kmemleak: Simple testing module for kmemleak
This patch adds a loadable module that deliberately leaks memory. It is used for testing various memory leaking scenarios. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -358,6 +358,16 @@ config DEBUG_KMEMLEAK
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In order to access the kmemleak file, debugfs needs to be
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mounted (usually at /sys/kernel/debug).
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config DEBUG_KMEMLEAK_TEST
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tristate "Simple test for the kernel memory leak detector"
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depends on DEBUG_KMEMLEAK
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help
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Say Y or M here to build a test for the kernel memory leak
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detector. This option enables a module that explicitly leaks
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memory.
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If unsure, say N.
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config DEBUG_PREEMPT
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bool "Debug preemptible kernel"
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depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
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@ -39,3 +39,4 @@ endif
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obj-$(CONFIG_QUICKLIST) += quicklist.o
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obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
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obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
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obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o
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@ -0,0 +1,111 @@
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/*
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* mm/kmemleak-test.c
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*
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* Copyright (C) 2008 ARM Limited
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* Written by Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/list.h>
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#include <linux/percpu.h>
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#include <linux/fdtable.h>
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#include <linux/kmemleak.h>
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struct test_node {
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long header[25];
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struct list_head list;
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long footer[25];
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};
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static LIST_HEAD(test_list);
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static DEFINE_PER_CPU(void *, test_pointer);
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/*
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* Some very simple testing. This function needs to be extended for
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* proper testing.
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*/
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static int __init kmemleak_test_init(void)
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{
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struct test_node *elem;
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int i;
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printk(KERN_INFO "Kmemleak testing\n");
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/* make some orphan objects */
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pr_info("kmemleak: kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
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pr_info("kmemleak: kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
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#ifndef CONFIG_MODULES
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pr_info("kmemleak: kmem_cache_alloc(files_cachep) = %p\n",
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kmem_cache_alloc(files_cachep, GFP_KERNEL));
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pr_info("kmemleak: kmem_cache_alloc(files_cachep) = %p\n",
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kmem_cache_alloc(files_cachep, GFP_KERNEL));
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#endif
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pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
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pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
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pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
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pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
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pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
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/*
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* Add elements to a list. They should only appear as orphan
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* after the module is removed.
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*/
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for (i = 0; i < 10; i++) {
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elem = kmalloc(sizeof(*elem), GFP_KERNEL);
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pr_info("kmemleak: kmalloc(sizeof(*elem)) = %p\n", elem);
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if (!elem)
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return -ENOMEM;
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memset(elem, 0, sizeof(*elem));
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INIT_LIST_HEAD(&elem->list);
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list_add_tail(&elem->list, &test_list);
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}
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for_each_possible_cpu(i) {
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per_cpu(test_pointer, i) = kmalloc(129, GFP_KERNEL);
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pr_info("kmemleak: kmalloc(129) = %p\n",
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per_cpu(test_pointer, i));
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}
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return 0;
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}
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module_init(kmemleak_test_init);
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static void __exit kmemleak_test_exit(void)
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{
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struct test_node *elem, *tmp;
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/*
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* Remove the list elements without actually freeing the
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* memory.
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*/
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list_for_each_entry_safe(elem, tmp, &test_list, list)
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list_del(&elem->list);
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}
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module_exit(kmemleak_test_exit);
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MODULE_LICENSE("GPL");
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