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Denton Liu 2016-08-11 14:34:36 -04:00
parent 058e5f0159
commit 0f1fb33d58
1 changed files with 10 additions and 9 deletions
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19
docs/common-patterns.rst
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@ -23,7 +23,7 @@ contract in order to become the "richest".
In the following contract, if you are usurped as the richest,
you will recieve the funds of the person who has gone on to
become the richest.
become the new richest.
::
@ -32,7 +32,7 @@ become the richest.
uint public mostSent;
mapping (address => uint) pending;
function WithdrawalContract() {
richest = msg.sender;
mostSent = msg.value;
@ -68,7 +68,7 @@ This is as opposed to the more intuitive sending pattern.
contract SendContract {
address public richest;
uint public mostSent;
function SendContract() {
richest = msg.sender;
mostSent = msg.value;
@ -93,12 +93,13 @@ This is as opposed to the more intuitive sending pattern.
}
Notice that, in this example, an attacker could trap the
contract into an unusable state by causing the ``richest``
to be a contract that has a fallback function which consumes
more than the 2300 gas stipend. That way, whenever ``send``
is called to deliver funds to the "poisoned" contract, it
will cause execution to always fail because there is not
enough gas to finish the execution of the fallback function.
contract into an unusable state by causing ``richest`` to be
the address of a contract that has a fallback function
which consumes more than the 2300 gas stipend. That way,
whenever ``send`` is called to deliver funds to the
"poisoned" contract, it will cause execution to always fail
because there will not be enough gas to finish the execution
of the fallback function.
.. index:: access;restricting