blob: da1b5da406657defadf2614032c84939416f0fca (
plain) (
blame)
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
|
// RUN: %clang_analyze_cc1 -analyzer-checker=core,security.insecureAPI.vfork,unix.Vfork -verify %s
// RUN: %clang_analyze_cc1 -analyzer-checker=core,security.insecureAPI.vfork,unix.Vfork -verify -x c++ %s
#include "Inputs/system-header-simulator.h"
void foo();
// Ensure that child process is properly checked.
int f1(int x) {
pid_t pid = vfork(); // expected-warning{{Call to function 'vfork' is insecure}}
if (pid != 0)
return 0;
switch (x) {
case 0:
// Ensure that modifying pid is ok.
pid = 1; // no-warning
// Ensure that calling whitelisted routines is ok.
execl("", "", 0); // no-warning
_exit(1); // no-warning
break;
case 1:
// Ensure that writing variables is prohibited.
x = 0; // expected-warning{{This assignment is prohibited after a successful vfork}}
break;
case 2:
// Ensure that calling functions is prohibited.
foo(); // expected-warning{{This function call is prohibited after a successful vfork}}
break;
default:
// Ensure that returning from function is prohibited.
return 0; // expected-warning{{Return is prohibited after a successful vfork; call _exit() instead}}
}
while(1);
}
// Same as previous but without explicit pid variable.
int f2(int x) {
pid_t pid = vfork(); // expected-warning{{Call to function 'vfork' is insecure}}
switch (x) {
case 0:
// Ensure that writing pid is ok.
pid = 1; // no-warning
// Ensure that calling whitelisted routines is ok.
execl("", "", 0); // no-warning
_exit(1); // no-warning
break;
case 1:
// Ensure that writing variables is prohibited.
x = 0; // expected-warning{{This assignment is prohibited after a successful vfork}}
break;
case 2:
// Ensure that calling functions is prohibited.
foo(); // expected-warning{{This function call is prohibited after a successful vfork}}
break;
default:
// Ensure that returning from function is prohibited.
return 0; // expected-warning{{Return is prohibited after a successful vfork; call _exit() instead}}
}
while(1);
}
// Ensure that parent process isn't restricted.
int f3(int x) {
if (vfork() == 0) // expected-warning{{Call to function 'vfork' is insecure}}
_exit(1);
x = 0; // no-warning
foo(); // no-warning
return 0;
} // no-warning
// Unbound pids are special so test them separately.
void f4(int x) {
switch (x) {
case 0:
vfork(); // expected-warning{{Call to function 'vfork' is insecure}}
x = 0; // expected-warning{{This assignment is prohibited after a successful vfork}}
break;
case 1:
{
char args[2];
switch (vfork()) { // expected-warning{{Call to function 'vfork' is insecure}}
case 0:
args[0] = 0; // expected-warning{{This assignment is prohibited after a successful vfork}}
exit(1);
}
break;
}
case 2:
{
pid_t pid;
if ((pid = vfork()) == 0) // expected-warning{{Call to function 'vfork' is insecure}}
while(1); // no-warning
break;
}
}
while(1);
} //no-warning
void f5() {
// See "libxtables: move some code to avoid cautions in vfork man page"
// (http://lists.netfilter.org/pipermail/netfilter-buglog/2014-October/003280.html).
if (vfork() == 0) { // expected-warning{{Call to function 'vfork' is insecure}}
execl("prog", "arg1", 0); // no-warning
exit(1); // expected-warning{{This function call is prohibited after a successful vfork}}
}
}
|
