83 lines
2.0 KiB
Rust
83 lines
2.0 KiB
Rust
#![no_main]
|
|
|
|
use {
|
|
hbvm::{
|
|
mem::{
|
|
softpaging::{
|
|
paging::{PageTable, Permission},
|
|
HandlePageFault, PageSize, SoftPagedMem,
|
|
},
|
|
Address, MemoryAccessReason,
|
|
},
|
|
Vm,
|
|
},
|
|
libfuzzer_sys::fuzz_target,
|
|
};
|
|
|
|
fuzz_target!(|data: &[u8]| {
|
|
let mut vm = unsafe {
|
|
Vm::<_, 16384>::new(
|
|
SoftPagedMem::<_, true> {
|
|
pf_handler: TestTrapHandler,
|
|
program: data,
|
|
root_pt: Box::into_raw(Default::default()),
|
|
icache: Default::default(),
|
|
},
|
|
Address::new(4),
|
|
)
|
|
};
|
|
|
|
// Alloc and map some memory
|
|
let pages = [
|
|
alloc_and_map(&mut vm.memory, 0),
|
|
alloc_and_map(&mut vm.memory, 4096),
|
|
];
|
|
|
|
// Run VM
|
|
let _ = vm.run();
|
|
|
|
// Unmap and dealloc the memory
|
|
for (i, page) in pages.into_iter().enumerate() {
|
|
unmap_and_dealloc(&mut vm.memory, page, i as u64 * 4096);
|
|
}
|
|
|
|
let _ = unsafe { Box::from_raw(vm.memory.root_pt) };
|
|
});
|
|
|
|
fn alloc_and_map(memory: &mut SoftPagedMem<TestTrapHandler>, at: u64) -> *mut u8 {
|
|
let ptr = Box::into_raw(Box::<Page>::default()).cast();
|
|
unsafe {
|
|
memory
|
|
.map(ptr, Address::new(at), Permission::Write, PageSize::Size4K)
|
|
.unwrap()
|
|
};
|
|
ptr
|
|
}
|
|
|
|
fn unmap_and_dealloc(memory: &mut SoftPagedMem<TestTrapHandler>, ptr: *mut u8, from: u64) {
|
|
memory.unmap(Address::new(from)).unwrap();
|
|
let _ = unsafe { Box::from_raw(ptr.cast::<Page>()) };
|
|
}
|
|
|
|
#[repr(align(4096))]
|
|
struct Page([u8; 4096]);
|
|
impl Default for Page {
|
|
fn default() -> Self {
|
|
unsafe { std::mem::MaybeUninit::zeroed().assume_init() }
|
|
}
|
|
}
|
|
|
|
struct TestTrapHandler;
|
|
impl HandlePageFault for TestTrapHandler {
|
|
fn page_fault(
|
|
&mut self,
|
|
_: MemoryAccessReason,
|
|
_: &mut PageTable,
|
|
_: Address,
|
|
_: PageSize,
|
|
_: *mut u8,
|
|
) -> bool {
|
|
false
|
|
}
|
|
}
|