1 // Copyright 2021, The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #![allow(missing_docs)] 16 #![no_main] 17 18 use hashbrown::HashMap; 19 use libfuzzer_sys::arbitrary::Arbitrary; 20 use libfuzzer_sys::fuzz_target; 21 22 const MAX_RESERVE: usize = 1024; 23 24 #[derive(Arbitrary, Debug, Eq, Hash, PartialEq)] 25 enum Data { 26 A, 27 B, 28 Int { val: u8 }, 29 } 30 31 #[derive(Arbitrary, Debug)] 32 enum HashMapMethods { 33 Insert { key: Data, value: Data }, 34 Remove { key: Data }, 35 ContainsKey { key: Data }, 36 Get { key: Data }, 37 EntryOrInsert { key: Data, value: Data }, 38 Iter, 39 Drain, 40 Clear, 41 Reserve { additional: usize }, 42 ShrinkToFit, 43 ShrinkTo { min_capacity: usize }, 44 } 45 46 fuzz_target!(|commands: Vec<HashMapMethods>| { 47 let mut map = HashMap::new(); 48 for command in commands { 49 match command { 50 HashMapMethods::Insert { key, value } => { 51 map.insert(key, value); 52 } 53 HashMapMethods::Remove { key } => { 54 map.remove(&key); 55 } 56 HashMapMethods::ContainsKey { key } => { 57 map.contains_key(&key); 58 } 59 HashMapMethods::Get { key } => { 60 map.get(&key); 61 } 62 HashMapMethods::EntryOrInsert { key, value } => { 63 map.entry(key).or_insert(value); 64 } 65 HashMapMethods::Iter => { 66 std::hint::black_box(map.iter().count()); 67 } 68 HashMapMethods::Drain => { 69 std::hint::black_box(map.drain().count()); 70 } 71 HashMapMethods::Clear => { 72 map.clear(); 73 } 74 HashMapMethods::Reserve { additional } => { 75 // Avoid allocating too much memory and crashing the fuzzer. 76 map.reserve(additional % MAX_RESERVE); 77 } 78 HashMapMethods::ShrinkToFit => { 79 map.shrink_to_fit(); 80 } 81 HashMapMethods::ShrinkTo { min_capacity } => { 82 map.shrink_to(min_capacity % MAX_RESERVE); 83 } 84 } 85 } 86 }); 87