[linux.git] / lib / test_kasan.c

/*
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
 * Author: Andrey Ryabinin <[email protected]>
 *
 * 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);
		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 = 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 <[email protected]>
	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);
	129	return;
	130	}
	131
	132	ptr2[size2] = 'x';
	133	kfree(ptr2);
	134	}
	135
	136	static noinline void __init kmalloc_oob_krealloc_less(void)
	137	{
	138	char ptr1, ptr2;
	139	size_t size1 = 17;
	140	size_t size2 = 15;
	141
	142	pr_info("out-of-bounds after krealloc less\n");
	143	ptr1 = kmalloc(size1, GFP_KERNEL);
	144	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	145	if (!ptr1 \|\| !ptr2) {
	146	pr_err("Allocation failed\n");
	147	kfree(ptr1);
	148	return;
	149	}
6b4a35fc	150	ptr2[size2] = 'x';
3f15801c AR	151	kfree(ptr2);
	152	}
	153
	154	static noinline void __init kmalloc_oob_16(void)
	155	{
	156	struct {
	157	u64 words[2];
	158	} ptr1, ptr2;
	159
	160	pr_info("kmalloc out-of-bounds for 16-bytes access\n");
	161	ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
	162	ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
	163	if (!ptr1 \|\| !ptr2) {
	164	pr_err("Allocation failed\n");
	165	kfree(ptr1);
	166	kfree(ptr2);
	167	return;
	168	}
	169	ptr1 = ptr2;
	170	kfree(ptr1);
	171	kfree(ptr2);
	172	}
	173
f523e737 WL	174	static noinline void __init kmalloc_oob_memset_2(void)
	175	{
	176	char *ptr;
	177	size_t size = 8;
	178
	179	pr_info("out-of-bounds in memset2\n");
	180	ptr = kmalloc(size, GFP_KERNEL);
	181	if (!ptr) {
	182	pr_err("Allocation failed\n");
	183	return;
	184	}
	185
	186	memset(ptr+7, 0, 2);
	187	kfree(ptr);
	188	}
	189
	190	static noinline void __init kmalloc_oob_memset_4(void)
	191	{
	192	char *ptr;
	193	size_t size = 8;
	194
	195	pr_info("out-of-bounds in memset4\n");
	196	ptr = kmalloc(size, GFP_KERNEL);
	197	if (!ptr) {
	198	pr_err("Allocation failed\n");
	199	return;
	200	}
	201
	202	memset(ptr+5, 0, 4);
	203	kfree(ptr);
	204	}
	205
	206
	207	static noinline void __init kmalloc_oob_memset_8(void)
	208	{
	209	char *ptr;
	210	size_t size = 8;
	211
	212	pr_info("out-of-bounds in memset8\n");
	213	ptr = kmalloc(size, GFP_KERNEL);
	214	if (!ptr) {
	215	pr_err("Allocation failed\n");
	216	return;
	217	}
	218
	219	memset(ptr+1, 0, 8);
	220	kfree(ptr);
	221	}
	222
	223	static noinline void __init kmalloc_oob_memset_16(void)
	224	{
	225	char *ptr;
	226	size_t size = 16;
	227
	228	pr_info("out-of-bounds in memset16\n");
	229	ptr = kmalloc(size, GFP_KERNEL);
	230	if (!ptr) {
	231	pr_err("Allocation failed\n");
	232	return;
	233	}
	234
	235	memset(ptr+1, 0, 16);
	236	kfree(ptr);
	237	}
238
3f15801c AR	239	static noinline void __init kmalloc_oob_in_memset(void)
	240	{
	241	char *ptr;
	242	size_t size = 666;
	243
	244	pr_info("out-of-bounds in memset\n");
	245	ptr = kmalloc(size, GFP_KERNEL);
	246	if (!ptr) {
	247	pr_err("Allocation failed\n");
	248	return;
	249	}
	250
	251	memset(ptr, 0, size+5);
	252	kfree(ptr);
	253	}
	254
	255	static noinline void __init kmalloc_uaf(void)
	256	{
	257	char *ptr;
	258	size_t size = 10;
	259
	260	pr_info("use-after-free\n");
	261	ptr = kmalloc(size, GFP_KERNEL);
