[mirror_ubuntu-hirsute-kernel.git] / lib / ubsan.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * UBSAN error reporting functions
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
 * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
 */

#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 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)
			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 void ubsan_prologue(struct source_location *loc, const char *reason)
{
	current->in_ubsan++;

	pr_err("========================================"
		"========================================\n");
	pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name,
		loc->line & LINE_MASK, loc->column & COLUMN_MASK);
}

static void ubsan_epilogue(void)
{
	dump_stack();
	pr_err("========================================"
		"========================================\n");

	current->in_ubsan--;

	if (panic_on_warn) {
		/*
		 * This thread may hit another WARN() in the panic path.
		 * Resetting this prevents additional WARN() from panicking the
		 * system on this thread.  Other threads are blocked by the
		 * panic_mutex in panic().
		 */
		panic_on_warn = 0;
		panic("panic_on_warn set ...\n");
	}
}

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

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

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

	ubsan_prologue(&data->location, type_is_signed(type) ?
			"signed-integer-overflow" :
			"unsigned-integer-overflow");

	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 %c %s cannot be represented in type %s\n",
		lhs_val_str,
		op,
		rhs_val_str,
		type->type_name);

	ubsan_epilogue();
}

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

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

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

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

void __ubsan_handle_negate_overflow(void *_data, void *old_val)
{
	struct overflow_data *data = _data;
	char old_val_str[VALUE_LENGTH];

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

	ubsan_prologue(&data->location, "negation-overflow");

	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();
}
EXPORT_SYMBOL(__ubsan_handle_negate_overflow);


void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
{
	struct overflow_data *data = _data;
	char rhs_val_str[VALUE_LENGTH];

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

	ubsan_prologue(&data->location, "division-overflow");

	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();
}
EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);

static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
{
	if (suppress_report(data->location))
		return;

	ubsan_prologue(data->location, "null-ptr-deref");

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

	ubsan_epilogue();
}

static void handle_misaligned_access(struct type_mismatch_data_common *data,
				unsigned long ptr)
{
	if (suppress_report(data->location))
		return;

	ubsan_prologue(data->location, "misaligned-access");

	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();
}

static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
					unsigned long ptr)
{
	if (suppress_report(data->location))
		return;

	ubsan_prologue(data->location, "object-size-mismatch");
	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();
}

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(void *_data, void *ptr)
{
	struct type_mismatch_data_v1 *data = _data;
	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(void *_data, void *index)
{
	struct out_of_bounds_data *data = _data;
	char index_str[VALUE_LENGTH];

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

	ubsan_prologue(&data->location, "array-index-out-of-bounds");

	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();
}
EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);

void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
{
	struct shift_out_of_bounds_data *data = _data;
	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];
	unsigned long ua_flags = user_access_save();

	if (suppress_report(&data->location))
		goto out;

	ubsan_prologue(&data->location, "shift-out-of-bounds");

	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();
out:
	user_access_restore(ua_flags);
}
EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);


void __ubsan_handle_builtin_unreachable(void *_data)
{
	struct unreachable_data *data = _data;
	ubsan_prologue(&data->location, "unreachable");
	pr_err("calling __builtin_unreachable()\n");
	ubsan_epilogue();
	panic("can't return from __builtin_unreachable()");
}
EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);

void __ubsan_handle_load_invalid_value(void *_data, void *val)
{
	struct invalid_value_data *data = _data;
	char val_str[VALUE_LENGTH];

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

	ubsan_prologue(&data->location, "invalid-load");

