1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #define _GNU_SOURCE
4 #include <errno.h>
5 #include <sched.h>
6 #include <signal.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <unistd.h>
11 #include <linux/sched.h>
12 #include <linux/types.h>
13 #include <sys/syscall.h>
14 #include <sys/wait.h>
15
16 #include "../kselftest.h"
17 #include "clone3_selftests.h"
18
19 #ifndef CLONE_CLEAR_SIGHAND
20 #define CLONE_CLEAR_SIGHAND 0x100000000ULL
21 #endif
22
nop_handler(int signo)23 static void nop_handler(int signo)
24 {
25 }
26
wait_for_pid(pid_t pid)27 static int wait_for_pid(pid_t pid)
28 {
29 int status, ret;
30
31 again:
32 ret = waitpid(pid, &status, 0);
33 if (ret == -1) {
34 if (errno == EINTR)
35 goto again;
36
37 return -1;
38 }
39
40 if (!WIFEXITED(status))
41 return -1;
42
43 return WEXITSTATUS(status);
44 }
45
test_clone3_clear_sighand(void)46 static void test_clone3_clear_sighand(void)
47 {
48 int ret;
49 pid_t pid;
50 struct __clone_args args = {};
51 struct sigaction act;
52
53 /*
54 * Check that CLONE_CLEAR_SIGHAND and CLONE_SIGHAND are mutually
55 * exclusive.
56 */
57 args.flags |= CLONE_CLEAR_SIGHAND | CLONE_SIGHAND;
58 args.exit_signal = SIGCHLD;
59 pid = sys_clone3(&args, sizeof(args));
60 if (pid > 0)
61 ksft_exit_fail_msg(
62 "clone3(CLONE_CLEAR_SIGHAND | CLONE_SIGHAND) succeeded\n");
63
64 act.sa_handler = nop_handler;
65 ret = sigemptyset(&act.sa_mask);
66 if (ret < 0)
67 ksft_exit_fail_msg("%s - sigemptyset() failed\n",
68 strerror(errno));
69
70 act.sa_flags = 0;
71
72 /* Register signal handler for SIGUSR1 */
73 ret = sigaction(SIGUSR1, &act, NULL);
74 if (ret < 0)
75 ksft_exit_fail_msg(
76 "%s - sigaction(SIGUSR1, &act, NULL) failed\n",
77 strerror(errno));
78
79 /* Register signal handler for SIGUSR2 */
80 ret = sigaction(SIGUSR2, &act, NULL);
81 if (ret < 0)
82 ksft_exit_fail_msg(
83 "%s - sigaction(SIGUSR2, &act, NULL) failed\n",
84 strerror(errno));
85
86 /* Check that CLONE_CLEAR_SIGHAND works. */
87 args.flags = CLONE_CLEAR_SIGHAND;
88 pid = sys_clone3(&args, sizeof(args));
89 if (pid < 0)
90 ksft_exit_fail_msg("%s - clone3(CLONE_CLEAR_SIGHAND) failed\n",
91 strerror(errno));
92
93 if (pid == 0) {
94 ret = sigaction(SIGUSR1, NULL, &act);
95 if (ret < 0)
96 exit(EXIT_FAILURE);
97
98 if (act.sa_handler != SIG_DFL)
99 exit(EXIT_FAILURE);
100
101 ret = sigaction(SIGUSR2, NULL, &act);
102 if (ret < 0)
103 exit(EXIT_FAILURE);
104
105 if (act.sa_handler != SIG_DFL)
106 exit(EXIT_FAILURE);
107
108 exit(EXIT_SUCCESS);
109 }
110
111 ret = wait_for_pid(pid);
112 if (ret)
113 ksft_exit_fail_msg(
114 "Failed to clear signal handler for child process\n");
115
116 ksft_test_result_pass("Cleared signal handlers for child process\n");
117 }
118
main(int argc,char ** argv)119 int main(int argc, char **argv)
120 {
121 ksft_print_header();
122 ksft_set_plan(1);
123 test_clone3_supported();
124
125 test_clone3_clear_sighand();
126
127 return ksft_exit_pass();
128 }
129