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Results tagged with contract-debugging
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user 83
questions for finding and squashing bugs in smart contracts and decentralized development
2
votes
1
answer
63
views
Why is "+=" operator used in this auction example?
Here's an auction code from blog.ethereum.org
contract auction {
address highestBidder;
uint highestBid;
mapping(address => uint) refunds;
function bid() {
if (msg.value < highestBid) thr …
- 4,308
1
vote
2
answers
769
views
Calling a contract from a called contract
I'm trying to make nested calls or whatever they are called. I always get out of gas exception. What am I missing?
From JS side I do caller.makeCall(firstAddress, secondAddress, {gas:300000, value: 3 …
- 4,308
0
votes
Accepted
Calling a contract from a called contract
Whew, I've found a bug.
So, the problem was that first.call.gas(100000) forwards to contract first exactly this amount. When EVM control reaches second.call.gas(100000) it forwards this amount to con …
- 4,308
3
votes
Accepted
Reproducing stack depth attack
Whew, I've figured it out. I couldn't make stack depth attack work with call though. I used delegatecall instead. Here's an example that shows how it works.
contract Attacker {
Victim public vict …
- 4,308
4
votes
2
answers
484
views
Reproducing stack depth attack
Victim contract allows one time withdraw only. I want to attack it using stack depth attack to withdraw everything it has. I've tried different things, but can't get the desired result. Here's where I …
- 4,308
3
votes
1
answer
1k
views
Callcode | Delegatecall don't work
I was playing around with call, delegatecall and callcode and discovered that the function reset stopped working after I had made a callcode call (here are my actions):
FROM JS SIDE:
— A.makeCall({g …
- 4,308
2
votes
Accepted
Callcode | Delegatecall don't work
The problem has to do with how variables arranged in the storage. The storage of the called and the calling contract should match.
The answer to this question can be found here https://github.com/eth …
- 4,308
24
votes
1
answer
8k
views
What are *C*, *E* and *S* properties in message call return object?
(JS)
var contract = web3.eth.contract(abiDefinition).at(address);
contract.test(value, gotResult);
function gotResult(error, result) {
if(!error) {
console.log( …
- 4,308