); + } + Some(s) + } else { + None + }; + + let exponent = if u.ratio(1, 3)? { + let sign = match u.int_in_range(0..=2)? { + 0 => ExpSign::Plus, + 1 => ExpSign::Minus, + _ => ExpSign::None, + }; + let value = u.int_in_range(0..=350)?.to_string(); + Some(Exponent { sign, value }) + } else { + None + }; + + Ok(Self { sign, integer, fraction, exponent }) + } + + fn from_str(s: &str) -> Self { + let mut chars = s.chars().peekable(); + let sign = if chars.peek() == Some(&'-') { + chars.next(); + Sign::Minus + } else { + Sign::None + }; + + let mut int_str = String::new(); + while let Some(&c) = chars.peek() { + if c.is_ascii_digit() { + int_str.push(c); + chars.next(); + } else { + break; + } + } + + let integer = if int_str == "0" { + IntegerPart::Zero + } else if int_str.len() == 1 { + IntegerPart::SingleDigit(int_str.as_bytes()[0] - b'0') + } else { + IntegerPart::MultiDigit(int_str) + }; + + let fraction = if chars.peek() == Some(&'.') { + chars.next(); + let mut frac = String::new(); + while let Some(&c) = chars.peek() { + if c.is_ascii_digit() { + frac.push(c); + chars.next(); + } else { + break; + } + } + Some(frac) + } else { + None + }; + + let exponent = if matches!(chars.peek(), Some(&'e') | Some(&'E')) { + chars.next(); + let exp_sign = match chars.peek() { + Some(&'+') => { chars.next(); ExpSign::Plus }, + Some(&'-') => { chars.next(); ExpSign::Minus }, + _ => ExpSign::None, + }; + let value: String = chars.collect(); + Some(Exponent { sign: exp_sign, value }) + } else { + None + }; + + Self { sign, integer, fraction, exponent } + } + + fn to_string(&self) -> String { + let mut s = String::new(); + + match &self.sign { + Sign::None => {}, + Sign::Minus => s.push('-'), + Sign::Plus => s.push('+'), + Sign::DoubleMinus => s.push_str("--"), + } + + match &self.integer { + IntegerPart::Zero => s.push('0'), + IntegerPart::SingleDigit(d) => s.push_str(&d.to_string()), + IntegerPart::MultiDigit(v) => s.push_str(v), + IntegerPart::LeadingZero(v) => s.push_str(v), + } + + if let Some(frac) = &self.fraction { + s.push('.'); + s.push_str(frac); + } + + if let Some(exp) = &self.exponent { + s.push('e'); + match exp.sign { + ExpSign::None => {}, + ExpSign::Plus => s.push('+'), + ExpSign::Minus => s.push('-'), + } + s.push_str(&exp.value); + } + + s + } + + fn is_rfc8259_valid(&self) -> bool { + // Check sign + if !matches!(self.sign, Sign::None | Sign::Minus) { + return false; + } + + // Check leading zeros + match &self.integer { + IntegerPart::LeadingZero(_) => return false, + IntegerPart::MultiDigit(s) if s.starts_with('0') => return false, + _ => {}, + } + + // Fraction must have at least one digit if present + if let Some(frac) = &self.fraction { + if frac.is_empty() { + return false; + } + } + + // Exponent must have at least one digit if present + if let Some(exp) = &self.exponent { + if exp.value.is_empty() { + return false; + } + } + + true + } +} + +#[derive(Debug)] +struct TestCase { + number: NumberSpec, + whitespace_prefix: &'static str, + whitespace_suffix: &'static str, +} + +impl<'a> Arbitrary<'a> for TestCase { + fn arbitrary(u: &mut Unstructured<'a>) -> arbitrary::Result { + let number = NumberSpec::arbitrary(u)?; + + let ws_choices = ["", " ", " ", "\t", "\n", "\r\n", " \t\n"]; + let whitespace_prefix = *u.choose(&ws_choices)?; + let whitespace_suffix = *u.choose(&ws_choices)?; + + Ok(TestCase { + number, + whitespace_prefix, + whitespace_suffix, + }) + } +} + +impl TestCase { + fn to_json(&self) -> String { + format!( + "[{}{}{}]", + self.whitespace_prefix, + self.number.to_string(), + self.whitespace_suffix + ) + } +} + +fuzz_target!(|test_case: TestCase| { + let json = test_case.to_json(); + let data = json.as_bytes(); + + // Test EAGER mode + let opts_eager = Options { mode: QJSON_MODE_EAGER, max_depth: FUZZ_MAX_DEPTH }; + let qjson_eager_result = Document::parse_with_options(data, &opts_eager); + let serde_result = serde_json::from_slice::(data); + + let is_rfc8259_valid = test_case.number.is_rfc8259_valid(); + + // EAGER mode should reject RFC 8259 violations + if !is_rfc8259_valid { + if qjson_eager_result.is_ok() { + panic!