457 lines
16 KiB
Rust
457 lines
16 KiB
Rust
#[allow(unused_imports)]
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use alloc::prelude::*;
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use core::fmt;
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#[cfg(feature = "std")]
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use std::error;
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#[cfg(not(feature = "std"))]
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use hashmap_core::HashSet;
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#[cfg(feature = "std")]
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use std::collections::HashSet;
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use self::context::ModuleContextBuilder;
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use self::func::FunctionReader;
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use common::stack;
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use isa;
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use memory_units::Pages;
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use parity_wasm::elements::{
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BlockType, External, GlobalEntry, GlobalType, InitExpr, Instruction, Internal, MemoryType,
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Module, ResizableLimits, TableType, Type, ValueType,
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};
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mod context;
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mod func;
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mod util;
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#[cfg(test)]
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mod tests;
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#[derive(Debug)]
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pub struct Error(String);
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.0)
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}
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}
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#[cfg(feature = "std")]
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impl error::Error for Error {
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fn description(&self) -> &str {
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&self.0
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}
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}
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impl From<stack::Error> for Error {
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fn from(e: stack::Error) -> Error {
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Error(format!("Stack: {}", e))
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}
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}
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#[derive(Clone)]
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pub struct ValidatedModule {
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pub code_map: Vec<isa::Instructions>,
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pub module: Module,
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}
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impl ::core::ops::Deref for ValidatedModule {
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type Target = Module;
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fn deref(&self) -> &Module {
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&self.module
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}
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}
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pub fn deny_floating_point(module: &Module) -> Result<(), Error> {
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if let Some(code) = module.code_section() {
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for op in code.bodies().iter().flat_map(|body| body.code().elements()) {
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use parity_wasm::elements::Instruction::*;
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macro_rules! match_eq {
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($pattern:pat) => {
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|val| if let $pattern = *val { true } else { false }
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};
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}
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const DENIED: &[fn(&Instruction) -> bool] = &[
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match_eq!(F32Load(_, _)),
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match_eq!(F64Load(_, _)),
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match_eq!(F32Store(_, _)),
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match_eq!(F64Store(_, _)),
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match_eq!(F32Const(_)),
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match_eq!(F64Const(_)),
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match_eq!(F32Eq),
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match_eq!(F32Ne),
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match_eq!(F32Lt),
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match_eq!(F32Gt),
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match_eq!(F32Le),
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match_eq!(F32Ge),
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match_eq!(F64Eq),
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match_eq!(F64Ne),
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match_eq!(F64Lt),
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match_eq!(F64Gt),
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match_eq!(F64Le),
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match_eq!(F64Ge),
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match_eq!(F32Abs),
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match_eq!(F32Neg),
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match_eq!(F32Ceil),
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match_eq!(F32Floor),
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match_eq!(F32Trunc),
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match_eq!(F32Nearest),
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match_eq!(F32Sqrt),
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match_eq!(F32Add),
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match_eq!(F32Sub),
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match_eq!(F32Mul),
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match_eq!(F32Div),
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match_eq!(F32Min),
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match_eq!(F32Max),
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match_eq!(F32Copysign),
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match_eq!(F64Abs),
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match_eq!(F64Neg),
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match_eq!(F64Ceil),
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match_eq!(F64Floor),
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match_eq!(F64Trunc),
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match_eq!(F64Nearest),
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match_eq!(F64Sqrt),
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match_eq!(F64Add),
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match_eq!(F64Sub),
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match_eq!(F64Mul),
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match_eq!(F64Div),
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match_eq!(F64Min),
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match_eq!(F64Max),
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match_eq!(F64Copysign),
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match_eq!(F32ConvertSI32),
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match_eq!(F32ConvertUI32),
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match_eq!(F32ConvertSI64),
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match_eq!(F32ConvertUI64),
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match_eq!(F32DemoteF64),
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match_eq!(F64ConvertSI32),
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match_eq!(F64ConvertUI32),
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match_eq!(F64ConvertSI64),
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match_eq!(F64ConvertUI64),
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match_eq!(F64PromoteF32),
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match_eq!(F32ReinterpretI32),
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match_eq!(F64ReinterpretI64),
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match_eq!(I32TruncSF32),
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match_eq!(I32TruncUF32),
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match_eq!(I32TruncSF64),
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match_eq!(I32TruncUF64),
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match_eq!(I64TruncSF32),
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match_eq!(I64TruncUF32),
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match_eq!(I64TruncSF64),
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match_eq!(I64TruncUF64),
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match_eq!(I32ReinterpretF32),
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match_eq!(I64ReinterpretF64),
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];
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if DENIED.iter().any(|is_denied| is_denied(op)) {
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return Err(Error(format!("Floating point operation denied: {:?}", op)));
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}
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}
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}
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if let (Some(sec), Some(types)) = (module.function_section(), module.type_section()) {
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use parity_wasm::elements::{Type, ValueType};
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let types = types.types();
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for sig in sec.entries() {
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if let Some(typ) = types.get(sig.type_ref() as usize) {
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match *typ {
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Type::Function(ref func) => {
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if func
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.params()
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.iter()
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.chain(func.return_type().as_ref())
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.any(|&typ| typ == ValueType::F32 || typ == ValueType::F64)
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{
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return Err(Error(format!("Use of floating point types denied")));
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}
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}
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}
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}
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}
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}
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Ok(())
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}
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pub fn validate_module(module: Module) -> Result<ValidatedModule, Error> {
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let mut context_builder = ModuleContextBuilder::new();
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let mut imported_globals = Vec::new();
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let mut code_map = Vec::new();
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// Copy types from module as is.
