[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/kernel.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/module.h>

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);
}

static noinline void __init kmalloc_large_oob_right(void)
{
	char *ptr;
	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;

	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';
	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 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 int __init kmalloc_tests_init(void)
{
	kmalloc_oob_right();
	kmalloc_oob_left();
	kmalloc_node_oob_right();
	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();
	kasan_stack_oob();
	kasan_global_oob();
	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
	14	#include <linux/kernel.h>
	15	#include <linux/printk.h>
	16	#include <linux/slab.h>
	17	#include <linux/string.h>
	18	#include <linux/module.h>
	19
	20	static noinline void __init kmalloc_oob_right(void)
	21	{
	22	char *ptr;
	23	size_t size = 123;
	24
	25	pr_info("out-of-bounds to right\n");
	26	ptr = kmalloc(size, GFP_KERNEL);
	27	if (!ptr) {
	28	pr_err("Allocation failed\n");
	29	return;
	30	}
	31
	32	ptr[size] = 'x';
	33	kfree(ptr);
	34	}
	35
	36	static noinline void __init kmalloc_oob_left(void)
	37	{
	38	char *ptr;
	39	size_t size = 15;
	40
	41	pr_info("out-of-bounds to left\n");
	42	ptr = kmalloc(size, GFP_KERNEL);
	43	if (!ptr) {
	44	pr_err("Allocation failed\n");
	45	return;
	46	}
	47
	48	ptr = (ptr - 1);
	49	kfree(ptr);
	50	}
	51
	52	static noinline void __init kmalloc_node_oob_right(void)
	53	{
	54	char *ptr;
	55	size_t size = 4096;
	56
	57	pr_info("kmalloc_node(): out-of-bounds to right\n");
	58	ptr = kmalloc_node(size, GFP_KERNEL, 0);
	59	if (!ptr) {
	60	pr_err("Allocation failed\n");
	61	return;
	62	}
	63
	64	ptr[size] = 0;
65	kfree(ptr);
66	}
67
9789d8e0	68	static noinline void __init kmalloc_large_oob_right(void)
3f15801c AR	69	{
	70	char *ptr;
	71	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
	72
	73	pr_info("kmalloc large allocation: out-of-bounds to right\n");
	74	ptr = kmalloc(size, GFP_KERNEL);
	75	if (!ptr) {
	76	pr_err("Allocation failed\n");
	77	return;
	78	}
	79
	80	ptr[size] = 0;
	81	kfree(ptr);
	82	}
	83
	84	static noinline void __init kmalloc_oob_krealloc_more(void)
	85	{
	86	char ptr1, ptr2;
	87	size_t size1 = 17;
	88	size_t size2 = 19;
	89
	90	pr_info("out-of-bounds after krealloc more\n");
	91	ptr1 = kmalloc(size1, GFP_KERNEL);
	92	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	93	if (!ptr1 \|\| !ptr2) {
	94	pr_err("Allocation failed\n");
	95	kfree(ptr1);
	96	return;
	97	}
	98
	99	ptr2[size2] = 'x';
	100	kfree(ptr2);
	101	}
	102
	103	static noinline void __init kmalloc_oob_krealloc_less(void)
	104	{
	105	char ptr1, ptr2;
	106	size_t size1 = 17;
	107	size_t size2 = 15;
	108
	109	pr_info("out-of-bounds after krealloc less\n");
	110	ptr1 = kmalloc(size1, GFP_KERNEL);
	111	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	112	if (!ptr1 \|\| !ptr2) {
	113	pr_err("Allocation failed\n");
	114	kfree(ptr1);
	115	return;
	116	}
6b4a35fc	117	ptr2[size2] = 'x';
3f15801c AR	118	kfree(ptr2);
	119	}
	120
	121	static noinline void __init kmalloc_oob_16(void)
	122	{
	123	struct {
	124	u64 words[2];
	125	} ptr1, ptr2;
	126
	127	pr_info("kmalloc out-of-bounds for 16-bytes access\n");
	128	ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
	129	ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
	130	if (!ptr1 \|\| !ptr2) {
	131	pr_err("Allocation failed\n");
	132	kfree(ptr1);
	133	kfree(ptr2);
	134	return;
	135	}
	136	ptr1 = ptr2;
	137	kfree(ptr1);
	138	kfree(ptr2);
	139	}
	140
f523e737 WL	141	static noinline void __init kmalloc_oob_memset_2(void)
	142	{
	143	char *ptr;
	144	size_t size = 8;
	145
	146	pr_info("out-of-bounds in memset2\n");
	147	ptr = kmalloc(size, GFP_KERNEL);
	148	if (!ptr) {
	149	pr_err("Allocation failed\n");
	150	return;
	151	}
	152
	153	memset(ptr+7, 0, 2);
	154	kfree(ptr);
	155	}
	156
	157	static noinline void __init kmalloc_oob_memset_4(void)
	158	{
	159	char *ptr;
	160	size_t size = 8;
	161
