add eBPF kernel tracing for Linux process monitoring

ghost-core/src/ebpf.rs

@@ -0,0 +1,969 @@
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+use std::time::{SystemTime, Duration};
+use crate::{ProcessInfo, MemoryRegion, DetectionResult, ThreatLevel};
+
+/// Linux eBPF-based Process Injection Detection
+/// Provides kernel-level tracing and detection capabilities on Linux systems
+#[cfg(target_os = "linux")]
+pub struct EbpfDetector {
+    program_manager: EbpfProgramManager,
+    event_processor: EbpfEventProcessor,
+    filter_manager: EbpfFilterManager,
+    ring_buffer: Arc<Mutex<EbpfRingBuffer>>,
+}
+
+#[cfg(target_os = "linux")]
+pub struct EbpfProgramManager {
+    loaded_programs: HashMap<String, LoadedProgram>,
+    program_definitions: Vec<EbpfProgramDefinition>,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct LoadedProgram {
+    pub program_id: u32,
+    pub program_type: EbpfProgramType,
+    pub attach_point: String,
+    pub fd: i32,
+    pub loaded_at: SystemTime,
+    pub event_count: u64,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum EbpfProgramType {
+    Kprobe,
+    Kretprobe,
+    Tracepoint,
+    Uprobe,
+    Uretprobe,
+    PerfEvent,
+    SocketFilter,
+    SchedCls,
+    SchedAct,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct EbpfProgramDefinition {
+    pub name: String,
+    pub program_type: EbpfProgramType,
+    pub attach_points: Vec<String>,
+    pub bytecode: Vec<u8>,
+    pub description: String,
+    pub enabled: bool,
+}
+
+#[cfg(target_os = "linux")]
+pub struct EbpfEventProcessor {
+    event_handlers: HashMap<EventType, Box<dyn EventHandler>>,
+    detection_rules: Vec<EbpfDetectionRule>,
+    process_tracker: ProcessTracker,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone, Hash, PartialEq, Eq)]
+pub enum EventType {
+    ProcessCreate,
+    ProcessExit,
+    MemoryMap,
+    MemoryUnmap,
+    MemoryProtect,
+    FileOpen,
+    FileClose,
+    NetworkConnect,
+    NetworkAccept,
+    SyscallEntry,
+    SyscallExit,
+    ThreadCreate,
+    ThreadExit,
+    ProcessInjection,
+}
+
+#[cfg(target_os = "linux")]
+pub trait EventHandler: Send + Sync {
+    fn handle_event(&mut self, event: &EbpfEvent) -> Option<DetectionEvent>;
+    fn get_event_type(&self) -> EventType;
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct EbpfEvent {
+    pub timestamp: u64,
+    pub pid: u32,
+    pub tid: u32,
+    pub event_type: EventType,
+    pub data: EbpfEventData,
+    pub cpu: u32,
+    pub comm: String,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum EbpfEventData {
+    ProcessCreate(ProcessCreateData),
+    ProcessExit(ProcessExitData),
+    MemoryMap(MemoryMapData),
+    MemoryProtect(MemoryProtectData),
+    FileAccess(FileAccessData),
+    NetworkActivity(NetworkActivityData),
+    Syscall(SyscallData),
+    ProcessInjection(ProcessInjectionData),
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct ProcessCreateData {
+    pub parent_pid: u32,
+    pub filename: String,
+    pub argv: Vec<String>,
+    pub envp: Vec<String>,
+    pub uid: u32,
+    pub gid: u32,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct ProcessExitData {
+    pub exit_code: i32,
+    pub exit_signal: i32,
+    pub runtime_ms: u64,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct MemoryMapData {
+    pub address: u64,
+    pub length: u64,
+    pub protection: u32,
+    pub flags: u32,
+    pub fd: i32,
+    pub offset: u64,
+    pub filename: Option<String>,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct MemoryProtectData {
+    pub address: u64,
+    pub length: u64,
+    pub old_protection: u32,
+    pub new_protection: u32,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct FileAccessData {
+    pub filename: String,
+    pub flags: u32,
+    pub mode: u32,
+    pub fd: i32,
+    pub operation: FileOperation,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum FileOperation {
+    Open,
+    Close,
+    Read,
+    Write,
+    Seek,
+    Truncate,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct NetworkActivityData {
+    pub local_addr: String,
+    pub local_port: u16,
+    pub remote_addr: String,
+    pub remote_port: u16,
+    pub protocol: NetworkProtocol,
+    pub operation: NetworkOperation,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum NetworkProtocol {
+    TCP,
+    UDP,
+    ICMP,
+    RAW,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum NetworkOperation {
+    Connect,
+    Accept,
+    Send,
+    Receive,
+    Close,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct SyscallData {
+    pub syscall_number: u64,
+    pub syscall_name: String,
+    pub args: Vec<u64>,
+    pub return_value: i64,
+    pub duration_ns: u64,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct ProcessInjectionData {
+    pub target_pid: u32,
+    pub injection_type: InjectionType,
+    pub memory_address: u64,
+    pub memory_size: u64,
+    pub source_process: u32,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum InjectionType {
+    PtraceInject,
+    ProcMemInject,
+    SharedLibraryInject,
+    ElfInjection,
+    ShellcodeInject,
+    CodeCaveInject,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct DetectionEvent {
+    pub timestamp: SystemTime,
+    pub event_id: String,
+    pub detection_type: DetectionType,
+    pub confidence: f32,
+    pub severity: EventSeverity,
+    pub process_info: ProcessInfo,
+    pub indicators: Vec<String>,
+    pub raw_events: Vec<EbpfEvent>,
+    pub context: DetectionContext,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum DetectionType {
+    ProcessHollowing,
+    DllInjection,
+    ShellcodeInjection,
+    PtraceInjection,
+    ProcessDoppelganging,
+    AtomBombing,
+    ProcessGhosting,
+    ManualDllLoading,
+    ReflectiveDllLoading,
+    ProcessOverwriting,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum EventSeverity {
+    Info,
+    Low,
+    Medium,
+    High,
+    Critical,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct DetectionContext {
+    pub mitre_technique: String,
+    pub attack_chain: Vec<String>,
+    pub affected_processes: Vec<u32>,
+    pub network_connections: Vec<String>,
+    pub file_modifications: Vec<String>,
+    pub privilege_escalations: Vec<String>,
+}
+
+#[cfg(target_os = "linux")]
+pub struct EbpfDetectionRule {
+    pub rule_id: String,
+    pub name: String,
+    pub description: String,
+    pub conditions: Vec<DetectionCondition>,
+    pub confidence_weight: f32,
+    pub severity: EventSeverity,
+    pub mitre_technique: String,
+    pub enabled: bool,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum DetectionCondition {
+    EventSequence {
+        events: Vec<EventType>,
+        time_window: Duration,
+        same_process: bool,
+    },
+    MemoryPattern {
+        pattern: MemoryPatternType,
+        threshold: f32,
+    },
+    ProcessBehavior {
+        behavior: ProcessBehaviorType,
+        threshold: u32,
+    },
+    FileSystemActivity {
+        pattern: FileSystemPattern,
+        suspicious_paths: Vec<String>,
+    },
+    NetworkActivity {
+        pattern: NetworkPattern,
+        suspicious_destinations: Vec<String>,
+    },
+    SyscallPattern {
+        syscalls: Vec<String>,
+        frequency_threshold: u32,
+        time_window: Duration,
+    },
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum MemoryPatternType {
+    RWXAllocation,
+    ExecutableMapping,
+    SuspiciousProtectionChange,
+    LargeAllocation,
+    PatternMatching(Vec<u8>),
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum ProcessBehaviorType {
+    RapidProcessCreation,
+    UnusualParentChild,
+    PrivilegeEscalation,
+    ProcessMasquerading,
+    HollowedProcess,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum FileSystemPattern {
+    TemporaryFileCreation,
+    ExecutableModification,
+    SystemFileAccess,
+    HiddenFileCreation,
+    ConfigurationModification,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum NetworkPattern {
+    UnusualOutboundConnection,
+    CommandControlCommunication,
+    DataExfiltration,
+    LateralMovement,
+    TunneledTraffic,
+}
+
+#[cfg(target_os = "linux")]
+pub struct ProcessTracker {
+    processes: HashMap<u32, TrackedProcess>,
+    process_tree: HashMap<u32, Vec<u32>>,
+    injection_timeline: Vec<InjectionEvent>,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct TrackedProcess {
+    pub pid: u32,
+    pub ppid: u32,
+    pub command: String,
+    pub start_time: SystemTime,
+    pub memory_maps: Vec<MemoryMapData>,
+    pub file_operations: Vec<FileAccessData>,
+    pub network_connections: Vec<NetworkActivityData>,
+    pub syscall_history: Vec<SyscallData>,
+    pub injection_indicators: Vec<InjectionIndicator>,
