1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
// SPDX-License-Identifier: MIT
pragma solidity ^0.8;
/* runner.json
{
"differential": true,
"actions": [
{
"Upload": {
"code": {
"Solidity": {
"contract": "Callee"
}
}
}
},
{
"Instantiate": {
"code": {
"Solidity": {
"contract": "ReturnDataOob"
}
}
}
},
{
"Call": {
"dest": {
"Instantiated": 0
}
}
}
]
}
*/
contract Callee {
function echo(bytes memory payload) public pure returns (bytes memory) {
return payload;
}
}
contract ReturnDataOob {
fallback() external {
new Callee().echo(hex"1234");
assembly {
let pos := mload(64)
let size := add(returndatasize(), 1)
returndatacopy(pos, 0, size)
}
}
}