op-node: Generic Commitment

[trianglesphere]

Description

This is a generic commitment to be used by the op-node & op-batcher.

Metadata

• Fixes op-node: Add the Generic Commitment Type #10399

[coderabbitai]

Walkthrough

Walkthrough

The recent update introduces a new GenericCommitment type in the op-plasma system, aimed at handling a new commitment type with ID 1. This addition includes functions for creating, encoding, and decoding these commitments, facilitating their integration into the system without requiring immediate validation or server interaction.

Changes

File	Change Summary
op-plasma/commitment.go	- Added GenericCommitmentType and GenericCommitment. - New functions for handling commitments.

Assessment against linked issues

Objective	Addressed	Explanation
Add support for DA commitment type 1 (#10399)	✅
No validation should be done on the new commitment type (#10399)	✅
It does not need to reach out to the DA server yet (#10399)	✅

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Recent Review Details

Configuration used: .coderabbit.yml
Review profile: CHILL

Commits

Files that changed from the base of the PR and between fc45866 and 0653a93.

Files selected for processing (1)

• op-plasma/commitment.go (2 hunks)

Additional comments not posted (4)

op-plasma/commitment.go (4)

23-24: Constants Keccak256CommitmentType and GenericCommitmentType are well-defined.

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69-69: Type definition for GenericCommitment is clear and aligns with the PR objectives.

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71-73: Function NewGenericCommitment correctly initializes a GenericCommitment from a byte slice.

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76-78: Method Encode for GenericCommitment correctly adds a type prefix. Ensure that the prefix aligns with the system's expectations for commitment encoding.

Verification successful

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The verification process focused on ensuring that the GenericCommitmentType is used consistently within the GenericCommitment.Encode method and across the codebase where relevant. The results from the executed script show that GenericCommitmentType is defined as a CommitmentType with a value of 1 and is used in the Encode method to prepend a type byte to the commitment data. Additionally, there is a check elsewhere in the code to ensure that the first byte of a commitment matches the GenericCommitmentType.

Given this information, it appears that the usage of GenericCommitmentType is consistent and aligns with the system's expectations for commitment encoding. The method Encode correctly adds the type prefix, and the system checks this prefix correctly when needed.

Conclusion:
The Encode method for GenericCommitment is implemented correctly with respect to adding and checking the type prefix as per the system's requirements.

• The definition and usage of GenericCommitmentType are consistent and correct.
• The Encode method correctly prepends the type byte to the commitment.
• The system checks for the correct type byte in commitments elsewhere in the code.

Scripts Executed

The following scripts were executed for the analysis:

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Script:

#!/bin/bash
# Description: Verify that the commitment type prefix used in `GenericCommitment.Encode` aligns with system expectations.

# Test: Search for usage of `GenericCommitmentType` in the codebase. Expect: Consistent usage of the prefix.
rg --type go $'GenericCommitmentType'

Length of output: 371

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[semgrep-app]

Semgrep found 1 writable-filesystem-service finding:

• ops-bedrock/docker-compose.yml
  • L17 - Triage

Service 'op_stack_go_builder' is running with a writable root filesystem. This may allow malicious applications to download and run additional payloads, or modify container files. If an application inside a container has to save something temporarily consider using a tmpfs. Add 'read_only: true' to this service to prevent this.

_{Ignore this finding from writable-filesystem-service.}

Semgrep found 1 no-new-privileges finding:

• ops-bedrock/docker-compose.yml
  • L17 - Triage

Service 'op_stack_go_builder' allows for privilege escalation via setuid or setgid binaries. Add 'no-new-privileges:true' in 'security_opt' to prevent this.

_{Ignore this finding from no-new-privileges.}

[coderabbitai]

Actionable comments posted: 1

[trianglesphere]

Closing. Will be implemented in #10458