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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"
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
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
before they interact with your contract, by controlling the number of calls
and local function variables on the stack.
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.
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