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
|
/*
* Check decoding of signal syscall.
*
* Copyright (c) 2017-2018 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2017-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#ifdef __NR_signal
# include <errno.h>
# include <signal.h>
# include <stdio.h>
# include <stdint.h>
# include <string.h>
# include <unistd.h>
static long
k_signal(const kernel_ulong_t signum, const kernel_ulong_t handler)
{
return syscall(__NR_signal, signum, handler);
}
int
main(void)
{
static const uintptr_t sig_ign = (uintptr_t) SIG_IGN;
static const uintptr_t sig_dfl = (uintptr_t) SIG_DFL;
static const kernel_ulong_t sigusr1 =
(kernel_ulong_t) 0xfacefeed00000000ULL | SIGUSR1;
static const struct sigaction act = { .sa_handler = SIG_DFL };
long rc;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &mask, NULL))
perror_msg_and_fail("sigprocmask SIG_BLOCK");
if (sigaction(SIGUSR1, &act, NULL))
perror_msg_and_fail("sigaction");
rc = k_signal(sigusr1, sig_ign);
if (rc == -1L) {
printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
} else if (rc != (long) sig_dfl) {
error_msg_and_fail("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
} else {
printf("signal(SIGUSR1, SIG_IGN) = %#lx (SIG_DFL)\n", rc);
/*
* Raise and unblock SIGUSR1.
* If signal syscall failed to set SIGUSR1 handler to SIG_IGN,
* the process will be terminated by SIGUSR1.
*/
raise(SIGUSR1);
if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
perror_msg_and_fail("sigprocmask SIG_UNBLOCK");
if (sigprocmask(SIG_BLOCK, &mask, NULL))
perror_msg_and_fail("sigprocmask SIG_BLOCK");
}
rc = k_signal(SIGUSR1, sig_dfl);
if (rc == -1L) {
printf("signal(SIGUSR1, SIG_DFL) = %s\n", sprintrc(rc));
} else if (rc != (long) sig_ign) {
error_msg_and_fail("signal(SIGUSR1, SIG_DFL) = %#lx\n", rc);
} else {
printf("signal(SIGUSR1, SIG_DFL) = %#lx (SIG_IGN)\n", rc);
}
const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
rc = k_signal(SIGUSR1, addr);
if (rc == -1L) {
printf("signal(SIGUSR1, %#llx) = %s\n",
(unsigned long long) addr, sprintrc(rc));
} else if (rc != (long) sig_dfl) {
error_msg_and_fail("signal(SIGUSR1, %#llx) = %#lx\n",
(unsigned long long) addr, rc);
} else {
printf("signal(SIGUSR1, %#llx) = %#lx (SIG_DFL)\n",
(unsigned long long) addr, rc);
}
rc = k_signal(SIGUSR1, sig_ign);
if (rc == -1L) {
printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
} else {
printf("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
}
rc = k_signal(addr, sig_ign);
printf("signal(%d, SIG_IGN) = %s\n", (int) addr, sprintrc(rc));
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_signal")
#endif
|