	262	if (!ptr) {
	263	pr_err("Allocation failed\n");
	264	return;
	265	}
	266
	267	kfree(ptr);
	268	*(ptr + 8) = 'x';
	269	}
	270
	271	static noinline void __init kmalloc_uaf_memset(void)
	272	{
	273	char *ptr;
	274	size_t size = 33;
	275
	276	pr_info("use-after-free in memset\n");
	277	ptr = kmalloc(size, GFP_KERNEL);
	278	if (!ptr) {
	279	pr_err("Allocation failed\n");
	280	return;
	281	}
	282
	283	kfree(ptr);
	284	memset(ptr, 0, size);
	285	}
	286
	287	static noinline void __init kmalloc_uaf2(void)
	288	{
	289	char ptr1, ptr2;
	290	size_t size = 43;
	291
	292	pr_info("use-after-free after another kmalloc\n");
	293	ptr1 = kmalloc(size, GFP_KERNEL);
	294	if (!ptr1) {
	295	pr_err("Allocation failed\n");
	296	return;
	297	}
	298
	299	kfree(ptr1);
	300	ptr2 = kmalloc(size, GFP_KERNEL);
	301	if (!ptr2) {
	302	pr_err("Allocation failed\n");
303	return;
304	}
305
306	ptr1[40] = 'x';
9dcadd38 AP	307	if (ptr1 == ptr2)
9dcadd38 AP	308	pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
3f15801c AR	309	kfree(ptr2);
	310	}
	311
	312	static noinline void __init kmem_cache_oob(void)
	313	{
	314	char *p;
	315	size_t size = 200;
	316	struct kmem_cache *cache = kmem_cache_create("test_cache",
	317	size, 0,
	318	0, NULL);
	319	if (!cache) {
	320	pr_err("Cache allocation failed\n");
	321	return;
	322	}
	323	pr_info("out-of-bounds in kmem_cache_alloc\n");
	324	p = kmem_cache_alloc(cache, GFP_KERNEL);
	325	if (!p) {
	326	pr_err("Allocation failed\n");
	327	kmem_cache_destroy(cache);
	328	return;
	329	}
	330
	331	*p = p[size];
	332	kmem_cache_free(cache, p);
	333	kmem_cache_destroy(cache);
	334	}
	335
0386bf38 GT	336	static noinline void __init memcg_accounted_kmem_cache(void)
	337	{
	338	int i;
	339	char *p;
	340	size_t size = 200;
	341	struct kmem_cache *cache;
	342
	343	cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
	344	if (!cache) {
	345	pr_err("Cache allocation failed\n");
	346	return;
	347	}
	348
	349	pr_info("allocate memcg accounted object\n");
	350	/*
	351	* Several allocations with a delay to allow for lazy per memcg kmem
	352	* cache creation.
	353	*/
	354	for (i = 0; i < 5; i++) {
	355	p = kmem_cache_alloc(cache, GFP_KERNEL);
	356	if (!p) {
	357	pr_err("Allocation failed\n");
	358	goto free_cache;
	359	}
	360	kmem_cache_free(cache, p);
	361	msleep(100);
	362	}
	363
	364	free_cache:
	365	kmem_cache_destroy(cache);
	366	}
	367
3f15801c AR	368	static char global_array[10];
	369
	370	static noinline void __init kasan_global_oob(void)
	371	{
	372	volatile int i = 3;
	373	char *p = &global_array[ARRAY_SIZE(global_array) + i];
	374
	375	pr_info("out-of-bounds global variable\n");
	376	(volatile char )p;
	377	}
	378
	379	static noinline void __init kasan_stack_oob(void)
	380	{
	381	char stack_array[10];
	382	volatile int i = 0;
	383	char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
	384
	385	pr_info("out-of-bounds on stack\n");
	386	(volatile char )p;
	387	}
	388
96fe805f AP	389	static noinline void __init ksize_unpoisons_memory(void)
	390	{
	391	char *ptr;
	392	size_t size = 123, real_size = size;
	393
	394	pr_info("ksize() unpoisons the whole allocated chunk\n");
	395	ptr = kmalloc(size, GFP_KERNEL);
	396	if (!ptr) {
	397	pr_err("Allocation failed\n");
	398	return;
	399	}
