CVE-2025-66320 华为摄像头框架多线程竞态条件漏洞

// CVE-2025-66320 PoC - Race Condition in Camera Framework // This PoC demonstrates triggering race condition in camera framework module #include <pthread.h> #include <stdio.h> #include <unistd.h> // Simulated camera framework structures typedef struct { void* frame_buffer; int status; int ref_count; } camera_context_t; camera_context_t* cam_ctx = NULL; pthread_mutex_t cam_mutex = PTHREAD_MUTEX_INITIALIZER; // Vulnerable function - missing proper synchronization void* camera_worker_thread(void* arg) { int thread_id = *(int*)arg; for (int i = 0; i < 1000; i++) { // Race condition: non-atomic read-modify-write if (cam_ctx != NULL) { // Simulate TOCTOU race condition int old_count = cam_ctx->ref_count; // Read usleep(1); // Time window for race cam_ctx->ref_count = old_count + 1; // Modify-Write // Simulate buffer access race if (cam_ctx->frame_buffer != NULL) { // Concurrent access without lock memset(cam_ctx->frame_buffer, thread_id, 64); } } } return NULL; } // Trigger function void trigger_camera_race() { pthread_t threads[4]; int thread_ids[4] = {0, 1, 2, 3}; // Initialize camera context cam_ctx = (camera_context_t*)malloc(sizeof(camera_context_t)); cam_ctx->frame_buffer = malloc(1024); cam_ctx->status = 1; cam_ctx->ref_count = 0; printf("Starting race condition PoC for CVE-2025-66320\n"); // Create multiple threads to trigger race for (int i = 0; i < 4; i++) { pthread_create(&threads[i], NULL, camera_worker_thread, &thread_ids[i]); } // Wait for threads to complete for (int i = 0; i < 4; i++) { pthread_join(threads[i], NULL); } printf("Final ref_count: %d (expected: 4000)\n", cam_ctx->ref_count); printf("Race condition may cause inconsistent ref_count values\n"); free(cam_ctx->frame_buffer); free(cam_ctx); } int main() { trigger_camera_race(); return 0; } /* * Mitigation: * 1. Add proper mutex locks around shared resource access * 2. Use atomic operations for reference counting * 3. Implement double-checked locking pattern * 4. Add memory barriers for multi-core systems */