[linux.git] / lib / ubsan.c

/*
 * UBSAN error reporting functions
 *
 * 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.
 *
 */

#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/uaccess.h>

#include "ubsan.h"

const char *type_check_kinds[] = {
	"load of",
	"store to",
	"reference binding to",
	"member access within",
	"member call on",
	"constructor call on",
	"downcast of",
	"downcast of"
};

#define REPORTED_BIT 31

#if (BITS_PER_LONG == 64) && defined(__BIG_ENDIAN)
#define COLUMN_MASK (~(1U << REPORTED_BIT))
#define LINE_MASK   (~0U)
#else
#define COLUMN_MASK   (~0U)
#define LINE_MASK (~(1U << REPORTED_BIT))
#endif

#define VALUE_LENGTH 40

static bool was_reported(struct source_location *location)
{
	return test_and_set_bit(REPORTED_BIT, &location->reported);
}

static void print_source_location(const char *prefix,
				struct source_location *loc)
{
	pr_err("%s %s:%d:%d\n", prefix, loc->file_name,
		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
}

static bool suppress_report(struct source_location *loc)
{
	return current->in_ubsan || was_reported(loc);
}

static bool type_is_int(struct type_descriptor *type)
{
	return type->type_kind == type_kind_int;
}

static bool type_is_signed(struct type_descriptor *type)
{
	WARN_ON(!type_is_int(type));
	return  type->type_info & 1;
}

static unsigned type_bit_width(struct type_descriptor *type)
{
	return 1 << (type->type_info >> 1);
}

static bool is_inline_int(struct type_descriptor *type)
{
	unsigned inline_bits = sizeof(unsigned long)*8;
	unsigned bits = type_bit_width(type);

	WARN_ON(!type_is_int(type));

	return bits <= inline_bits;
}

static s_max get_signed_val(struct type_descriptor *type, void *val)
{
	if (is_inline_int(type)) {
		unsigned extra_bits = sizeof(s_max)*8 - type_bit_width(type);
		unsigned long ulong_val = (unsigned long)val;

		return ((s_max)ulong_val) << extra_bits >> extra_bits;
	}

	if (type_bit_width(type) == 64)
		return *(s64 *)val;

	return *(s_max *)val;
}

static bool val_is_negative(struct type_descriptor *type, void *val)
{
	return type_is_signed(type) && get_signed_val(type, val) < 0;
}

static u_max get_unsigned_val(struct type_descriptor *type, void *val)
{
	if (is_inline_int(type))
		return (unsigned long)val;

	if (type_bit_width(type) == 64)
		return *(u64 *)val;

	return *(u_max *)val;
}

static void val_to_string(char *str, size_t size, struct type_descriptor *type,
			void *value)
{
	if (type_is_int(type)) {
		if (type_bit_width(type) == 128) {
#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
			u_max val = get_unsigned_val(type, value);

			scnprintf(str, size, "0x%08x%08x%08x%08x",
				(u32)(val >> 96),
				(u32)(val >> 64),
				(u32)(val >> 32),
				(u32)(val));
#else
			WARN_ON(1);
#endif
		} else if (type_is_signed(type)) {
			scnprintf(str, size, "%lld",
				(s64)get_signed_val(type, value));
		} else {
			scnprintf(str, size, "%llu",
				(u64)get_unsigned_val(type, value));
		}
	}
}

static DEFINE_SPINLOCK(report_lock);

static void ubsan_prologue(struct source_location *location,
			unsigned long *flags)
{
	current->in_ubsan++;
	spin_lock_irqsave(&report_lock, *flags);

	pr_err("========================================"
		"========================================\n");
	print_source_location("UBSAN: Undefined behaviour in", location);
}

static void ubsan_epilogue(unsigned long *flags)
{
	dump_stack();
	pr_err("========================================"
		"========================================\n");
	spin_unlock_irqrestore(&report_lock, *flags);
	current->in_ubsan--;
}

static void handle_overflow(struct overflow_data *data, void *lhs,
			void *rhs, char op)
{

	struct type_descriptor *type = data->type;
	unsigned long flags;
	char lhs_val_str[VALUE_LENGTH];
	char rhs_val_str[VALUE_LENGTH];

	if (suppress_report(&data->location))
		return;

	ubsan_prologue(&data->location, &flags);

