[people/arne_f/kernel.git] / lib / test_kasan.c

/*
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
 * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#define pr_fmt(fmt) "kasan test: %s " fmt, __func__

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/kasan.h>

/*
 * Note: test functions are marked noinline so that their names appear in
 * reports.
 */

static noinline void __init kmalloc_oob_right(void)
{
	char *ptr;
	size_t size = 123;

	pr_info("out-of-bounds to right\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	ptr[size] = 'x';
	kfree(ptr);
}

static noinline void __init kmalloc_oob_left(void)
{
	char *ptr;
	size_t size = 15;

	pr_info("out-of-bounds to left\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	*ptr = *(ptr - 1);
	kfree(ptr);
}

static noinline void __init kmalloc_node_oob_right(void)
{
	char *ptr;
	size_t size = 4096;

	pr_info("kmalloc_node(): out-of-bounds to right\n");
	ptr = kmalloc_node(size, GFP_KERNEL, 0);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	ptr[size] = 0;
	kfree(ptr);
}

#ifdef CONFIG_SLUB
static noinline void __init kmalloc_pagealloc_oob_right(void)
{
	char *ptr;
	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;

	/* Allocate a chunk that does not fit into a SLUB cache to trigger
	 * the page allocator fallback.
	 */
	pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	ptr[size] = 0;
	kfree(ptr);
}
#endif

static noinline void __init kmalloc_large_oob_right(void)
{
	char *ptr;
	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
	/* Allocate a chunk that is large enough, but still fits into a slab
	 * and does not trigger the page allocator fallback in SLUB.
	 */
	pr_info("kmalloc large allocation: out-of-bounds to right\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	ptr[size] = 0;
	kfree(ptr);
}

static noinline void __init kmalloc_oob_krealloc_more(void)
{
	char *ptr1, *ptr2;
	size_t size1 = 17;
	size_t size2 = 19;

	pr_info("out-of-bounds after krealloc more\n");
	ptr1 = kmalloc(size1, GFP_KERNEL);
	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	if (!ptr1 || !ptr2) {
		pr_err("Allocation failed\n");
		kfree(ptr1);
		kfree(ptr2);
		return;
	}

	ptr2[size2] = 'x';
	kfree(ptr2);
}

static noinline void __init kmalloc_oob_krealloc_less(void)
{
	char *ptr1, *ptr2;
	size_t size1 = 17;
	size_t size2 = 15;

	pr_info("out-of-bounds after krealloc less\n");
	ptr1 = kmalloc(size1, GFP_KERNEL);
	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	if (!ptr1 || !ptr2) {
		pr_err("Allocation failed\n");
		kfree(ptr1);
		return;
	}
	ptr2[size2] = 'x';
	kfree(ptr2);
}

static noinline void __init kmalloc_oob_16(void)
{
	struct {
		u64 words[2];
	} *ptr1, *ptr2;

	pr_info("kmalloc out-of-bounds for 16-bytes access\n");
	ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
	ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
	if (!ptr1 || !ptr2) {
		pr_err("Allocation failed\n");
		kfree(ptr1);
		kfree(ptr2);
		return;
	}
	*ptr1 = *ptr2;
	kfree(ptr1);
	kfree(ptr2);
}

static noinline void __init kmalloc_oob_memset_2(void)
{
	char *ptr;
	size_t size = 8;

	pr_info("out-of-bounds in memset2\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	memset(ptr+7, 0, 2);
	kfree(ptr);
}

static noinline void __init kmalloc_oob_memset_4(void)
{
	char *ptr;
	size_t size = 8;

	pr_info("out-of-bounds in memset4\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	memset(ptr+5, 0, 4);
	kfree(ptr);
}


static noinline void __init kmalloc_oob_memset_8(void)
{
	char *ptr;
	size_t size = 8;

	pr_info("out-of-bounds in memset8\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	memset(ptr+1, 0, 8);
	kfree(ptr);
}

