CVE-2025-71079: Linux内核NFC子系统设备注销死锁漏洞

// CVE-2025-71079 - Linux Kernel NFC Deadlock PoC // This is a conceptual PoC demonstrating the deadlock condition // Note: This requires local access and kernel development knowledge #include <stdio.h> #include <pthread.h> #include <unistd.h> // Simulated lock structures typedef struct { pthread_mutex_t mutex; } lock_t; lock_t device_lock = {PTHREAD_MUTEX_INITIALIZER}; lock_t rfkill_global_mutex = {PTHREAD_MUTEX_INITIALIZER}; // Thread A: Simulates rfkill_fop_write path void* thread_rfkill_write(void* arg) { printf("[Thread A] Attempting to acquire rfkill_global_mutex\n"); pthread_mutex_lock(&rfkill_global_mutex.mutex); printf("[Thread A] Acquired rfkill_global_mutex, now trying device_lock\n"); // This simulates: nfc_rfkill_set_block -> nfc_dev_down -> device_lock pthread_mutex_lock(&device_lock.mutex); printf("[Thread A] Acquired device_lock\n"); pthread_mutex_unlock(&device_lock.mutex); pthread_mutex_unlock(&rfkill_global_mutex.mutex); return NULL; } // Thread B: Simulates nfc_unregister_device path void* thread_unregister_device(void* arg) { sleep(1); // Ensure Thread A starts first printf("[Thread B] Attempting to acquire device_lock\n"); pthread_mutex_lock(&device_lock.mutex); printf("[Thread B] Acquired device_lock, now trying rfkill_global_mutex\n"); // This simulates: rfkill_unregister -> mutex_lock(&rfkill_global_mutex) pthread_mutex_lock(&rfkill_global_mutex.mutex); printf("[Thread B] Acquired rfkill_global_mutex\n"); pthread_mutex_unlock(&rfkill_global_mutex.mutex); pthread_mutex_unlock(&device_lock.mutex); return NULL; } int main() { pthread_t t1, t2; printf("CVE-2025-71079 Deadlock PoC\n"); printf("Starting two threads that will deadlock...\n"); pthread_create(&t1, NULL, thread_rfkill_write, NULL); pthread_create(&t2, NULL, thread_unregister_device, NULL); sleep(5); printf("DEADLOCK DETECTED: System appears to be frozen\n"); return 0; }