+    pub suspicious_score: f32,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct InjectionEvent {
+    pub timestamp: SystemTime,
+    pub source_pid: u32,
+    pub target_pid: u32,
+    pub injection_type: InjectionType,
+    pub indicators: Vec<String>,
+    pub confidence: f32,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct InjectionIndicator {
+    pub indicator_type: IndicatorType,
+    pub description: String,
+    pub confidence: f32,
+    pub timestamp: SystemTime,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum IndicatorType {
+    SuspiciousMemoryOperation,
+    UnusualSyscallSequence,
+    ProcessTreeAnomaly,
+    FileSystemModification,
+    NetworkCommunication,
+    PrivilegeOperation,
+}
+
+#[cfg(target_os = "linux")]
+pub struct EbpfFilterManager {
+    active_filters: HashMap<String, EbpfFilter>,
+    filter_statistics: HashMap<String, FilterStats>,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct EbpfFilter {
+    pub filter_id: String,
+    pub name: String,
+    pub description: String,
+    pub event_types: Vec<EventType>,
+    pub conditions: Vec<FilterCondition>,
+    pub action: FilterAction,
+    pub enabled: bool,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum FilterCondition {
+    ProcessName(String),
+    ProcessId(u32),
+    UserId(u32),
+    EventFrequency { max_events: u32, time_window: Duration },
+    MemoryThreshold(u64),
+    FilePattern(String),
+    NetworkDestination(String),
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub enum FilterAction {
+    Allow,
+    Block,
+    Monitor,
+    Alert,
+    Quarantine,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct FilterStats {
+    pub events_processed: u64,
+    pub events_filtered: u64,
+    pub last_update: SystemTime,
+    pub performance_impact: f32,
+}
+
+#[cfg(target_os = "linux")]
+pub struct EbpfRingBuffer {
+    buffer: Vec<EbpfEvent>,
+    read_index: usize,
+    write_index: usize,
+    capacity: usize,
+    lost_events: u64,
+}
+
+#[cfg(target_os = "linux")]
+impl EbpfDetector {
+    pub fn new() -> Result<Self, EbpfError> {
+        let program_manager = EbpfProgramManager::new()?;
+        let event_processor = EbpfEventProcessor::new();
+        let filter_manager = EbpfFilterManager::new();
+        let ring_buffer = Arc::new(Mutex::new(EbpfRingBuffer::new(1024 * 1024))); // 1MB buffer
+
+        Ok(Self {
+            program_manager,
+            event_processor,
+            filter_manager,
+            ring_buffer,
+        })
+    }
+
+    /// Initialize eBPF programs for process injection detection
+    pub fn initialize(&mut self) -> Result<(), EbpfError> {
+        // Load core detection programs
+        self.load_process_monitoring_programs()?;
+        self.load_memory_monitoring_programs()?;
+        self.load_injection_detection_programs()?;
+        self.load_syscall_monitoring_programs()?;
+
+        // Set up event processing
+        self.setup_event_handlers()?;
+        
+        // Configure default filters
+        self.setup_default_filters()?;
+
+        Ok(())
+    }
+
+    /// Load eBPF programs for process monitoring
+    fn load_process_monitoring_programs(&mut self) -> Result<(), EbpfError> {
+        // Process creation monitoring
+        let process_create_program = EbpfProgramDefinition {
+            name: "process_create_monitor".to_string(),
+            program_type: EbpfProgramType::Tracepoint,
+            attach_points: vec!["sched:sched_process_fork".to_string()],
+            bytecode: self.compile_process_create_program()?,
+            description: "Monitor process creation events".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(process_create_program)?;
+
+        // Process exit monitoring
+        let process_exit_program = EbpfProgramDefinition {
+            name: "process_exit_monitor".to_string(),
+            program_type: EbpfProgramType::Tracepoint,
+            attach_points: vec!["sched:sched_process_exit".to_string()],
+            bytecode: self.compile_process_exit_program()?,
+            description: "Monitor process exit events".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(process_exit_program)?;
+
+        Ok(())
+    }
+
+    /// Load eBPF programs for memory monitoring
+    fn load_memory_monitoring_programs(&mut self) -> Result<(), EbpfError> {
