1 /* Test disabling of rseq registration via tunable.
2 Copyright (C) 2021 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 <unistd.h>
26
27 #ifdef RSEQ_SIG
28
29 /* Check that rseq can be registered and has not been taken by glibc. */
30 static void
check_rseq_disabled(void)31 check_rseq_disabled (void)
32 {
33 struct pthread *pd = THREAD_SELF;
34
35 TEST_COMPARE (__rseq_flags, 0);
36 TEST_VERIFY ((char *) __thread_pointer () + __rseq_offset
37 == (char *) &pd->rseq_area);
38 TEST_COMPARE (__rseq_size, 0);
39 TEST_COMPARE ((int) pd->rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
40
41 int ret = syscall (__NR_rseq, &pd->rseq_area, sizeof (pd->rseq_area),
42 0, RSEQ_SIG);
43 if (ret == 0)
44 {
45 ret = syscall (__NR_rseq, &pd->rseq_area, sizeof (pd->rseq_area),
46 RSEQ_FLAG_UNREGISTER, RSEQ_SIG);
47 TEST_COMPARE (ret, 0);
48 pd->rseq_area.cpu_id = RSEQ_CPU_ID_REGISTRATION_FAILED;
49 }
50 else
51 {
52 TEST_VERIFY (errno != -EINVAL);
53 TEST_VERIFY (errno != -EBUSY);
54 }
55 }
56
57 static void *
thread_func(void * ignored)58 thread_func (void *ignored)
59 {
60 check_rseq_disabled ();
61 return NULL;
62 }
63
64 static void
proc_func(void * ignored)65 proc_func (void *ignored)
66 {
67 check_rseq_disabled ();
68 }
69
70 static int
do_test(void)71 do_test (void)
72 {
73 puts ("info: checking main thread");
74 check_rseq_disabled ();
75
76 puts ("info: checking main thread (2)");
77 check_rseq_disabled ();
78
79 puts ("info: checking new thread");
80 xpthread_join (xpthread_create (NULL, thread_func, NULL));
81
82 puts ("info: checking subprocess");
83 support_isolate_in_subprocess (proc_func, NULL);
84
85 return 0;
86 }
87 #else /* !RSEQ_SIG */
88 static int
do_test(void)89 do_test (void)
90 {
91 FAIL_UNSUPPORTED ("glibc does not define RSEQ_SIG, skipping test");
92 }
93 #endif
94
95 #include <support/test-driver.c>
96