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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Author: Aleksa Sarai <cyphar@cyphar.com>
* Copyright (C) 2018-2019 SUSE LLC.
*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include "../kselftest.h"
#include "helpers.h"
/*
* O_LARGEFILE is set to 0 by glibc.
* XXX: This is wrong on {mips, parisc, powerpc, sparc}.
*/
#undef O_LARGEFILE
#define O_LARGEFILE 0x8000
struct open_how_ext {
struct open_how inner;
uint32_t extra1;
char pad1[128];
uint32_t extra2;
char pad2[128];
uint32_t extra3;
};
struct struct_test {
const char *name;
struct open_how_ext arg;
size_t size;
int err;
};
#define NUM_OPENAT2_STRUCT_TESTS 7
#define NUM_OPENAT2_STRUCT_VARIATIONS 13
void test_openat2_struct(void)
{
int misalignments[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 17, 87 };
struct struct_test tests[] = {
/* Normal struct. */
{ .name = "normal struct",
.arg.inner.flags = O_RDONLY,
.size = sizeof(struct open_how) },
/* Bigger struct, with zeroed out end. */
{ .name = "bigger struct (zeroed out)",
.arg.inner.flags = O_RDONLY,
.size = sizeof(struct open_how_ext) },
/* TODO: Once expanded, check zero-padding. */
/* Smaller than version-0 struct. */
{ .name = "zero-sized 'struct'",
.arg.inner.flags = O_RDONLY, .size = 0, .err = -EINVAL },
{ .name = "smaller-than-v0 struct",
.arg.inner.flags = O_RDONLY,
.size = OPEN_HOW_SIZE_VER0 - 1, .err = -EINVAL },
/* Bigger struct, with non-zero trailing bytes. */
{ .name = "bigger struct (non-zero data in first 'future field')",
.arg.inner.flags = O_RDONLY, .arg.extra1 = 0xdeadbeef,
.size = sizeof(struct open_how_ext), .err = -E2BIG },
{ .name = "bigger struct (non-zero data in middle of 'future fields')",
.arg.inner.flags = O_RDONLY, .arg.extra2 = 0xfeedcafe,
.size = sizeof(struct open_how_ext), .err = -E2BIG },
{ .name = "bigger struct (non-zero data at end of 'future fields')",
.arg.inner.flags = O_RDONLY, .arg.extra3 = 0xabad1dea,
.size = sizeof(struct open_how_ext), .err = -E2BIG },
};
BUILD_BUG_ON(ARRAY_LEN(misalignments) != NUM_OPENAT2_STRUCT_VARIATIONS);
BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_STRUCT_TESTS);
for (int i = 0; i < ARRAY_LEN(tests); i++) {
struct struct_test *test = &tests[i];
struct open_how_ext how_ext = test->arg;
for (int j = 0; j < ARRAY_LEN(misalignments); j++) {
int fd, misalign = misalignments[j];
char *fdpath = NULL;
bool failed;
void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
void *copy = NULL, *how_copy = &how_ext;
if (!openat2_supported) {
ksft_print_msg("openat2(2) unsupported\n");
resultfn = ksft_test_result_skip;
goto skip;
}
if (misalign) {
/*
* Explicitly misalign the structure copying it with the given
* (mis)alignment offset. The other data is set to be non-zero to
* make sure that non-zero bytes outside the struct aren't checked
*
* This is effectively to check that is_zeroed_user() works.
*/
copy = malloc(misalign + sizeof(how_ext));
how_copy = copy + misalign;
memset(copy, 0xff, misalign);
memcpy(how_copy, &how_ext, sizeof(how_ext));
}
fd = raw_openat2(AT_FDCWD, ".", how_copy, test->size);
if (test->err >= 0)
failed = (fd < 0);
else
failed = (fd != test->err);
if (fd >= 0) {
fdpath = fdreadlink(fd);
close(fd);
}
if (failed) {
resultfn = ksft_test_result_fail;
ksft_print_msg("openat2 unexpectedly returned ");
if (fdpath)
ksft_print_msg("%d['%s']\n", fd, fdpath);
else
ksft_print_msg("%d (%s)\n", fd, strerror(-fd));
}
skip:
if (test->err >= 0)
resultfn("openat2 with %s argument [misalign=%d] succeeds\n",
test->name, misalign);
else
resultfn("openat2 with %s argument [misalign=%d] fails with %d (%s)\n",
test->name, misalign, test->err,
strerror(-test->err));
free(copy);
free(fdpath);
fflush(stdout);
}
}
}
struct flag_test {
const char *name;
struct open_how how;
int err;
};
#define NUM_OPENAT2_FLAG_TESTS 23
void test_openat2_flags(void)
{
struct flag_test tests[] = {
/* O_TMPFILE is incompatible with O_PATH and O_CREAT. */
{ .name = "incompatible flags (O_TMPFILE | O_PATH)",
.how.flags = O_TMPFILE | O_PATH | O_RDWR, .err = -EINVAL },
{ .name = "incompatible flags (O_TMPFILE | O_CREAT)",
.how.flags = O_TMPFILE | O_CREAT | O_RDWR, .err = -EINVAL },
/* O_PATH only permits certain other flags to be set ... */
{ .name = "compatible flags (O_PATH | O_CLOEXEC)",