	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
	pr_err("%s integer overflow:\n",
		type_is_signed(type) ? "signed" : "unsigned");
	pr_err("%s %c %s cannot be represented in type %s\n",
		lhs_val_str,
		op,
		rhs_val_str,
		type->type_name);

	ubsan_epilogue(&flags);
}

void __ubsan_handle_add_overflow(struct overflow_data *data,
				void *lhs, void *rhs)
{

	handle_overflow(data, lhs, rhs, '+');
}
EXPORT_SYMBOL(__ubsan_handle_add_overflow);

void __ubsan_handle_sub_overflow(struct overflow_data *data,
				void *lhs, void *rhs)
{
	handle_overflow(data, lhs, rhs, '-');
}
EXPORT_SYMBOL(__ubsan_handle_sub_overflow);

void __ubsan_handle_mul_overflow(struct overflow_data *data,
				void *lhs, void *rhs)
{
	handle_overflow(data, lhs, rhs, '*');
}
EXPORT_SYMBOL(__ubsan_handle_mul_overflow);

void __ubsan_handle_negate_overflow(struct overflow_data *data,
				void *old_val)
{
	unsigned long flags;
	char old_val_str[VALUE_LENGTH];

	if (suppress_report(&data->location))
		return;

	ubsan_prologue(&data->location, &flags);

	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);

	pr_err("negation of %s cannot be represented in type %s:\n",
		old_val_str, data->type->type_name);

	ubsan_epilogue(&flags);
}
EXPORT_SYMBOL(__ubsan_handle_negate_overflow);


void __ubsan_handle_divrem_overflow(struct overflow_data *data,
				void *lhs, void *rhs)
{
	unsigned long flags;
	char rhs_val_str[VALUE_LENGTH];

	if (suppress_report(&data->location))
		return;

	ubsan_prologue(&data->location, &flags);

	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);

	if (type_is_signed(data->type) && get_signed_val(data->type, rhs) == -1)
		pr_err("division of %s by -1 cannot be represented in type %s\n",
			rhs_val_str, data->type->type_name);
	else
		pr_err("division by zero\n");

	ubsan_epilogue(&flags);
}
EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);

static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
{
	unsigned long flags;

	if (suppress_report(data->location))
		return;

	ubsan_prologue(data->location, &flags);

	pr_err("%s null pointer of type %s\n",
		type_check_kinds[data->type_check_kind],
		data->type->type_name);

	ubsan_epilogue(&flags);
}

static void handle_misaligned_access(struct type_mismatch_data_common *data,
				unsigned long ptr)
{
	unsigned long flags;

	if (suppress_report(data->location))
		return;

	ubsan_prologue(data->location, &flags);

	pr_err("%s misaligned address %p for type %s\n",
		type_check_kinds[data->type_check_kind],
		(void *)ptr, data->type->type_name);
	pr_err("which requires %ld byte alignment\n", data->alignment);

	ubsan_epilogue(&flags);
}

static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
					unsigned long ptr)
{
	unsigned long flags;

	if (suppress_report(data->location))
		return;

	ubsan_prologue(data->location, &flags);
	pr_err("%s address %p with insufficient space\n",
		type_check_kinds[data->type_check_kind],
		(void *) ptr);
	pr_err("for an object of type %s\n", data->type->type_name);
	ubsan_epilogue(&flags);
}

static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
				unsigned long ptr)
{
	unsigned long flags = user_access_save();

	if (!ptr)
		handle_null_ptr_deref(data);
	else if (data->alignment && !IS_ALIGNED(ptr, data->alignment))
		handle_misaligned_access(data, ptr);
	else
		handle_object_size_mismatch(data, ptr);

	user_access_restore(flags);
}

void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
				void *ptr)
{
	struct type_mismatch_data_common common_data = {
		.location = &data->location,
		.type = data->type,
		.alignment = data->alignment,
		.type_check_kind = data->type_check_kind
	};

	ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch);

void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
				void *ptr)
{

	struct type_mismatch_data_common common_data = {
		.location = &data->location,
		.type = data->type,
		.alignment = 1UL << data->log_alignment,
		.type_check_kind = data->type_check_kind
	};

	ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);

void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
{
	unsigned long flags;
	char index_str[VALUE_LENGTH];

	if (suppress_report(&data->location))
		return;

	ubsan_prologue(&data->location, &flags);

	val_to_string(index_str, sizeof(index_str), data->index_type, index);
	pr_err("index %s is out of range for type %s\n", index_str,
		data->array_type->type_name);
	ubsan_epilogue(&flags);
}
EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);

void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
					void *lhs, void *rhs)
{
	unsigned long flags;
	struct type_descriptor *rhs_type = data->rhs_type;
	struct type_descriptor *lhs_type = data->lhs_type;
	char rhs_str[VALUE_LENGTH];
	char lhs_str[VALUE_LENGTH];

	if (suppress_report(&data->location))
		return;

	ubsan_prologue(&data->location, &flags);

	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);

	if (val_is_negative(rhs_type, rhs))
		pr_err("shift exponent %s is negative\n", rhs_str);

	else if (get_unsigned_val(rhs_type, rhs) >=
		type_bit_width(lhs_type))
		pr_err("shift exponent %s is too large for %u-bit type %s\n",
			rhs_str,
			type_bit_width(lhs_type),
			lhs_type->type_name);
	else if (val_is_negative(lhs_type, lhs))
		pr_err("left shift of negative value %s\n",
			lhs_str);
	else
		pr_err("left shift of %s by %s places cannot be"
			" represented in type %s\n",
			lhs_str, rhs_str,
			lhs_type->type_name);

	ubsan_epilogue(&flags);
}
EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);


void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
{
	unsigned long flags;

	ubsan_prologue(&data->location, &flags);
	pr_err("calling __builtin_unreachable()\n");
	ubsan_epilogue(&flags);
	panic("can't return from __builtin_unreachable()");
}
EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);

void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
				void *val)
{
	unsigned long flags;
	char val_str[VALUE_LENGTH];

	if (suppress_report(&data->location))
		return;

	ubsan_prologue(&data->location, &flags);

	val_to_string(val_str, sizeof(val_str), data->type, val);

	pr_err("load of value %s is not a valid value for type %s\n",
		val_str, data->type->type_name);

