CVE-2025-71141: Linux内核drm/tilcdc驱动探针失败时不当清理操作漏洞

// PoC for CVE-2025-71141 - Tilcdc Probe Failure Cleanup Issue // This PoC demonstrates triggering the kernel warning by manipulating // hardware probe deferral scenarios #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> /* * Trigger conditions for CVE-2025-71141: * 1. System has tilcdc DRM driver loaded * 2. Probe deferral occurs during driver initialization * 3. tilcdc_fini() is called on uninitialized resources * * Note: This is a kernel-level vulnerability. Exploitation requires: * - Access to a system with vulnerable tilcdc driver * - Ability to trigger probe deferral conditions * - Typically requires root or specific hardware access */ int main() { int fd; const char *device_paths[] = { "/dev/dri/card0", "/dev/dri/by-path/platform-tilcdc-card", NULL }; printf("CVE-2025-71141 PoC - Tilcdc Cleanup Issue\n"); printf("==========================================\n\n"); // Try to access tilcdc device nodes for (int i = 0; device_paths[i] != NULL; i++) { printf("Attempting to open: %s\n", device_paths[i]); fd = open(device_paths[i], O_RDWR); if (fd >= 0) { printf("[+] Successfully opened %s\n", device_paths[i]); close(fd); } else { printf("[-] Failed to open %s: %s\n", device_paths[i], strerror(errno)); } } printf("\n[*] To trigger vulnerability:\n"); printf(" - Load tilcdc driver with deferred probe dependencies\n"); printf(" - Monitor dmesg for kernel warnings during driver unload\n"); printf(" - Look for 'WARNING: CPU' in drm_atomic_helper_* functions\n"); return 0; } // Kernel module approach (requires kernel development): /* #include <linux/module.h> #include <linux/platform_device.h> static int tilcdc_probe_defer_test(void) { // Simulate probe deferral that triggers the vulnerability struct platform_device *pdev; // Trigger conditions: // 1. tilcdc driver probe starts // 2. Resource dependency fails (returns -EPROBE_DEFER) // 3. Driver cleanup path calls drm_atomic_helper_shutdown() // 4. Kernel warning triggered in drm_atomic_helper_crtc_duplicate_state return 0; } module_init(tilcdc_probe_defer_test); */