[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 "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, unsigned long val)
{
	if (is_inline_int(type)) {
		unsigned extra_bits = sizeof(s_max)*8 - type_bit_width(type);
		return ((s_max)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, unsigned long val)
{
	return type_is_signed(type) && get_signed_val(type, val) < 0;
}

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

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

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

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

void __ubsan_handle_negate_overflow(struct overflow_data *data,
				unsigned long 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,
				unsigned long lhs,
				unsigned long 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)
{

	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);
}

void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
				unsigned long 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, ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch);

void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
				unsigned long 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, ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);

void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
					unsigned long bound)
{
	unsigned long flags;
	char bound_str[VALUE_LENGTH];

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

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

	val_to_string(bound_str, sizeof(bound_str), data->type, bound);
	pr_err("variable length array bound value %s <= 0\n", bound_str);

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

void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data,
				unsigned long 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,
					unsigned long lhs, unsigned long 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 __noreturn
__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,
				unsigned long 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>
	20
	21	#include "ubsan.h"
	22
	23	const char *type_check_kinds[] = {
	24	"load of",
	25	"store to",
	26	"reference binding to",
	27	"member access within",
	28	"member call on",
	29	"constructor call on",
	30	"downcast of",
	31	"downcast of"
	32	};
	33
	34	#define REPORTED_BIT 31
	35
	36	#if (BITS_PER_LONG == 64) && defined(__BIG_ENDIAN)
	37	#define COLUMN_MASK (~(1U << REPORTED_BIT))
	38	#define LINE_MASK (~0U)
	39	#else
	40	#define COLUMN_MASK (~0U)
	41	#define LINE_MASK (~(1U << REPORTED_BIT))
	42	#endif
	43
	44	#define VALUE_LENGTH 40
	45
	46	static bool was_reported(struct source_location *location)
	47	{
	48	return test_and_set_bit(REPORTED_BIT, &location->reported);
	49	}
	50
	51	static void print_source_location(const char *prefix,
	52	struct source_location *loc)
	53	{
	54	pr_err("%s %s:%d:%d\n", prefix, loc->file_name,
	55	loc->line & LINE_MASK, loc->column & COLUMN_MASK);
	56	}
	57
	58	static bool suppress_report(struct source_location *loc)
	59	{
	60	return current->in_ubsan \|\| was_reported(loc);
	61	}
	62
	63	static bool type_is_int(struct type_descriptor *type)
	64	{
65	return type->type_kind == type_kind_int;
66	}
67
68	static bool type_is_signed(struct type_descriptor *type)
69	{
70	WARN_ON(!type_is_int(type));
71	return type->type_info & 1;
72	}
73
74	static unsigned type_bit_width(struct type_descriptor *type)
75	{
76	return 1 << (type->type_info >> 1);
77	}
78
79	static bool is_inline_int(struct type_descriptor *type)
80	{
81	unsigned inline_bits = sizeof(unsigned long)*8;
82	unsigned bits = type_bit_width(type);
83
84	WARN_ON(!type_is_int(type));
85
86	return bits <= inline_bits;
87	}
88
89	static s_max get_signed_val(struct type_descriptor *type, unsigned long val)
90	{
91	if (is_inline_int(type)) {
92	unsigned extra_bits = sizeof(s_max)*8 - type_bit_width(type);
93	return ((s_max)val) << extra_bits >> extra_bits;
94	}
95
96	if (type_bit_width(type) == 64)
97	return (s64 )val;
98
99	return (s_max )val;
100	}
101
102	static bool val_is_negative(struct type_descriptor *type, unsigned long val)
103	{
104	return type_is_signed(type) && get_signed_val(type, val) < 0;
105	}
106
107	static u_max get_unsigned_val(struct type_descriptor *type, unsigned long val)
108	{
109	if (is_inline_int(type))
110	return val;
111
112	if (type_bit_width(type) == 64)
113	return (u64 )val;
114
115	return (u_max )val;
116	}
117
118	static void val_to_string(char str, size_t size, struct type_descriptor type,
119	unsigned long value)
120	{
121	if (type_is_int(type)) {
122	if (type_bit_width(type) == 128) {
