[linux-2.6-block.git] / mm / kasan / report.c

/*
 * This file contains error reporting code.
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
 * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
 *
 * Some code borrowed from https://github.com/xairy/kasan-prototype by
 *        Andrey Konovalov <adech.fo@gmail.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.
 *
 */

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/printk.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/stackdepot.h>
#include <linux/stacktrace.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/kasan.h>
#include <linux/module.h>

#include <asm/sections.h>

#include "kasan.h"
#include "../slab.h"

/* Shadow layout customization. */
#define SHADOW_BYTES_PER_BLOCK 1
#define SHADOW_BLOCKS_PER_ROW 16
#define SHADOW_BYTES_PER_ROW (SHADOW_BLOCKS_PER_ROW * SHADOW_BYTES_PER_BLOCK)
#define SHADOW_ROWS_AROUND_ADDR 2

static const void *find_first_bad_addr(const void *addr, size_t size)
{
	u8 shadow_val = *(u8 *)kasan_mem_to_shadow(addr);
	const void *first_bad_addr = addr;

	while (!shadow_val && first_bad_addr < addr + size) {
		first_bad_addr += KASAN_SHADOW_SCALE_SIZE;
		shadow_val = *(u8 *)kasan_mem_to_shadow(first_bad_addr);
	}
	return first_bad_addr;
}

static void print_error_description(struct kasan_access_info *info)
{
	const char *bug_type = "unknown-crash";
	u8 *shadow_addr;

	info->first_bad_addr = find_first_bad_addr(info->access_addr,
						info->access_size);

	shadow_addr = (u8 *)kasan_mem_to_shadow(info->first_bad_addr);

	/*
	 * If shadow byte value is in [0, KASAN_SHADOW_SCALE_SIZE) we can look
	 * at the next shadow byte to determine the type of the bad access.
	 */
	if (*shadow_addr > 0 && *shadow_addr <= KASAN_SHADOW_SCALE_SIZE - 1)
		shadow_addr++;

	switch (*shadow_addr) {
	case 0 ... KASAN_SHADOW_SCALE_SIZE - 1:
		/*
		 * In theory it's still possible to see these shadow values
		 * due to a data race in the kernel code.
		 */
		bug_type = "out-of-bounds";
		break;
	case KASAN_PAGE_REDZONE:
	case KASAN_KMALLOC_REDZONE:
		bug_type = "slab-out-of-bounds";
		break;
	case KASAN_GLOBAL_REDZONE:
		bug_type = "global-out-of-bounds";
		break;
	case KASAN_STACK_LEFT:
	case KASAN_STACK_MID:
	case KASAN_STACK_RIGHT:
	case KASAN_STACK_PARTIAL:
		bug_type = "stack-out-of-bounds";
		break;
	case KASAN_FREE_PAGE:
	case KASAN_KMALLOC_FREE:
		bug_type = "use-after-free";
		break;
	}

	pr_err("BUG: KASAN: %s in %pS at addr %p\n",
		bug_type, (void *)info->ip,
		info->access_addr);
	pr_err("%s of size %zu by task %s/%d\n",
		info->is_write ? "Write" : "Read",
		info->access_size, current->comm, task_pid_nr(current));
}

static inline bool kernel_or_module_addr(const void *addr)
{
	if (addr >= (void *)_stext && addr < (void *)_end)
		return true;
	if (is_module_address((unsigned long)addr))
		return true;
	return false;
}

static inline bool init_task_stack_addr(const void *addr)
{
	return addr >= (void *)&init_thread_union.stack &&
		(addr <= (void *)&init_thread_union.stack +
			sizeof(init_thread_union.stack));
}

