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