( + "EAGER mode accepted invalid RFC 8259 number: {:?}\njson: {}", + test_case.number, json + ); + } + // serde_json should also reject + if serde_result.is_ok() { + panic!( + "serde_json accepted invalid RFC 8259 number (qjson correctly rejected): {:?}\njson: {}", + test_case.number, json + ); + } + return; // Both correctly rejected, done + } + + // For valid RFC 8259 numbers, check accept/reject consistency + let qjson_eager_ok = qjson_eager_result.is_ok(); + let serde_ok = serde_result.is_ok(); + + // Allow divergence when serde rejects out-of-range numbers + if qjson_eager_ok != serde_ok { + if qjson_eager_ok && !serde_ok { + let err_msg = serde_result.as_ref().err().unwrap().to_string(); + if !err_msg.contains("number out of range") { + panic!( + "EAGER/serde mismatch: qjson_ok={} serde_ok={} serde_err={:?}\nnumber: {:?}\njson: {}", + qjson_eager_ok, serde_ok, err_msg, test_case.number, json + ); + } + } else { + panic!( + "EAGER/serde mismatch: qjson_ok={} serde_ok={}\nnumber: {:?}\njson: {}", + qjson_eager_ok, serde_ok, test_case.number, json + ); + } + } + + // Test LAZY mode (only for valid RFC 8259) + let opts_lazy = Options { mode: QJSON_MODE_LAZY, max_depth: FUZZ_MAX_DEPTH }; + let qjson_lazy_result = Document::parse_with_options(data, &opts_lazy); + + // LAZY mode should accept structurally valid JSON (brackets/quotes balanced) + // but may defer number validation to access time + let qjson_lazy_ok = qjson_lazy_result.is_ok(); + + // If both qjson modes parsed successfully, test number extraction + if qjson_eager_ok && qjson_lazy_ok { + test_number_extraction(&json, &test_case.number); + } + + // LAZY should be more permissive than EAGER for number-level issues + // (but both will reject bracket/quote imbalance equally) + if qjson_eager_ok && !qjson_lazy_ok { + panic!( + "EAGER succeeded but LAZY failed (LAZY should be more permissive): number: {:?}\njson: {}", + test_case.number, json + ); + } +}); + +fn test_number_extraction(json: &str, number_spec: &NumberSpec) { + let mut err = qjson_error::default(); + let doc = unsafe { + qjson_parse( + json.as_ptr(), + json.len(), + &mut err + ) + }; + + if doc.is_null() { + return; // Parse failed, already tested above + } + + // Extract number at index 0 in the array + let path = b"0"; + + // Try i64 extraction + let mut i64_val: i64 = 0; + let i64_rc = unsafe { + qjson_get_i64( + doc, + path.as_ptr() as *const c_char, + path.len(), + &mut i64_val + ) + }; + + // Try f64 extraction + let mut f64_val: f64 = 0.0; + let f64_rc = unsafe { + qjson_get_f64( + doc, + path.as_ptr() as *const c_char, + path.len(), + &mut f64_val + ) + }; + + // If i64 succeeded, verify the value makes sense + if i64_rc == 0 { + // The extracted value should match when we parse with serde_json + if let Ok(serde_val) = serde_json::from_str::(json) { + if let Some(arr) = serde_val.as_array() { + if let Some(num) = arr.get(0).and_then(|v| v.as_i64()) { + if i64_val != num { + panic!( + "i64 mismatch: qjson={} serde={} number: {:?}\njson: {}", + i64_val, num, number_spec, json + ); + } + } + } + } + } + + // If f64 succeeded, verify it's finite and reasonable + if f64_rc == 0 { + if !f64_val.is_finite() { + panic!( + "f64 extraction returned non-finite value: {} for number: {:?}\njson: {}", + f64_val, number_spec, json + ); + } + + // Cross-check with serde_json + if let Ok(serde_val) = serde_json::from_str::(json) { + if let Some(arr) = serde_val.as_array() { + if let Some(num) = arr.get(0).and_then(|v| v.as_f64()) { + // Allow small floating point differences + let rel_error = if num == 0.0 { + (f64_val - num).abs() + } else { + ((f64_val - num) / num).abs() + }; + + if rel_error > 1e-10 && (f64_val - num).abs() > 1e-10 { + panic!( + "f64 mismatch: qjson={} serde={} rel_error={} number: {:?