#ifdef CONFIG_SLAB
static void print_track(struct kasan_track *track)
{
	pr_err("PID = %u\n", track->pid);
	if (track->stack) {
		struct stack_trace trace;

		depot_fetch_stack(track->stack, &trace);
		print_stack_trace(&trace, 0);
	} else {
		pr_err("(stack is not available)\n");
	}
}

static void object_err(struct kmem_cache *cache, struct page *page,
			void *object, char *unused_reason)
{
	struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
	struct kasan_free_meta *free_info;

	dump_stack();
	pr_err("Object at %p, in cache %s\n", object, cache->name);
	if (!(cache->flags & SLAB_KASAN))
		return;
	switch (alloc_info->state) {
	case KASAN_STATE_INIT:
		pr_err("Object not allocated yet\n");
		break;
	case KASAN_STATE_ALLOC:
		pr_err("Object allocated with size %u bytes.\n",
		       alloc_info->alloc_size);
		pr_err("Allocation:\n");
		print_track(&alloc_info->track);
		break;
	case KASAN_STATE_FREE:
	case KASAN_STATE_QUARANTINE:
		pr_err("Object freed, allocated with size %u bytes\n",
		       alloc_info->alloc_size);
		free_info = get_free_info(cache, object);
		pr_err("Allocation:\n");
		print_track(&alloc_info->track);
		pr_err("Deallocation:\n");
		print_track(&free_info->track);
		break;
	}
}
#endif

static void print_address_description(struct kasan_access_info *info)
{
	const void *addr = info->access_addr;

	if ((addr >= (void *)PAGE_OFFSET) &&
		(addr < high_memory)) {
		struct page *page = virt_to_head_page(addr);

		if (PageSlab(page)) {
			void *object;
			struct kmem_cache *cache = page->slab_cache;
			object = nearest_obj(cache, page,
						(void *)info->access_addr);
			object_err(cache, page, object,
					"kasan: bad access detected");
			return;
		}
		dump_page(page, "kasan: bad access detected");
	}

	if (kernel_or_module_addr(addr)) {
		if (!init_task_stack_addr(addr))
			pr_err("Address belongs to variable %pS\n", addr);
	}
	dump_stack();
}

static bool row_is_guilty(const void *row, const void *guilty)
{
	return (row <= guilty) && (guilty < row + SHADOW_BYTES_PER_ROW);
}

static int shadow_pointer_offset(const void *row, const void *shadow)
{
	/* The length of ">ff00ff00ff00ff00: " is
	 *    3 + (BITS_PER_LONG/8)*2 chars.
	 */
	return 3 + (BITS_PER_LONG/8)*2 + (shadow - row)*2 +
		(shadow - row) / SHADOW_BYTES_PER_BLOCK + 1;
}

static void print_shadow_for_address(const void *addr)
{
	int i;
	const void *shadow = kasan_mem_to_shadow(addr);
	const void *shadow_row;

	shadow_row = (void *)round_down((unsigned long)shadow,
					SHADOW_BYTES_PER_ROW)
		- SHADOW_ROWS_AROUND_ADDR * SHADOW_BYTES_PER_ROW;

	pr_err("Memory state around the buggy address:\n");

	for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_ROWS_AROUND_ADDR; i++) {
		const void *kaddr = kasan_shadow_to_mem(shadow_row);
		char buffer[4 + (BITS_PER_LONG/8)*2];
		char shadow_buf[SHADOW_BYTES_PER_ROW];

		snprintf(buffer, sizeof(buffer),
			(i == 0) ? ">%p: " : " %p: ", kaddr);
		/*
		 * We should not pass a shadow pointer to generic
		 * function, because generic functions may try to
		 * access kasan mapping for the passed address.
		 */
		memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW);
		print_hex_dump(KERN_ERR, buffer,
			DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1,
			shadow_buf, SHADOW_BYTES_PER_ROW, 0);

		if (row_is_guilty(shadow_row, shadow))
			pr_err("%*c\n",
				shadow_pointer_offset(shadow_row, shadow),
				'^');

		shadow_row += SHADOW_BYTES_PER_ROW;
	}
}

static DEFINE_SPINLOCK(report_lock);

static void kasan_report_error(struct kasan_access_info *info)
{
	unsigned long flags;
	const char *bug_type;

