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Added a note about 63/64 rule

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Co-authored-by: Alex Beregszaszi <alex@rtfs.hu>
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Harikrishnan Mulackal 2021-02-08 14:19:13 +01:00 committed by GitHub
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docs/security-considerations.rst
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@ -181,14 +181,13 @@ Sending and Receiving Ether
contract. Again, the best practice here is to use a :ref:`"withdraw" contract. Again, the best practice here is to use a :ref:`"withdraw"
pattern instead of a "send" pattern <withdrawal_pattern>`. pattern instead of a "send" pattern <withdrawal_pattern>`.
Call stack Depth Call Stack Depth
================ ================
External function calls can fail any time because they exceed the maximum External function calls can fail any time because they exceed the maximum
call stack of 1024. In such situations, Solidity throws an exception. call stack of 1024. In such situations, Solidity throws an exception.
Malicious actors might be able to force the call stack to a high value Malicious actors might be able to force the call stack to a high value
before they interact with your contract, by controlling the number of calls before they interact with your contract. Note that, since [Tangerine Whistle](https://eips.ethereum.org/EIPS/eip-608) hardfork, the [63/64 rule](https://eips.ethereum.org/EIPS/eip-150) makes call stack depth attack impractical. Also note that the call stack and the expression stack are unrelated, even though both have a size limit of 1024 stack slots.
and local function variables on the stack.
Note that ``.send()`` does **not** throw an exception if the call stack is Note that ``.send()`` does **not** throw an exception if the call stack is
depleted but rather returns ``false`` in that case. The low-level functions depleted but rather returns ``false`` in that case. The low-level functions