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add some dos protection (#8084)

This commit is contained in:
Nikolay Volf 2018-03-12 15:55:28 +03:00 committed by GitHub
parent e0a21e5aae
commit 58a1671076
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 12 deletions
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26
ethcore/wasm/src/runtime.rs
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@ -173,12 +173,14 @@ impl<'a> Runtime<'a> {
/// Intuition about the return value sense is to aswer the question 'are we allowed to continue?'
fn charge_gas(&mut self, amount: u64) -> bool {
let prev = self.gas_counter;
if prev + amount > self.gas_limit {
// exceeds gas
false
} else {
self.gas_counter = prev + amount;
true
match prev.checked_add(amount) {
// gas charge overflow protection
None => false,
Some(val) if val > self.gas_limit => false,
Some(_) => {
self.gas_counter = prev + amount;
true
}
}
}
@ -548,13 +550,13 @@ impl<'a> Runtime<'a> {
fn debug(&mut self, args: RuntimeArgs) -> Result<()>
{
let msg_ptr: u32 = args.nth_checked(0)?;
let msg_len: u32 = args.nth_checked(1)?;
trace!(target: "wasm", "Contract debug message: {}", {
let msg_ptr: u32 = args.nth_checked(0)?;
let msg_len: u32 = args.nth_checked(1)?;
let msg = String::from_utf8(self.memory.get(msg_ptr, msg_len as usize)?)
.map_err(|_| Error::BadUtf8)?;
trace!(target: "wasm", "Contract debug message: {}", msg);
String::from_utf8(self.memory.get(msg_ptr, msg_len as usize)?)
.map_err(|_| Error::BadUtf8)?
});
Ok(())
}