[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 bool location_is_valid(struct source_location *loc)
{
	return loc->file_name != NULL;
}

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 *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_missaligned_access(struct type_mismatch_data *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 *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);
}

void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
				unsigned long ptr)
{

	if (!ptr)
		handle_null_ptr_deref(data);
	else if (data->alignment && !IS_ALIGNED(ptr, data->alignment))
		handle_missaligned_access(data, ptr);
	else
		handle_object_size_mismatch(data, ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch);

void __ubsan_handle_nonnull_return(struct nonnull_return_data *data)
{
	unsigned long flags;

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

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

	pr_err("null pointer returned from function declared to never return null\n");

	if (location_is_valid(&data->attr_location))
		print_source_location("returns_nonnull attribute specified in",
				&data->attr_location);

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

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
144	static bool location_is_valid(struct source_location *loc)
145	{
146	return loc->file_name != NULL;
147	}
148
149	static DEFINE_SPINLOCK(report_lock);
150
151	static void ubsan_prologue(struct source_location *location,
152	unsigned long *flags)
153	{
154	current->in_ubsan++;
155	spin_lock_irqsave(&report_lock, *flags);
156
157	pr_err("========================================"
158	"========================================\n");
159	print_source_location("UBSAN: Undefined behaviour in", location);
160	}
161
162	static void ubsan_epilogue(unsigned long *flags)
163	{
164	dump_stack();
165	pr_err("========================================"
166	"========================================\n");
167	spin_unlock_irqrestore(&report_lock, *flags);
168	current->in_ubsan--;
169	}
170
171	static void handle_overflow(struct overflow_data *data, unsigned long lhs,
172	unsigned long rhs, char op)
173	{
174
175	struct type_descriptor *type = data->type;
176	unsigned long flags;
177	char lhs_val_str[VALUE_LENGTH];
178	char rhs_val_str[VALUE_LENGTH];
179
180	if (suppress_report(&data->location))
181	return;
182
183	ubsan_prologue(&data->location, &flags);
184
185	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
186	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
187	pr_err("%s integer overflow:\n",
188	type_is_signed(type) ? "signed" : "unsigned");
189	pr_err("%s %c %s cannot be represented in type %s\n",
190	lhs_val_str,
191	op,
192	rhs_val_str,
193	type->type_name);
194
195	ubsan_epilogue(&flags);
196	}
197
198	void __ubsan_handle_add_overflow(struct overflow_data *data,
199	unsigned long lhs,
200	unsigned long rhs)
201	{
202
203	handle_overflow(data, lhs, rhs, '+');
204	}
205	EXPORT_SYMBOL(__ubsan_handle_add_overflow);
206
207	void __ubsan_handle_sub_overflow(struct overflow_data *data,
208	unsigned long lhs,
209	unsigned long rhs)
210	{
211	handle_overflow(data, lhs, rhs, '-');
212	}
213	EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
214
215	void __ubsan_handle_mul_overflow(struct overflow_data *data,
216	unsigned long lhs,
217	unsigned long rhs)
218	{
219	handle_overflow(data, lhs, rhs, '*');
220	}
221	EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
222
223	void __ubsan_handle_negate_overflow(struct overflow_data *data,
224	unsigned long old_val)
225	{
226	unsigned long flags;
227	char old_val_str[VALUE_LENGTH];
228
229	if (suppress_report(&data->location))
230	return;
231
232	ubsan_prologue(&data->location, &flags);
233
234	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
235
236	pr_err("negation of %s cannot be represented in type %s:\n",
237	old_val_str, data->type->type_name);
238
239	ubsan_epilogue(&flags);
240	}
241	EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
242
243
244	void __ubsan_handle_divrem_overflow(struct overflow_data *data,
245	unsigned long lhs,
246	unsigned long rhs)
247	{
248	unsigned long flags;
249	char rhs_val_str[VALUE_LENGTH];
250
251	if (suppress_report(&data->location))
252	return;
253
254	ubsan_prologue(&data->location, &flags);
255
256	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
257
258	if (type_is_signed(data->type) && get_signed_val(data->type, rhs) == -1)
259	pr_err("division of %s by -1 cannot be represented in type %s\n",
260	rhs_val_str, data->type->type_name);
261	else
262	pr_err("division by zero\n");
263
264	ubsan_epilogue(&flags);
265	}
266	EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
267
268	static void handle_null_ptr_deref(struct type_mismatch_data *data)
269	{
270	unsigned long flags;
271
272	if (suppress_report(&data->location))
273	return;
274
275	ubsan_prologue(&data->location, &flags);
276
277	pr_err("%s null pointer of type %s\n",
278	type_check_kinds[data->type_check_kind],
279	data->type->type_name);
280
281	ubsan_epilogue(&flags);
282	}
283