	/*
	 * Make sure we don't end up in loop.
	 */
	kasan_disable_current();
	spin_lock_irqsave(&report_lock, flags);
	pr_err("==================================================================\n");
	if (info->access_addr <
			kasan_shadow_to_mem((void *)KASAN_SHADOW_START)) {
		if ((unsigned long)info->access_addr < PAGE_SIZE)
			bug_type = "null-ptr-deref";
		else if ((unsigned long)info->access_addr < TASK_SIZE)
			bug_type = "user-memory-access";
		else
			bug_type = "wild-memory-access";
		pr_err("BUG: KASAN: %s on address %p\n",
			bug_type, info->access_addr);
		pr_err("%s of size %zu by task %s/%d\n",
			info->is_write ? "Write" : "Read",
			info->access_size, current->comm,
			task_pid_nr(current));
		dump_stack();
	} else {
		print_error_description(info);
		print_address_description(info);
		print_shadow_for_address(info->first_bad_addr);
	}
	pr_err("==================================================================\n");
	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
	spin_unlock_irqrestore(&report_lock, flags);
	kasan_enable_current();
}

void kasan_report(unsigned long addr, size_t size,
		bool is_write, unsigned long ip)
{
	struct kasan_access_info info;

	if (likely(!kasan_report_enabled()))
		return;

	info.access_addr = (void *)addr;
	info.access_size = size;
	info.is_write = is_write;
	info.ip = ip;

	kasan_report_error(&info);
}


#define DEFINE_ASAN_REPORT_LOAD(size)                     \
void __asan_report_load##size##_noabort(unsigned long addr) \
{                                                         \
	kasan_report(addr, size, false, _RET_IP_);	  \
}                                                         \
EXPORT_SYMBOL(__asan_report_load##size##_noabort)

#define DEFINE_ASAN_REPORT_STORE(size)                     \
void __asan_report_store##size##_noabort(unsigned long addr) \
{                                                          \
	kasan_report(addr, size, true, _RET_IP_);	   \
}                                                          \
EXPORT_SYMBOL(__asan_report_store##size##_noabort)

DEFINE_ASAN_REPORT_LOAD(1);
DEFINE_ASAN_REPORT_LOAD(2);
DEFINE_ASAN_REPORT_LOAD(4);
DEFINE_ASAN_REPORT_LOAD(8);
DEFINE_ASAN_REPORT_LOAD(16);
DEFINE_ASAN_REPORT_STORE(1);
DEFINE_ASAN_REPORT_STORE(2);
DEFINE_ASAN_REPORT_STORE(4);
DEFINE_ASAN_REPORT_STORE(8);
DEFINE_ASAN_REPORT_STORE(16);

void __asan_report_load_n_noabort(unsigned long addr, size_t size)
{
	kasan_report(addr, size, false, _RET_IP_);
}
EXPORT_SYMBOL(__asan_report_load_n_noabort);