	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();
}
EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
c6d30853 AR	2	/*
	3	* UBSAN error reporting functions
	4	*
	5	* Copyright (c) 2014 Samsung Electronics Co., Ltd.
	6	* Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
c6d30853 AR	7	*/
	8
	9	#include <linux/bitops.h>
	10	#include <linux/bug.h>
	11	#include <linux/ctype.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/types.h>
	15	#include <linux/sched.h>
d08965a2	16	#include <linux/uaccess.h>
c6d30853 AR	17
	18	#include "ubsan.h"
	19
	20	const char *type_check_kinds[] = {
	21	"load of",
	22	"store to",
	23	"reference binding to",
	24	"member access within",
	25	"member call on",
	26	"constructor call on",
	27	"downcast of",
	28	"downcast of"
	29	};
	30
	31	#define REPORTED_BIT 31
	32
	33	#if (BITS_PER_LONG == 64) && defined(__BIG_ENDIAN)
	34	#define COLUMN_MASK (~(1U << REPORTED_BIT))
	35	#define LINE_MASK (~0U)
	36	#else
	37	#define COLUMN_MASK (~0U)
	38	#define LINE_MASK (~(1U << REPORTED_BIT))
	39	#endif
	40
	41	#define VALUE_LENGTH 40
	42
	43	static bool was_reported(struct source_location *location)
	44	{
	45	return test_and_set_bit(REPORTED_BIT, &location->reported);
	46	}
	47
c6d30853 AR	48	static bool suppress_report(struct source_location *loc)
	49	{
	50	return current->in_ubsan \|\| was_reported(loc);
	51	}
	52
	53	static bool type_is_int(struct type_descriptor *type)
	54	{
	55	return type->type_kind == type_kind_int;
	56	}
	57
	58	static bool type_is_signed(struct type_descriptor *type)
	59	{
	60	WARN_ON(!type_is_int(type));
	61	return type->type_info & 1;
	62	}
	63
	64	static unsigned type_bit_width(struct type_descriptor *type)
	65	{
	66	return 1 << (type->type_info >> 1);
	67	}
	68
	69	static bool is_inline_int(struct type_descriptor *type)
	70	{
	71	unsigned inline_bits = sizeof(unsigned long)*8;
	72	unsigned bits = type_bit_width(type);
	73
	74	WARN_ON(!type_is_int(type));
	75
	76	return bits <= inline_bits;
	77	}
	78
f0996bc2	79	static s_max get_signed_val(struct type_descriptor type, void val)
c6d30853 AR	80	{
	81	if (is_inline_int(type)) {
	82	unsigned extra_bits = sizeof(s_max)*8 - type_bit_width(type);
f0996bc2 AR	83	unsigned long ulong_val = (unsigned long)val;
	84
	85	return ((s_max)ulong_val) << extra_bits >> extra_bits;
c6d30853 AR	86	}
	87
	88	if (type_bit_width(type) == 64)
	89	return (s64 )val;
	90
	91	return (s_max )val;
	92	}
	93
f0996bc2	94	static bool val_is_negative(struct type_descriptor type, void val)
c6d30853 AR	95	{
	96	return type_is_signed(type) && get_signed_val(type, val) < 0;
	97	}
	98
f0996bc2	99	static u_max get_unsigned_val(struct type_descriptor type, void val)
c6d30853 AR	100	{
c6d30853 AR	101	if (is_inline_int(type))
f0996bc2	102	return (unsigned long)val;
c6d30853 AR	103
	104	if (type_bit_width(type) == 64)
	105	return (u64 )val;
	106
	107	return (u_max )val;
	108	}
	109
	110	static void val_to_string(char str, size_t size, struct type_descriptor type,
f0996bc2	111	void *value)
c6d30853 AR	112	{
	113	if (type_is_int(type)) {
	114	if (type_bit_width(type) == 128) {
c12d3362	115	#if defined(CONFIG_ARCH_SUPPORTS_INT128)
c6d30853 AR	116	u_max val = get_unsigned_val(type, value);
	117
	118	scnprintf(str, size, "0x%08x%08x%08x%08x",
	119	(u32)(val >> 96),
	120	(u32)(val >> 64),
	121	(u32)(val >> 32),
	122	(u32)(val));
	123	#else
	124	WARN_ON(1);
	125	#endif
	126	} else if (type_is_signed(type)) {
	127	scnprintf(str, size, "%lld",
