7efe8bbfbf
Security Fixes: - CVE-2024-45339: Add O_EXCL flag to temp file creation in storage_write_entries() Prevents symlink attacks on predictable .tmp file paths - CVE-2025-47290: Use openat_nofollow() in storage_open() Closes TOCTOU race condition via path_sanitizer infrastructure - CVE-2025-0838: Add MAX_BATCH_SIZE=10000 to add_tasks() Prevents integer overflow in batch operations Research Trustworthiness (dataset_hash): - Deterministic file ordering: std::sort after collect_files() - Recursive directory traversal: depth-limited with cycle detection - Documented exclusions: hidden files and special files noted in API Bug Fixes: - R1: storage_init path validation for non-existent directories - R2: safe_strncpy return value check before strcat - R3: parallel_hash 256-file cap replaced with std::vector - R4: wire qi_compact_index/qi_rebuild_index stubs - R5: CompletionLatch race condition fix (hold mutex during decrement) - R6: ARMv8 SHA256 transform fix (save abcd_pre before vsha256hq_u32) - R7: fuzz_index_storage header format fix - R8: enforce null termination in add_tasks/update_tasks - R9: use 64 bytes (not 65) in combined hash to exclude null terminator - R10: status field persistence in save() New Tests: - test_recursive_dataset.cpp: Verify deterministic recursive hashing - test_storage_symlink_resistance.cpp: Verify CVE-2024-45339 fix - test_queue_index_batch_limit.cpp: Verify CVE-2025-0838 fix - test_sha256_arm_kat.cpp: ARMv8 known-answer tests - test_storage_init_new_dir.cpp: F1 verification - test_parallel_hash_large_dir.cpp: F3 verification - test_queue_index_compact.cpp: F4 verification All 8 native tests passing. Library ready for research lab deployment.
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#pragma once
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#include <condition_variable>
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#include <functional>
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#include <mutex>
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#include <queue>
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#include <thread>
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#include <vector>
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#include <cstdint>
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// Fixed-size thread pool for parallel operations.
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// Minimizes thread creation overhead for batch operations.
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class ThreadPool {
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std::vector<std::thread> workers_;
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std::queue<std::function<void()>> tasks_;
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std::mutex queue_mutex_;
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std::condition_variable condition_;
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std::condition_variable done_condition_;
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std::atomic<size_t> active_tasks_{0};
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bool stop_ = false;
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public:
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explicit ThreadPool(size_t num_threads);
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~ThreadPool();
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// Add task to queue. Thread-safe.
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void enqueue(std::function<void()> task);
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// Wait for all queued AND executing tasks to complete.
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void wait_all();
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// Get optimal thread count (capped at 8 for I/O bound work)
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static uint32_t default_thread_count();
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};
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// Synchronization primitive: wait for N completions
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class CompletionLatch {
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std::atomic<size_t> count_{0};
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std::mutex mutex_;
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std::condition_variable cv_;
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public:
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explicit CompletionLatch(size_t total) : count_(total) {}
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void arrive() {
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{
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std::lock_guard<std::mutex> lock(mutex_);
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--count_;
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}
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if (count_.load() == 0) {
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cv_.notify_all();
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}
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}
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void wait() {
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std::unique_lock<std::mutex> lock(mutex_);
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cv_.wait(lock, [&] { return count_.load() == 0; });
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}
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};
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