void __asan_report_store_n_noabort(unsigned long addr, size_t size)
{
	kasan_report(addr, size, true, _RET_IP_);
}
EXPORT_SYMBOL(__asan_report_store_n_noabort);
Commit	Line	Data
0b24becc AR	1	/*
	2	* This file contains error reporting code.
	3	*
	4	* Copyright (c) 2014 Samsung Electronics Co., Ltd.
2baf9e89	5	* Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
0b24becc	6	*
5d0926ef	7	* Some code borrowed from https://github.com/xairy/kasan-prototype by
0b24becc AR	8	* Andrey Konovalov <adech.fo@gmail.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/mm.h>
	18	#include <linux/printk.h>
	19	#include <linux/sched.h>
	20	#include <linux/slab.h>
cd11016e	21	#include <linux/stackdepot.h>
0b24becc AR	22	#include <linux/stacktrace.h>
	23	#include <linux/string.h>
	24	#include <linux/types.h>
	25	#include <linux/kasan.h>
527f215b	26	#include <linux/module.h>
0b24becc	27
bebf56a1 AR	28	#include <asm/sections.h>
bebf56a1 AR	29
0b24becc	30	#include "kasan.h"
0316bec2	31	#include "../slab.h"
0b24becc AR	32
	33	/* Shadow layout customization. */
	34	#define SHADOW_BYTES_PER_BLOCK 1
	35	#define SHADOW_BLOCKS_PER_ROW 16
	36	#define SHADOW_BYTES_PER_ROW (SHADOW_BLOCKS_PER_ROW * SHADOW_BYTES_PER_BLOCK)
	37	#define SHADOW_ROWS_AROUND_ADDR 2
	38
	39	static const void find_first_bad_addr(const void addr, size_t size)
	40	{
	41	u8 shadow_val = (u8 )kasan_mem_to_shadow(addr);
	42	const void *first_bad_addr = addr;
	43
	44	while (!shadow_val && first_bad_addr < addr + size) {
	45	first_bad_addr += KASAN_SHADOW_SCALE_SIZE;
	46	shadow_val = (u8 )kasan_mem_to_shadow(first_bad_addr);
	47	}
	48	return first_bad_addr;
	49	}
	50
	51	static void print_error_description(struct kasan_access_info *info)
	52	{
0952d87f	53	const char *bug_type = "unknown-crash";
cdf6a273	54	u8 *shadow_addr;
0b24becc AR	55
	56	info->first_bad_addr = find_first_bad_addr(info->access_addr,
	57	info->access_size);
	58
cdf6a273	59	shadow_addr = (u8 *)kasan_mem_to_shadow(info->first_bad_addr);
0b24becc	60
cdf6a273 AK	61	/*
	62	* If shadow byte value is in [0, KASAN_SHADOW_SCALE_SIZE) we can look
	63	* at the next shadow byte to determine the type of the bad access.
	64	*/
	65	if (shadow_addr > 0 && shadow_addr <= KASAN_SHADOW_SCALE_SIZE - 1)
	66	shadow_addr++;
	67
	68	switch (*shadow_addr) {
0952d87f	69	case 0 ... KASAN_SHADOW_SCALE_SIZE - 1:
cdf6a273 AK	70	/*
	71	* In theory it's still possible to see these shadow values
	72	* due to a data race in the kernel code.
	73	*/
0952d87f	74	bug_type = "out-of-bounds";
b8c73fc2	75	break;
0316bec2 AR	76	case KASAN_PAGE_REDZONE:
0316bec2 AR	77	case KASAN_KMALLOC_REDZONE:
0952d87f AK	78	bug_type = "slab-out-of-bounds";
0952d87f AK	79	break;
bebf56a1	80	case KASAN_GLOBAL_REDZONE:
0952d87f	81	bug_type = "global-out-of-bounds";
0b24becc	82	break;
c420f167 AR	83	case KASAN_STACK_LEFT:
	84	case KASAN_STACK_MID:
	85	case KASAN_STACK_RIGHT:
	86	case KASAN_STACK_PARTIAL:
0952d87f AK	87	bug_type = "stack-out-of-bounds";
	88	break;
	89	case KASAN_FREE_PAGE:
	90	case KASAN_KMALLOC_FREE:
	91	bug_type = "use-after-free";
c420f167	92	break;
0b24becc AR	93	}
0b24becc AR	94
25add7ec	95	pr_err("BUG: KASAN: %s in %pS at addr %p\n",
0b24becc AR	96	bug_type, (void *)info->ip,
	97	info->access_addr);
	98	pr_err("%s of size %zu by task %s/%d\n",
	99	info->is_write ? "Write" : "Read",
	100	info->access_size, current->comm, task_pid_nr(current));
	101	}
	102
bebf56a1 AR	103	static inline bool kernel_or_module_addr(const void *addr)
bebf56a1 AR	104	{
527f215b AK	105	if (addr >= (void )_stext && addr < (void )_end)
	106	return true;
	107	if (is_module_address((unsigned long)addr))
	108	return true;
	109	return false;
bebf56a1 AR	110	}
	111
	112	static inline bool init_task_stack_addr(const void *addr)