	128	(s64)get_signed_val(type, value));
	129	} else {
	130	scnprintf(str, size, "%llu",
	131	(u64)get_unsigned_val(type, value));
	132	}
	133	}
	134	}
	135
ef065653	136	static void ubsan_prologue(struct source_location loc, const char reason)
c6d30853 AR	137	{
c6d30853 AR	138	current->in_ubsan++;
c6d30853 AR	139
	140	pr_err("========================================"
	141	"========================================\n");
ef065653 KC	142	pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name,
ef065653 KC	143	loc->line & LINE_MASK, loc->column & COLUMN_MASK);
c6d30853 AR	144	}
c6d30853 AR	145
ce5c31db	146	static void ubsan_epilogue(void)
c6d30853 AR	147	{
	148	dump_stack();
	149	pr_err("========================================"
	150	"========================================\n");
ce5c31db	151
c6d30853	152	current->in_ubsan--;
1d28c8d6 KC	153
	154	if (panic_on_warn) {
	155	/*
	156	* This thread may hit another WARN() in the panic path.
	157	* Resetting this prevents additional WARN() from panicking the
	158	* system on this thread. Other threads are blocked by the
	159	* panic_mutex in panic().
	160	*/
	161	panic_on_warn = 0;
	162	panic("panic_on_warn set ...\n");
	163	}
c6d30853 AR	164	}
c6d30853 AR	165
f0996bc2 AR	166	static void handle_overflow(struct overflow_data data, void lhs,
f0996bc2 AR	167	void *rhs, char op)
c6d30853 AR	168	{
	169
	170	struct type_descriptor *type = data->type;
c6d30853 AR	171	char lhs_val_str[VALUE_LENGTH];
	172	char rhs_val_str[VALUE_LENGTH];
	173
	174	if (suppress_report(&data->location))
	175	return;
	176
ef065653 KC	177	ubsan_prologue(&data->location, type_is_signed(type) ?
	178	"signed-integer-overflow" :
	179	"unsigned-integer-overflow");
c6d30853 AR	180
	181	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
	182	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
c6d30853 AR	183	pr_err("%s %c %s cannot be represented in type %s\n",
	184	lhs_val_str,
	185	op,
	186	rhs_val_str,
	187	type->type_name);
	188
ce5c31db	189	ubsan_epilogue();
c6d30853 AR	190	}
c6d30853 AR	191
469cbd01	192	void __ubsan_handle_add_overflow(void *data,
f0996bc2	193	void lhs, void rhs)
c6d30853 AR	194	{
	195
	196	handle_overflow(data, lhs, rhs, '+');
	197	}
	198	EXPORT_SYMBOL(__ubsan_handle_add_overflow);
	199
469cbd01	200	void __ubsan_handle_sub_overflow(void *data,
f0996bc2	201	void lhs, void rhs)
c6d30853 AR	202	{
	203	handle_overflow(data, lhs, rhs, '-');
	204	}
	205	EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
	206
469cbd01	207	void __ubsan_handle_mul_overflow(void *data,
f0996bc2	208	void lhs, void rhs)
c6d30853 AR	209	{
	210	handle_overflow(data, lhs, rhs, '*');
	211	}
	212	EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
	213
469cbd01	214	void __ubsan_handle_negate_overflow(void _data, void old_val)
c6d30853	215	{
469cbd01	216	struct overflow_data *data = _data;
c6d30853 AR	217	char old_val_str[VALUE_LENGTH];
	218
	219	if (suppress_report(&data->location))
	220	return;
	221
ef065653	222	ubsan_prologue(&data->location, "negation-overflow");
c6d30853 AR	223
	224	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
	225
	226	pr_err("negation of %s cannot be represented in type %s:\n",
	227	old_val_str, data->type->type_name);
	228
ce5c31db	229	ubsan_epilogue();
c6d30853 AR	230	}
	231	EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
	232
	233
469cbd01	234	void __ubsan_handle_divrem_overflow(void _data, void lhs, void *rhs)
c6d30853	235	{
469cbd01	236	struct overflow_data *data = _data;