}\njson: {}", + f64_val, num, rel_error, number_spec, json + ); + } + } + } + } + } + + unsafe { qjson_free(doc) }; +} From 6ab54a7b26bd2eb4e3bf99a648c9f183941c0831 Mon Sep 17 00:00:00 2001 From: Yuansheng Wang Date: Tue, 2 Jun 2026 13:00:41 +0800 Subject: [PATCH 2/4] fuzz: seed fuzz_numbers corpus with JSON Test Suite number cases Add 10 i_number_*.json files from JSONTestSuite as initial corpus: - Edge cases for huge exponents (positive and negative) - Overflow and underflow scenarios - Very large integers beyond standard limits These seed inputs target number parsing edge cases in the fuzz_numbers harness. --- fuzz/corpus/fuzz_numbers/i_number_double_huge_neg_exp.json | 1 + fuzz/corpus/fuzz_numbers/i_number_huge_exp.json | 1 + fuzz/corpus/fuzz_numbers/i_number_neg_int_huge_exp.json | 1 + fuzz/corpus/fuzz_numbers/i_number_pos_double_huge_exp.json | 1 + fuzz/corpus/fuzz_numbers/i_number_real_neg_overflow.json | 1 + fuzz/corpus/fuzz_numbers/i_number_real_pos_overflow.json | 1 + fuzz/corpus/fuzz_numbers/i_number_real_underflow.json | 1 + fuzz/corpus/fuzz_numbers/i_number_too_big_neg_int.json | 1 + fuzz/corpus/fuzz_numbers/i_number_too_big_pos_int.json | 1 + fuzz/corpus/fuzz_numbers/i_number_very_big_negative_int.json | 1 + 10 files changed, 10 insertions(+) create mode 100644 fuzz/corpus/fuzz_numbers/i_number_double_huge_neg_exp.json create mode 100644 fuzz/corpus/fuzz_numbers/i_number_huge_exp.json create mode 100755 fuzz/corpus/fuzz_numbers/i_number_neg_int_huge_exp.json create mode 100755 fuzz/corpus/fuzz_numbers/i_number_pos_double_huge_exp.json create mode 100644 fuzz/corpus/fuzz_numbers/i_number_real_neg_overflow.json create mode 100644 fuzz/corpus/fuzz_numbers/i_number_real_pos_overflow.json create mode 100644 fuzz/corpus/fuzz_numbers/i_number_real_underflow.json create mode 100644 fuzz/corpus/fuzz_numbers/i_number_too_big_neg_int.json create mode 100644 fuzz/corpus/fuzz_numbers/i_number_too_big_pos_int.json create mode 100755 fuzz/corpus/fuzz_numbers/i_number_very_big_negative_int.json diff --git a/fuzz/corpus/fuzz_numbers/i_number_double_huge_neg_exp.json b/fuzz/corpus/fuzz_numbers/i_number_double_huge_neg_exp.json new file mode 100644 index 0000000..ae4c7b7 --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_double_huge_neg_exp.json @@ -0,0 +1 @@ +[123.456e-789] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_huge_exp.json b/fuzz/corpus/fuzz_numbers/i_number_huge_exp.json new file mode 100644 index 0000000..9b5efa2 --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_huge_exp.json @@ -0,0 +1 @@ +[0.4e00669999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999969999999006] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_neg_int_huge_exp.json b/fuzz/corpus/fuzz_numbers/i_number_neg_int_huge_exp.json new file mode 100755 index 0000000..3abd58a --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_neg_int_huge_exp.json @@ -0,0 +1 @@ +[-1e+9999] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_pos_double_huge_exp.json b/fuzz/corpus/fuzz_numbers/i_number_pos_double_huge_exp.json new file mode 100755 index 0000000..e10a7eb --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_pos_double_huge_exp.json @@ -0,0 +1 @@ +[1.5e+9999] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_real_neg_overflow.json b/fuzz/corpus/fuzz_numbers/i_number_real_neg_overflow.json new file mode 100644 index 0000000..3d628a9 --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_real_neg_overflow.json @@ -0,0 +1 @@ +[-123123e100000] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_real_pos_overflow.json b/fuzz/corpus/fuzz_numbers/i_number_real_pos_overflow.json new file mode 100644 index 0000000..54d7d3d --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_real_pos_overflow.json @@ -0,0 +1 @@ +[123123e100000] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_real_underflow.json b/fuzz/corpus/fuzz_numbers/i_number_real_underflow.json new file mode 100644 index 0000000..c5236eb --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_real_underflow.json @@ -0,0 +1 @@ +[123e-10000000] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_too_big_neg_int.json b/fuzz/corpus/fuzz_numbers/i_number_too_big_neg_int.json new file mode 100644 index 0000000..dfa3846 --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_too_big_neg_int.json @@ -0,0 +1 @@ +[-123123123123123123123123123123] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_too_big_pos_int.json