static noinline void __init kmalloc_oob_memset_16(void)
{
	char *ptr;
	size_t size = 16;

	pr_info("out-of-bounds in memset16\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	memset(ptr+1, 0, 16);
	kfree(ptr);
}

static noinline void __init kmalloc_oob_in_memset(void)
{
	char *ptr;
	size_t size = 666;

	pr_info("out-of-bounds in memset\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	memset(ptr, 0, size+5);
	kfree(ptr);
}

static noinline void __init kmalloc_uaf(void)
{
	char *ptr;
	size_t size = 10;

	pr_info("use-after-free\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	kfree(ptr);
	*(ptr + 8) = 'x';
}

static noinline void __init kmalloc_uaf_memset(void)
{
	char *ptr;
	size_t size = 33;

	pr_info("use-after-free in memset\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}

	kfree(ptr);
	memset(ptr, 0, size);
}

static noinline void __init kmalloc_uaf2(void)
{
	char *ptr1, *ptr2;
	size_t size = 43;

	pr_info("use-after-free after another kmalloc\n");
	ptr1 = kmalloc(size, GFP_KERNEL);
	if (!ptr1) {
		pr_err("Allocation failed\n");
		return;
	}

	kfree(ptr1);
	ptr2 = kmalloc(size, GFP_KERNEL);
	if (!ptr2) {
		pr_err("Allocation failed\n");
		return;
	}

	ptr1[40] = 'x';
	if (ptr1 == ptr2)
		pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
	kfree(ptr2);
}

static noinline void __init kmem_cache_oob(void)
{
	char *p;
	size_t size = 200;
	struct kmem_cache *cache = kmem_cache_create("test_cache",
						size, 0,
						0, NULL);
	if (!cache) {
		pr_err("Cache allocation failed\n");
		return;
	}
	pr_info("out-of-bounds in kmem_cache_alloc\n");
	p = kmem_cache_alloc(cache, GFP_KERNEL);
	if (!p) {
		pr_err("Allocation failed\n");
		kmem_cache_destroy(cache);
		return;
	}

	*p = p[size];
	kmem_cache_free(cache, p);
	kmem_cache_destroy(cache);
}

static noinline void __init memcg_accounted_kmem_cache(void)
{
	int i;
	char *p;
	size_t size = 200;
	struct kmem_cache *cache;

	cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
	if (!cache) {
		pr_err("Cache allocation failed\n");
		return;
	}

	pr_info("allocate memcg accounted object\n");
	/*
	 * Several allocations with a delay to allow for lazy per memcg kmem
	 * cache creation.
	 */
	for (i = 0; i < 5; i++) {
		p = kmem_cache_alloc(cache, GFP_KERNEL);
		if (!p) {
			pr_err("Allocation failed\n");
			goto free_cache;
		}
		kmem_cache_free(cache, p);
		msleep(100);
	}

free_cache:
	kmem_cache_destroy(cache);
}

static char global_array[10];

static noinline void __init kasan_global_oob(void)
{
	volatile int i = 3;
	char *p = &global_array[ARRAY_SIZE(global_array) + i];

	pr_info("out-of-bounds global variable\n");
	*(volatile char *)p;
}

static noinline void __init kasan_stack_oob(void)
{
	char stack_array[10];
	volatile int i = 0;
	char *p = &stack_array[ARRAY_SIZE(stack_array) + i];

	pr_info("out-of-bounds on stack\n");
	*(volatile char *)p;
}

static noinline void __init ksize_unpoisons_memory(void)
{
	char *ptr;
	size_t size = 123, real_size;

	pr_info("ksize() unpoisons the whole allocated chunk\n");
	ptr = kmalloc(size, GFP_KERNEL);
	if (!ptr) {
		pr_err("Allocation failed\n");
		return;
	}
	real_size = ksize(ptr);
	/* This access doesn't trigger an error. */
	ptr[size] = 'x';
	/* This one does. */
	ptr[real_size] = 'y';
	kfree(ptr);
}