c6d30853 AR	237	char rhs_val_str[VALUE_LENGTH];
	238
	239	if (suppress_report(&data->location))
	240	return;
	241
ef065653	242	ubsan_prologue(&data->location, "division-overflow");
c6d30853 AR	243
	244	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
	245
	246	if (type_is_signed(data->type) && get_signed_val(data->type, rhs) == -1)
	247	pr_err("division of %s by -1 cannot be represented in type %s\n",
	248	rhs_val_str, data->type->type_name);
	249	else
	250	pr_err("division by zero\n");
	251
ce5c31db	252	ubsan_epilogue();
c6d30853 AR	253	}
	254	EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
	255
42440c1f	256	static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
c6d30853	257	{
42440c1f	258	if (suppress_report(data->location))
c6d30853 AR	259	return;
c6d30853 AR	260
ef065653	261	ubsan_prologue(data->location, "null-ptr-deref");
c6d30853 AR	262
	263	pr_err("%s null pointer of type %s\n",
	264	type_check_kinds[data->type_check_kind],
	265	data->type->type_name);
	266
ce5c31db	267	ubsan_epilogue();
c6d30853 AR	268	}
c6d30853 AR	269
42440c1f	270	static void handle_misaligned_access(struct type_mismatch_data_common *data,
c6d30853 AR	271	unsigned long ptr)
c6d30853 AR	272	{
42440c1f	273	if (suppress_report(data->location))
c6d30853 AR	274	return;
c6d30853 AR	275
ef065653	276	ubsan_prologue(data->location, "misaligned-access");
c6d30853 AR	277
	278	pr_err("%s misaligned address %p for type %s\n",
	279	type_check_kinds[data->type_check_kind],
	280	(void *)ptr, data->type->type_name);
	281	pr_err("which requires %ld byte alignment\n", data->alignment);
	282
ce5c31db	283	ubsan_epilogue();
c6d30853 AR	284	}
c6d30853 AR	285
42440c1f	286	static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
c6d30853 AR	287	unsigned long ptr)
c6d30853 AR	288	{
42440c1f	289	if (suppress_report(data->location))
c6d30853 AR	290	return;
c6d30853 AR	291
ef065653	292	ubsan_prologue(data->location, "object-size-mismatch");
901d805c	293	pr_err("%s address %p with insufficient space\n",
c6d30853 AR	294	type_check_kinds[data->type_check_kind],
	295	(void *) ptr);
	296	pr_err("for an object of type %s\n", data->type->type_name);
ce5c31db	297	ubsan_epilogue();
c6d30853 AR	298	}
c6d30853 AR	299
42440c1f	300	static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
c6d30853 AR	301	unsigned long ptr)
c6d30853 AR	302	{
d08965a2	303	unsigned long flags = user_access_save();
c6d30853 AR	304
	305	if (!ptr)
	306	handle_null_ptr_deref(data);
	307	else if (data->alignment && !IS_ALIGNED(ptr, data->alignment))
b8fe1120	308	handle_misaligned_access(data, ptr);
c6d30853 AR	309	else
c6d30853 AR	310	handle_object_size_mismatch(data, ptr);
d08965a2 PZ	311
d08965a2 PZ	312	user_access_restore(flags);
c6d30853	313	}
42440c1f AR	314
42440c1f AR	315	void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
f0996bc2	316	void *ptr)
42440c1f AR	317	{
	318	struct type_mismatch_data_common common_data = {
	319	.location = &data->location,
	320	.type = data->type,
	321	.alignment = data->alignment,
	322	.type_check_kind = data->type_check_kind
	323	};
	324
f0996bc2	325	ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
42440c1f	326	}
c6d30853 AR	327	EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
c6d30853 AR	328
469cbd01	329	void __ubsan_handle_type_mismatch_v1(void _data, void ptr)
42440c1f	330	{
469cbd01	331	struct type_mismatch_data_v1 *data = _data;
42440c1f AR	332	struct type_mismatch_data_common common_data = {
	333	.location = &data->location,
