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Require MAX_INITCODE_SIZE limit to be satisfied during validation #125

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merged 1 commit into from
Jun 13, 2024

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@pdobacz pdobacz commented Jun 6, 2024

Pushing in form of a PR after discussion during EOF implementers call 49.

To reiterate the reasoning behind:

Synopsis of the problem:

  • subcontainer have size limit of 64K implied by the header format
  • but this doesn't apply to "top-level" containers!
  • we have EIP-3860 MAX_INITCODE_SIZE of 48K - but not part of EOF validation!
  • EVM implementations doing validate_eof and handling the containers/headers must make assumptions about the maximum size of the container to expect and handle
    • is it MAX_INITCODE_SIZE?
    • is it 64K, same as subcontainer?
    • is it whatever can be maxed out with sections, i.e. max code sections, then max of max container sections and max data size?
    • is it some yet other value?
  • for example, evmone had a subtle bug, where large top-level containers had "overflown" data_section_offset persisted in the header, because offsets were expected to not exceed 64K

Proposal

Introduce a validation rule of max top-level container size of MAX_INITCODE_SIZE 48K (or twice that constant, for practical reasons like solidity testing methods). Whenever either the bytestring being the top-level container or the declared (in the header, as discovered during header parsing) size of the top-level container exceed that, validation fails.

@pdobacz pdobacz self-assigned this Jun 6, 2024
@chfast
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chfast commented Jun 6, 2024

I agree.

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pdobacz commented Jun 10, 2024

Just got an answer from Solidity, that limiting to MAX_INITCODE_SIZE is not an issue from their POV

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pdobacz commented Jun 13, 2024

Opening an EIPs PR for this and #128, as well as putting adding EEST tests on my list.

@pdobacz pdobacz merged commit d0f35ea into main Jun 13, 2024
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@pdobacz pdobacz deleted the max-size-in-validation branch June 13, 2024 14:31
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* new(tests): EOF - EIP-3540 container size

Tests ipsilon/eof#125

* fix(tests): Adjust to container size limit

* Update tests/prague/eip7692_eof_v1/eip3540_eof_v1/test_container_size.py

* Update tests/prague/eip7692_eof_v1/eip7480_data_section/test_code_validation.py

* fix(tests): import

---------

Co-authored-by: Mario Vega <marioevz@gmail.com>
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