Fixed a memory corruption issue with JS memory operations that were r…

…eusing invalid views

examples/engine_cross_compilation.rs

@@ -69,10 +69,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // That's where we specify the target for the compiler.
     //
     // Use the Universal engine.
-    let mut engine = EngineBuilder::new(compiler_config).set_target(Some(target));
+    let engine = EngineBuilder::new(compiler_config).set_target(Some(target));
 
     // Create a store, that holds the engine.
-    let mut store = Store::new(engine);
+    let store = Store::new(engine);
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/engine_headless.rs

@@ -74,7 +74,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         let compiler = Cranelift::default();
 
         // Create a store, that holds the engine.
-        let mut store = Store::new(compiler);
+        let store = Store::new(compiler);
 
         println!("Compiling module...");
         // Let's compile the Wasm module.
@@ -96,7 +96,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         // We create a headless Universal engine.
         let engine = EngineBuilder::headless();
         let mut store = Store::new(engine);
-        let mut env = FunctionEnv::new(&mut store, ());
+        let _env = FunctionEnv::new(&mut store, ());
 
         println!("Deserializing module...");
         // Here we go.

examples/errors.rs

@@ -39,7 +39,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/exports_function.rs

@@ -40,7 +40,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/exports_global.rs

@@ -40,7 +40,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/exports_memory.rs

@@ -37,7 +37,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.
@@ -57,14 +57,15 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     //
     // The Wasm module exports a memory under "mem". Let's get it.
     let memory = instance.exports.get_memory("mem")?;
-
+    
     // Now that we have the exported memory, let's get some
     // information about it.
     //
     // The first thing we might be intersted in is the size of the memory.
     // Let's get it!
-    println!("Memory size (pages) {:?}", memory.size(&mut store));
-    println!("Memory size (bytes) {:?}", memory.data_size(&mut store));
+    let memory_view = memory.view(&store);
+    println!("Memory size (pages) {:?}", memory_view.size());
+    println!("Memory size (bytes) {:?}", memory_view.data_size());
 
     // Oh! Wait, before reading the contents, we need to know
     // where to find what we are looking for.
@@ -79,8 +80,9 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     //
     // We will get bytes out of the memory so we need to
     // decode them into a string.
+    let memory_view = memory.view(&store);
     let str = ptr
-        .read_utf8_string(&mut store, memory, length as u32)
+        .read_utf8_string(&memory_view, length as u32)
         .unwrap();
     println!("Memory contents: {:?}", str);
 
@@ -90,7 +92,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // To do that, we'll make a slice from our pointer and change the content
     // of each element.
     let new_str = b"Hello, Wasmer!";
-    let values = ptr.slice(&mut store, memory, new_str.len() as u32).unwrap();
+    let values = ptr.slice(&memory_view, new_str.len() as u32).unwrap();
     for i in 0..new_str.len() {
         values.index(i as u64).write(new_str[i]).unwrap();
     }
@@ -103,7 +105,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("New string length: {:?}", new_str.len());
 
     let str = ptr
-        .read_utf8_string(&mut store, memory, new_str.len() as u32)
+        .read_utf8_string(&memory_view, new_str.len() as u32)
         .unwrap();
     println!("New memory contents: {:?}", str);
 

examples/features.rs

@@ -41,7 +41,7 @@ fn main() -> anyhow::Result<()> {
 
     // Now, let's define the store, and compile the module.
     let mut store = Store::new(engine);
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
     let module = Module::new(&store, wasm_bytes)?;
 
     // Finally, let's instantiate the module, and execute something

examples/hello_world.rs

@@ -54,7 +54,7 @@ fn main() -> anyhow::Result<()> {
 
     // Next we'll set up our `Module` so that we can execute it. First, create
     // a `FunctionEnv` in which to instantiate our `Module`.
-    let mut context = FunctionEnv::new(&mut store, ());
+    let context = FunctionEnv::new(&mut store, ());
 
     // We define a function to act as our "env" "say_hello" function imported in the
     // Wasm program above.

examples/imports_exports.rs

@@ -44,7 +44,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/imports_function.rs

@@ -45,9 +45,9 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env1 = FunctionEnv::new(&mut store, ());
+    let env1 = FunctionEnv::new(&mut store, ());
     struct MyEnv;
-    let mut env2 = FunctionEnv::new(&mut store, MyEnv {});
+    let env2 = FunctionEnv::new(&mut store, MyEnv {});
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/imports_function_env.rs

