seq: fuzz PreciseNumber::from_str (uutils#6183)

* fuzz the seq parse number functions

* run fuzz_parse_number into the CI

.github/workflows/fuzzing.yml

@@ -58,6 +58,8 @@ jobs:
           - { name: fuzz_parse_glob, should_pass: true }
           - { name: fuzz_parse_size, should_pass: true }
           - { name: fuzz_parse_time, should_pass: true }
+          - { name: fuzz_seq_parse_number, should_pass: true }
+
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly

fuzz/Cargo.toml

@@ -92,6 +92,12 @@ path = "fuzz_targets/fuzz_test.rs"
 test = false
 doc = false
 
+[[bin]]
+name = "fuzz_seq_parse_number"
+path = "fuzz_targets/fuzz_seq_parse_number.rs"
+test = false
+doc = false
+
 [[bin]]
 name = "fuzz_parse_glob"
 path = "fuzz_targets/fuzz_parse_glob.rs"

fuzz/fuzz_targets/fuzz_seq_parse_number.rs

@@ -0,0 +1,15 @@
+// This file is part of the uutils coreutils package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use std::str::FromStr;
+use uu_seq::number::PreciseNumber;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        let _ = PreciseNumber::from_str(s);
+    }
+});

src/uu/seq/src/seq.rs

@@ -14,6 +14,10 @@ use uucore::{format_usage, help_about, help_usage};
 
 mod error;
 mod extendedbigdecimal;
+// public to allow fuzzing
+#[cfg(fuzzing)]
+pub mod number;
+#[cfg(not(fuzzing))]
 mod number;
 mod numberparse;
 use crate::error::SeqError;