	113	{
	114	return addr >= (void *)&init_thread_union.stack &&
	115	(addr <= (void *)&init_thread_union.stack +
	116	sizeof(init_thread_union.stack));
	117	}
	118
7ed2f9e6 AP	119	#ifdef CONFIG_SLAB
	120	static void print_track(struct kasan_track *track)
	121	{
cd11016e AP	122	pr_err("PID = %u\n", track->pid);
	123	if (track->stack) {
	124	struct stack_trace trace;
	125
	126	depot_fetch_stack(track->stack, &trace);
	127	print_stack_trace(&trace, 0);
	128	} else {
	129	pr_err("(stack is not available)\n");
	130	}
7ed2f9e6 AP	131	}
	132
	133	static void object_err(struct kmem_cache cache, struct page page,
	134	void object, char unused_reason)
	135	{
	136	struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
	137	struct kasan_free_meta *free_info;
	138
	139	dump_stack();
	140	pr_err("Object at %p, in cache %s\n", object, cache->name);
	141	if (!(cache->flags & SLAB_KASAN))
	142	return;
	143	switch (alloc_info->state) {
	144	case KASAN_STATE_INIT:
	145	pr_err("Object not allocated yet\n");
	146	break;
	147	case KASAN_STATE_ALLOC:
	148	pr_err("Object allocated with size %u bytes.\n",
	149	alloc_info->alloc_size);
	150	pr_err("Allocation:\n");
	151	print_track(&alloc_info->track);
	152	break;
	153	case KASAN_STATE_FREE:
55834c59	154	case KASAN_STATE_QUARANTINE:
7ed2f9e6 AP	155	pr_err("Object freed, allocated with size %u bytes\n",
	156	alloc_info->alloc_size);
	157	free_info = get_free_info(cache, object);
	158	pr_err("Allocation:\n");
	159	print_track(&alloc_info->track);
	160	pr_err("Deallocation:\n");
	161	print_track(&free_info->track);
	162	break;
	163	}
	164	}
	165	#endif
	166
0b24becc AR	167	static void print_address_description(struct kasan_access_info *info)
0b24becc AR	168	{
b8c73fc2 AR	169	const void *addr = info->access_addr;
	170
	171	if ((addr >= (void *)PAGE_OFFSET) &&
	172	(addr < high_memory)) {
	173	struct page *page = virt_to_head_page(addr);
0316bec2 AR	174
	175	if (PageSlab(page)) {
	176	void *object;
	177	struct kmem_cache *cache = page->slab_cache;
7ed2f9e6 AP	178	object = nearest_obj(cache, page,
7ed2f9e6 AP	179	(void *)info->access_addr);
0316bec2	180	object_err(cache, page, object,
7ed2f9e6	181	"kasan: bad access detected");
0316bec2 AR	182	return;
0316bec2 AR	183	}
b8c73fc2 AR	184	dump_page(page, "kasan: bad access detected");
	185	}
	186
bebf56a1 AR	187	if (kernel_or_module_addr(addr)) {
	188	if (!init_task_stack_addr(addr))
	189	pr_err("Address belongs to variable %pS\n", addr);
	190	}
0b24becc AR	191	dump_stack();
	192	}
	193
	194	static bool row_is_guilty(const void row, const void guilty)
	195	{
	196	return (row <= guilty) && (guilty < row + SHADOW_BYTES_PER_ROW);
	197	}
	198
	199	static int shadow_pointer_offset(const void row, const void shadow)
	200	{
	201	/* The length of ">ff00ff00ff00ff00: " is
	202	* 3 + (BITS_PER_LONG/8)*2 chars.
	203	*/
	204	return 3 + (BITS_PER_LONG/8)2 + (shadow - row)2 +
	205	(shadow - row) / SHADOW_BYTES_PER_BLOCK + 1;
	206	}
	207
	208	static void print_shadow_for_address(const void *addr)
	209	{
	210	int i;
	211	const void *shadow = kasan_mem_to_shadow(addr);
	212	const void *shadow_row;
	213
	214	shadow_row = (void *)round_down((unsigned long)shadow,
	215	SHADOW_BYTES_PER_ROW)
	216	- SHADOW_ROWS_AROUND_ADDR * SHADOW_BYTES_PER_ROW;
	217
	218	pr_err("Memory state around the buggy address:\n");
	219
	220	for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_ROWS_AROUND_ADDR; i++) {
	221	const void *kaddr = kasan_shadow_to_mem(shadow_row);
	222	char buffer[4 + (BITS_PER_LONG/8)*2];
f2377d4e	223	char shadow_buf[SHADOW_BYTES_PER_ROW];
0b24becc AR	224
	225	snprintf(buffer, sizeof(buffer),
	226	(i == 0) ? ">%p: " : " %p: ", kaddr);
f2377d4e AK	227	/*
