lib/ubsan.c - third_party/linux - Git at Google

 // 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 <linux/ubsan.h>
 #include <kunit/test-bug.h>

 #include "ubsan.h"

 #ifdef CONFIG_UBSAN_TRAP
 /*
  * Only include matches for UBSAN checks that are actually compiled in.
  * The mappings of struct SanitizerKind (the -fsanitize=xxx args) to
  * enum SanitizerHandler (the traps) in Clang is in clang/lib/CodeGen/.
  */
 const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
 {
 	switch (check_type) {
 #ifdef CONFIG_UBSAN_BOUNDS
 	/*
 	 * SanitizerKind::ArrayBounds and SanitizerKind::LocalBounds
 	 * emit SanitizerHandler::OutOfBounds.
 	 */
 	case ubsan_out_of_bounds:
 		return "UBSAN: array index out of bounds";
 #endif
 #ifdef CONFIG_UBSAN_SHIFT
 	/*
 	 * SanitizerKind::ShiftBase and SanitizerKind::ShiftExponent
 	 * emit SanitizerHandler::ShiftOutOfBounds.
 	 */
 	case ubsan_shift_out_of_bounds:
 		return "UBSAN: shift out of bounds";
 #endif
 #ifdef CONFIG_UBSAN_DIV_ZERO
 	/*
 	 * SanitizerKind::IntegerDivideByZero emits
 	 * SanitizerHandler::DivremOverflow.
 	 */
 	case ubsan_divrem_overflow:
 		return "UBSAN: divide/remainder overflow";
 #endif
 #ifdef CONFIG_UBSAN_UNREACHABLE
 	/*
 	 * SanitizerKind::Unreachable emits
 	 * SanitizerHandler::BuiltinUnreachable.
 	 */
 	case ubsan_builtin_unreachable:
 		return "UBSAN: unreachable code";
 #endif
 #if defined(CONFIG_UBSAN_BOOL) || defined(CONFIG_UBSAN_ENUM)
 	/*
 	 * SanitizerKind::Bool and SanitizerKind::Enum emit
 	 * SanitizerHandler::LoadInvalidValue.
 	 */
 	case ubsan_load_invalid_value:
 		return "UBSAN: loading invalid value";
 #endif
 #ifdef CONFIG_UBSAN_ALIGNMENT
 	/*
 	 * SanitizerKind::Alignment emits SanitizerHandler::TypeMismatch
 	 * or SanitizerHandler::AlignmentAssumption.
 	 */
 	case ubsan_alignment_assumption:
 		return "UBSAN: alignment assumption";
 	case ubsan_type_mismatch:
 		return "UBSAN: type mismatch";
 #endif
 	default:
 		return "UBSAN: unrecognized failure code";
 	}
 }

 #else
 static const char * const 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);

 	kunit_fail_current_test("%s in %s", reason, loc->file_name);
 }

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

 	current->in_ubsan--;

 	check_panic_on_warn("UBSAN");
 }

 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];
 	unsigned long ua_flags = user_access_save();

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

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

 void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
 					 unsigned long align,
 					 unsigned long offset);
 void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
 					 unsigned long align,
 					 unsigned long offset)
 {
 	struct alignment_assumption_data *data = _data;
 	unsigned long real_ptr;

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

 	ubsan_prologue(&data->location, "alignment-assumption");

 	if (offset)
 		pr_err("assumption of %lu byte alignment (with offset of %lu byte) for pointer of type %s failed",
 		       align, offset, data->type->type_name);
 	else
 		pr_err("assumption of %lu byte alignment for pointer of type %s failed",
 		       align, data->type->type_name);

 	real_ptr = ptr - offset;
 	pr_err("%saddress is %lu aligned, misalignment offset is %lu bytes",
 	       offset ? "offset " : "", BIT(real_ptr ? __ffs(real_ptr) : 0),
 	       real_ptr & (align - 1));

 	ubsan_epilogue();
 }
 EXPORT_SYMBOL(__ubsan_handle_alignment_assumption);

