blob: 1f771c2b3bd13895be0f717ca015f22841912f08 (
plain)
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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
// RUN: %clang_analyze_cc1 -Wno-array-bounds -analyzer-checker=core,alpha.security.ArrayBoundV2,debug.ExprInspection -verify %s
void clang_analyzer_eval(int);
// Tests doing an out-of-bounds access after the end of an array using:
// - constant integer index
// - constant integer size for buffer
void test1(int x) {
int buf[100];
buf[100] = 1; // expected-warning{{Out of bound access to memory}}
}
void test1_ok(int x) {
int buf[100];
buf[99] = 1; // no-warning
}
const char test1_strings_underrun(int x) {
const char *mystr = "mary had a little lamb";
return mystr[-1]; // expected-warning{{Out of bound access to memory}}
}
const char test1_strings_overrun(int x) {
const char *mystr = "mary had a little lamb";
return mystr[1000]; // expected-warning{{Out of bound access to memory}}
}
const char test1_strings_ok(int x) {
const char *mystr = "mary had a little lamb";
return mystr[5]; // no-warning
}
// Tests doing an out-of-bounds access after the end of an array using:
// - indirect pointer to buffer
// - constant integer index
// - constant integer size for buffer
void test1_ptr(int x) {
int buf[100];
int *p = buf;
p[101] = 1; // expected-warning{{Out of bound access to memory}}
}
void test1_ptr_ok(int x) {
int buf[100];
int *p = buf;
p[99] = 1; // no-warning
}
// Tests doing an out-of-bounds access before the start of an array using:
// - indirect pointer to buffer, manipulated using simple pointer arithmetic
// - constant integer index
// - constant integer size for buffer
void test1_ptr_arith(int x) {
int buf[100];
int *p = buf;
p = p + 100;
p[0] = 1; // expected-warning{{Out of bound access to memory}}
}
void test1_ptr_arith_ok(int x) {
int buf[100];
int *p = buf;
p = p + 99;
p[0] = 1; // no-warning
}
void test1_ptr_arith_bad(int x) {
int buf[100];
int *p = buf;
p = p + 99;
p[1] = 1; // expected-warning{{Out of bound access to memory}}
}
void test1_ptr_arith_ok2(int x) {
int buf[100];
int *p = buf;
p = p + 99;
p[-1] = 1; // no-warning
}
// Tests doing an out-of-bounds access before the start of an array using:
// - constant integer index
// - constant integer size for buffer
void test2(int x) {
int buf[100];
buf[-1] = 1; // expected-warning{{Out of bound access to memory}}
}
// Tests doing an out-of-bounds access before the start of an array using:
// - indirect pointer to buffer
// - constant integer index
// - constant integer size for buffer
void test2_ptr(int x) {
int buf[100];
int *p = buf;
p[-1] = 1; // expected-warning{{Out of bound access to memory}}
}
// Tests doing an out-of-bounds access before the start of an array using:
// - indirect pointer to buffer, manipulated using simple pointer arithmetic
// - constant integer index
// - constant integer size for buffer
void test2_ptr_arith(int x) {
int buf[100];
int *p = buf;
--p;
p[0] = 1; // expected-warning {{Out of bound access to memory preceding}}
}
// Tests doing an out-of-bounds access before the start of a multi-dimensional
// array using:
// - constant integer indices
// - constant integer sizes for the array
void test2_multi(int x) {
int buf[100][100];
buf[0][-1] = 1; // expected-warning{{Out of bound access to memory}}
}
// Tests doing an out-of-bounds access before the start of a multi-dimensional
// array using:
// - constant integer indices
// - constant integer sizes for the array
void test2_multi_b(int x) {
int buf[100][100];
buf[-1][0] = 1; // expected-warning{{Out of bound access to memory}}
}
void test2_multi_ok(int x) {
int buf[100][100];
buf[0][0] = 1; // no-warning
}
void test3(int x) {
int buf[100];
if (x < 0)
buf[x] = 1; // expected-warning{{Out of bound access to memory}}
}
void test4(int x) {
int buf[100];
if (x > 99)
buf[x] = 1; // expected-warning{{Out of bound access to memory}}
}
void test_assume_after_access(unsigned long x) {
int buf[100];
buf[x] = 1;
clang_analyzer_eval(x <= 99); // expected-warning{{TRUE}}
}
// Don't warn when indexing below the start of a symbolic region's whose
// base extent we don't know.
int *get_symbolic(void);
void test_underflow_symbolic(void) {
int *buf = get_symbolic();
buf[-1] = 0; // no-warning;
}
// But warn if we understand the internal memory layout of a symbolic region.
typedef struct {
int id;
char name[256];
} user_t;
user_t *get_symbolic_user(void);
char test_underflow_symbolic_2() {
user_t *user = get_symbolic_user();
return user->name[-1]; // expected-warning{{Out of bound access to memory}}
}
void test_incomplete_struct(void) {
extern struct incomplete incomplete;
int *p = (int *)&incomplete;
p[1] = 42; // no-warning
}
void test_extern_void(void) {
extern void v;
int *p = (int *)&v;
p[1] = 42; // no-warning
}
void test_assume_after_access2(unsigned long x) {
char buf[100];
buf[x] = 1;
clang_analyzer_eval(x <= 99); // expected-warning{{TRUE}}
}
struct incomplete;
char test_comparison_with_extent_symbol(struct incomplete *p) {
// Previously this was reported as a (false positive) overflow error because
// the extent symbol of the area pointed by `p` was an unsigned and the '-1'
// was converted to its type by `evalBinOpNN`.
return ((char *)p)[-1]; // no-warning
}
|