cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kmemleak-test.c (2632B)

      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");