@@ -87,7 +87,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         *counter_ref
     }
 
-    let mut env = FunctionEnv::new(
+    let env = FunctionEnv::new(
         &mut store,
         Env {
             counter: shared_counter.clone(),

examples/imports_global.rs

@@ -40,7 +40,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/instance.rs

@@ -39,7 +39,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/memory.rs

@@ -59,7 +59,7 @@ fn main() -> anyhow::Result<()> {
     // the default provided by Wasmer.
     // You can use `Store::default()` for that.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.
@@ -83,7 +83,7 @@ fn main() -> anyhow::Result<()> {
     let set_at: TypedFunction<(i32, i32), ()> =
         instance.exports.get_typed_function(&mut store, "set_at")?;
     let memory = instance.exports.get_memory("memory")?;
-
+    
     // We now have an instance ready to be used.
     //
     // We will start by querying the most intersting information
@@ -95,27 +95,33 @@ fn main() -> anyhow::Result<()> {
     // The size in bytes can be found either by querying its pages or by
     // querying the memory directly.
     println!("Querying memory size...");
-    assert_eq!(memory.size(&mut store), Pages::from(1));
-    assert_eq!(memory.size(&mut store).bytes(), Bytes::from(65536 as usize));
-    assert_eq!(memory.data_size(&mut store), 65536);
-
+    let memory_view = memory.view(&store);
+    assert_eq!(memory_view.size(), Pages::from(1));
+    assert_eq!(memory_view.size().bytes(), Bytes::from(65536 as usize));
+    assert_eq!(memory_view.data_size(), 65536);
+
     // Sometimes, the guest module may also export a function to let you
     // query the memory. Here we have a `mem_size` function, let's try it:
     let result = mem_size.call(&mut store)?;
+
+    let memory_view = memory.view(&store);
     println!("Memory size: {:?}", result);
-    assert_eq!(Pages::from(result as u32), memory.size(&mut store));
+    assert_eq!(Pages::from(result as u32), memory_view.size());
 
     // Now that we know the size of our memory, it's time to see how wa
     // can change this.
     //
     // A memory can be grown to allow storing more things into it. Let's
     // see how we can do that:
     println!("Growing memory...");
+
     // Here we are requesting two more pages for our memory.
     memory.grow(&mut store, 2)?;
-    assert_eq!(memory.size(&mut store), Pages::from(3));
-    assert_eq!(memory.data_size(&mut store), 65536 * 3);
-
+
+    let memory_view = memory.view(&store);
+    assert_eq!(memory_view.size(), Pages::from(3));
+    assert_eq!(memory_view.data_size(), 65536 * 3);
+
     // Now that we know how to query and adjust the size of the memory,
     // let's see how wa can write to it or read from it.
     //

examples/metering.rs

@@ -72,7 +72,7 @@ fn main() -> anyhow::Result<()> {
     // We use our previously create compiler configuration
     // with the Universal engine.
     let mut store = Store::new(EngineBuilder::new(compiler_config));
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     // Let's compile the Wasm module.

examples/platform_ios_headless.rs

@@ -11,7 +11,7 @@
 //! ```
 //!
 //! Ready?
-
+#![allow(unused)]
 use std::path::Path;
 use std::str::FromStr;
 use wasmer::{wat2wasm, Module, RuntimeError, Store};

examples/table.rs

@@ -52,7 +52,7 @@ fn main() -> anyhow::Result<()> {
 
     // We set up our store with an engine and a compiler.
     let mut store = Store::new(Cranelift::default());
-    let mut env = FunctionEnv::new(&mut store, ());
+    let env = FunctionEnv::new(&mut store, ());
     // Then compile our Wasm.
     let module = Module::new(&store, wasm_bytes)?;
     let import_object = imports! {};

examples/tunables_limit_memory.rs

@@ -143,7 +143,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     // Create a store, that holds the engine and our custom tunables
     let mut store = Store::new_with_tunables(compiler, tunables);
-    let mut env = FunctionEnv::new(&mut store, ());
+    let _env = FunctionEnv::new(&mut store, ());
 
     println!("Compiling module...");
     let module = Module::new(&store, wasm_bytes)?;

examples/wasi.rs

@@ -15,7 +15,7 @@
 //!
 //! Ready?
 
