1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2007
4 * 13/11/08 Gowrishankar M <[email protected]>
5 * Copyright (C) 2022 SUSE LLC Andrea Cervesato <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Clone a process with CLONE_NEWPID flag, block SIGUSR1 signal before sending
12 * it from parent and check if it's received once SIGUSR1 signal is unblocked.
13 */
14
15 #define _GNU_SOURCE 1
16 #include <signal.h>
17 #include "tst_test.h"
18 #include "lapi/sched.h"
19
20 static volatile int signals;
21 static volatile int last_signo;
22
child_signal_handler(LTP_ATTRIBUTE_UNUSED int sig,siginfo_t * si,LTP_ATTRIBUTE_UNUSED void * unused)23 static void child_signal_handler(LTP_ATTRIBUTE_UNUSED int sig, siginfo_t *si, LTP_ATTRIBUTE_UNUSED void *unused)
24 {
25 last_signo = si->si_signo;
26 signals++;
27 }
28
child_func(void)29 static void child_func(void)
30 {
31 struct sigaction sa;
32 sigset_t newset;
33 pid_t cpid, ppid;
34
35 cpid = tst_getpid();
36 ppid = getppid();
37
38 if (cpid != 1 || ppid != 0) {
39 tst_res(TFAIL, "Got unexpected result of cpid=%d ppid=%d", cpid, ppid);
40 return;
41 }
42
43 SAFE_SIGEMPTYSET(&newset);
44 SAFE_SIGADDSET(&newset, SIGUSR1);
45 SAFE_SIGPROCMASK(SIG_BLOCK, &newset, 0);
46
47 TST_CHECKPOINT_WAKE_AND_WAIT(0);
48
49 sa.sa_flags = SA_SIGINFO;
50 SAFE_SIGFILLSET(&sa.sa_mask);
51 sa.sa_sigaction = child_signal_handler;
52
53 SAFE_SIGACTION(SIGUSR1, &sa, NULL);
54
55 SAFE_SIGPROCMASK(SIG_UNBLOCK, &newset, 0);
56
57 if (signals != 1) {
58 tst_res(TFAIL, "Received %d signals", signals);
59 return;
60 }
61
62 if (last_signo != SIGUSR1) {
63 tst_res(TFAIL, "Received %s signal", tst_strsig(last_signo));
64 return;
65 }
66
67 tst_res(TPASS, "Received SIGUSR1 signal after unblock");
68 }
69
run(void)70 static void run(void)
71 {
72 const struct tst_clone_args args = {
73 .flags = CLONE_NEWPID,
74 .exit_signal = SIGCHLD,
75 };
76 int pid;
77
78 pid = SAFE_CLONE(&args);
79 if (!pid) {
80 child_func();
81 return;
82 }
83
84 TST_CHECKPOINT_WAIT(0);
85
86 SAFE_KILL(pid, SIGUSR1);
87
88 TST_CHECKPOINT_WAKE(0);
89 }
90
91 static struct tst_test test = {
92 .test_all = run,
93 .needs_root = 1,
94 .forks_child = 1,
95 .needs_checkpoints = 1,
96 .needs_kconfigs = (const char *[]) {
97 "CONFIG_PID_NS",
98 NULL,
99 },
100 };
101