CVE-2025-71298 Linux内核drm shmem组件锁缺失漏洞

/* * PoC Concept: Triggering the lock warning in drm_gem_shmem_madvise_locked * This requires a local environment with the vulnerable kernel configuration. */ #include <linux/module.h> #include <drm/drm_gem_shmem_helper.h> // Simulating the test condition that triggers the vulnerability static int __init poc_init(void) { struct drm_gem_shmem_object *shmem; int ret; // Allocate a shmem object (simplified) // In a real scenario, this involves interacting with the DRM subsystem // to create an object and then calling madvise without the lock. // The vulnerable call path: // drm_gem_shmem_madvise_locked(shmem, 0); // This would trigger the warning: // "WARNING: CPU: x PID: x at drivers/gpu/drm/drm_gem_shmem_helper.c:499" return 0; } static void __exit poc_exit(void) { } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL");