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Informational 20 Bitcoin

kernel: Add block validation to C header

Public commit record

What the developer wrote

Authored by TheCharlatan

78/100 · Adequate
kernel: Add block validation to C header

The added function allows the user process and validate a given block
with the chainstate manager. The *_process_block(...) function does some
preliminary checks on the block before passing it to
`ProcessNewBlock(...)`. These are similar to the checks in the
`submitblock()` rpc.

Richer processing of the block validation result will be made available
in the following commits through the validation interface.

The commits also adds a utility for deserializing a `CBlock`
(`kernel_block_create()`) that may then be passed to the library for
processing.

The tests exercise the function for both mainnet and regtest. The
commit also adds the data of 206 regtest blocks (some blocks also
contain transactions).
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context✓ Mentions testing or verification
The short version

What changed, and why it matters

This commit adds a new public library API to Bitcoin Core's 'kernel' module that lets outside programs create block objects from raw bytes and ask the chainstate manager to process/validate them. It is a feature addition, not a fix. The code mostly forwards work to existing internal validation routines and adds tests using 206 regtest blocks. There is no direct evidence in the commit that this introduces a security vulnerability, but any new block-processing surface can affect consensus-critical code paths.

Recommended action

Treat as a normal feature commit. Reviewers should verify that the new ABI correctly propagates errors, that ProcessNewBlock flags are appropriate for library callers, and that the raw-block deserialization path cannot be abused to cause excessive memory consumption or trigger consensus edge cases. No immediate security patch is indicated by this commit alone.

Security signals we found

01

New C ABI surface for block deserialization and validation

02

Calls consensus-critical ProcessNewBlock with force_processing=true and min_pow_checked=true

03

Raw pointer reinterpret_cast from const void* to const std::byte* in block deserialization

04

Adds 206 hard-coded regtest block hex strings to test data

05

No input length validation beyond DataStream/serialization exceptions

Risk score

Why this scored 20/100

Our methodology →
Potential impact 2/30
Exploitability 2/25
Stealth signal 1/15
Affected reach 3/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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