fix(audit): merkle library audit fixes #1606
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!--
🚨 ATTENTION! 🚨
This PR template is REQUIRED. PRs not following this format will be
closed without review.
Requirements:
- PR title must follow commit conventions:
https://www.conventionalcommits.org/en/v1.0.0/
- Label your PR with the correct type (e.g., 🐛 Bug, ✨ Enhancement, 🧪
Test, etc.)
- Provide clear and specific details in each section
-->
**Motivation:**
As part of an audit for the Merkle library, several low and
informational findings were found. This PR consolidates all
informational findings to fix, as well as additional commits for
findings discovered along the way, with a specific commit for each
finding.
All Lows are separated into individual PRs into the
[release-dev/merkle-audit-fixes](https://github.com/Layr-Labs/eigenlayer-contracts/tree/release-dev/merkle-audit-fixes)
branch
**Modifications:**
* Completely uplifted natspec, matching current EigenLayer quality and
standards
* Four new error codes:
* `InvalidIndex` for indices outside of the Merkle tree's max index
* `LeavesNotPowerOfTwo` for leaves (particularly for SHA256 functions)
that don't match the expected length condition
* `NoLeaves` for an empty `leaves` array
* `NotEnoughLeaves` for leaves (particularly for SHA256 functions) that
are not 2 or greater
* Explicit return in `processInclusionProofKeccak` for 0 length proofs
to return the leaf
* Requirement in `processInclusionProof(Keccak|Sha256)` that the index
is 0, i.e. the index was for a leaf within the tree
* Refactoring in `merkleize(Sha256|Keccak)` and `getProofKeccak` of
logic for readability and performance
* Newly added `getProofSha256` to mirror `getProofKeccak` to reduce
burden of producing roots offchain
* Newly added `isPowerOfTwo` helper function
* Newly added documentation file for the Merkle library
**Result:**
* Improved documentation/natspec
* Four new error codes
* Refactored and simplified code
* Newly added `getProofSha256` and `isPowerOfTwo` functions
* Updated and added unit tests
<!--
🚨 ATTENTION! 🚨
This PR template is REQUIRED. PRs not following this format will be
closed without review.
Requirements:
- PR title must follow commit conventions:
https://www.conventionalcommits.org/en/v1.0.0/
- Label your PR with the correct type (e.g., 🐛 Bug, ✨ Enhancement, 🧪
Test, etc.)
- Provide clear and specific details in each section
-->
**Motivation:**
Uninitialized roots can lead to issues like the [Nomad bridge
hack](https://medium.com/nomad-xyz-blog/nomad-bridge-hack-root-cause-analysis-875ad2e5aacd).
**Modifications:**
* New error code and documentation
* Added require statements for `verifyInclusion(Keccak|SHA256)`
* Updated documentation for existing error code
**Result:**
Guard against unintialized roots being used in proofs
nadir-akhtar
force-pushed
the
release-dev/merkle-audit-fixes
branch
from
30ec964 to
2e9066c
Compare
nadir-akhtar
changed the title
ypatil12
approved these changes
Aug 13, 2025
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Motivation:
In response to a recent audit report, we are closing out Lows and Infos related to the Merkle library.
Modifications:
Result:
Cleaner, safer code