static noinline void __init copy_user_test(void)
{
	char *kmem;
	char __user *usermem;
	size_t size = 10;
	int unused;

	kmem = kmalloc(size, GFP_KERNEL);
	if (!kmem)
		return;

	usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
			    PROT_READ | PROT_WRITE | PROT_EXEC,
			    MAP_ANONYMOUS | MAP_PRIVATE, 0);
	if (IS_ERR(usermem)) {
		pr_err("Failed to allocate user memory\n");
		kfree(kmem);
		return;
	}

	pr_info("out-of-bounds in copy_from_user()\n");
	unused = copy_from_user(kmem, usermem, size + 1);

	pr_info("out-of-bounds in copy_to_user()\n");
	unused = copy_to_user(usermem, kmem, size + 1);

	pr_info("out-of-bounds in __copy_from_user()\n");
	unused = __copy_from_user(kmem, usermem, size + 1);

	pr_info("out-of-bounds in __copy_to_user()\n");
	unused = __copy_to_user(usermem, kmem, size + 1);

	pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
	unused = __copy_from_user_inatomic(kmem, usermem, size + 1);

	pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
	unused = __copy_to_user_inatomic(usermem, kmem, size + 1);

	pr_info("out-of-bounds in strncpy_from_user()\n");
	unused = strncpy_from_user(kmem, usermem, size + 1);

	vm_munmap((unsigned long)usermem, PAGE_SIZE);
	kfree(kmem);
}

static noinline void __init use_after_scope_test(void)
{
	volatile char *volatile p;

	pr_info("use-after-scope on int\n");
	{
		int local = 0;

		p = (char *)&local;
	}
	p[0] = 1;
	p[3] = 1;

	pr_info("use-after-scope on array\n");
	{
		char local[1024] = {0};

		p = local;
	}
	p[0] = 1;
	p[1023] = 1;
}

static int __init kmalloc_tests_init(void)
{
	/*
	 * Temporarily enable multi-shot mode. Otherwise, we'd only get a
	 * report for the first case.
	 */
	bool multishot = kasan_save_enable_multi_shot();

	kmalloc_oob_right();
	kmalloc_oob_left();
	kmalloc_node_oob_right();
#ifdef CONFIG_SLUB
	kmalloc_pagealloc_oob_right();
#endif
	kmalloc_large_oob_right();
	kmalloc_oob_krealloc_more();
	kmalloc_oob_krealloc_less();
	kmalloc_oob_16();
	kmalloc_oob_in_memset();
	kmalloc_oob_memset_2();
	kmalloc_oob_memset_4();
	kmalloc_oob_memset_8();
	kmalloc_oob_memset_16();
	kmalloc_uaf();
	kmalloc_uaf_memset();
	kmalloc_uaf2();
	kmem_cache_oob();
	memcg_accounted_kmem_cache();
	kasan_stack_oob();
	kasan_global_oob();
	ksize_unpoisons_memory();
	copy_user_test();
	use_after_scope_test();

	kasan_restore_multi_shot(multishot);