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context_builder.set_types(
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module
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.type_section()
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.map(|ts| {
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ts.types()
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.into_iter()
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.map(|&Type::Function(ref ty)| ty)
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.cloned()
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.collect()
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})
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.unwrap_or_default(),
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);
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// Fill elements with imported values.
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for import_entry in module
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.import_section()
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.map(|i| i.entries())
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.unwrap_or_default()
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{
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match *import_entry.external() {
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External::Function(idx) => context_builder.push_func_type_index(idx),
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External::Table(ref table) => context_builder.push_table(table.clone()),
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External::Memory(ref memory) => context_builder.push_memory(memory.clone()),
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External::Global(ref global) => {
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context_builder.push_global(global.clone());
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imported_globals.push(global.clone());
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}
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}
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}
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// Concatenate elements with defined in the module.
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if let Some(function_section) = module.function_section() {
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for func_entry in function_section.entries() {
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context_builder.push_func_type_index(func_entry.type_ref())
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}
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}
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if let Some(table_section) = module.table_section() {
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for table_entry in table_section.entries() {
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validate_table_type(table_entry)?;
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context_builder.push_table(table_entry.clone());
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}
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}
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if let Some(mem_section) = module.memory_section() {
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for mem_entry in mem_section.entries() {
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validate_memory_type(mem_entry)?;
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context_builder.push_memory(mem_entry.clone());
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}
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}
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if let Some(global_section) = module.global_section() {
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for global_entry in global_section.entries() {
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validate_global_entry(global_entry, &imported_globals)?;
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context_builder.push_global(global_entry.global_type().clone());
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}
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}
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let context = context_builder.build();
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let function_section_len = module
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.function_section()
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.map(|s| s.entries().len())
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.unwrap_or(0);
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let code_section_len = module.code_section().map(|s| s.bodies().len()).unwrap_or(0);
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if function_section_len != code_section_len {
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return Err(Error(format!(
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"length of function section is {}, while len of code section is {}",
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function_section_len, code_section_len
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)));
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}
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// validate every function body in user modules
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if function_section_len != 0 {
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// tests use invalid code
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let function_section = module
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.function_section()
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.expect("function_section_len != 0; qed");
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let code_section = module
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.code_section()
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.expect("function_section_len != 0; function_section_len == code_section_len; qed");
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// check every function body
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for (index, function) in function_section.entries().iter().enumerate() {
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let function_body = code_section
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.bodies()
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.get(index as usize)
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.ok_or(Error(format!("Missing body for function {}", index)))?;
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let code =
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FunctionReader::read_function(&context, function, function_body).map_err(|e| {
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let Error(ref msg) = e;
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Error(format!(
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"Function #{} reading/validation error: {}",
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index, msg
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))
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})?;
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code_map.push(code);
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}
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}
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// validate start section
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if let Some(start_fn_idx) = module.start_section() {
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let (params, return_ty) = context.require_function(start_fn_idx)?;
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if return_ty != BlockType::NoResult || params.len() != 0 {
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return Err(Error(
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"start function expected to have type [] -> []".into(),
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));
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}
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}
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// validate export section
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if let Some(export_section) = module.export_section() {
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let mut export_names = HashSet::with_capacity(export_section.entries().len());
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for export in export_section.entries() {
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// HashSet::insert returns false if item already in set.
