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
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
|
//===-- Unittests for sched_{set,get}{scheduler,param} --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/errno/libc_errno.h"
#include "src/sched/sched_get_priority_max.h"
#include "src/sched/sched_get_priority_min.h"
#include "src/sched/sched_getparam.h"
#include "src/sched/sched_getscheduler.h"
#include "src/sched/sched_setparam.h"
#include "src/sched/sched_setscheduler.h"
#include "src/unistd/getuid.h"
#include "test/UnitTest/Test.h"
#include <sched.h>
// We Test:
// SCHED_OTHER, SCHED_FIFO, SCHED_RR
//
// TODO: Missing two tests.
// 1) Missing permissions -> EPERM. Maybe doable by finding
// another pid that exists and changing its policy, but that
// seems risky. Maybe something with fork/clone would work.
//
// 2) Unkown pid -> ESRCH. Probably safe to choose a large range
// number or scanning current pids and getting one that doesn't
// exist, but again seems like it may risk actually changing
// sched policy on a running task.
//
// Linux specific test could also include:
// SCHED_BATCH, SCHED_ISO, SCHED_IDLE, SCHED_DEADLINE
TEST(LlvmLibcSchedParamAndSchedulerTest, SchedOtherTest) {
libc_errno = 0;
int policy = SCHED_OTHER;
bool can_set = true;
int init_policy = __llvm_libc::sched_getscheduler(0);
ASSERT_GE(init_policy, 0);
ASSERT_EQ(libc_errno, 0);
int max_priority = __llvm_libc::sched_get_priority_max(policy);
ASSERT_GE(max_priority, 0);
ASSERT_EQ(libc_errno, 0);
int min_priority = __llvm_libc::sched_get_priority_min(policy);
ASSERT_GE(min_priority, 0);
ASSERT_EQ(libc_errno, 0);
struct sched_param param = {min_priority};
// Negative pid
ASSERT_EQ(__llvm_libc::sched_setscheduler(-1, policy, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getscheduler(-1), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Invalid Policy
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy | 128, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Out of bounds priority
param.sched_priority = min_priority - 1;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
param.sched_priority = max_priority + 1;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), -1);
// A bit hard to test as depending if we are root or not we can run into
// different issues.
ASSERT_TRUE(libc_errno == EINVAL || libc_errno == EPERM);
libc_errno = 0;
// Some sched policies require permissions, so skip
param.sched_priority = min_priority;
// Success / missing permissions.
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m),
can_set ? 0 : -1);
ASSERT_TRUE(can_set ? (libc_errno == 0)
: (libc_errno == EINVAL || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getscheduler(0), can_set ? policy : init_policy);
ASSERT_EQ(libc_errno, 0);
// Out of bounds priority
param.sched_priority = -1;
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
param.sched_priority = max_priority + 1;
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
for (int priority = min_priority; priority <= max_priority; ++priority) {
ASSERT_EQ(__llvm_libc::sched_getparam(0, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
int init_priority = param.sched_priority;
param.sched_priority = priority;
// Negative pid
ASSERT_EQ(__llvm_libc::sched_setparam(-1, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(-1, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Success / missing permissions
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), can_set ? 0 : -1);
ASSERT_TRUE(can_set ? (libc_errno == 0)
: (libc_errno == EINVAL || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(0, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
ASSERT_EQ(param.sched_priority, can_set ? priority : init_priority);
}
// Null test
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, nullptr), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
}
TEST(LlvmLibcSchedParamAndSchedulerTest, SchedFIFOTest) {
libc_errno = 0;
int policy = SCHED_FIFO;
bool can_set = __llvm_libc::getuid() == 0;
int init_policy = __llvm_libc::sched_getscheduler(0);
ASSERT_GE(init_policy, 0);
ASSERT_EQ(libc_errno, 0);
int max_priority = __llvm_libc::sched_get_priority_max(policy);
ASSERT_GE(max_priority, 0);
ASSERT_EQ(libc_errno, 0);
int min_priority = __llvm_libc::sched_get_priority_min(policy);
ASSERT_GE(min_priority, 0);
ASSERT_EQ(libc_errno, 0);
struct sched_param param = {min_priority};
// Negative pid
ASSERT_EQ(__llvm_libc::sched_setscheduler(-1, policy, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getscheduler(-1), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Invalid Policy
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy | 128, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Out of bounds priority
param.sched_priority = min_priority - 1;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
param.sched_priority = max_priority + 1;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), -1);
// A bit hard to test as depending if we are root or not we can run into
// different issues.
