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
|
/* PR middle-end/82646 - bogus -Wstringop-overflow with -D_FORTIFY_SOURCE=2
on strncpy with range to a member array
{ dg-do compile }
{ dg-options "-O2 -Wstringop-overflow -ftrack-macro-expansion=0" } */
#define bos(p) __builtin_object_size (p, 1)
struct S {
char a[5];
void (*pf)(void);
};
/* Verify that none of the string function calls below triggers a warning. */
char* test_stpncpy_const_nowarn (struct S *p)
{
int n = sizeof p->a;
return __builtin_stpncpy (p->a, "123456", n);
}
char* test_strncpy_const_nowarn (struct S *p)
{
int n = sizeof p->a;
return __builtin_strncpy (p->a, "1234567", n);
}
char* test_stpncpy_chk_const_nowarn (struct S *p)
{
int n = sizeof p->a;
return __builtin___stpncpy_chk (p->a, "12345678", n, bos (p->a));
}
char* test_strncpy_chk_const_nowarn (struct S *p)
{
int n = sizeof p->a;
return __builtin___strncpy_chk (p->a, "123456789", n, bos (p->a));
}
char* test_stpncpy_range_nowarn (struct S *p, int n)
{
if (n < sizeof p->a)
n = sizeof p->a;
return __builtin_stpncpy (p->a, "123456", n);
}
char* test_strncpy_range_nowarn (struct S *p, int n)
{
if (n < sizeof p->a)
n = sizeof p->a;
return __builtin_strncpy (p->a, "1234567", n);
}
char* test_stpncpy_chk_range_nowarn (struct S *p, int n)
{
if (n < sizeof p->a)
n = sizeof p->a;
return __builtin___stpncpy_chk (p->a, "12345678", n, bos (p->a)); /* { dg-bogus "\\\[-Wstringop-overflow=]" } */
}
char* test_strncpy_chk_range_nowarn (struct S *p, int n)
{
if (n < sizeof p->a)
n = sizeof p->a;
return __builtin___strncpy_chk (p->a, "123456789", n, bos (p->a)); /* { dg-bogus "\\\[-Wstringop-overflow=]" } */
}
/* Verify that all of the string function calls below trigger a warning. */
char* test_stpncpy_const_warn (struct S *p)
{
int n = sizeof p->a;
++n;
return __builtin_stpncpy (p->a, "123456", n); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_strncpy_const_warn (struct S *p)
{
int n = sizeof p->a;
/* A call to strncpy() with a known string and small bound is folded
into memcpy() which defeats the warning in this case since memcpy
uses Object Size Type 0, i.e., the largest object that p->a may
be a part of. Use a larger bound to get around this here. */
n += 11;
return __builtin_strncpy (p->a, "1234567", n); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_stpncpy_chk_const_warn (struct S *p)
{
int n = sizeof p->a;
++n;
return __builtin___stpncpy_chk (p->a, "12345678", n, bos (p->a)); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_strncpy_chk_const_warn (struct S *p)
{
int n = sizeof p->a;
++n;
return __builtin___strncpy_chk (p->a, "123456789", n, bos (p->a)); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_stpncpy_range_warn (struct S *p, int n)
{
if (n < sizeof p->a + 1)
n = sizeof p->a + 1;
return __builtin_stpncpy (p->a, "123456", n); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_strncpy_range_warn (struct S *p, int n)
{
if (n < sizeof p->a + 1)
n = sizeof p->a + 1;
return __builtin_strncpy (p->a, "1234567", n); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_stpncpy_chk_range_warn (struct S *p, int n)
{
if (n < sizeof p->a + 1)
n = sizeof p->a + 1;
return __builtin___stpncpy_chk (p->a, "12345678", n, bos (p->a)); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
char* test_strncpy_chk_range_warn (struct S *p, int n)
{
if (n < sizeof p->a + 1)
n = sizeof p->a + 1;
return __builtin___strncpy_chk (p->a, "123456789", n, bos (p->a)); /* { dg-warning "\\\[-Wstringop-overflow=]" } */
}
|