	334	.type = data->type,
	335	.alignment = 1UL << data->log_alignment,
	336	.type_check_kind = data->type_check_kind
	337	};
	338
f0996bc2	339	ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
42440c1f AR	340	}
	341	EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
	342
469cbd01	343	void __ubsan_handle_out_of_bounds(void _data, void index)
c6d30853	344	{
469cbd01	345	struct out_of_bounds_data *data = _data;
c6d30853 AR	346	char index_str[VALUE_LENGTH];
	347
	348	if (suppress_report(&data->location))
	349	return;
	350
ef065653	351	ubsan_prologue(&data->location, "array-index-out-of-bounds");
c6d30853 AR	352
	353	val_to_string(index_str, sizeof(index_str), data->index_type, index);
	354	pr_err("index %s is out of range for type %s\n", index_str,
	355	data->array_type->type_name);
ce5c31db	356	ubsan_epilogue();
c6d30853 AR	357	}
	358	EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
	359
469cbd01	360	void __ubsan_handle_shift_out_of_bounds(void _data, void lhs, void *rhs)
c6d30853	361	{
469cbd01	362	struct shift_out_of_bounds_data *data = _data;
c6d30853 AR	363	struct type_descriptor *rhs_type = data->rhs_type;
	364	struct type_descriptor *lhs_type = data->lhs_type;
	365	char rhs_str[VALUE_LENGTH];
	366	char lhs_str[VALUE_LENGTH];
9a50dcaf	367	unsigned long ua_flags = user_access_save();
c6d30853 AR	368
c6d30853 AR	369	if (suppress_report(&data->location))
9a50dcaf	370	goto out;
c6d30853	371
ef065653	372	ubsan_prologue(&data->location, "shift-out-of-bounds");
c6d30853 AR	373
	374	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
	375	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
	376
	377	if (val_is_negative(rhs_type, rhs))
	378	pr_err("shift exponent %s is negative\n", rhs_str);
	379
	380	else if (get_unsigned_val(rhs_type, rhs) >=
	381	type_bit_width(lhs_type))
	382	pr_err("shift exponent %s is too large for %u-bit type %s\n",
	383	rhs_str,
	384	type_bit_width(lhs_type),
	385	lhs_type->type_name);
	386	else if (val_is_negative(lhs_type, lhs))
	387	pr_err("left shift of negative value %s\n",
	388	lhs_str);
	389	else
	390	pr_err("left shift of %s by %s places cannot be"
	391	" represented in type %s\n",
	392	lhs_str, rhs_str,
	393	lhs_type->type_name);
	394
ce5c31db	395	ubsan_epilogue();
9a50dcaf PZ	396	out:
9a50dcaf PZ	397	user_access_restore(ua_flags);
c6d30853 AR	398	}
	399	EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
	400
	401
469cbd01	402	void __ubsan_handle_builtin_unreachable(void *_data)
c6d30853	403	{
469cbd01	404	struct unreachable_data *data = _data;
ef065653	405	ubsan_prologue(&data->location, "unreachable");
c6d30853	406	pr_err("calling __builtin_unreachable()\n");
ce5c31db	407	ubsan_epilogue();
c6d30853 AR	408	panic("can't return from __builtin_unreachable()");
	409	}
	410	EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
	411
469cbd01	412	void __ubsan_handle_load_invalid_value(void _data, void val)
c6d30853	413	{
469cbd01	414	struct invalid_value_data *data = _data;
c6d30853 AR	415	char val_str[VALUE_LENGTH];
	416
	417	if (suppress_report(&data->location))
	418	return;
	419
ef065653	420	ubsan_prologue(&data->location, "invalid-load");
c6d30853 AR	421
	422	val_to_string(val_str, sizeof(val_str), data->type, val);
	423
	424	pr_err("load of value %s is not a valid value for type %s\n",
	425	val_str, data->type->type_name);
	426
ce5c31db	427	ubsan_epilogue();
c6d30853 AR	428	}
c6d30853 AR	429	EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);