// SPDX-License-Identifier: GPL-2.0-only /* * mm/kmemleak-test.c * * Copyright (C) 2008 ARM Limited * Written by Catalin Marinas <catalin.marinas@arm.com> */ #define pr_fmt(fmt) "kmemleak: " fmt #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/list.h> #include <linux/percpu.h> #include <linux/fdtable.h> #include <linux/kmemleak.h> struct test_node { long header[25]; struct list_head list; long footer[25]; }; static LIST_HEAD(test_list); static DEFINE_PER_CPU(void *, kmemleak_test_pointer); /* * Some very simple testing. This function needs to be extended for * proper testing. */ static int __init kmemleak_test_init(void) { struct test_node *elem; int i; pr_info("Kmemleak testing\n"); /* make some orphan objects */ pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); #ifndef CONFIG_MODULES pr_info("kmem_cache_alloc(files_cachep) = %p\n", kmem_cache_alloc(files_cachep, GFP_KERNEL)); pr_info("kmem_cache_alloc(files_cachep) = %p\n", kmem_cache_alloc(files_cachep, GFP_KERNEL)); #endif pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); /* * Add elements to a list. They should only appear as orphan * after the module is removed. */ for (i = 0; i < 10; i++) { elem = kzalloc(sizeof(*elem), GFP_KERNEL); pr_info("kzalloc(sizeof(*elem)) = %p\n", elem); if (!elem) return -ENOMEM; INIT_LIST_HEAD(&elem->list); list_add_tail(&elem->list, &test_list); } for_each_possible_cpu(i) { per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL); pr_info("kmalloc(129) = %p\n", per_cpu(kmemleak_test_pointer, i)); } return 0; } module_init(kmemleak_test_init); static void __exit kmemleak_test_exit(void) { struct test_node *elem, *tmp; /* * Remove the list elements without actually freeing the * memory. */ list_for_each_entry_safe(elem, tmp, &test_list, list) list_del(&elem->list); } module_exit(kmemleak_test_exit); MODULE_LICENSE("GPL");