1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/**
* @file ubsan.c
* Tiny undefined behaviour sanitizer, mostly lifted from
* https://github.com/Abb1x/tinyubsan/blob/master/src/tinyubsan.c
*
* \todo: Add in more runtime info.
*/
#include <apos/types.h>
#include <apos/debug.h>
struct tu_source_location {
const char *file;
uint32_t line;
uint32_t column;
};
struct tu_type_descriptor {
uint16_t kind;
uint16_t info;
char name[];
};
struct tu_overflow_data {
struct tu_source_location location;
struct tu_type_descriptor *type;
};
struct tu_shift_out_of_bounds_data {
struct tu_source_location location;
struct tu_type_descriptor *left_type;
struct tu_type_descriptor *right_type;
};
struct tu_invalid_value_data {
struct tu_source_location location;
struct tu_type_descriptor *type;
};
struct tu_array_out_of_bounds_data {
struct tu_source_location location;
struct tu_type_descriptor *array_type;
struct tu_type_descriptor *index_type;
};
struct tu_type_mismatch_v1_data {
struct tu_source_location location;
struct tu_type_descriptor *type;
unsigned char log_alignment;
unsigned char type_check_kind;
};
struct tu_negative_vla_data {
struct tu_source_location location;
struct tu_type_descriptor *type;
};
struct tu_nonnull_return_data {
struct tu_source_location location;
};
struct tu_nonnull_arg_data {
struct tu_source_location location;
};
struct tu_unreachable_data {
struct tu_source_location location;
};
struct tu_invalid_builtin_data {
struct tu_source_location location;
unsigned char kind;
};
static void tu_print_location(const char *message,
struct tu_source_location loc)
{
bug("ubsan: %s at file %s, line %ju, column %ju\n", message, loc.file,
(uintmax_t)loc.line, (uintmax_t)loc.column);
}
void __ubsan_handle_add_overflow(struct tu_overflow_data *data)
{
tu_print_location("addition overflow", data->location);
}
void __ubsan_handle_sub_overflow(struct tu_overflow_data *data)
{
tu_print_location("subtraction overflow", data->location);
}
void __ubsan_handle_mul_overflow(struct tu_overflow_data *data)
{
tu_print_location("multiplication overflow", data->location);
}
void __ubsan_handle_divrem_overflow(struct tu_overflow_data *data)
{
tu_print_location("division overflow", data->location);
}
void __ubsan_handle_negate_overflow(struct tu_overflow_data *data)
{
tu_print_location("negation overflow", data->location);
}
void __ubsan_handle_pointer_overflow(struct tu_overflow_data *data)
{
tu_print_location("pointer overflow", data->location);
}
void __ubsan_handle_shift_out_of_bounds(
struct tu_shift_out_of_bounds_data *data)
{
tu_print_location("shift out of bounds", data->location);
}
void __ubsan_handle_load_invalid_value(struct tu_invalid_value_data *data)
{
tu_print_location("invalid load value", data->location);
}
void __ubsan_handle_out_of_bounds(struct tu_array_out_of_bounds_data *data)
{
tu_print_location("array out of bounds", data->location);
}
void __ubsan_handle_type_mismatch_v1(struct tu_type_mismatch_v1_data *data,
uintptr_t ptr)
{
if (!ptr) {
tu_print_location("use of NULL pointer", data->location);
}
else if (ptr & ((1 << data->log_alignment) - 1)) {
tu_print_location("use of misaligned pointer", data->location);
} else {
tu_print_location("no space for object", data->location);
}
}
void __ubsan_handle_vla_bound_not_positive(struct tu_negative_vla_data *data)
{
tu_print_location("variable-length argument is negative",
data->location);
}
void __ubsan_handle_nonnull_return(struct tu_nonnull_return_data *data)
{
tu_print_location("non-null return is null", data->location);
}
void __ubsan_handle_nonnull_arg(struct tu_nonnull_arg_data *data)
{
tu_print_location("non-null argument is null", data->location);
}
void __ubsan_handle_builtin_unreachable(struct tu_unreachable_data *data)
{
tu_print_location("unreachable code reached", data->location);
}
void __ubsan_handle_invalid_builtin(struct tu_invalid_builtin_data *data)
{
tu_print_location("invalid builtin", data->location);
}
|