 #endif /* !CONFIG_UBSAN_TRAP */
	// 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 <linux/ubsan.h>
	#include <kunit/test-bug.h>

	#include "ubsan.h"

	#ifdef CONFIG_UBSAN_TRAP
	/*
	* Only include matches for UBSAN checks that are actually compiled in.
	* The mappings of struct SanitizerKind (the -fsanitize=xxx args) to
	* enum SanitizerHandler (the traps) in Clang is in clang/lib/CodeGen/.
	*/
	const char report_ubsan_failure(struct pt_regs regs, u32 check_type)
	{
	switch (check_type) {
	#ifdef CONFIG_UBSAN_BOUNDS
	/*
	* SanitizerKind::ArrayBounds and SanitizerKind::LocalBounds
	* emit SanitizerHandler::OutOfBounds.
	*/
	case ubsan_out_of_bounds:
	return "UBSAN: array index out of bounds";
	#endif
	#ifdef CONFIG_UBSAN_SHIFT
	/*
	* SanitizerKind::ShiftBase and SanitizerKind::ShiftExponent
	* emit SanitizerHandler::ShiftOutOfBounds.
	*/
	case ubsan_shift_out_of_bounds:
	return "UBSAN: shift out of bounds";
	#endif
	#ifdef CONFIG_UBSAN_DIV_ZERO
	/*
	* SanitizerKind::IntegerDivideByZero emits
	* SanitizerHandler::DivremOverflow.
	*/
	case ubsan_divrem_overflow:
	return "UBSAN: divide/remainder overflow";
	#endif
	#ifdef CONFIG_UBSAN_UNREACHABLE
	/*
	* SanitizerKind::Unreachable emits
	* SanitizerHandler::BuiltinUnreachable.
	*/
	case ubsan_builtin_unreachable:
	return "UBSAN: unreachable code";
	#endif
	#if defined(CONFIG_UBSAN_BOOL) \|\| defined(CONFIG_UBSAN_ENUM)
	/*
	* SanitizerKind::Bool and SanitizerKind::Enum emit
	* SanitizerHandler::LoadInvalidValue.
	*/
	case ubsan_load_invalid_value:
	return "UBSAN: loading invalid value";
	#endif
	#ifdef CONFIG_UBSAN_ALIGNMENT
	/*
	* SanitizerKind::Alignment emits SanitizerHandler::TypeMismatch
	* or SanitizerHandler::AlignmentAssumption.
	*/
	case ubsan_alignment_assumption:
	return "UBSAN: alignment assumption";
	case ubsan_type_mismatch:
	return "UBSAN: type mismatch";
	#endif
	default:
	return "UBSAN: unrecognized failure code";
	}
	}

	#else
	static const char * const 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);

	kunit_fail_current_test("%s in %s", reason, loc->file_name);
	}

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

	current->in_ubsan--;

	check_panic_on_warn("UBSAN");
	}

	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];
	unsigned long ua_flags = user_access_save();

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

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

	void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
	unsigned long align,
	unsigned long offset);
	void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
	unsigned long align,
	unsigned long offset)
	{
	struct alignment_assumption_data *data = _data;
	unsigned long real_ptr;

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

	ubsan_prologue(&data->location, "alignment-assumption");

	if (offset)
	pr_err("assumption of %lu byte alignment (with offset of %lu byte) for pointer of type %s failed",
	align, offset, data->type->type_name);
	else
	pr_err("assumption of %lu byte alignment for pointer of type %s failed",
	align, data->type->type_name);

	real_ptr = ptr - offset;
	pr_err("%saddress is %lu aligned, misalignment offset is %lu bytes",
	offset ? "offset " : "", BIT(real_ptr ? __ffs(real_ptr) : 0),
	real_ptr & (align - 1));

	ubsan_epilogue();
	}
	EXPORT_SYMBOL(__ubsan_handle_alignment_assumption);

	#endif /* !CONFIG_UBSAN_TRAP */