123	#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
124	u_max val = get_unsigned_val(type, value);
125
126	scnprintf(str, size, "0x%08x%08x%08x%08x",
127	(u32)(val >> 96),
128	(u32)(val >> 64),
129	(u32)(val >> 32),
130	(u32)(val));
131	#else
132	WARN_ON(1);
133	#endif
134	} else if (type_is_signed(type)) {
135	scnprintf(str, size, "%lld",
136	(s64)get_signed_val(type, value));
137	} else {
138	scnprintf(str, size, "%llu",
139	(u64)get_unsigned_val(type, value));
140	}
141	}
142	}
143
c6d30853 AR	144	static DEFINE_SPINLOCK(report_lock);
	145
	146	static void ubsan_prologue(struct source_location *location,
	147	unsigned long *flags)
	148	{
	149	current->in_ubsan++;
	150	spin_lock_irqsave(&report_lock, *flags);
	151
	152	pr_err("========================================"
	153	"========================================\n");
	154	print_source_location("UBSAN: Undefined behaviour in", location);
	155	}
	156
	157	static void ubsan_epilogue(unsigned long *flags)
	158	{
	159	dump_stack();
	160	pr_err("========================================"
	161	"========================================\n");
	162	spin_unlock_irqrestore(&report_lock, *flags);
	163	current->in_ubsan--;
	164	}
	165
	166	static void handle_overflow(struct overflow_data *data, unsigned long lhs,
	167	unsigned long rhs, char op)
	168	{
	169
	170	struct type_descriptor *type = data->type;
	171	unsigned long flags;
	172	char lhs_val_str[VALUE_LENGTH];
	173	char rhs_val_str[VALUE_LENGTH];
	174
	175	if (suppress_report(&data->location))
	176	return;
	177
	178	ubsan_prologue(&data->location, &flags);
	179
	180	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
	181	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
	182	pr_err("%s integer overflow:\n",
	183	type_is_signed(type) ? "signed" : "unsigned");
	184	pr_err("%s %c %s cannot be represented in type %s\n",
	185	lhs_val_str,
	186	op,
	187	rhs_val_str,
	188	type->type_name);
	189
	190	ubsan_epilogue(&flags);
	191	}
	192
	193	void __ubsan_handle_add_overflow(struct overflow_data *data,
	194	unsigned long lhs,
	195	unsigned long rhs)
	196	{
	197
	198	handle_overflow(data, lhs, rhs, '+');
	199	}
	200	EXPORT_SYMBOL(__ubsan_handle_add_overflow);
	201
	202	void __ubsan_handle_sub_overflow(struct overflow_data *data,
	203	unsigned long lhs,
	204	unsigned long rhs)
	205	{
	206	handle_overflow(data, lhs, rhs, '-');
	207	}
208	EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
209
210	void __ubsan_handle_mul_overflow(struct overflow_data *data,
211	unsigned long lhs,
212	unsigned long rhs)
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,
219	unsigned long old_val)
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,
240	unsigned long lhs,
241	unsigned long rhs)
242	{
243	unsigned long flags;
244	char rhs_val_str[VALUE_LENGTH];
245
246	if (suppress_report(&data->location))
247	return;
248
249	ubsan_prologue(&data->location, &flags);
250
251	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
252
253	if (type_is_signed(data->type) && get_signed_val(data->type, rhs) == -1)
254	pr_err("division of %s by -1 cannot be represented in type %s\n",
255	rhs_val_str, data->type->type_name);
256	else
257	pr_err("division by zero\n");
258
259	ubsan_epilogue(&flags);
260	}
261	EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
262
42440c1f	263	static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
c6d30853 AR	264	{
	265	unsigned long flags;
	266
42440c1f	267	if (suppress_report(data->location))
c6d30853 AR	268	return;
c6d30853 AR	269
42440c1f	270	ubsan_prologue(data->location, &flags);
c6d30853 AR	271
	272	pr_err("%s null pointer of type %s\n",
	273	type_check_kinds[data->type_check_kind],
	274	data->type->type_name);
	275
	276	ubsan_epilogue(&flags);
	277	}
	278
42440c1f	279	static void handle_misaligned_access(struct type_mismatch_data_common *data,
c6d30853 AR	280	unsigned long ptr)
	281	{
	282	unsigned long flags;
	283
42440c1f	284	if (suppress_report(data->location))
c6d30853 AR	285	return;
c6d30853 AR	286
42440c1f	287	ubsan_prologue(data->location, &flags);
c6d30853 AR	288
	289	pr_err("%s misaligned address %p for type %s\n",
	290	type_check_kinds[data->type_check_kind],
	291	(void *)ptr, data->type->type_name);
	292	pr_err("which requires %ld byte alignment\n", data->alignment);
	293
	294	ubsan_epilogue(&flags);
	295	}
	296
42440c1f	297	static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
c6d30853 AR	298	unsigned long ptr)
	299	{
	300	unsigned long flags;
	301
42440c1f	302	if (suppress_report(data->location))
c6d30853 AR	303	return;
c6d30853 AR	304
42440c1f	305	ubsan_prologue(data->location, &flags);
