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core/vm: return copy of input slice in identity precompile, avoid returndata copy (#25183)

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* core/vm: return copy of input slice in identity precompile.  don't deep copy return data slice upon call completion

* make use of common.CopyBytes
This commit is contained in:
jwasinger 2022-09-20 06:58:03 -06:00 committed by GitHub
parent 18a001fa3e
commit d8ada03eac
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 1 additions and 5 deletions
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2
core/vm/contracts.go
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@ -235,7 +235,7 @@ func (c *dataCopy) RequiredGas(input []byte) uint64 {
return uint64(len(input)+31)/32*params.IdentityPerWordGas + params.IdentityBaseGas
}
func (c *dataCopy) Run(in []byte) ([]byte, error) {
return in, nil
return common.CopyBytes(in), nil
}
// bigModExp implements a native big integer exponential modular operation.

4
core/vm/instructions.go
View File

@ -697,7 +697,6 @@ func opCall(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byt
}
stack.push(&temp)
if err == nil || err == ErrExecutionReverted {
ret = common.CopyBytes(ret)
scope.Memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
}
scope.Contract.Gas += returnGas
@ -733,7 +732,6 @@ func opCallCode(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([
}
stack.push(&temp)
if err == nil || err == ErrExecutionReverted {
ret = common.CopyBytes(ret)
scope.Memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
}
scope.Contract.Gas += returnGas
@ -762,7 +760,6 @@ func opDelegateCall(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext
}
stack.push(&temp)
if err == nil || err == ErrExecutionReverted {
ret = common.CopyBytes(ret)
scope.Memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
}
scope.Contract.Gas += returnGas
@ -791,7 +788,6 @@ func opStaticCall(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext)
}
stack.push(&temp)
if err == nil || err == ErrExecutionReverted {
ret = common.CopyBytes(ret)
scope.Memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
}
scope.Contract.Gas += returnGas