Crate krastor_fuzz_core 

Krastor Fuzz Core — Coverage-guided execution engine for Solana programs.

Architecture

Fuzzer::run_one_round()
  ├─ random_action()         → pick random instruction + account params
  ├─ mutate_accounts()       → Solana-aware directed mutations
  ├─ LiteSVM::execute()      → deploy + construct + submit transaction
  ├─ check_invariants()      → user-defined post-condition checks
  └─ log_coverage()          → (optional) coverage bitmap collection

Re-exports

pub use fuzzer::Fuzzer;

Modules

crash

Crash recording — serialization, shrinking, and reproducibility.

executor

LiteSVM execution wrapper — deploys programs, constructs transactions, submits to the embedded Solana runtime, and collects results.

fuzzer

Fuzzer — main fuzzing engine that orchestrates rounds of random actions, account mutations, LiteSVM execution, and invariant checking.

invariant

Invariant runtime — user-defined post-condition checks.

mutator

Account mutators — Solana-aware directed mutations for vulnerability discovery.

Structs

CoverageBitmap

AFL-style coverage bitmap (65536 entries is standard)

FuzzAccount

FuzzAction

A single fuzzing action: one instruction invocation with specific accounts

FuzzActionSequence

Full execution round: multiple instructions in sequence

Functions

bs58_encode