	return -EAGAIN;
}

module_init(kmalloc_tests_init);
MODULE_LICENSE("GPL");
Commit	Line	Data
3f15801c AR	1	/*
	2	*
	3	* Copyright (c) 2014 Samsung Electronics Co., Ltd.
	4	* Author: Andrey Ryabinin <a.ryabinin@samsung.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
	13
0386bf38	14	#include <linux/delay.h>
3f15801c	15	#include <linux/kernel.h>
eae08dca AR	16	#include <linux/mman.h>
eae08dca AR	17	#include <linux/mm.h>
3f15801c AR	18	#include <linux/printk.h>
	19	#include <linux/slab.h>
	20	#include <linux/string.h>
eae08dca	21	#include <linux/uaccess.h>
3f15801c	22	#include <linux/module.h>
b0845ce5	23	#include <linux/kasan.h>
3f15801c	24
828347f8 DV	25	/*
	26	* Note: test functions are marked noinline so that their names appear in
	27	* reports.
	28	*/
	29
3f15801c AR	30	static noinline void __init kmalloc_oob_right(void)
	31	{
	32	char *ptr;
	33	size_t size = 123;
	34
	35	pr_info("out-of-bounds to right\n");
	36	ptr = kmalloc(size, GFP_KERNEL);
	37	if (!ptr) {
	38	pr_err("Allocation failed\n");
	39	return;
	40	}
	41
	42	ptr[size] = 'x';
	43	kfree(ptr);
	44	}
	45
	46	static noinline void __init kmalloc_oob_left(void)
	47	{
	48	char *ptr;
	49	size_t size = 15;
	50
	51	pr_info("out-of-bounds to left\n");
	52	ptr = kmalloc(size, GFP_KERNEL);
	53	if (!ptr) {
	54	pr_err("Allocation failed\n");
	55	return;
	56	}
	57
	58	ptr = (ptr - 1);
	59	kfree(ptr);
	60	}
	61
	62	static noinline void __init kmalloc_node_oob_right(void)
	63	{
	64	char *ptr;
	65	size_t size = 4096;
	66
	67	pr_info("kmalloc_node(): out-of-bounds to right\n");
	68	ptr = kmalloc_node(size, GFP_KERNEL, 0);
	69	if (!ptr) {
	70	pr_err("Allocation failed\n");
	71	return;
	72	}
	73
	74	ptr[size] = 0;
	75	kfree(ptr);
	76	}
	77
e6e8379c AP	78	#ifdef CONFIG_SLUB
e6e8379c AP	79	static noinline void __init kmalloc_pagealloc_oob_right(void)
3f15801c AR	80	{
	81	char *ptr;
	82	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
	83
e6e8379c AP	84	/* Allocate a chunk that does not fit into a SLUB cache to trigger
	85	* the page allocator fallback.
	86	*/
	87	pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
	88	ptr = kmalloc(size, GFP_KERNEL);
	89	if (!ptr) {
	90	pr_err("Allocation failed\n");
	91	return;
	92	}
	93
	94	ptr[size] = 0;
	95	kfree(ptr);
	96	}
	97	#endif
	98
	99	static noinline void __init kmalloc_large_oob_right(void)
	100	{
	101	char *ptr;
	102	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
	103	/* Allocate a chunk that is large enough, but still fits into a slab
	104	* and does not trigger the page allocator fallback in SLUB.
	105	*/
3f15801c AR	106	pr_info("kmalloc large allocation: out-of-bounds to right\n");
	107	ptr = kmalloc(size, GFP_KERNEL);
	108	if (!ptr) {
	109	pr_err("Allocation failed\n");
	110	return;
	111	}
	112
	113	ptr[size] = 0;
	114	kfree(ptr);
	115	}
	116
	117	static noinline void __init kmalloc_oob_krealloc_more(void)
	118	{
	119	char ptr1, ptr2;
	120	size_t size1 = 17;
	121	size_t size2 = 19;
	122
	123	pr_info("out-of-bounds after krealloc more\n");
	124	ptr1 = kmalloc(size1, GFP_KERNEL);
	125	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	126	if (!ptr1 \|\| !ptr2) {
