1 | /* Test disabling of rseq registration via tunable. |
2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <stdio.h> |
20 | #include <support/check.h> |
21 | #include <support/namespace.h> |
22 | #include <support/xthread.h> |
23 | #include <sysdep.h> |
24 | #include <thread_pointer.h> |
25 | #include <sys/rseq.h> |
26 | #include <unistd.h> |
27 | |
28 | #ifdef RSEQ_SIG |
29 | |
30 | /* Check that rseq can be registered and has not been taken by glibc. */ |
31 | static void |
32 | check_rseq_disabled (void) |
33 | { |
34 | struct pthread *pd = THREAD_SELF; |
35 | |
36 | TEST_COMPARE (__rseq_flags, 0); |
37 | TEST_VERIFY ((char *) __thread_pointer () + __rseq_offset |
38 | == (char *) &pd->rseq_area); |
39 | TEST_COMPARE (__rseq_size, 0); |
40 | TEST_COMPARE ((int) pd->rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED); |
41 | |
42 | int ret = syscall (__NR_rseq, &pd->rseq_area, sizeof (pd->rseq_area), |
43 | 0, RSEQ_SIG); |
44 | if (ret == 0) |
45 | { |
46 | ret = syscall (__NR_rseq, &pd->rseq_area, sizeof (pd->rseq_area), |
47 | RSEQ_FLAG_UNREGISTER, RSEQ_SIG); |
48 | TEST_COMPARE (ret, 0); |
49 | pd->rseq_area.cpu_id = RSEQ_CPU_ID_REGISTRATION_FAILED; |
50 | } |
51 | else |
52 | { |
53 | TEST_VERIFY (errno != -EINVAL); |
54 | TEST_VERIFY (errno != -EBUSY); |
55 | } |
56 | } |
57 | |
58 | static void * |
59 | thread_func (void *ignored) |
60 | { |
61 | check_rseq_disabled (); |
62 | return NULL; |
63 | } |
64 | |
65 | static void |
66 | proc_func (void *ignored) |
67 | { |
68 | check_rseq_disabled (); |
69 | } |
70 | |
71 | static int |
72 | do_test (void) |
73 | { |
74 | puts (s: "info: checking main thread" ); |
75 | check_rseq_disabled (); |
76 | |
77 | puts (s: "info: checking main thread (2)" ); |
78 | check_rseq_disabled (); |
79 | |
80 | puts (s: "info: checking new thread" ); |
81 | xpthread_join (thr: xpthread_create (NULL, thread_func, NULL)); |
82 | |
83 | puts (s: "info: checking subprocess" ); |
84 | support_isolate_in_subprocess (callback: proc_func, NULL); |
85 | |
86 | return 0; |
87 | } |
88 | #else /* !RSEQ_SIG */ |
89 | static int |
90 | do_test (void) |
91 | { |
92 | FAIL_UNSUPPORTED ("glibc does not define RSEQ_SIG, skipping test" ); |
93 | } |
94 | #endif |
95 | |
96 | #include <support/test-driver.c> |
97 | |