	162	pr_info("out-of-bounds in memset4\n");
	163	ptr = kmalloc(size, GFP_KERNEL);
	164	if (!ptr) {
	165	pr_err("Allocation failed\n");
	166	return;
	167	}
	168
	169	memset(ptr+5, 0, 4);
	170	kfree(ptr);
	171	}
	172
	173
	174	static noinline void __init kmalloc_oob_memset_8(void)
	175	{
	176	char *ptr;
	177	size_t size = 8;
	178
	179	pr_info("out-of-bounds in memset8\n");
	180	ptr = kmalloc(size, GFP_KERNEL);
	181	if (!ptr) {
	182	pr_err("Allocation failed\n");
	183	return;
	184	}
	185
	186	memset(ptr+1, 0, 8);
	187	kfree(ptr);
	188	}
	189
	190	static noinline void __init kmalloc_oob_memset_16(void)
	191	{
	192	char *ptr;
	193	size_t size = 16;
	194
	195	pr_info("out-of-bounds in memset16\n");
	196	ptr = kmalloc(size, GFP_KERNEL);
	197	if (!ptr) {
	198	pr_err("Allocation failed\n");
	199	return;
	200	}
	201
	202	memset(ptr+1, 0, 16);
	203	kfree(ptr);
	204	}
205
3f15801c AR	206	static noinline void __init kmalloc_oob_in_memset(void)
	207	{
	208	char *ptr;
	209	size_t size = 666;
	210
	211	pr_info("out-of-bounds in memset\n");
	212	ptr = kmalloc(size, GFP_KERNEL);
	213	if (!ptr) {
	214	pr_err("Allocation failed\n");
	215	return;
	216	}
	217
	218	memset(ptr, 0, size+5);
	219	kfree(ptr);
	220	}
	221
	222	static noinline void __init kmalloc_uaf(void)
	223	{
	224	char *ptr;
	225	size_t size = 10;
	226
	227	pr_info("use-after-free\n");
	228	ptr = kmalloc(size, GFP_KERNEL);
	229	if (!ptr) {
	230	pr_err("Allocation failed\n");
	231	return;
	232	}
	233
	234	kfree(ptr);
	235	*(ptr + 8) = 'x';
	236	}
	237
	238	static noinline void __init kmalloc_uaf_memset(void)
	239	{
	240	char *ptr;
	241	size_t size = 33;
	242
	243	pr_info("use-after-free in memset\n");
	244	ptr = kmalloc(size, GFP_KERNEL);
	245	if (!ptr) {
	246	pr_err("Allocation failed\n");
	247	return;
	248	}
	249
	250	kfree(ptr);
	251	memset(ptr, 0, size);
	252	}
	253
	254	static noinline void __init kmalloc_uaf2(void)
	255	{
	256	char ptr1, ptr2;
	257	size_t size = 43;
	258
	259	pr_info("use-after-free after another kmalloc\n");
	260	ptr1 = kmalloc(size, GFP_KERNEL);
	261	if (!ptr1) {
	262	pr_err("Allocation failed\n");
	263	return;
	264	}
	265
	266	kfree(ptr1);
	267	ptr2 = kmalloc(size, GFP_KERNEL);
	268	if (!ptr2) {
	269	pr_err("Allocation failed\n");
270	return;
271	}
272
273	ptr1[40] = 'x';
274	kfree(ptr2);
275	}
276
277	static noinline void __init kmem_cache_oob(void)
278	{
279	char *p;
280	size_t size = 200;
281	struct kmem_cache *cache = kmem_cache_create("test_cache",
282	size, 0,
283	0, NULL);
284	if (!cache) {
285	pr_err("Cache allocation failed\n");
286	return;
287	}
288	pr_info("out-of-bounds in kmem_cache_alloc\n");
289	p = kmem_cache_alloc(cache, GFP_KERNEL);
290	if (!p) {
291	pr_err("Allocation failed\n");
292	kmem_cache_destroy(cache);
293	return;
294	}
295
296	*p = p[size];
297	kmem_cache_free(cache, p);
298	kmem_cache_destroy(cache);
299	}
300
301	static char global_array[10];
302
303	static noinline void __init kasan_global_oob(void)
304	{
305	volatile int i = 3;
306	char *p = &global_array[ARRAY_SIZE(global_array) + i];
307
308	pr_info("out-of-bounds global variable\n");
309	(volatile char )p;
310	}
311
312	static noinline void __init kasan_stack_oob(void)
313	{
314	char stack_array[10];
315	volatile int i = 0;
316	char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
317
318	pr_info("out-of-bounds on stack\n");
319	(volatile char )p;
320	}
321
322	static int __init kmalloc_tests_init(void)
323	{
324	kmalloc_oob_right();
325	kmalloc_oob_left();
326	kmalloc_node_oob_right();
9789d8e0	327	kmalloc_large_oob_right();
3f15801c AR	328	kmalloc_oob_krealloc_more();
	329	kmalloc_oob_krealloc_less();
	330	kmalloc_oob_16();
	331	kmalloc_oob_in_memset();
f523e737 WL	332	kmalloc_oob_memset_2();
	333	kmalloc_oob_memset_4();
	334	kmalloc_oob_memset_8();
	335	kmalloc_oob_memset_16();
3f15801c AR	336	kmalloc_uaf();
	337	kmalloc_uaf_memset();
	338	kmalloc_uaf2();
	339	kmem_cache_oob();
	340	kasan_stack_oob();
	341	kasan_global_oob();
	342	return -EAGAIN;
	343	}
	344
	345	module_init(kmalloc_tests_init);
	346	MODULE_LICENSE("GPL");