LXR linux/samples/kmemleak/kmemleak-test.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * samples/kmemleak/kmemleak-test.c
   4 *
   5 * Copyright (C) 2008 ARM Limited
   6 * Written by Catalin Marinas <catalin.marinas@arm.com>
   7 */
   8
   9#define pr_fmt(fmt) "kmemleak: " fmt
  10
  11#include <linux/init.h>
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <linux/slab.h>
  15#include <linux/vmalloc.h>
  16#include <linux/list.h>
  17#include <linux/percpu.h>
  18#include <linux/fdtable.h>
  19
  20#include <linux/kmemleak.h>
  21
  22struct test_node {
  23        long header[25];
  24        struct list_head list;
  25        long footer[25];
  26};
  27
  28static LIST_HEAD(test_list);
  29static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
  30
  31/*
  32 * Some very simple testing. This function needs to be extended for
  33 * proper testing.
  34 */
  35static int __init kmemleak_test_init(void)
  36{
  37        struct test_node *elem;
  38        int i;
  39
  40        pr_info("Kmemleak testing\n");
  41
  42        /* make some orphan objects */
  43        pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
  44        pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
  45        pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
  46        pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
  47        pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
  48        pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
  49        pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
  50        pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
  51#ifndef CONFIG_MODULES
  52        pr_info("kmem_cache_alloc(files_cachep) = %p\n",
  53                kmem_cache_alloc(files_cachep, GFP_KERNEL));
  54        pr_info("kmem_cache_alloc(files_cachep) = %p\n",
  55                kmem_cache_alloc(files_cachep, GFP_KERNEL));
  56#endif
  57        pr_info("vmalloc(64) = %p\n", vmalloc(64));
  58        pr_info("vmalloc(64) = %p\n", vmalloc(64));
  59        pr_info("vmalloc(64) = %p\n", vmalloc(64));
  60        pr_info("vmalloc(64) = %p\n", vmalloc(64));
  61        pr_info("vmalloc(64) = %p\n", vmalloc(64));
  62
  63        /*
  64         * Add elements to a list. They should only appear as orphan
  65         * after the module is removed.
  66         */
  67        for (i = 0; i < 10; i++) {
  68                elem = kzalloc(sizeof(*elem), GFP_KERNEL);
  69                pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
  70                if (!elem)
  71                        return -ENOMEM;
  72                INIT_LIST_HEAD(&elem->list);
  73                list_add_tail(&elem->list, &test_list);
  74        }
  75
  76        for_each_possible_cpu(i) {
  77                per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
  78                pr_info("kmalloc(129) = %p\n",
  79                        per_cpu(kmemleak_test_pointer, i));
  80        }
  81
  82        return 0;
  83}
  84module_init(kmemleak_test_init);
  85
  86static void __exit kmemleak_test_exit(void)
  87{
  88        struct test_node *elem, *tmp;
  89
  90        /*
  91         * Remove the list elements without actually freeing the
  92         * memory.
  93         */
  94        list_for_each_entry_safe(elem, tmp, &test_list, list)
  95                list_del(&elem->list);
  96}
  97module_exit(kmemleak_test_exit);
  98
  99MODULE_LICENSE("GPL");
 100