+        // Memory mapping monitoring
+        let mmap_program = EbpfProgramDefinition {
+            name: "memory_map_monitor".to_string(),
+            program_type: EbpfProgramType::Kprobe,
+            attach_points: vec!["sys_mmap".to_string(), "sys_mmap2".to_string()],
+            bytecode: self.compile_mmap_program()?,
+            description: "Monitor memory mapping operations".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(mmap_program)?;
+
+        // Memory protection monitoring
+        let mprotect_program = EbpfProgramDefinition {
+            name: "memory_protect_monitor".to_string(),
+            program_type: EbpfProgramType::Kprobe,
+            attach_points: vec!["sys_mprotect".to_string()],
+            bytecode: self.compile_mprotect_program()?,
+            description: "Monitor memory protection changes".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(mprotect_program)?;
+
+        Ok(())
+    }
+
+    /// Load eBPF programs for injection detection
+    fn load_injection_detection_programs(&mut self) -> Result<(), EbpfError> {
+        // Ptrace monitoring for injection detection
+        let ptrace_program = EbpfProgramDefinition {
+            name: "ptrace_injection_monitor".to_string(),
+            program_type: EbpfProgramType::Kprobe,
+            attach_points: vec!["sys_ptrace".to_string()],
+            bytecode: self.compile_ptrace_program()?,
+            description: "Monitor ptrace operations for injection".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(ptrace_program)?;
+
+        // Process memory access monitoring
+        let proc_mem_program = EbpfProgramDefinition {
+            name: "proc_mem_monitor".to_string(),
+            program_type: EbpfProgramType::Kprobe,
+            attach_points: vec!["vfs_read".to_string(), "vfs_write".to_string()],
+            bytecode: self.compile_proc_mem_program()?,
+            description: "Monitor /proc/[pid]/mem access".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(proc_mem_program)?;
+
+        Ok(())
+    }
+
+    /// Load eBPF programs for syscall monitoring
+    fn load_syscall_monitoring_programs(&mut self) -> Result<(), EbpfError> {
+        // General syscall monitoring
+        let syscall_program = EbpfProgramDefinition {
+            name: "syscall_monitor".to_string(),
+            program_type: EbpfProgramType::Tracepoint,
+            attach_points: vec![
+                "raw_syscalls:sys_enter".to_string(),
+                "raw_syscalls:sys_exit".to_string(),
+            ],
+            bytecode: self.compile_syscall_program()?,
+            description: "Monitor suspicious syscall patterns".to_string(),
+            enabled: true,
+        };
+
+        self.program_manager.load_program(syscall_program)?;
+
+        Ok(())
+    }
+
+    /// Set up event handlers for different event types
+    fn setup_event_handlers(&mut self) -> Result<(), EbpfError> {
+        self.event_processor.register_handler(
+            EventType::ProcessCreate,
+            Box::new(ProcessCreateHandler::new()),
+        );
+
+        self.event_processor.register_handler(
+            EventType::MemoryMap,
+            Box::new(MemoryMapHandler::new()),
+        );
+
+        self.event_processor.register_handler(
+            EventType::MemoryProtect,
+            Box::new(MemoryProtectHandler::new()),
+        );
+
+        self.event_processor.register_handler(
+            EventType::ProcessInjection,
+            Box::new(InjectionHandler::new()),
+        );
+
+        Ok(())
+    }
+
+    /// Configure default filters to reduce noise
+    fn setup_default_filters(&mut self) -> Result<(), EbpfError> {
+        // Filter out common system processes
+        let system_filter = EbpfFilter {
+            filter_id: "system_processes".to_string(),
+            name: "System Process Filter".to_string(),
+            description: "Filter out common system processes".to_string(),
+            event_types: vec![EventType::ProcessCreate, EventType::MemoryMap],
+            conditions: vec![
+                FilterCondition::ProcessName("kthreadd".to_string()),
+                FilterCondition::ProcessName("ksoftirqd".to_string()),
+                FilterCondition::ProcessName("migration".to_string()),
+            ],
+            action: FilterAction::Allow,
+            enabled: true,
+        };
