Thanks for filing a bug report! Please fill out the TODOs below.
Note: if you want to report a security issue, please read our security policy!
Test Case
Here's the WASM code required to reproduce this bug:
fn main() {
let dir = std::fs::read_dir("/").unwrap();
println!("{:?}", dir.collect::<Vec<_>>());
}cargo build --target wasm32-wasi --release
Compiled in release mode with debug = true:
test.wasm.tgz
Here's the Rust host code required, modified from the WASI example:
use wasmtime::*;
use wasmtime_wasi::{ambient_authority, sync::WasiCtxBuilder, Dir};
fn main() -> Result<()> {
// Define the WASI functions globally on the `Config`.
let engine = Engine::default();
let mut linker = Linker::new(&engine);
wasmtime_wasi::add_to_linker(&mut linker, |s| s)?;
let wasm_fs = Dir::open_ambient_dir("/", ambient_authority())
.expect("Filesystem root should be accessible");
// Create a WASI context and put it in a Store; all instances in the store
// share this context. `WasiCtxBuilder` provides a number of ways to
// configure what the target program will have access to.
let wasi = WasiCtxBuilder::new()
.preopened_dir(wasm_fs, "/")
.unwrap()
.inherit_stdio()
.inherit_args()?
.build();
let mut store = Store::new(&engine, wasi);
// Instantiate our module with the imports we've created, and run it.
let module = Module::from_file(&engine, "./test.wasm")?;
linker.module(&mut store, "", &module)?;
// --> Panic occurs here
linker
.get_default(&mut store, "")?
.typed::<(), ()>(&store)?
.call(&mut store, ())?;
Ok(())
}Steps to Reproduce
- Use
wasmtime_wasi::Dir to allow access to the root directory
- Attempt to read the root directory from WASM
Expected Results
The program will print the files in the root directory: bin, dev, usr, etc.
Actual Results
Program panics:
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: TryFromIntError(())', <...>/cap-primitives-2.0.0/src/rustix/fs/metadata_ext.rs:167:49
Versions and Environment
Wasmtime version or commit: v12.0.1
Operating system: macOS Ventura 13.5.1
Architecture: arm64 Apple Silicon
Extra Info
I'm not familiar with ambient authority.
Thanks for filing a bug report! Please fill out the TODOs below.
Note: if you want to report a security issue, please read our security policy!
Test Case
Here's the WASM code required to reproduce this bug:
Compiled in release mode with
debug = true:test.wasm.tgz
Here's the Rust host code required, modified from the WASI example:
Steps to Reproduce
wasmtime_wasi::Dirto allow access to the root directoryExpected Results
The program will print the files in the root directory:
bin,dev,usr, etc.Actual Results
Program panics:
Versions and Environment
Wasmtime version or commit: v12.0.1
Operating system: macOS Ventura 13.5.1
Architecture: arm64 Apple Silicon
Extra Info
I'm not familiar with ambient authority.