ASSERT_TRUE(libc_errno == EINVAL || libc_errno == EPERM);
libc_errno = 0;
// Some sched policies require permissions, so skip
param.sched_priority = min_priority;
// Success / missing permissions.
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m),
can_set ? 0 : -1);
ASSERT_TRUE(can_set ? (libc_errno == 0)
: (libc_errno == EINVAL || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getscheduler(0), can_set ? policy : init_policy);
ASSERT_EQ(libc_errno, 0);
// Out of bounds priority
param.sched_priority = -1;
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
param.sched_priority = max_priority + 1;
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
for (int priority = min_priority; priority <= max_priority; ++priority) {
ASSERT_EQ(__llvm_libc::sched_getparam(0, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
int init_priority = param.sched_priority;
param.sched_priority = priority;
// Negative pid
ASSERT_EQ(__llvm_libc::sched_setparam(-1, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(-1, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Success / missing permissions
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), can_set ? 0 : -1);
ASSERT_TRUE(can_set ? (libc_errno == 0)
: (libc_errno == EINVAL || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(0, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
ASSERT_EQ(param.sched_priority, can_set ? priority : init_priority);
}
// Null test
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, nullptr), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
}
TEST(LlvmLibcSchedParamAndSchedulerTest, SchedRRTest) {
libc_errno = 0;
int policy = SCHED_RR;
bool can_set = __llvm_libc::getuid() == 0;
int init_policy = __llvm_libc::sched_getscheduler(0);
ASSERT_GE(init_policy, 0);
ASSERT_EQ(libc_errno, 0);
int max_priority = __llvm_libc::sched_get_priority_max(policy);
ASSERT_GE(max_priority, 0);
ASSERT_EQ(libc_errno, 0);
int min_priority = __llvm_libc::sched_get_priority_min(policy);
ASSERT_GE(min_priority, 0);
ASSERT_EQ(libc_errno, 0);
struct sched_param param = {min_priority};
// Negative pid
ASSERT_EQ(__llvm_libc::sched_setscheduler(-1, policy, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getscheduler(-1), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Invalid Policy
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy | 128, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Out of bounds priority
param.sched_priority = min_priority - 1;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
param.sched_priority = max_priority + 1;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), -1);
// A bit hard to test as depending if we are root or not we can run into
// different issues.
ASSERT_TRUE(libc_errno == EINVAL || libc_errno == EPERM);
libc_errno = 0;
// Some sched policies require permissions, so skip
param.sched_priority = min_priority;
// Success / missing permissions.
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m),
can_set ? 0 : -1);
ASSERT_TRUE(can_set ? (libc_errno == 0)
: (libc_errno == EINVAL || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getscheduler(0), can_set ? policy : init_policy);
ASSERT_EQ(libc_errno, 0);
// Out of bounds priority
param.sched_priority = -1;
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
param.sched_priority = max_priority + 1;
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
for (int priority = min_priority; priority <= max_priority; ++priority) {
ASSERT_EQ(__llvm_libc::sched_getparam(0, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
int init_priority = param.sched_priority;
param.sched_priority = priority;
// Negative pid
ASSERT_EQ(__llvm_libc::sched_setparam(-1, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(-1, ¶m), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
// Success / missing permissions
ASSERT_EQ(__llvm_libc::sched_setparam(0, ¶m), can_set ? 0 : -1);
ASSERT_TRUE(can_set ? (libc_errno == 0)
: (libc_errno == EINVAL || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(0, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
ASSERT_EQ(param.sched_priority, can_set ? priority : init_priority);
}
// Null test
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, nullptr), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
}
TEST(LlvmLibcSchedParamAndSchedulerTest, NullParamTest) {
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_setparam(0, nullptr), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
ASSERT_EQ(__llvm_libc::sched_getparam(0, nullptr), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
}
|