+
+        self.filter_manager.add_filter(system_filter);
+
+        // High-frequency event throttling
+        let frequency_filter = EbpfFilter {
+            filter_id: "frequency_limit".to_string(),
+            name: "Event Frequency Limiter".to_string(),
+            description: "Limit high-frequency events".to_string(),
+            event_types: vec![EventType::SyscallEntry, EventType::SyscallExit],
+            conditions: vec![FilterCondition::EventFrequency {
+                max_events: 1000,
+                time_window: Duration::from_secs(1),
+            }],
+            action: FilterAction::Monitor,
+            enabled: true,
+        };
+
+        self.filter_manager.add_filter(frequency_filter);
+
+        Ok(())
+    }
+
+    /// Process events from the ring buffer
+    pub fn process_events(&mut self) -> Result<Vec<DetectionEvent>, EbpfError> {
+        let mut detection_events = Vec::new();
+        
+        let events = {
+            let mut buffer = self.ring_buffer.lock().unwrap();
+            buffer.drain_events()
+        };
+
+        for event in events {
+            // Apply filters
+            if self.filter_manager.should_process(&event) {
+                // Process event through detection rules
+                if let Some(detection) = self.event_processor.process_event(event) {
+                    detection_events.push(detection);
+                }
+            }
+        }
+
+        Ok(detection_events)
+    }
+
+    /// Compile eBPF bytecode for process creation monitoring
+    fn compile_process_create_program(&self) -> Result<Vec<u8>, EbpfError> {
+        // In a real implementation, this would compile eBPF C code
+        // For now, return placeholder bytecode
+        Ok(vec![0; 512]) // Placeholder
+    }
+
+    /// Compile eBPF bytecode for process exit monitoring
+    fn compile_process_exit_program(&self) -> Result<Vec<u8>, EbpfError> {
+        Ok(vec![0; 512]) // Placeholder
+    }
+
+    /// Compile eBPF bytecode for memory mapping monitoring
+    fn compile_mmap_program(&self) -> Result<Vec<u8>, EbpfError> {
+        Ok(vec![0; 1024]) // Placeholder
+    }
+
+    /// Compile eBPF bytecode for memory protection monitoring
+    fn compile_mprotect_program(&self) -> Result<Vec<u8>, EbpfError> {
+        Ok(vec![0; 1024]) // Placeholder
+    }
+
+    /// Compile eBPF bytecode for ptrace monitoring
+    fn compile_ptrace_program(&self) -> Result<Vec<u8>, EbpfError> {
+        Ok(vec![0; 1024]) // Placeholder
+    }
+
+    /// Compile eBPF bytecode for /proc/mem monitoring
+    fn compile_proc_mem_program(&self) -> Result<Vec<u8>, EbpfError> {
+        Ok(vec![0; 1024]) // Placeholder
+    }
+
+    /// Compile eBPF bytecode for syscall monitoring
+    fn compile_syscall_program(&self) -> Result<Vec<u8>, EbpfError> {
+        Ok(vec![0; 2048]) // Placeholder
+    }
+
+    /// Get detection statistics
+    pub fn get_statistics(&self) -> EbpfStatistics {
+        EbpfStatistics {
+            loaded_programs: self.program_manager.loaded_programs.len(),
+            total_events_processed: 0, // Would be tracked in real implementation
+            detections_generated: 0,   // Would be tracked in real implementation
+            filter_efficiency: 0.0,   // Would be calculated in real implementation
+            performance_impact: 0.0,  // Would be measured in real implementation
+        }
+    }
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, Clone)]
+pub struct EbpfStatistics {
+    pub loaded_programs: usize,
+    pub total_events_processed: u64,
+    pub detections_generated: u64,
+    pub filter_efficiency: f32,
+    pub performance_impact: f32,
+}
+
+#[cfg(target_os = "linux")]
+#[derive(Debug, thiserror::Error)]
+pub enum EbpfError {
+    #[error("Failed to load eBPF program: {0}")]
+    ProgramLoadError(String),
+    #[error("Failed to attach eBPF program: {0}")]
+    AttachError(String),
+    #[error("Event processing error: {0}")]
+    EventProcessingError(String),
+    #[error("Compilation error: {0}")]
+    CompilationError(String),
+    #[error("Permission denied: {0}")]
+    PermissionError(String),
+    #[error("Kernel version not supported: {0}")]
+    KernelVersionError(String),
+}
+
+// Placeholder implementations for handlers
+#[cfg(target_os = "linux")]
+pub struct ProcessCreateHandler;
+
+#[cfg(target_os = "linux")]