	127	pr_err("Allocation failed\n");
	128	kfree(ptr1);
06495469	129	kfree(ptr2);
3f15801c AR	130	return;
	131	}
	132
	133	ptr2[size2] = 'x';
	134	kfree(ptr2);
	135	}
	136
	137	static noinline void __init kmalloc_oob_krealloc_less(void)
	138	{
	139	char ptr1, ptr2;
	140	size_t size1 = 17;
	141	size_t size2 = 15;
	142
	143	pr_info("out-of-bounds after krealloc less\n");
	144	ptr1 = kmalloc(size1, GFP_KERNEL);
	145	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	146	if (!ptr1 \|\| !ptr2) {
	147	pr_err("Allocation failed\n");
	148	kfree(ptr1);
	149	return;
	150	}
6b4a35fc	151	ptr2[size2] = 'x';
3f15801c AR	152	kfree(ptr2);
	153	}
	154
	155	static noinline void __init kmalloc_oob_16(void)
	156	{
	157	struct {
	158	u64 words[2];
	159	} ptr1, ptr2;
	160
	161	pr_info("kmalloc out-of-bounds for 16-bytes access\n");
	162	ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
	163	ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
	164	if (!ptr1 \|\| !ptr2) {
	165	pr_err("Allocation failed\n");
	166	kfree(ptr1);
	167	kfree(ptr2);
	168	return;
	169	}
	170	ptr1 = ptr2;
	171	kfree(ptr1);
	172	kfree(ptr2);
	173	}
	174
f523e737 WL	175	static noinline void __init kmalloc_oob_memset_2(void)
	176	{
	177	char *ptr;
	178	size_t size = 8;
	179
	180	pr_info("out-of-bounds in memset2\n");
	181	ptr = kmalloc(size, GFP_KERNEL);
	182	if (!ptr) {
	183	pr_err("Allocation failed\n");
	184	return;
	185	}
	186
	187	memset(ptr+7, 0, 2);
	188	kfree(ptr);
	189	}
	190
	191	static noinline void __init kmalloc_oob_memset_4(void)
	192	{
	193	char *ptr;
	194	size_t size = 8;
	195
	196	pr_info("out-of-bounds in memset4\n");
	197	ptr = kmalloc(size, GFP_KERNEL);
	198	if (!ptr) {
	199	pr_err("Allocation failed\n");
	200	return;
	201	}
	202
	203	memset(ptr+5, 0, 4);
	204	kfree(ptr);
	205	}
	206
	207
	208	static noinline void __init kmalloc_oob_memset_8(void)
	209	{
	210	char *ptr;
	211	size_t size = 8;
	212
	213	pr_info("out-of-bounds in memset8\n");
	214	ptr = kmalloc(size, GFP_KERNEL);
	215	if (!ptr) {
	216	pr_err("Allocation failed\n");
	217	return;
	218	}
	219
	220	memset(ptr+1, 0, 8);
	221	kfree(ptr);
	222	}
	223
	224	static noinline void __init kmalloc_oob_memset_16(void)
	225	{
	226	char *ptr;
	227	size_t size = 16;
	228
	229	pr_info("out-of-bounds in memset16\n");
	230	ptr = kmalloc(size, GFP_KERNEL);
	231	if (!ptr) {
	232	pr_err("Allocation failed\n");
	233	return;
	234	}
	235
	236	memset(ptr+1, 0, 16);
	237	kfree(ptr);
	238	}
239
3f15801c AR	240	static noinline void __init kmalloc_oob_in_memset(void)
	241	{
	242	char *ptr;
	243	size_t size = 666;
	244
	245	pr_info("out-of-bounds in memset\n");
	246	ptr = kmalloc(size, GFP_KERNEL);
	247	if (!ptr) {
	248	pr_err("Allocation failed\n");
	249	return;
	250	}
	251
	252	memset(ptr, 0, size+5);
	253	kfree(ptr);
	254	}
	255
	256	static noinline void __init kmalloc_uaf(void)
	257	{
	258	char *ptr;
	259	size_t size = 10;
	260
	261	pr_info("use-after-free\n");
	262	ptr = kmalloc(size, GFP_KERNEL);
	263	if (!ptr) {
	264	pr_err("Allocation failed\n");
	265	return;
	266	}
	267
	268	kfree(ptr);
	269	*(ptr + 8) = 'x';
	270	}
	271
	272	static noinline void __init kmalloc_uaf_memset(void)
	273	{