284	static void handle_missaligned_access(struct type_mismatch_data *data,
285	unsigned long ptr)
286	{
287	unsigned long flags;
288
289	if (suppress_report(&data->location))
290	return;
291
292	ubsan_prologue(&data->location, &flags);
293
294	pr_err("%s misaligned address %p for type %s\n",
295	type_check_kinds[data->type_check_kind],
296	(void *)ptr, data->type->type_name);
297	pr_err("which requires %ld byte alignment\n", data->alignment);
298
299	ubsan_epilogue(&flags);
300	}
301
302	static void handle_object_size_mismatch(struct type_mismatch_data *data,
303	unsigned long ptr)
304	{
305	unsigned long flags;
306
307	if (suppress_report(&data->location))
308	return;
309
310	ubsan_prologue(&data->location, &flags);
901d805c	311	pr_err("%s address %p with insufficient space\n",
c6d30853 AR	312	type_check_kinds[data->type_check_kind],
	313	(void *) ptr);
	314	pr_err("for an object of type %s\n", data->type->type_name);
	315	ubsan_epilogue(&flags);
	316	}
	317
	318	void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
	319	unsigned long ptr)
	320	{
	321
	322	if (!ptr)
	323	handle_null_ptr_deref(data);
	324	else if (data->alignment && !IS_ALIGNED(ptr, data->alignment))
	325	handle_missaligned_access(data, ptr);
	326	else
	327	handle_object_size_mismatch(data, ptr);
	328	}
	329	EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
	330
	331	void __ubsan_handle_nonnull_return(struct nonnull_return_data *data)
	332	{
	333	unsigned long flags;
	334
	335	if (suppress_report(&data->location))
	336	return;
	337
	338	ubsan_prologue(&data->location, &flags);
	339
	340	pr_err("null pointer returned from function declared to never return null\n");
	341
	342	if (location_is_valid(&data->attr_location))
	343	print_source_location("returns_nonnull attribute specified in",
	344	&data->attr_location);
	345
	346	ubsan_epilogue(&flags);
	347	}
	348	EXPORT_SYMBOL(__ubsan_handle_nonnull_return);
	349
	350	void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
	351	unsigned long bound)
	352	{
	353	unsigned long flags;
	354	char bound_str[VALUE_LENGTH];
	355
	356	if (suppress_report(&data->location))
	357	return;
	358
	359	ubsan_prologue(&data->location, &flags);
	360
	361	val_to_string(bound_str, sizeof(bound_str), data->type, bound);
	362	pr_err("variable length array bound value %s <= 0\n", bound_str);
	363
	364	ubsan_epilogue(&flags);
	365	}
	366	EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);
	367
	368	void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data,
	369	unsigned long index)
	370	{
	371	unsigned long flags;
	372	char index_str[VALUE_LENGTH];
	373
	374	if (suppress_report(&data->location))
	375	return;
376
377	ubsan_prologue(&data->location, &flags);
378
379	val_to_string(index_str, sizeof(index_str), data->index_type, index);
380	pr_err("index %s is out of range for type %s\n", index_str,
381	data->array_type->type_name);
382	ubsan_epilogue(&flags);
383	}
384	EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
385
386	void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
387	unsigned long lhs, unsigned long rhs)
388	{
389	unsigned long flags;
390	struct type_descriptor *rhs_type = data->rhs_type;
391	struct type_descriptor *lhs_type = data->lhs_type;
392	char rhs_str[VALUE_LENGTH];
393	char lhs_str[VALUE_LENGTH];
394
395	if (suppress_report(&data->location))
396	return;
397
398	ubsan_prologue(&data->location, &flags);
399
400	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
401	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
402
403	if (val_is_negative(rhs_type, rhs))
404	pr_err("shift exponent %s is negative\n", rhs_str);
405
406	else if (get_unsigned_val(rhs_type, rhs) >=
407	type_bit_width(lhs_type))
408	pr_err("shift exponent %s is too large for %u-bit type %s\n",
409	rhs_str,
410	type_bit_width(lhs_type),
411	lhs_type->type_name);
412	else if (val_is_negative(lhs_type, lhs))
413	pr_err("left shift of negative value %s\n",
414	lhs_str);
415	else
416	pr_err("left shift of %s by %s places cannot be"
417	" represented in type %s\n",
418	lhs_str, rhs_str,
419	lhs_type->type_name);
420
421	ubsan_epilogue(&flags);
422	}
423	EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
424
425
426	void __noreturn
427	__ubsan_handle_builtin_unreachable(struct unreachable_data *data)
428	{
429	unsigned long flags;
430
431	ubsan_prologue(&data->location, &flags);
432	pr_err("calling __builtin_unreachable()\n");
433	ubsan_epilogue(&flags);
434	panic("can't return from __builtin_unreachable()");
435	}
436	EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
437
438	void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
439	unsigned long val)
440	{
441	unsigned long flags;
442	char val_str[VALUE_LENGTH];
443
444	if (suppress_report(&data->location))
445	return;
446
447	ubsan_prologue(&data->location, &flags);
448
449	val_to_string(val_str, sizeof(val_str), data->type, val);
450
451	pr_err("load of value %s is not a valid value for type %s\n",
452	val_str, data->type->type_name);
453
454	ubsan_epilogue(&flags);
455	}
456	EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);