b/fuzz/corpus/fuzz_numbers/i_number_too_big_pos_int.json new file mode 100644 index 0000000..338a8c3 --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_too_big_pos_int.json @@ -0,0 +1 @@ +[100000000000000000000] \ No newline at end of file diff --git a/fuzz/corpus/fuzz_numbers/i_number_very_big_negative_int.json b/fuzz/corpus/fuzz_numbers/i_number_very_big_negative_int.json new file mode 100755 index 0000000..e2d9738 --- /dev/null +++ b/fuzz/corpus/fuzz_numbers/i_number_very_big_negative_int.json @@ -0,0 +1 @@ +[-237462374673276894279832749832423479823246327846] \ No newline at end of file From 8e277a13d021710553b4bdc778e286d980a36548 Mon Sep 17 00:00:00 2001 From: Yuansheng Wang Date: Tue, 2 Jun 2026 13:01:38 +0800 Subject: [PATCH 3/4] ci: add fuzz_numbers to timed fuzzing schedule Add fuzz_numbers target to the weekly fuzzing workflow. The target exercises number parsing edge cases including large exponents, precision boundaries, and RFC 8259 compliance. --- .github/workflows/fuzz.yml | 1 + 1 file changed, 1 insertion(+) diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml index 03b4490..5231387 100644 --- a/.github/workflows/fuzz.yml +++ b/.github/workflows/fuzz.yml @@ -66,4 +66,5 @@ jobs: cargo +nightly fuzz run fuzz_parse_eager -- -max_total_time="$max_total_time" cargo +nightly fuzz run fuzz_depth -- -max_total_time="$max_total_time" cargo +nightly fuzz run fuzz_ffi_ops -- -max_total_time="$max_total_time" + cargo +nightly fuzz run fuzz_numbers -- -max_total_time="$max_total_time" cargo +nightly fuzz run fuzz_parse_lazy -- -max_total_time="$max_total_time" From 3633fe82d1044e29534283aa7b96c3bbc5241588 Mon Sep 17 00:00:00 2001 From: Yuansheng Wang Date: Tue, 2 Jun 2026 13:05:51 +0800 Subject: [PATCH 4/4] fuzz: fix f64 comparison logic and broaden serde divergence allowlist --- fuzz/fuzz_targets/fuzz_numbers.rs | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-) diff --git a/fuzz/fuzz_targets/fuzz_numbers.rs b/fuzz/fuzz_targets/fuzz_numbers.rs index b969b1e..aedff21 100644 --- a/fuzz/fuzz_targets/fuzz_numbers.rs +++ b/fuzz/fuzz_targets/fuzz_numbers.rs @@ -335,11 +335,15 @@ fuzz_target!(|test_case: TestCase| { let qjson_eager_ok = qjson_eager_result.is_ok(); let serde_ok = serde_result.is_ok(); - // Allow divergence when serde rejects out-of-range numbers + // Allow divergence when serde rejects for reasons qjson handles differently: + // - "number out of range": serde's f64 model is stricter + // - "invalid number": serde may reject some edge cases differently if qjson_eager_ok != serde_ok { if qjson_eager_ok && !serde_ok { let err_msg = serde_result.as_ref().err().unwrap().to_string(); - if !err_msg.contains("number out of range") { + let allowed_divergence = err_msg.contains("number out of range") + || err_msg.contains("invalid number"); + if !allowed_divergence { panic!( "EAGER/serde mismatch: qjson_ok={} serde_ok={} serde_err={:?}\nnumber: {:?}\njson: {}", qjson_eager_ok, serde_ok, err_msg, test_case.number, json @@ -445,17 +449,20 @@ fn test_number_extraction(json: &str, number_spec: &NumberSpec) { if let Ok(serde_val) = serde_json::from_str::(json) { if let Some(arr) = serde_val.as_array() { if let Some(num) = arr.get(0).and_then(|v| v.as_f64()) { - // Allow small floating point differences - let rel_error = if num == 0.0 { - (f64_val - num).abs() - } else { - ((f64_val - num) / num).abs() - }; - - if rel_error > 1e-10 && (f64_val - num).abs() > 1e-10 { + // Skip infinite values from serde (e.g., 1e999) + if !num.is_finite() { + return; + } + + // Allow small floating point differences (use OR to catch both + // small and large magnitude cases) + let abs_error = (f64_val - num).abs(); + let rel_error = if num == 0.0 { abs_error } else { abs_error / num.abs() }; + + if rel_error > 1e-10 || abs_error > 1e-10 { panic!( - "f64 mismatch: qjson={} serde={} rel_error={} number: {:?}\njson: {}", - f64_val, num, rel_error, number_spec, json + "f64 mismatch: qjson={} serde={} rel_error={} abs_error={} number: {:?}\njson: {}", + f64_val, num, rel_error, abs_error, number_spec, json ); } }