901d805c	306	pr_err("%s address %p with insufficient space\n",
c6d30853 AR	307	type_check_kinds[data->type_check_kind],
	308	(void *) ptr);
	309	pr_err("for an object of type %s\n", data->type->type_name);
	310	ubsan_epilogue(&flags);
	311	}
	312
42440c1f	313	static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
c6d30853 AR	314	unsigned long ptr)
	315	{
	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
	322	handle_object_size_mismatch(data, ptr);
	323	}
42440c1f AR	324
	325	void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
	326	unsigned long ptr)
	327	{
	328	struct type_mismatch_data_common common_data = {
	329	.location = &data->location,
	330	.type = data->type,
	331	.alignment = data->alignment,
	332	.type_check_kind = data->type_check_kind
	333	};
	334
	335	ubsan_type_mismatch_common(&common_data, ptr);
	336	}
c6d30853 AR	337	EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
c6d30853 AR	338
42440c1f AR	339	void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
	340	unsigned long ptr)
	341	{
	342
	343	struct type_mismatch_data_common common_data = {
	344	.location = &data->location,
	345	.type = data->type,
	346	.alignment = 1UL << data->log_alignment,
	347	.type_check_kind = data->type_check_kind
	348	};
	349
	350	ubsan_type_mismatch_common(&common_data, ptr);
	351	}
	352	EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
	353
c6d30853 AR	354	void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
	355	unsigned long bound)
	356	{
	357	unsigned long flags;
	358	char bound_str[VALUE_LENGTH];
	359
	360	if (suppress_report(&data->location))
	361	return;
	362
	363	ubsan_prologue(&data->location, &flags);
	364
	365	val_to_string(bound_str, sizeof(bound_str), data->type, bound);
	366	pr_err("variable length array bound value %s <= 0\n", bound_str);
	367
	368	ubsan_epilogue(&flags);
	369	}
	370	EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);
	371
	372	void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data,
	373	unsigned long index)
	374	{
	375	unsigned long flags;
	376	char index_str[VALUE_LENGTH];
	377
	378	if (suppress_report(&data->location))
	379	return;
	380
	381	ubsan_prologue(&data->location, &flags);
	382
	383	val_to_string(index_str, sizeof(index_str), data->index_type, index);
	384	pr_err("index %s is out of range for type %s\n", index_str,
	385	data->array_type->type_name);
	386	ubsan_epilogue(&flags);
	387	}
	388	EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
	389
	390	void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
	391	unsigned long lhs, unsigned long rhs)
	392	{
	393	unsigned long flags;
	394	struct type_descriptor *rhs_type = data->rhs_type;
	395	struct type_descriptor *lhs_type = data->lhs_type;
	396	char rhs_str[VALUE_LENGTH];
	397	char lhs_str[VALUE_LENGTH];
	398
	399	if (suppress_report(&data->location))
	400	return;
	401
	402	ubsan_prologue(&data->location, &flags);
	403
	404	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
	405	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
	406
	407	if (val_is_negative(rhs_type, rhs))
	408	pr_err("shift exponent %s is negative\n", rhs_str);
	409
	410	else if (get_unsigned_val(rhs_type, rhs) >=
	411	type_bit_width(lhs_type))
	412	pr_err("shift exponent %s is too large for %u-bit type %s\n",
	413	rhs_str,
	414	type_bit_width(lhs_type),
	415	lhs_type->type_name);
	416	else if (val_is_negative(lhs_type, lhs))
	417	pr_err("left shift of negative value %s\n",
418	lhs_str);
419	else
420	pr_err("left shift of %s by %s places cannot be"
421	" represented in type %s\n",
422	lhs_str, rhs_str,
423	lhs_type->type_name);
424
425	ubsan_epilogue(&flags);
426	}
427	EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
428
429
430	void __noreturn
431	__ubsan_handle_builtin_unreachable(struct unreachable_data *data)
432	{
433	unsigned long flags;
434
435	ubsan_prologue(&data->location, &flags);
436	pr_err("calling __builtin_unreachable()\n");
437	ubsan_epilogue(&flags);
438	panic("can't return from __builtin_unreachable()");
439	}
440	EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
441
442	void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
443	unsigned long val)
444	{
445	unsigned long flags;
446	char val_str[VALUE_LENGTH];
447
448	if (suppress_report(&data->location))
449	return;
450
451	ubsan_prologue(&data->location, &flags);
452
453	val_to_string(val_str, sizeof(val_str), data->type, val);
454
455	pr_err("load of value %s is not a valid value for type %s\n",
456	val_str, data->type->type_name);
457
458	ubsan_epilogue(&flags);
459	}
460	EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);