	274	char *ptr;
	275	size_t size = 33;
	276
	277	pr_info("use-after-free in memset\n");
	278	ptr = kmalloc(size, GFP_KERNEL);
	279	if (!ptr) {
	280	pr_err("Allocation failed\n");
	281	return;
	282	}
	283
	284	kfree(ptr);
	285	memset(ptr, 0, size);
	286	}
	287
	288	static noinline void __init kmalloc_uaf2(void)
	289	{
	290	char ptr1, ptr2;
	291	size_t size = 43;
	292
	293	pr_info("use-after-free after another kmalloc\n");
	294	ptr1 = kmalloc(size, GFP_KERNEL);
	295	if (!ptr1) {
	296	pr_err("Allocation failed\n");
	297	return;
	298	}
	299
	300	kfree(ptr1);
	301	ptr2 = kmalloc(size, GFP_KERNEL);
	302	if (!ptr2) {
	303	pr_err("Allocation failed\n");
304	return;
305	}
306
307	ptr1[40] = 'x';
9dcadd38 AP	308	if (ptr1 == ptr2)
9dcadd38 AP	309	pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
3f15801c AR	310	kfree(ptr2);
	311	}
	312
	313	static noinline void __init kmem_cache_oob(void)
	314	{
	315	char *p;
	316	size_t size = 200;
	317	struct kmem_cache *cache = kmem_cache_create("test_cache",
	318	size, 0,
	319	0, NULL);
	320	if (!cache) {
	321	pr_err("Cache allocation failed\n");
	322	return;
	323	}
	324	pr_info("out-of-bounds in kmem_cache_alloc\n");
	325	p = kmem_cache_alloc(cache, GFP_KERNEL);
	326	if (!p) {
	327	pr_err("Allocation failed\n");
	328	kmem_cache_destroy(cache);
	329	return;
	330	}
	331
	332	*p = p[size];
	333	kmem_cache_free(cache, p);
	334	kmem_cache_destroy(cache);
	335	}
	336
0386bf38 GT	337	static noinline void __init memcg_accounted_kmem_cache(void)
	338	{
	339	int i;
	340	char *p;
	341	size_t size = 200;
	342	struct kmem_cache *cache;
	343
	344	cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
	345	if (!cache) {
	346	pr_err("Cache allocation failed\n");
	347	return;
	348	}
	349
	350	pr_info("allocate memcg accounted object\n");
	351	/*
	352	* Several allocations with a delay to allow for lazy per memcg kmem
	353	* cache creation.
	354	*/
	355	for (i = 0; i < 5; i++) {
	356	p = kmem_cache_alloc(cache, GFP_KERNEL);
	357	if (!p) {
	358	pr_err("Allocation failed\n");
	359	goto free_cache;
	360	}
	361	kmem_cache_free(cache, p);
	362	msleep(100);
	363	}
	364
	365	free_cache:
	366	kmem_cache_destroy(cache);
	367	}
	368
3f15801c AR	369	static char global_array[10];
	370
	371	static noinline void __init kasan_global_oob(void)
	372	{
	373	volatile int i = 3;
	374	char *p = &global_array[ARRAY_SIZE(global_array) + i];
	375
	376	pr_info("out-of-bounds global variable\n");
	377	(volatile char )p;
	378	}
	379
	380	static noinline void __init kasan_stack_oob(void)
	381	{
	382	char stack_array[10];
	383	volatile int i = 0;
	384	char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
	385
	386	pr_info("out-of-bounds on stack\n");
	387	(volatile char )p;
	388	}
	389
96fe805f AP	390	static noinline void __init ksize_unpoisons_memory(void)
	391	{
	392	char *ptr;
13a1d1ad	393	size_t size = 123, real_size;
96fe805f AP	394
	395	pr_info("ksize() unpoisons the whole allocated chunk\n");
	396	ptr = kmalloc(size, GFP_KERNEL);
	397	if (!ptr) {
	398	pr_err("Allocation failed\n");
	399	return;
	400	}
	401	real_size = ksize(ptr);
	402	/* This access doesn't trigger an error. */
	403	ptr[size] = 'x';