	228	* We should not pass a shadow pointer to generic
	229	* function, because generic functions may try to
	230	* access kasan mapping for the passed address.
	231	*/
f2377d4e	232	memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW);
0b24becc AR	233	print_hex_dump(KERN_ERR, buffer,
0b24becc AR	234	DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1,
f2377d4e	235	shadow_buf, SHADOW_BYTES_PER_ROW, 0);
0b24becc AR	236
	237	if (row_is_guilty(shadow_row, shadow))
	238	pr_err("%*c\n",
	239	shadow_pointer_offset(shadow_row, shadow),
	240	'^');
	241
	242	shadow_row += SHADOW_BYTES_PER_ROW;
	243	}
	244	}
	245
	246	static DEFINE_SPINLOCK(report_lock);
	247
e9121076	248	static void kasan_report_error(struct kasan_access_info *info)
0b24becc AR	249	{
0b24becc AR	250	unsigned long flags;
e9121076	251	const char *bug_type;
0b24becc	252
fc5aeeaf AK	253	/*
	254	* Make sure we don't end up in loop.
	255	*/
	256	kasan_disable_current();
0b24becc	257	spin_lock_irqsave(&report_lock, flags);
756a025f	258	pr_err("==================================================================\n");
e9121076 AK	259	if (info->access_addr <
	260	kasan_shadow_to_mem((void *)KASAN_SHADOW_START)) {
	261	if ((unsigned long)info->access_addr < PAGE_SIZE)
	262	bug_type = "null-ptr-deref";
	263	else if ((unsigned long)info->access_addr < TASK_SIZE)
	264	bug_type = "user-memory-access";
	265	else
	266	bug_type = "wild-memory-access";
25add7ec	267	pr_err("BUG: KASAN: %s on address %p\n",
e9121076 AK	268	bug_type, info->access_addr);
	269	pr_err("%s of size %zu by task %s/%d\n",
	270	info->is_write ? "Write" : "Read",
	271	info->access_size, current->comm,
	272	task_pid_nr(current));
	273	dump_stack();
	274	} else {
	275	print_error_description(info);
	276	print_address_description(info);
	277	print_shadow_for_address(info->first_bad_addr);
	278	}
756a025f	279	pr_err("==================================================================\n");
eb06f43f	280	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
0b24becc	281	spin_unlock_irqrestore(&report_lock, flags);
fc5aeeaf	282	kasan_enable_current();
0b24becc AR	283	}
	284
	285	void kasan_report(unsigned long addr, size_t size,
	286	bool is_write, unsigned long ip)
	287	{
	288	struct kasan_access_info info;
	289
0ba8663c	290	if (likely(!kasan_report_enabled()))
0b24becc AR	291	return;
	292
	293	info.access_addr = (void *)addr;
	294	info.access_size = size;
	295	info.is_write = is_write;
	296	info.ip = ip;
e9121076	297
0b24becc AR	298	kasan_report_error(&info);
	299	}
	300
	301
	302	#define DEFINE_ASAN_REPORT_LOAD(size) \
	303	void __asan_report_load##size##_noabort(unsigned long addr) \
	304	{ \
	305	kasan_report(addr, size, false, _RET_IP_); \
	306	} \
	307	EXPORT_SYMBOL(__asan_report_load##size##_noabort)
	308
	309	#define DEFINE_ASAN_REPORT_STORE(size) \
	310	void __asan_report_store##size##_noabort(unsigned long addr) \
	311	{ \
	312	kasan_report(addr, size, true, _RET_IP_); \
	313	} \
	314	EXPORT_SYMBOL(__asan_report_store##size##_noabort)
	315
	316	DEFINE_ASAN_REPORT_LOAD(1);
	317	DEFINE_ASAN_REPORT_LOAD(2);
	318	DEFINE_ASAN_REPORT_LOAD(4);
	319	DEFINE_ASAN_REPORT_LOAD(8);
	320	DEFINE_ASAN_REPORT_LOAD(16);
	321	DEFINE_ASAN_REPORT_STORE(1);
	322	DEFINE_ASAN_REPORT_STORE(2);
	323	DEFINE_ASAN_REPORT_STORE(4);
	324	DEFINE_ASAN_REPORT_STORE(8);
	325	DEFINE_ASAN_REPORT_STORE(16);
	326
	327	void __asan_report_load_n_noabort(unsigned long addr, size_t size)
	328	{
	329	kasan_report(addr, size, false, _RET_IP_);
	330	}
	331	EXPORT_SYMBOL(__asan_report_load_n_noabort);
	332
	333	void __asan_report_store_n_noabort(unsigned long addr, size_t size)
	334	{
	335	kasan_report(addr, size, true, _RET_IP_);
	336	}
	337	EXPORT_SYMBOL(__asan_report_store_n_noabort);