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
| // RUN: %clangxx_msan -O0 %s -o %t && %run %t %p 2>&1
// RUN: %clangxx_msan -O0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t %p 2>&1
// RUN: %clangxx_msan -O3 %s -o %t && %run %t %p 2>&1
#include <argz.h>
#include <assert.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sanitizer/msan_interface.h>
// Do not depend on libattr headers.
#ifndef ENOATTR
#define ENOATTR ENODATA
#endif
extern "C" {
ssize_t listxattr(const char *path, char *list, size_t size);
ssize_t llistxattr(const char *path, char *list, size_t size);
ssize_t flistxattr(int fd, char *list, size_t size);
ssize_t getxattr(const char *path, const char *name, void *value, size_t size);
ssize_t lgetxattr(const char *path, const char *name, void *value, size_t size);
ssize_t fgetxattr(int fd, const char *name, void *value, size_t size);
}
char g_path[1024];
int g_fd;
// Life before closures...
ssize_t listxattr_wrapper(char *buf, size_t size) {
return listxattr(g_path, buf, size);
}
ssize_t llistxattr_wrapper(char *buf, size_t size) {
return llistxattr(g_path, buf, size);
}
ssize_t flistxattr_wrapper(char *buf, size_t size) {
return flistxattr(g_fd, buf, size);
}
ssize_t getxattr_wrapper(const char *name, char *buf, size_t size) {
return getxattr(g_path, name, buf, size);
}
ssize_t lgetxattr_wrapper(const char *name, char *buf, size_t size) {
return lgetxattr(g_path, name, buf, size);
}
ssize_t fgetxattr_wrapper(const char *name, char *buf, size_t size) {
return fgetxattr(g_fd, name, buf, size);
}
size_t test_list(ssize_t fun(char*, size_t), char **buf) {
int buf_size = 1024;
while (true) {
*buf = (char *)malloc(buf_size);
assert(__msan_test_shadow(*buf, buf_size) != -1);
ssize_t res = fun(*buf, buf_size);
if (res >= 0) {
assert(__msan_test_shadow(*buf, buf_size) == res);
return res;
}
if (errno == ENOTSUP) {
printf("Extended attributes are disabled. *xattr test is a no-op.\n");
exit(0);
}
assert(errno == ERANGE);
free(*buf);
buf_size *= 2;
}
}
// True means success. False means result inconclusive because we don't have
// access to this attribute.
bool test_get_single_attr(ssize_t fun(const char *, char *, size_t),
const char *attr_name) {
char *buf;
int buf_size = 1024;
while (true) {
buf = (char *)malloc(buf_size);
assert(__msan_test_shadow(buf, buf_size) != -1);
ssize_t res = fun(attr_name, buf, buf_size);
if (res >= 0) {
assert(__msan_test_shadow(buf, buf_size) == res);
free(buf);
return true;
}
if (errno == ENOTSUP) {
printf("Extended attributes are disabled. *xattr test is a no-op.\n");
exit(0);
}
if (errno == ENOATTR)
return false;
assert(errno == ERANGE);
free(buf);
buf_size *= 2;
}
}
void test_get(ssize_t fun(const char *, char *, size_t), const char *attr_list,
size_t attr_list_size) {
// Try every attribute, until we see one we can access. Attribute names are
// null-separated strings in attr_list.
size_t attr_list_len = argz_count(attr_list, attr_list_size);
size_t argv_size = (attr_list_len + 1) * sizeof(char *);
char **attrs = (char **)malloc(argv_size);
argz_extract(attr_list, attr_list_size, attrs);
// TODO(smatveev): we need proper argz_* interceptors
__msan_unpoison(attrs, argv_size);
for (size_t i = 0; (i < attr_list_len) && attrs[i]; i++) {
if (test_get_single_attr(fun, attrs[i]))
return;
}
printf("*xattr test could not access any attributes.\n");
}
// TODO: set some attributes before trying to retrieve them with *getxattr.
// Currently the list is empty, so *getxattr is not tested.
int main(int argc, char *argv[]) {
assert(argc == 2);
snprintf(g_path, sizeof(g_path), "%s/%s", argv[1], "xattr_test_root/a");
g_fd = open(g_path, O_RDONLY);
assert(g_fd);
char *attr_list;
size_t attr_list_size;
attr_list_size = test_list(listxattr_wrapper, &attr_list);
free(attr_list);
attr_list_size = test_list(llistxattr_wrapper, &attr_list);
free(attr_list);
attr_list_size = test_list(flistxattr_wrapper, &attr_list);
test_get(getxattr_wrapper, attr_list, attr_list_size);
test_get(lgetxattr_wrapper, attr_list, attr_list_size);
test_get(fgetxattr_wrapper, attr_list, attr_list_size);
free(attr_list);
return 0;
}
|