	404	/* This one does. */
	405	ptr[real_size] = 'y';
	406	kfree(ptr);
	407	}
	408
eae08dca AR	409	static noinline void __init copy_user_test(void)
	410	{
	411	char *kmem;
	412	char __user *usermem;
	413	size_t size = 10;
	414	int unused;
	415
	416	kmem = kmalloc(size, GFP_KERNEL);
	417	if (!kmem)
	418	return;
	419
	420	usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
	421	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	422	MAP_ANONYMOUS \| MAP_PRIVATE, 0);
	423	if (IS_ERR(usermem)) {
	424	pr_err("Failed to allocate user memory\n");
	425	kfree(kmem);
	426	return;
	427	}
	428
	429	pr_info("out-of-bounds in copy_from_user()\n");
	430	unused = copy_from_user(kmem, usermem, size + 1);
	431
	432	pr_info("out-of-bounds in copy_to_user()\n");
	433	unused = copy_to_user(usermem, kmem, size + 1);
	434
	435	pr_info("out-of-bounds in __copy_from_user()\n");
	436	unused = __copy_from_user(kmem, usermem, size + 1);
	437
	438	pr_info("out-of-bounds in __copy_to_user()\n");
	439	unused = __copy_to_user(usermem, kmem, size + 1);
	440
	441	pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
	442	unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
	443
	444	pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
	445	unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
	446
	447	pr_info("out-of-bounds in strncpy_from_user()\n");
	448	unused = strncpy_from_user(kmem, usermem, size + 1);
	449
	450	vm_munmap((unsigned long)usermem, PAGE_SIZE);
	451	kfree(kmem);
	452	}
	453
828347f8 DV	454	static noinline void __init use_after_scope_test(void)
	455	{
	456	volatile char *volatile p;
	457
	458	pr_info("use-after-scope on int\n");
	459	{
	460	int local = 0;
	461
	462	p = (char *)&local;
	463	}
	464	p[0] = 1;
	465	p[3] = 1;
	466
	467	pr_info("use-after-scope on array\n");
	468	{
	469	char local[1024] = {0};
	470
	471	p = local;
	472	}
	473	p[0] = 1;
	474	p[1023] = 1;
	475	}
	476
3f15801c AR	477	static int __init kmalloc_tests_init(void)
3f15801c AR	478	{
b0845ce5 MR	479	/*
	480	* Temporarily enable multi-shot mode. Otherwise, we'd only get a
	481	* report for the first case.
	482	*/
	483	bool multishot = kasan_save_enable_multi_shot();
	484
3f15801c AR	485	kmalloc_oob_right();
	486	kmalloc_oob_left();
	487	kmalloc_node_oob_right();
e6e8379c AP	488	#ifdef CONFIG_SLUB
	489	kmalloc_pagealloc_oob_right();
	490	#endif
9789d8e0	491	kmalloc_large_oob_right();
3f15801c AR	492	kmalloc_oob_krealloc_more();
	493	kmalloc_oob_krealloc_less();
	494	kmalloc_oob_16();
	495	kmalloc_oob_in_memset();
f523e737 WL	496	kmalloc_oob_memset_2();
	497	kmalloc_oob_memset_4();
	498	kmalloc_oob_memset_8();
	499	kmalloc_oob_memset_16();
3f15801c AR	500	kmalloc_uaf();
	501	kmalloc_uaf_memset();
	502	kmalloc_uaf2();
	503	kmem_cache_oob();
0386bf38	504	memcg_accounted_kmem_cache();
3f15801c AR	505	kasan_stack_oob();
3f15801c AR	506	kasan_global_oob();
96fe805f	507	ksize_unpoisons_memory();
eae08dca	508	copy_user_test();
828347f8	509	use_after_scope_test();
b0845ce5 MR	510
	511	kasan_restore_multi_shot(multishot);
	512
3f15801c AR	513	return -EAGAIN;
	514	}
	515
	516	module_init(kmalloc_tests_init);
	517	MODULE_LICENSE("GPL");