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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LIB_UBSAN_H
3#define _LIB_UBSAN_H
4
5/*
6 * ABI defined by Clang's UBSAN enum SanitizerHandler:
7 * https://github.com/llvm/llvm-project/blob/release/16.x/clang/lib/CodeGen/CodeGenFunction.h#L113
8 */
9enum ubsan_checks {
10 ubsan_add_overflow,
11 ubsan_builtin_unreachable,
12 ubsan_cfi_check_fail,
13 ubsan_divrem_overflow,
14 ubsan_dynamic_type_cache_miss,
15 ubsan_float_cast_overflow,
16 ubsan_function_type_mismatch,
17 ubsan_implicit_conversion,
18 ubsan_invalid_builtin,
19 ubsan_invalid_objc_cast,
20 ubsan_load_invalid_value,
21 ubsan_missing_return,
22 ubsan_mul_overflow,
23 ubsan_negate_overflow,
24 ubsan_nullability_arg,
25 ubsan_nullability_return,
26 ubsan_nonnull_arg,
27 ubsan_nonnull_return,
28 ubsan_out_of_bounds,
29 ubsan_pointer_overflow,
30 ubsan_shift_out_of_bounds,
31 ubsan_sub_overflow,
32 ubsan_type_mismatch,
33 ubsan_alignment_assumption,
34 ubsan_vla_bound_not_positive,
35};
36
37enum {
38 type_kind_int = 0,
39 type_kind_float = 1,
40 type_unknown = 0xffff
41};
42
43struct type_descriptor {
44 u16 type_kind;
45 u16 type_info;
46 char type_name[];
47};
48
49struct source_location {
50 const char *file_name;
51 union {
52 unsigned long reported;
53 struct {
54 u32 line;
55 u32 column;
56 };
57 };
58};
59
60struct overflow_data {
61 struct source_location location;
62 struct type_descriptor *type;
63};
64
65struct implicit_conversion_data {
66 struct source_location location;
67 struct type_descriptor *from_type;
68 struct type_descriptor *to_type;
69 unsigned char type_check_kind;
70};
71
72struct type_mismatch_data {
73 struct source_location location;
74 struct type_descriptor *type;
75 unsigned long alignment;
76 unsigned char type_check_kind;
77};
78
79struct type_mismatch_data_v1 {
80 struct source_location location;
81 struct type_descriptor *type;
82 unsigned char log_alignment;
83 unsigned char type_check_kind;
84};
85
86struct type_mismatch_data_common {
87 struct source_location *location;
88 struct type_descriptor *type;
89 unsigned long alignment;
90 unsigned char type_check_kind;
91};
92
93struct nonnull_arg_data {
94 struct source_location location;
95 struct source_location attr_location;
96 int arg_index;
97};
98
99struct out_of_bounds_data {
100 struct source_location location;
101 struct type_descriptor *array_type;
102 struct type_descriptor *index_type;
103};
104
105struct shift_out_of_bounds_data {
106 struct source_location location;
107 struct type_descriptor *lhs_type;
108 struct type_descriptor *rhs_type;
109};
110
111struct unreachable_data {
112 struct source_location location;
113};
114
115struct invalid_value_data {
116 struct source_location location;
117 struct type_descriptor *type;
118};
119
120struct alignment_assumption_data {
121 struct source_location location;
122 struct source_location assumption_location;
123 struct type_descriptor *type;
124};
125
126#if defined(CONFIG_ARCH_SUPPORTS_INT128)
127typedef __int128 s_max;
128typedef unsigned __int128 u_max;
129#else
130typedef s64 s_max;
131typedef u64 u_max;
132#endif
133
134/*
135 * When generating Runtime Calls, Clang doesn't respect the -mregparm=3
136 * option used on i386: https://github.com/llvm/llvm-project/issues/89670
137 * Fix this for earlier Clang versions by forcing the calling convention
138 * to use non-register arguments.
139 */
140#if defined(CONFIG_X86_32) && \
141 defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 190000
142# define ubsan_linkage asmlinkage
143#else
144# define ubsan_linkage
145#endif
146
147void ubsan_linkage __ubsan_handle_add_overflow(void *data, void *lhs, void *rhs);
148void ubsan_linkage __ubsan_handle_sub_overflow(void *data, void *lhs, void *rhs);
149void ubsan_linkage __ubsan_handle_mul_overflow(void *data, void *lhs, void *rhs);
150void ubsan_linkage __ubsan_handle_negate_overflow(void *_data, void *old_val);
151void ubsan_linkage __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs);
152void ubsan_linkage __ubsan_handle_implicit_conversion(void *_data, void *lhs, void *rhs);
153void ubsan_linkage __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr);
154void ubsan_linkage __ubsan_handle_type_mismatch_v1(void *_data, void *ptr);
155void ubsan_linkage __ubsan_handle_out_of_bounds(void *_data, void *index);
156void ubsan_linkage __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs);
157void ubsan_linkage __ubsan_handle_builtin_unreachable(void *_data);
158void ubsan_linkage __ubsan_handle_load_invalid_value(void *_data, void *val);
159void ubsan_linkage __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
160 unsigned long align,
161 unsigned long offset);
162
163#endif