Signed WDM driver embedding wasm3. Loads unsigned .wasm modules, gives them nt/hal FFI. Write kernel logic in C/Rust, compile to wasm32, load, iterate. HVCI-compliant.

Features

wasm3 in the kernel, 64KB expanded stack, no JIT
Direct FFI to any nt/hal export by name
Per-module capability manifest
Per-slot KMUTEX, per-slot pool budget
SEH-guarded kernel VA read/write
InfinityHook trampoline
Process/image notify callbacks
Watchdog + trace/log rings
Qt6 GUI

Build

Needs VS 2022 + WDK 10.0.26100.0, Qt 6.9, clang wasm32.

build.cmd Release

Install

cd deploy
gen_cert.cmd
install.cmd

Needs bcdedit /set testsigning on if not signed.

IOCTLs

Code	Purpose
`LOAD_MODULE`	load .wasm, link imports
`CALL_EXPORT`	invoke export, up to 8 args
`UNLOAD_MODULE`	tear down runtime
`LIST_MODULES` / `MODULE_INFO`	enumerate
`UNLOAD_ALL` / `FORCE_UNLOAD`	bulk teardown
`TAIL_LOG` / `TAIL_TRACE`	poll rings
`TRACE_CTL`	toggle trace
`READ_GUEST`	read guest linear memory
`NOTIFY_STOP`	deregister callbacks

Host Imports

Import	Sig
`host_dbg_print`	`v(ii)`
`host_alloc` / `host_free`	`I(i)` / `v(I)`
`host_read_u8/32/64`	`i/I(I)`
`host_write_u64`	`v(II)`
`host_read_bytes` / `host_write_bytes`	`i(Iii)`
`host_current_irql`	`i()`
`host_process_id` / `host_thread_id`	`i()`
`host_current_process`	`I()`
`host_cpuid`	`v(iii)`
`host_rdtsc`	`I()`
`host_readmsr` / `host_writemsr`	`I(i)` / `i(iI)`
`host_phys_read` / `host_phys_write`	`i(Iii)`
`host_call`	`I(iiiIIIIIIII)`
`host_ih_trampoline` / `host_ih_configure` / `host_ih_quiesce`
`host_notify_enable` / `host_notify_poll` / `host_dispatch_start` / `host_dispatch_stop`
`host_mem_base` / `host_mem_size`	`I()` / `i()`
`host_make_unistr` / `host_free_unistr`

Guest bindings in guest_sdk/gvm.h.

Capabilities

Bit	Name	Grants
0	`ALLOC`	host_alloc, host_free
1	`READ_KMEM`	host_read_*
2	`WRITE_KMEM`	host_write_*
3	`MSR_READ`	host_readmsr
4	`MSR_WRITE`	host_writemsr
5	`PHYSMEM`	host_phys_*
6	`CPUID_TSC`	host_cpuid, host_rdtsc
7	`CALLBACKS`	process/image notify
8	`HOSTCALL`	host_call
9	`INTROSPECT`	pid/tid/irql/current_process

Limits

no f32/f64 in guests
wasm memory bounds checks compiled out
one caller per module
16MB ioctl payload
32 module slots

Credits

wasm3 by Volodymyr Shymanskyy and Steven Massey (MIT). https://github.com/wasm3/wasm3
InfinityHook by everdox (MIT). https://github.com/everdox/InfinityHook
Qt 6 (LGPL v3)

License

MIT.