	400	real_size = ksize(ptr);
	401	/* This access doesn't trigger an error. */
	402	ptr[size] = 'x';
	403	/* This one does. */
	404	ptr[real_size] = 'y';
	405	kfree(ptr);
	406	}
	407
eae08dca AR	408	static noinline void __init copy_user_test(void)
	409	{
	410	char *kmem;
	411	char __user *usermem;
	412	size_t size = 10;
	413	int unused;
	414
	415	kmem = kmalloc(size, GFP_KERNEL);
	416	if (!kmem)
	417	return;
	418
	419	usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
	420	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	421	MAP_ANONYMOUS \| MAP_PRIVATE, 0);
	422	if (IS_ERR(usermem)) {
	423	pr_err("Failed to allocate user memory\n");
	424	kfree(kmem);
	425	return;
	426	}
	427
	428	pr_info("out-of-bounds in copy_from_user()\n");
	429	unused = copy_from_user(kmem, usermem, size + 1);
	430
	431	pr_info("out-of-bounds in copy_to_user()\n");
	432	unused = copy_to_user(usermem, kmem, size + 1);
	433
	434	pr_info("out-of-bounds in __copy_from_user()\n");
	435	unused = __copy_from_user(kmem, usermem, size + 1);
	436
	437	pr_info("out-of-bounds in __copy_to_user()\n");
	438	unused = __copy_to_user(usermem, kmem, size + 1);
	439
	440	pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
	441	unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
	442
	443	pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
	444	unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
	445
	446	pr_info("out-of-bounds in strncpy_from_user()\n");
	447	unused = strncpy_from_user(kmem, usermem, size + 1);
	448
	449	vm_munmap((unsigned long)usermem, PAGE_SIZE);
	450	kfree(kmem);
	451	}
	452
828347f8 DV	453	static noinline void __init use_after_scope_test(void)
	454	{
	455	volatile char *volatile p;
	456
	457	pr_info("use-after-scope on int\n");
	458	{
	459	int local = 0;
	460
	461	p = (char *)&local;
	462	}
	463	p[0] = 1;
	464	p[3] = 1;
	465
	466	pr_info("use-after-scope on array\n");
	467	{
	468	char local[1024] = {0};
	469
	470	p = local;
	471	}
	472	p[0] = 1;
	473	p[1023] = 1;
	474	}
	475
3f15801c AR	476	static int __init kmalloc_tests_init(void)
3f15801c AR	477	{
b0845ce5 MR	478	/*
	479	* Temporarily enable multi-shot mode. Otherwise, we'd only get a
	480	* report for the first case.
	481	*/
	482	bool multishot = kasan_save_enable_multi_shot();
	483
3f15801c AR	484	kmalloc_oob_right();
	485	kmalloc_oob_left();
	486	kmalloc_node_oob_right();
e6e8379c AP	487	#ifdef CONFIG_SLUB
	488	kmalloc_pagealloc_oob_right();
	489	#endif
9789d8e0	490	kmalloc_large_oob_right();
3f15801c AR	491	kmalloc_oob_krealloc_more();
	492	kmalloc_oob_krealloc_less();
	493	kmalloc_oob_16();
	494	kmalloc_oob_in_memset();
f523e737 WL	495	kmalloc_oob_memset_2();
	496	kmalloc_oob_memset_4();
	497	kmalloc_oob_memset_8();
	498	kmalloc_oob_memset_16();
3f15801c AR	499	kmalloc_uaf();
	500	kmalloc_uaf_memset();
	501	kmalloc_uaf2();
	502	kmem_cache_oob();
0386bf38	503	memcg_accounted_kmem_cache();
3f15801c AR	504	kasan_stack_oob();
3f15801c AR	505	kasan_global_oob();
96fe805f	506	ksize_unpoisons_memory();
eae08dca	507	copy_user_test();
828347f8	508	use_after_scope_test();
b0845ce5 MR	509
	510	kasan_restore_multi_shot(multishot);
	511
3f15801c AR	512	return -EAGAIN;
	513	}
	514
	515	module_init(kmalloc_tests_init);
	516	MODULE_LICENSE("GPL");