-use wasmer::{FunctionEnv, Instance, Module, Store};
+use wasmer::{Instance, Module, Store};
 use wasmer_compiler_cranelift::Cranelift;
 use wasmer_wasi::WasiState;
 
@@ -39,7 +39,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     println!("Creating `WasiEnv`...");
     // First, we create the `WasiEnv`
-    let mut wasi_env = WasiState::new("hello")
+    let wasi_env = WasiState::new("hello")
         // .args(&["world"])
         // .env("KEY", "Value")
         .finalize(&mut store)?;

examples/wasi_pipes.rs

@@ -12,7 +12,7 @@
 //! Ready?
 
 use std::io::{Read, Write};
-use wasmer::{FunctionEnv, Instance, Module, Store};
+use wasmer::{Instance, Module, Store};
 use wasmer_compiler_cranelift::Cranelift;
 use wasmer_wasi::{Pipe, WasiState};
 
@@ -38,7 +38,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // First, we create the `WasiEnv` with the stdio pipes
     let mut input = Pipe::new();
     let mut output = Pipe::new();
-    let mut wasi_env = WasiState::new("hello")
+    let wasi_env = WasiState::new("hello")
         .stdin(Box::new(input.clone()))
         .stdout(Box::new(output.clone()))
         .finalize(&mut store)?;

fuzz/fuzz_targets/universal_cranelift.rs

@@ -43,7 +43,7 @@ fuzz_target!(|module: WasmSmithModule| {
     compiler.enable_verifier();
     let mut store = Store::new(compiler);
     let module = Module::new(&store, &wasm_bytes).unwrap();
-    match Instance::new(&module, &imports! {}) {
+    match Instance::new(&mut store, &module, &imports! {}) {
         Ok(_) => {}
         Err(e) => {
             let error_message = format!("{}", e);

lib/api/Cargo.toml

@@ -26,6 +26,7 @@ indexmap = { version = "1.6", features = ["serde-1"] }
 cfg-if = "1.0"
 thiserror = "1.0"
 more-asserts = "0.2"
+tracing = "0.1"
 # - Optional shared dependencies.
 wat = { version = "1.0", optional = true }
 

lib/api/src/js/externals/function.rs

@@ -115,7 +115,7 @@ impl Function {
         let wrapped_func: JsValue = match function_type.results().len() {
             0 => Closure::wrap(Box::new(move |args: &Array| {
                 let mut store: StoreMut = unsafe { StoreMut::from_raw(raw_store as _) };
-                let mut env: FunctionEnvMut<T> = raw_env.clone().into_mut(&mut store);
+                let env: FunctionEnvMut<T> = raw_env.clone().into_mut(&mut store);
                 let wasm_arguments = function_type
                     .params()
                     .iter()
@@ -129,7 +129,7 @@ impl Function {
             .into_js_value(),
             1 => Closure::wrap(Box::new(move |args: &Array| {
                 let mut store: StoreMut = unsafe { StoreMut::from_raw(raw_store as _) };
-                let mut env: FunctionEnvMut<T> = raw_env.clone().into_mut(&mut store);
+                let env: FunctionEnvMut<T> = raw_env.clone().into_mut(&mut store);
                 let wasm_arguments = function_type
                     .params()
                     .iter()
@@ -143,7 +143,7 @@ impl Function {
             .into_js_value(),
             _n => Closure::wrap(Box::new(move |args: &Array| {
                 let mut store: StoreMut = unsafe { StoreMut::from_raw(raw_store as _) };
-                let mut env: FunctionEnvMut<T> = raw_env.clone().into_mut(&mut store);
+                let env: FunctionEnvMut<T> = raw_env.clone().into_mut(&mut store);
                 let wasm_arguments = function_type
                     .params()
                     .iter()
@@ -509,7 +509,7 @@ mod inner {
     use super::RuntimeError;
     use super::VMFunctionBody;
     use crate::js::function_env::{FunctionEnvMut, VMFunctionEnvironment};
-    use crate::js::store::{AsStoreMut, InternalStoreHandle, StoreHandle, StoreInner, StoreMut};
+    use crate::js::store::{AsStoreMut, InternalStoreHandle, StoreHandle, StoreMut};
     use crate::js::FunctionEnv;
     use crate::js::NativeWasmTypeInto;
     use std::array::TryFromSliceError;