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let duplicate = export_names.insert(export.field()) == false;
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if duplicate {
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return Err(Error(format!("duplicate export {}", export.field())));
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}
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match *export.internal() {
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Internal::Function(function_index) => {
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context.require_function(function_index)?;
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}
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Internal::Global(global_index) => {
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context.require_global(global_index, Some(false))?;
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}
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Internal::Memory(memory_index) => {
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context.require_memory(memory_index)?;
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}
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Internal::Table(table_index) => {
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context.require_table(table_index)?;
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}
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}
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}
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}
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// validate import section
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if let Some(import_section) = module.import_section() {
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for import in import_section.entries() {
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match *import.external() {
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External::Function(function_type_index) => {
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context.require_function_type(function_type_index)?;
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}
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External::Global(ref global_type) => {
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if global_type.is_mutable() {
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return Err(Error(format!(
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"trying to import mutable global {}",
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import.field()
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)));
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}
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}
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External::Memory(ref memory_type) => {
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validate_memory_type(memory_type)?;
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}
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External::Table(ref table_type) => {
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validate_table_type(table_type)?;
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}
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}
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}
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}
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// there must be no greater than 1 table in tables index space
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if context.tables().len() > 1 {
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return Err(Error(format!(
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"too many tables in index space: {}",
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context.tables().len()
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)));
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}
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// there must be no greater than 1 linear memory in memory index space
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if context.memories().len() > 1 {
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return Err(Error(format!(
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"too many memory regions in index space: {}",
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context.memories().len()
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)));
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}
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// use data section to initialize linear memory regions
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if let Some(data_section) = module.data_section() {
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for data_segment in data_section.entries() {
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context.require_memory(data_segment.index())?;
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let init_ty = expr_const_type(data_segment.offset(), context.globals())?;
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if init_ty != ValueType::I32 {
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return Err(Error("segment offset should return I32".into()));
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}
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}
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}
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// use element section to fill tables
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if let Some(element_section) = module.elements_section() {
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for element_segment in element_section.entries() {
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context.require_table(element_segment.index())?;
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let init_ty = expr_const_type(element_segment.offset(), context.globals())?;
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if init_ty != ValueType::I32 {
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return Err(Error("segment offset should return I32".into()));
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}
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for function_index in element_segment.members() {
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context.require_function(*function_index)?;
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}
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}
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}
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Ok(ValidatedModule { module, code_map })
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}
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fn validate_limits(limits: &ResizableLimits) -> Result<(), Error> {
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if let Some(maximum) = limits.maximum() {
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if limits.initial() > maximum {
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return Err(Error(format!(
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"maximum limit {} is less than minimum {}",
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maximum,
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limits.initial()
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)));
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}
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}
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Ok(())
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}
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fn validate_memory_type(memory_type: &MemoryType) -> Result<(), Error> {
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let initial: Pages = Pages(memory_type.limits().initial() as usize);
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let maximum: Option<Pages> = memory_type.limits().maximum().map(|m| Pages(m as usize));
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::memory::validate_memory(initial, maximum).map_err(Error)
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}
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fn validate_table_type(table_type: &TableType) -> Result<(), Error> {
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validate_limits(table_type.limits())
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}
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fn validate_global_entry(global_entry: &GlobalEntry, globals: &[GlobalType]) -> Result<(), Error> {
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let init = global_entry.init_expr();
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let init_expr_ty = expr_const_type(init, globals)?;
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if init_expr_ty != global_entry.global_type().content_type() {
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return Err(Error(format!(
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"Trying to initialize variable of type {:?} with value of type {:?}",
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global_entry.global_type().content_type(),
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init_expr_ty
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)));
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}
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Ok(())
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}
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/// Returns type of this constant expression.
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fn expr_const_type(init_expr: &InitExpr, globals: &[GlobalType]) -> Result<ValueType, Error> {
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let code = init_expr.code();
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if code.len() != 2 {
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return Err(Error(
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"Init expression should always be with length 2".into(),
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));
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}
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let expr_ty: ValueType = match code[0] {
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Instruction::I32Const(_) => ValueType::I32,
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Instruction::I64Const(_) => ValueType::I64,
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Instruction::F32Const(_) => ValueType::F32,
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Instruction::F64Const(_) => ValueType::F64,
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Instruction::GetGlobal(idx) => match globals.get(idx as usize) {
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Some(target_global) => {
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if target_global.is_mutable() {
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return Err(Error(format!("Global {} is mutable", idx)));
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}
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target_global.content_type()
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}
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None => {
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return Err(Error(format!(
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"Global {} doesn't exists or not yet defined",
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idx
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)));
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}
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},
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_ => return Err(Error("Non constant opcode in init expr".into())),
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};
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if code[1] != Instruction::End {
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return Err(Error("Expression doesn't ends with `end` opcode".into()));
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}
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Ok(expr_ty)
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}
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