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/*
* Copyright (c) 2016, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <types_ext.h>
#include <kernel/panic.h>
#include <trace.h>
#include <string.h>
struct source_location {
const char *file_name;
uint32_t line;
uint32_t column;
};
struct type_descriptor {
uint16_t type_kind;
uint16_t type_info;
char type_name[1];
};
struct type_mismatch_data {
struct source_location loc;
struct type_descriptor *type;
unsigned long alignment;
unsigned char type_check_kind;
};
struct overflow_data {
struct source_location loc;
struct type_descriptor *type;
};
struct shift_out_of_bounds_data {
struct source_location loc;
struct type_descriptor *lhs_type;
struct type_descriptor *rhs_type;
};
struct out_of_bounds_data {
struct source_location loc;
struct type_descriptor *array_type;
struct type_descriptor *index_type;
};
struct unreachable_data {
struct source_location loc;
};
struct vla_bound_data {
struct source_location loc;
struct type_descriptor *type;
};
struct invalid_value_data {
struct source_location loc;
struct type_descriptor *type;
};
struct nonnull_arg_data {
struct source_location loc;
};
/*
* When compiling with -fsanitize=undefined the compiler expects functions
* with the following signatures. The functions are never called directly,
* only when undefined behavior is detected in instrumented code.
*/
void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
unsigned long ptr);
void __ubsan_handle_add_overflow(struct overflow_data *data,
unsigned long lhs, unsigned long rhs);
void __ubsan_handle_sub_overflow(struct overflow_data *data,
unsigned long lhs, unsigned long rhs);
void __ubsan_handle_mul_overflow(struct overflow_data *data,
unsigned long lhs, unsigned long rhs);
void __ubsan_handle_negate_overflow(struct overflow_data *data,
unsigned long old_val);
void __ubsan_handle_divrem_overflow(struct overflow_data *data,
unsigned long lhs, unsigned long rhs);
void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
unsigned long lhs, unsigned long rhs);
void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data,
unsigned long idx);
void __ubsan_handle_unreachable(struct unreachable_data *data);
void __ubsan_handle_missing_return(struct unreachable_data *data);
void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
unsigned long bound);
void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
unsigned long val);
void __ubsan_handle_nonnull_arg(struct nonnull_arg_data *data, size_t arg_no);
static void print_loc(const char *func, struct source_location *loc)
{
const char *f = func;
const char func_prefix[] = "__ubsan_handle";
if (!memcmp(f, func_prefix, sizeof(func_prefix) - 1))
f += sizeof(func_prefix);
EMSG_RAW("Undefined behavior %s at %s:%" PRIu32 " col %" PRIu32,
f, loc->file_name, loc->line, loc->column);
}
static volatile bool ubsan_panic = true;
void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
unsigned long ptr __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_add_overflow(struct overflow_data *data,
unsigned long lhs __unused,
unsigned long rhs __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_sub_overflow(struct overflow_data *data,
unsigned long lhs __unused,
unsigned long rhs __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_mul_overflow(struct overflow_data *data,
unsigned long lhs __unused,
unsigned long rhs __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_negate_overflow(struct overflow_data *data,
unsigned long old_val __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_divrem_overflow(struct overflow_data *data,
unsigned long lhs __unused,
unsigned long rhs __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
unsigned long lhs __unused,
unsigned long rhs __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data,
unsigned long idx __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_unreachable(struct unreachable_data *data)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __noreturn __ubsan_handle_missing_return(struct unreachable_data *data)
{
print_loc(__func__, &data->loc);
panic();
}
void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
unsigned long bound __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
unsigned long val __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
void __ubsan_handle_nonnull_arg(struct nonnull_arg_data *data,
size_t arg_no __unused)
{
print_loc(__func__, &data->loc);
if (ubsan_panic)
panic();
}
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