forked from AbleOS/holey-bytes
Added fuzzer back
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parent
633e3adc61
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5
hbvm/fuzz/.gitignore
vendored
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5
hbvm/fuzz/.gitignore
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target
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artifacts
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corpus
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coverage
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Cargo.lock
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30
hbvm/fuzz/Cargo.toml
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30
hbvm/fuzz/Cargo.toml
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[package]
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name = "hbvm-fuzz"
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version = "0.0.0"
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publish = false
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edition = "2021"
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[package.metadata]
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cargo-fuzz = true
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[dependencies]
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libfuzzer-sys = "0.4"
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[dependencies.hbvm]
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path = ".."
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[dependencies.hbbytecode]
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path = "../../hbbytecode"
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# Prevent this from interfering with workspaces
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[workspace]
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members = ["."]
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[profile.release]
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debug = 1
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[[bin]]
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name = "vm"
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path = "fuzz_targets/vm.rs"
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test = false
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doc = false
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82
hbvm/fuzz/fuzz_targets/vm.rs
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82
hbvm/fuzz/fuzz_targets/vm.rs
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#![no_main]
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use {
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hbvm::{
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mem::{
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softpaging::{
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paging::{PageTable, Permission},
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HandlePageFault, PageSize, SoftPagedMem,
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},
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Address, MemoryAccessReason,
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},
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Vm,
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},
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libfuzzer_sys::fuzz_target,
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};
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fuzz_target!(|data: &[u8]| {
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let mut vm = unsafe {
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Vm::<_, 16384>::new(
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SoftPagedMem::<_, true> {
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pf_handler: TestTrapHandler,
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program: data,
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root_pt: Box::into_raw(Default::default()),
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icache: Default::default(),
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},
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Address::new(4),
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)
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};
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// Alloc and map some memory
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let pages = [
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alloc_and_map(&mut vm.memory, 0),
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alloc_and_map(&mut vm.memory, 4096),
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];
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// Run VM
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let _ = vm.run();
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// Unmap and dealloc the memory
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for (i, page) in pages.into_iter().enumerate() {
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unmap_and_dealloc(&mut vm.memory, page, i as u64 * 4096);
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}
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let _ = unsafe { Box::from_raw(vm.memory.root_pt) };
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});
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fn alloc_and_map(memory: &mut SoftPagedMem<TestTrapHandler>, at: u64) -> *mut u8 {
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let ptr = Box::into_raw(Box::<Page>::default()).cast();
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unsafe {
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memory
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.map(ptr, Address::new(at), Permission::Write, PageSize::Size4K)
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.unwrap()
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};
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ptr
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}
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fn unmap_and_dealloc(memory: &mut SoftPagedMem<TestTrapHandler>, ptr: *mut u8, from: u64) {
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memory.unmap(Address::new(from)).unwrap();
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let _ = unsafe { Box::from_raw(ptr.cast::<Page>()) };
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}
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#[repr(align(4096))]
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struct Page([u8; 4096]);
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impl Default for Page {
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fn default() -> Self {
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unsafe { std::mem::MaybeUninit::zeroed().assume_init() }
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}
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}
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struct TestTrapHandler;
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impl HandlePageFault for TestTrapHandler {
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fn page_fault(
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&mut self,
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_: MemoryAccessReason,
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_: &mut PageTable,
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_: Address,
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_: PageSize,
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_: *mut u8,
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) -> bool {
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false
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}
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}
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