	ubsan_epilogue(&flags);
}
EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
Commit	Line	Data
c6d30853 AR	1	/*
	2	* UBSAN error reporting functions
	3	*
	4	* Copyright (c) 2014 Samsung Electronics Co., Ltd.
	5	* Author: Andrey Ryabinin <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/bitops.h>
	14	#include <linux/bug.h>
	15	#include <linux/ctype.h>
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/types.h>
	19	#include <linux/sched.h>
d08965a2	20	#include <linux/uaccess.h>
c6d30853 AR	21
	22	#include "ubsan.h"
	23
	24	const char *type_check_kinds[] = {
	25	"load of",
	26	"store to",
	27	"reference binding to",
	28	"member access within",
	29	"member call on",
	30	"constructor call on",
	31	"downcast of",
	32	"downcast of"
	33	};
	34
	35	#define REPORTED_BIT 31
	36
	37	#if (BITS_PER_LONG == 64) && defined(__BIG_ENDIAN)
	38	#define COLUMN_MASK (~(1U << REPORTED_BIT))
	39	#define LINE_MASK (~0U)
	40	#else
	41	#define COLUMN_MASK (~0U)
	42	#define LINE_MASK (~(1U << REPORTED_BIT))
	43	#endif
	44
	45	#define VALUE_LENGTH 40
	46
	47	static bool was_reported(struct source_location *location)
	48	{
	49	return test_and_set_bit(REPORTED_BIT, &location->reported);
	50	}
	51
	52	static void print_source_location(const char *prefix,
	53	struct source_location *loc)
	54	{
	55	pr_err("%s %s:%d:%d\n", prefix, loc->file_name,
	56	loc->line & LINE_MASK, loc->column & COLUMN_MASK);
	57	}
	58
	59	static bool suppress_report(struct source_location *loc)
	60	{
	61	return current->in_ubsan \|\| was_reported(loc);
	62	}
	63
	64	static bool type_is_int(struct type_descriptor *type)
	65	{
	66	return type->type_kind == type_kind_int;
	67	}
	68
	69	static bool type_is_signed(struct type_descriptor *type)
	70	{
	71	WARN_ON(!type_is_int(type));
	72	return type->type_info & 1;
	73	}
	74
	75	static unsigned type_bit_width(struct type_descriptor *type)
	76	{
	77	return 1 << (type->type_info >> 1);
	78	}
	79
	80	static bool is_inline_int(struct type_descriptor *type)
	81	{
	82	unsigned inline_bits = sizeof(unsigned long)*8;
	83	unsigned bits = type_bit_width(type);
	84
85	WARN_ON(!type_is_int(type));
86
87	return bits <= inline_bits;
88	}
89
f0996bc2	90	static s_max get_signed_val(struct type_descriptor type, void val)
c6d30853 AR	91	{
	92	if (is_inline_int(type)) {
	93	unsigned extra_bits = sizeof(s_max)*8 - type_bit_width(type);
f0996bc2 AR	94	unsigned long ulong_val = (unsigned long)val;
	95
	96	return ((s_max)ulong_val) << extra_bits >> extra_bits;
c6d30853 AR	97	}
	98
	99	if (type_bit_width(type) == 64)
	100	return (s64 )val;
	101
	102	return (s_max )val;
	103	}
	104
f0996bc2	105	static bool val_is_negative(struct type_descriptor type, void val)
c6d30853 AR	106	{
	107	return type_is_signed(type) && get_signed_val(type, val) < 0;
	108	}
	109
f0996bc2	110	static u_max get_unsigned_val(struct type_descriptor type, void val)
c6d30853 AR	111	{
c6d30853 AR	112	if (is_inline_int(type))
f0996bc2	113	return (unsigned long)val;
c6d30853 AR	114
	115	if (type_bit_width(type) == 64)
	116	return (u64 )val;
	117
	118	return (u_max )val;
	119	}
	120
	121	static void val_to_string(char str, size_t size, struct type_descriptor type,
f0996bc2	122	void *value)
c6d30853 AR	123	{
	124	if (type_is_int(type)) {
	125	if (type_bit_width(type) == 128) {
	126	#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
	127	u_max val = get_unsigned_val(type, value);
	128
	129	scnprintf(str, size, "0x%08x%08x%08x%08x",
	130	(u32)(val >> 96),
	131	(u32)(val >> 64),
	132	(u32)(val >> 32),
	133	(u32)(val));
	134	#else
	135	WARN_ON(1);
	136	#endif
	137	} else if (type_is_signed(type)) {
	138	scnprintf(str, size, "%lld",
	139	(s64)get_signed_val(type, value));
	140	} else {
	141	scnprintf(str, size, "%llu",
	142	(u64)get_unsigned_val(type, value));
	143	}
	144	}
	145	}
	146
c6d30853 AR	147	static DEFINE_SPINLOCK(report_lock);
	148
	149	static void ubsan_prologue(struct source_location *location,
	150	unsigned long *flags)
	151	{
	152	current->in_ubsan++;
	153	spin_lock_irqsave(&report_lock, *flags);
	154
	155	pr_err("========================================"
	156	"========================================\n");
	157	print_source_location("UBSAN: Undefined behaviour in", location);
	158	}
	159
	160	static void ubsan_epilogue(unsigned long *flags)
	161	{
	162	dump_stack();
	163	pr_err("========================================"