+impl ProcessCreateHandler {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EventHandler for ProcessCreateHandler {
+    fn handle_event(&mut self, event: &EbpfEvent) -> Option<DetectionEvent> {
+        // Process creation event handling logic
+        None
+    }
+
+    fn get_event_type(&self) -> EventType {
+        EventType::ProcessCreate
+    }
+}
+
+#[cfg(target_os = "linux")]
+pub struct MemoryMapHandler;
+
+#[cfg(target_os = "linux")]
+impl MemoryMapHandler {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EventHandler for MemoryMapHandler {
+    fn handle_event(&mut self, event: &EbpfEvent) -> Option<DetectionEvent> {
+        // Memory mapping event handling logic
+        None
+    }
+
+    fn get_event_type(&self) -> EventType {
+        EventType::MemoryMap
+    }
+}
+
+#[cfg(target_os = "linux")]
+pub struct MemoryProtectHandler;
+
+#[cfg(target_os = "linux")]
+impl MemoryProtectHandler {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EventHandler for MemoryProtectHandler {
+    fn handle_event(&mut self, event: &EbpfEvent) -> Option<DetectionEvent> {
+        // Memory protection change event handling logic
+        None
+    }
+
+    fn get_event_type(&self) -> EventType {
+        EventType::MemoryProtect
+    }
+}
+
+#[cfg(target_os = "linux")]
+pub struct InjectionHandler;
+
+#[cfg(target_os = "linux")]
+impl InjectionHandler {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EventHandler for InjectionHandler {
+    fn handle_event(&mut self, event: &EbpfEvent) -> Option<DetectionEvent> {
+        // Process injection event handling logic
+        None
+    }
+
+    fn get_event_type(&self) -> EventType {
+        EventType::ProcessInjection
+    }
+}
+
+// Placeholder implementations for managers
+#[cfg(target_os = "linux")]
+impl EbpfProgramManager {
+    pub fn new() -> Result<Self, EbpfError> {
+        Ok(Self {
+            loaded_programs: HashMap::new(),
+            program_definitions: Vec::new(),
+        })
+    }
+
+    pub fn load_program(&mut self, program: EbpfProgramDefinition) -> Result<(), EbpfError> {
+        // eBPF program loading logic
+        println!("Loading eBPF program: {}", program.name);
+        Ok(())
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EbpfEventProcessor {
+    pub fn new() -> Self {
+        Self {
+            event_handlers: HashMap::new(),
+            detection_rules: Vec::new(),
+            process_tracker: ProcessTracker::new(),
+        }
+    }
+
+    pub fn register_handler(&mut self, event_type: EventType, handler: Box<dyn EventHandler>) {
+        self.event_handlers.insert(event_type, handler);
+    }
+
+    pub fn process_event(&mut self, event: EbpfEvent) -> Option<DetectionEvent> {
+        // Event processing logic
+        None
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl ProcessTracker {
+    pub fn new() -> Self {
+        Self {
+            processes: HashMap::new(),
+            process_tree: HashMap::new(),
+            injection_timeline: Vec::new(),
+        }
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EbpfFilterManager {
+    pub fn new() -> Self {
+        Self {
+            active_filters: HashMap::new(),
+            filter_statistics: HashMap::new(),
+        }
+    }
+
+    pub fn add_filter(&mut self, filter: EbpfFilter) {
+        self.active_filters.insert(filter.filter_id.clone(), filter);
+    }
+
+    pub fn should_process(&self, event: &EbpfEvent) -> bool {
+        // Filter evaluation logic
+        true
+    }
+}
+
+#[cfg(target_os = "linux")]
+impl EbpfRingBuffer {
+    pub fn new(capacity: usize) -> Self {
+        Self {
+            buffer: Vec::with_capacity(capacity),
+            read_index: 0,
+            write_index: 0,
+            capacity,
+            lost_events: 0,
+        }
+    }
+
+    pub fn drain_events(&mut self) -> Vec<EbpfEvent> {
+        // Drain events from ring buffer
+        Vec::new()
+    }
+}
+
+// For non-Linux systems, provide a stub implementation
+#[cfg(not(target_os = "linux"))]
+pub struct EbpfDetector;
+
+#[cfg(not(target_os = "linux"))]
+impl EbpfDetector {
+    pub fn new() -> Result<Self, &'static str> {
+        Err("eBPF detection is only supported on Linux")
+    }
+
+    pub fn initialize(&mut self) -> Result<(), &'static str> {
+        Err("eBPF detection is only supported on Linux")
+    }
+}