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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#![allow(missing_docs)]
#![no_main]
mod read_utils;
use crate::read_utils::READ_FUNCS;
use binder::binder_impl::{
Binder, BorrowedParcel, IBinderInternal, Parcel, Stability, TransactionCode,
};
use binder::{
declare_binder_interface, BinderFeatures, Interface, Parcelable, ParcelableHolder, SpIBinder,
StatusCode,
};
use binder_random_parcel_rs::create_random_parcel;
use libfuzzer_sys::{arbitrary::Arbitrary, fuzz_target};
#[derive(Arbitrary, Debug)]
enum ReadOperation {
SetDataPosition { pos: i32 },
GetDataSize,
ReadParcelableHolder { is_vintf: bool },
ReadBasicTypes { instructions: Vec<usize> },
}
#[derive(Arbitrary, Debug)]
enum Operation<'a> {
Transact { code: u32, flag: u32, data: &'a [u8] },
Append { start: i32, len: i32, data1: &'a [u8], data2: &'a [u8], append_all: bool },
Read { read_operations: Vec<ReadOperation>, data: &'a [u8] },
}
/// Interface to fuzz transact with random parcel
pub trait BinderTransactTest: Interface {}
declare_binder_interface! {
BinderTransactTest["Binder_Transact_Test"] {
native: BnBinderTransactTest(on_transact),
proxy: BpBinderTransactTest,
}
}
impl BinderTransactTest for Binder<BnBinderTransactTest> {}
impl BinderTransactTest for BpBinderTransactTest {}
impl BinderTransactTest for () {}
fn on_transact(
_service: &dyn BinderTransactTest,
_code: TransactionCode,
_parcel: &BorrowedParcel<'_>,
_reply: &mut BorrowedParcel<'_>,
) -> Result<(), StatusCode> {
Err(StatusCode::UNKNOWN_ERROR)
}
fn do_transact(code: u32, data: &[u8], flag: u32) {
let p: Parcel = create_random_parcel(data);
let spibinder: Option<SpIBinder> =
Some(BnBinderTransactTest::new_binder((), BinderFeatures::default()).as_binder());
let _reply = spibinder.submit_transact(code, p, flag);
}
fn do_append_fuzz(start: i32, len: i32, data1: &[u8], data2: &[u8], append_all: bool) {
let mut p1 = create_random_parcel(data1);
let p2 = create_random_parcel(data2);
// Fuzz both append methods
if append_all {
match p1.append_all_from(&p2) {
Ok(result) => result,
Err(e) => {
println!("Error occurred while appending a parcel using append_all_from: {:?}", e)
}
}
} else {
match p1.append_from(&p2, start, len) {
Ok(result) => result,
Err(e) => {
println!("Error occurred while appending a parcel using append_from: {:?}", e)
}
}
};
}
fn do_read_fuzz(read_operations: Vec<ReadOperation>, data: &[u8]) {
let parcel = create_random_parcel(data);
for operation in read_operations {
match operation {
ReadOperation::SetDataPosition { pos } => {
// Safety: Safe if pos is less than current size of the parcel.
// It relies on C++ code for bound checks
unsafe {
match parcel.set_data_position(pos) {
Ok(result) => result,
Err(e) => println!("error occurred while setting data position: {:?}", e),
}
}
}
ReadOperation::GetDataSize => {
let data_size = parcel.get_data_size();
println!("data size from parcel: {:?}", data_size);
}
ReadOperation::ReadParcelableHolder { is_vintf } => {
let stability = if is_vintf { Stability::Vintf } else { Stability::Local };
let mut holder: ParcelableHolder = ParcelableHolder::new(stability);
match holder.read_from_parcel(parcel.borrowed_ref()) {
Ok(result) => result,
Err(err) => {
println!("error occurred while reading from parcel: {:?}", err)
}
}
}
ReadOperation::ReadBasicTypes { instructions } => {
for instruction in instructions.iter() {
let read_index = instruction % READ_FUNCS.len();
READ_FUNCS[read_index](parcel.borrowed_ref());
}
}
}
}
}
fuzz_target!(|operation: Operation| {
match operation {
Operation::Transact { code, flag, data } => {
do_transact(code, data, flag);
}
Operation::Append { start, len, data1, data2, append_all } => {
do_append_fuzz(start, len, data1, data2, append_all);
}
Operation::Read { read_operations, data } => {
do_read_fuzz(read_operations, data);
}
}
});
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