	164	"========================================\n");
	165	spin_unlock_irqrestore(&report_lock, *flags);
	166	current->in_ubsan--;
	167	}
	168
f0996bc2 AR	169	static void handle_overflow(struct overflow_data data, void lhs,
f0996bc2 AR	170	void *rhs, char op)
c6d30853 AR	171	{
	172
	173	struct type_descriptor *type = data->type;
	174	unsigned long flags;
	175	char lhs_val_str[VALUE_LENGTH];
	176	char rhs_val_str[VALUE_LENGTH];
	177
	178	if (suppress_report(&data->location))
	179	return;
	180
	181	ubsan_prologue(&data->location, &flags);
	182
	183	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
	184	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
	185	pr_err("%s integer overflow:\n",
	186	type_is_signed(type) ? "signed" : "unsigned");
	187	pr_err("%s %c %s cannot be represented in type %s\n",
	188	lhs_val_str,
	189	op,
	190	rhs_val_str,
	191	type->type_name);
	192
	193	ubsan_epilogue(&flags);
	194	}
	195
	196	void __ubsan_handle_add_overflow(struct overflow_data *data,
f0996bc2	197	void lhs, void rhs)
c6d30853 AR	198	{
	199
	200	handle_overflow(data, lhs, rhs, '+');
	201	}
	202	EXPORT_SYMBOL(__ubsan_handle_add_overflow);
	203
	204	void __ubsan_handle_sub_overflow(struct overflow_data *data,
f0996bc2	205	void lhs, void rhs)
c6d30853 AR	206	{
	207	handle_overflow(data, lhs, rhs, '-');
	208	}
	209	EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
	210
	211	void __ubsan_handle_mul_overflow(struct overflow_data *data,
f0996bc2	212	void lhs, void rhs)
c6d30853 AR	213	{
	214	handle_overflow(data, lhs, rhs, '*');
	215	}
	216	EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
	217
	218	void __ubsan_handle_negate_overflow(struct overflow_data *data,
f0996bc2	219	void *old_val)
c6d30853 AR	220	{
	221	unsigned long flags;
	222	char old_val_str[VALUE_LENGTH];
	223
	224	if (suppress_report(&data->location))
	225	return;
	226
	227	ubsan_prologue(&data->location, &flags);
	228
	229	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
	230
	231	pr_err("negation of %s cannot be represented in type %s:\n",
	232	old_val_str, data->type->type_name);
	233
	234	ubsan_epilogue(&flags);
	235	}
	236	EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
	237
	238
	239	void __ubsan_handle_divrem_overflow(struct overflow_data *data,
f0996bc2	240	void lhs, void rhs)
c6d30853 AR	241	{
	242	unsigned long flags;
	243	char rhs_val_str[VALUE_LENGTH];
	244
	245	if (suppress_report(&data->location))
	246	return;
	247
	248	ubsan_prologue(&data->location, &flags);
	249
	250	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
	251
	252	if (type_is_signed(data->type) && get_signed_val(data->type, rhs) == -1)
	253	pr_err("division of %s by -1 cannot be represented in type %s\n",
	254	rhs_val_str, data->type->type_name);
	255	else
	256	pr_err("division by zero\n");
	257
	258	ubsan_epilogue(&flags);
	259	}
	260	EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
	261
42440c1f	262	static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
c6d30853 AR	263	{
	264	unsigned long flags;
	265
42440c1f	266	if (suppress_report(data->location))
c6d30853 AR	267	return;
c6d30853 AR	268
42440c1f	269	ubsan_prologue(data->location, &flags);
c6d30853 AR	270
	271	pr_err("%s null pointer of type %s\n",
	272	type_check_kinds[data->type_check_kind],
	273	data->type->type_name);
	274
	275	ubsan_epilogue(&flags);
	276	}
	277
42440c1f	278	static void handle_misaligned_access(struct type_mismatch_data_common *data,
c6d30853 AR	279	unsigned long ptr)
	280	{
	281	unsigned long flags;
	282
42440c1f	283	if (suppress_report(data->location))
c6d30853 AR	284	return;
c6d30853 AR	285
42440c1f	286	ubsan_prologue(data->location, &flags);
c6d30853 AR	287
	288	pr_err("%s misaligned address %p for type %s\n",
	289	type_check_kinds[data->type_check_kind],
	290	(void *)ptr, data->type->type_name);
	291	pr_err("which requires %ld byte alignment\n", data->alignment);
	292
	293	ubsan_epilogue(&flags);
	294	}
	295
42440c1f	296	static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
c6d30853 AR	297	unsigned long ptr)
	298	{
	299	unsigned long flags;
	300
42440c1f	301	if (suppress_report(data->location))
c6d30853 AR	302	return;
c6d30853 AR	303
42440c1f	304	ubsan_prologue(data->location, &flags);
901d805c	305	pr_err("%s address %p with insufficient space\n",
c6d30853 AR	306	type_check_kinds[data->type_check_kind],
	307	(void *) ptr);
