e3e2fcc285
* Bump parking_lot to 0.6 * Bump parity-wasm to 0.31 so it gets rid of parking_lot ref https://github.com/paritytech/parity-wasm/pull/206 * Update jsonrpc versions * Update wasmi and pwasm-utils version * Fix compile * Update jsonrpc crates
99 lines
3.3 KiB
Rust
99 lines
3.3 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! ActionParams parser for wasm
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use vm;
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use wasm_utils::{self, rules};
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use parity_wasm::elements::{self, Deserialize};
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use parity_wasm::peek_size;
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fn gas_rules(wasm_costs: &vm::WasmCosts) -> rules::Set {
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rules::Set::new(
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wasm_costs.regular,
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{
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let mut vals = ::std::collections::BTreeMap::new();
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vals.insert(rules::InstructionType::Load, rules::Metering::Fixed(wasm_costs.mem as u32));
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vals.insert(rules::InstructionType::Store, rules::Metering::Fixed(wasm_costs.mem as u32));
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vals.insert(rules::InstructionType::Div, rules::Metering::Fixed(wasm_costs.div as u32));
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vals.insert(rules::InstructionType::Mul, rules::Metering::Fixed(wasm_costs.mul as u32));
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vals
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})
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.with_grow_cost(wasm_costs.grow_mem)
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.with_forbidden_floats()
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}
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/// Splits payload to code and data according to params.params_type, also
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/// loads the module instance from payload and injects gas counter according
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/// to schedule.
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pub fn payload<'a>(params: &'a vm::ActionParams, wasm_costs: &vm::WasmCosts)
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-> Result<(elements::Module, &'a [u8]), vm::Error>
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{
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let code = match params.code {
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Some(ref code) => &code[..],
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None => { return Err(vm::Error::Wasm("Invalid wasm call".to_owned())); }
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};
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let (mut cursor, data_position) = match params.params_type {
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vm::ParamsType::Embedded => {
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let module_size = peek_size(&*code);
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(
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::std::io::Cursor::new(&code[..module_size]),
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module_size
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)
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},
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vm::ParamsType::Separate => {
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(::std::io::Cursor::new(&code[..]), 0)
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},
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};
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let deserialized_module = elements::Module::deserialize(
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&mut cursor
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).map_err(|err| {
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vm::Error::Wasm(format!("Error deserializing contract code ({:?})", err))
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})?;
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if deserialized_module.memory_section().map_or(false, |ms| ms.entries().len() > 0) {
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// According to WebAssembly spec, internal memory is hidden from embedder and should not
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// be interacted with. So we disable this kind of modules at decoding level.
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return Err(vm::Error::Wasm(format!("Malformed wasm module: internal memory")));
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}
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let contract_module = wasm_utils::inject_gas_counter(
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deserialized_module,
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&gas_rules(wasm_costs),
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).map_err(|_| vm::Error::Wasm(format!("Wasm contract error: bytecode invalid")))?;
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let contract_module = wasm_utils::stack_height::inject_limiter(
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contract_module,
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wasm_costs.max_stack_height,
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).map_err(|_| vm::Error::Wasm(format!("Wasm contract error: stack limiter failure")))?;
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let data = match params.params_type {
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vm::ParamsType::Embedded => {
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if data_position < code.len() { &code[data_position..] } else { &[] }
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},
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vm::ParamsType::Separate => {
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match params.data {
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Some(ref s) => &s[..],
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None => &[]
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}
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}
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};
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Ok((contract_module, data))
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}
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