.how.flags = O_PATH | O_CLOEXEC },
{ .name = "compatible flags (O_PATH | O_DIRECTORY)",
.how.flags = O_PATH | O_DIRECTORY },
{ .name = "compatible flags (O_PATH | O_NOFOLLOW)",
.how.flags = O_PATH | O_NOFOLLOW },
/* ... and others are absolutely not permitted. */
{ .name = "incompatible flags (O_PATH | O_RDWR)",
.how.flags = O_PATH | O_RDWR, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_CREAT)",
.how.flags = O_PATH | O_CREAT, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_EXCL)",
.how.flags = O_PATH | O_EXCL, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_NOCTTY)",
.how.flags = O_PATH | O_NOCTTY, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_DIRECT)",
.how.flags = O_PATH | O_DIRECT, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_LARGEFILE)",
.how.flags = O_PATH | O_LARGEFILE, .err = -EINVAL },
/* ->mode must only be set with O_{CREAT,TMPFILE}. */
{ .name = "non-zero how.mode and O_RDONLY",
.how.flags = O_RDONLY, .how.mode = 0600, .err = -EINVAL },
{ .name = "non-zero how.mode and O_PATH",
.how.flags = O_PATH, .how.mode = 0600, .err = -EINVAL },
{ .name = "valid how.mode and O_CREAT",
.how.flags = O_CREAT, .how.mode = 0600 },
{ .name = "valid how.mode and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR, .how.mode = 0600 },
/* ->mode must only contain 0777 bits. */
{ .name = "invalid how.mode and O_CREAT",
.how.flags = O_CREAT,
.how.mode = 0xFFFF, .err = -EINVAL },
{ .name = "invalid (very large) how.mode and O_CREAT",
.how.flags = O_CREAT,
.how.mode = 0xC000000000000000ULL, .err = -EINVAL },
{ .name = "invalid how.mode and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR,
.how.mode = 0x1337, .err = -EINVAL },
{ .name = "invalid (very large) how.mode and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR,
.how.mode = 0x0000A00000000000ULL, .err = -EINVAL },
/* ->resolve must only contain RESOLVE_* flags. */
{ .name = "invalid how.resolve and O_RDONLY",
.how.flags = O_RDONLY,
.how.resolve = 0x1337, .err = -EINVAL },
{ .name = "invalid how.resolve and O_CREAT",
.how.flags = O_CREAT,
.how.resolve = 0x1337, .err = -EINVAL },
{ .name = "invalid how.resolve and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR,
.how.resolve = 0x1337, .err = -EINVAL },
{ .name = "invalid how.resolve and O_PATH",
.how.flags = O_PATH,
.how.resolve = 0x1337, .err = -EINVAL },
};
BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_FLAG_TESTS);
for (int i = 0; i < ARRAY_LEN(tests); i++) {
int fd, fdflags = -1;
char *path, *fdpath = NULL;
bool failed = false;
struct flag_test *test = &tests[i];
void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
if (!openat2_supported) {
ksft_print_msg("openat2(2) unsupported\n");
resultfn = ksft_test_result_skip;
goto skip;
}
path = (test->how.flags & O_CREAT) ? "/tmp/ksft.openat2_tmpfile" : ".";
unlink(path);
fd = sys_openat2(AT_FDCWD, path, &test->how);
if (test->err >= 0)
failed = (fd < 0);
else
failed = (fd != test->err);
if (fd >= 0) {
int otherflags;
fdpath = fdreadlink(fd);
fdflags = fcntl(fd, F_GETFL);
otherflags = fcntl(fd, F_GETFD);
close(fd);
E_assert(fdflags >= 0, "fcntl F_GETFL of new fd");
E_assert(otherflags >= 0, "fcntl F_GETFD of new fd");
/* O_CLOEXEC isn't shown in F_GETFL. */
if (otherflags & FD_CLOEXEC)
fdflags |= O_CLOEXEC;
/* O_CREAT is hidden from F_GETFL. */
if (test->how.flags & O_CREAT)
fdflags |= O_CREAT;
if (!(test->how.flags & O_LARGEFILE))
fdflags &= ~O_LARGEFILE;
failed |= (fdflags != test->how.flags);
}
if (failed) {
resultfn = ksft_test_result_fail;
ksft_print_msg("openat2 unexpectedly returned ");
if (fdpath)
ksft_print_msg("%d['%s'] with %X (!= %X)\n",
fd, fdpath, fdflags,
test->how.flags);
else
ksft_print_msg("%d (%s)\n", fd, strerror(-fd));
}
skip:
if (test->err >= 0)
resultfn("openat2 with %s succeeds\n", test->name);
else
resultfn("openat2 with %s fails with %d (%s)\n",
test->name, test->err, strerror(-test->err));
free(fdpath);
fflush(stdout);
}
}
#define NUM_TESTS (NUM_OPENAT2_STRUCT_VARIATIONS * NUM_OPENAT2_STRUCT_TESTS + \
NUM_OPENAT2_FLAG_TESTS)
int main(int argc, char **argv)
{
ksft_print_header();
ksft_set_plan(NUM_TESTS);
test_openat2_struct();
test_openat2_flags();
if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0)
ksft_exit_fail();
else
ksft_exit_pass();
}
|