	308	pr_err("for an object of type %s\n", data->type->type_name);
	309	ubsan_epilogue(&flags);
	310	}
	311
42440c1f	312	static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
c6d30853 AR	313	unsigned long ptr)
c6d30853 AR	314	{
d08965a2	315	unsigned long flags = user_access_save();
c6d30853 AR	316
	317	if (!ptr)
	318	handle_null_ptr_deref(data);
	319	else if (data->alignment && !IS_ALIGNED(ptr, data->alignment))
b8fe1120	320	handle_misaligned_access(data, ptr);
c6d30853 AR	321	else
c6d30853 AR	322	handle_object_size_mismatch(data, ptr);
d08965a2 PZ	323
d08965a2 PZ	324	user_access_restore(flags);
c6d30853	325	}
42440c1f AR	326
42440c1f AR	327	void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
f0996bc2	328	void *ptr)
42440c1f AR	329	{
	330	struct type_mismatch_data_common common_data = {
	331	.location = &data->location,
	332	.type = data->type,
	333	.alignment = data->alignment,
	334	.type_check_kind = data->type_check_kind
	335	};
	336
f0996bc2	337	ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
42440c1f	338	}
c6d30853 AR	339	EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
c6d30853 AR	340
42440c1f	341	void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
f0996bc2	342	void *ptr)
42440c1f AR	343	{
	344
	345	struct type_mismatch_data_common common_data = {
	346	.location = &data->location,
	347	.type = data->type,
	348	.alignment = 1UL << data->log_alignment,
	349	.type_check_kind = data->type_check_kind
	350	};
	351
f0996bc2	352	ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
42440c1f AR	353	}
	354	EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
	355
f0996bc2	356	void __ubsan_handle_out_of_bounds(struct out_of_bounds_data data, void index)
c6d30853 AR	357	{
	358	unsigned long flags;
	359	char index_str[VALUE_LENGTH];
	360
	361	if (suppress_report(&data->location))
	362	return;
	363
	364	ubsan_prologue(&data->location, &flags);
	365
	366	val_to_string(index_str, sizeof(index_str), data->index_type, index);
	367	pr_err("index %s is out of range for type %s\n", index_str,
	368	data->array_type->type_name);
	369	ubsan_epilogue(&flags);
	370	}
	371	EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
	372
	373	void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
f0996bc2	374	void lhs, void rhs)
c6d30853 AR	375	{
	376	unsigned long flags;
	377	struct type_descriptor *rhs_type = data->rhs_type;
	378	struct type_descriptor *lhs_type = data->lhs_type;
	379	char rhs_str[VALUE_LENGTH];
	380	char lhs_str[VALUE_LENGTH];
	381
	382	if (suppress_report(&data->location))
	383	return;
	384
	385	ubsan_prologue(&data->location, &flags);
	386
	387	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
	388	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
	389
	390	if (val_is_negative(rhs_type, rhs))
	391	pr_err("shift exponent %s is negative\n", rhs_str);
	392
	393	else if (get_unsigned_val(rhs_type, rhs) >=
	394	type_bit_width(lhs_type))
	395	pr_err("shift exponent %s is too large for %u-bit type %s\n",
	396	rhs_str,
	397	type_bit_width(lhs_type),
	398	lhs_type->type_name);
	399	else if (val_is_negative(lhs_type, lhs))
	400	pr_err("left shift of negative value %s\n",
	401	lhs_str);
	402	else
	403	pr_err("left shift of %s by %s places cannot be"
	404	" represented in type %s\n",
	405	lhs_str, rhs_str,
	406	lhs_type->type_name);
	407
	408	ubsan_epilogue(&flags);
	409	}
	410	EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
	411
	412
1c23b410	413	void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
c6d30853 AR	414	{
	415	unsigned long flags;
	416
	417	ubsan_prologue(&data->location, &flags);
	418	pr_err("calling __builtin_unreachable()\n");
	419	ubsan_epilogue(&flags);
	420	panic("can't return from __builtin_unreachable()");
	421	}
	422	EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
	423
	424	void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
f0996bc2	425	void *val)
c6d30853 AR	426	{
	427	unsigned long flags;
	428	char val_str[VALUE_LENGTH];
	429
	430	if (suppress_report(&data->location))
	431	return;
	432
	433	ubsan_prologue(&data->location, &flags);
	434
	435	val_to_string(val_str, sizeof(val_str), data->type, val);
	436
	437	pr_err("load of value %s is not a valid value for type %s\n",
	438	val_str, data->type->type_name);
	439
	440	ubsan_epilogue(&flags);
	441	}
	442	EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);