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cea81e2b FW |
1 | /* Test for user-after-free bug in pthread_getattr_default_np (bug 25999). |
2 | Copyright (C) 2020 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <pthread.h> | |
20 | #include <sched.h> | |
21 | #include <support/check.h> | |
22 | #include <support/xthread.h> | |
23 | ||
24 | static int | |
25 | do_test (void) | |
26 | { | |
27 | /* This is a typical affinity size. */ | |
28 | enum { cpu_count = 128 }; | |
29 | cpu_set_t *set = CPU_ALLOC (cpu_count); | |
30 | size_t set_size = CPU_ALLOC_SIZE (cpu_count); | |
31 | CPU_ZERO_S (set_size, set); | |
32 | CPU_SET (1, set); | |
33 | CPU_SET (3, set); | |
34 | ||
35 | /* Apply the affinity mask to the default attribute. */ | |
36 | pthread_attr_t attr; | |
37 | xpthread_attr_init (&attr); | |
38 | TEST_COMPARE (pthread_attr_setaffinity_np (&attr, set_size, set), 0); | |
39 | TEST_COMPARE (pthread_setattr_default_np (&attr), 0); | |
40 | xpthread_attr_destroy (&attr); | |
41 | ||
42 | /* Read back the default attribute and check affinity mask. */ | |
43 | pthread_getattr_default_np (&attr); | |
44 | CPU_ZERO_S (set_size, set); | |
45 | TEST_COMPARE (pthread_attr_getaffinity_np (&attr, set_size, set), 0); | |
46 | for (int i = 0; i < cpu_count; ++i) | |
47 | TEST_COMPARE (!!CPU_ISSET (i, set), i == 1 || i == 3); | |
48 | ||
49 | ||
50 | /* Apply a larger CPU affinity mask to the default attribute, to | |
51 | trigger reallocation. */ | |
52 | { | |
53 | cpu_set_t *large_set = CPU_ALLOC (4 * cpu_count); | |
54 | size_t large_set_size = CPU_ALLOC_SIZE (4 * cpu_count); | |
55 | CPU_ZERO_S (large_set_size, large_set); | |
56 | pthread_attr_t large_attr; | |
57 | xpthread_attr_init (&large_attr); | |
58 | TEST_COMPARE (pthread_attr_setaffinity_np (&large_attr, | |
59 | large_set_size, large_set), 0); | |
60 | TEST_COMPARE (pthread_setattr_default_np (&large_attr), 0); | |
61 | xpthread_attr_destroy (&large_attr); | |
62 | CPU_FREE (large_set); | |
63 | } | |
64 | ||
65 | /* Read back the default attribute and check affinity mask. */ | |
66 | CPU_ZERO_S (set_size, set); | |
67 | TEST_COMPARE (pthread_attr_getaffinity_np (&attr, set_size, set), 0); | |
68 | for (int i = 0; i < cpu_count; ++i) | |
69 | TEST_COMPARE (!!CPU_ISSET (i, set), i == 1 || i == 3); | |
70 | /* Due to bug 25999, the following caused a double-free abort. */ | |
71 | xpthread_attr_destroy (&attr); | |
72 | ||
73 | CPU_FREE (set); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | #include <support/test-driver.c> |