quick'n'dirty fuzz target for Rust str::repeat()

str-repeat-fuzz.rs

extern crate rand;
extern crate quickcheck;

use std::io::prelude::*;
use quickcheck::{Arbitrary};

// suppress ASAN false positives
const ASAN_DEFAULT_OPTIONS: &'static [u8] = b"allocator_may_return_null=1,detect_odr_violation=1\0";
#[no_mangle]
pub extern "C" fn __asan_default_options() -> *const u8 {
    ASAN_DEFAULT_OPTIONS as *const [u8] as *const u8
}

fn main() -> std::result::Result<(), std::io::Error> {
    // read fuzzer input from stdin
    let mut raw_input = vec![];
    std::io::stdin().read_to_end(&mut raw_input)?;

    // input preparation for QuickCheck, not specific to the fuzzed function
    let input_cursor = std::io::Cursor::new(raw_input);
    let read_rng = rand::rngs::adapter::ReadRng::new(input_cursor);
    let mut read_rng = quickcheck::StdGen::new(read_rng, std::usize::MAX);

    // create input data for specific function from random bytes
    let fuzz_self = std::string::String::arbitrary(&mut read_rng);
    let fuzz_argument_1 = usize::arbitrary(&mut read_rng);

    // invoke function
    fuzz_self.repeat(fuzz_argument_1);

    Ok(())
}

This file is dual-licensed under MIT and Apache 2.0