1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2007
4 * 04/11/08 Veerendra C <[email protected]>
5 * Copyright (C) 2023 SUSE LLC Andrea Cervesato <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Clone a process with CLONE_NEWPID flag and verifies that siginfo->si_pid is
12 * set to 0 if sender (parent process) sent the signal. Then send signal from
13 * container itself and check if siginfo->si_pid is set to 1.
14 */
15
16 #define _GNU_SOURCE 1
17 #include <signal.h>
18 #include "tst_test.h"
19 #include "lapi/sched.h"
20
21 static volatile int signal_pid;
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 signal_pid = si->si_pid;
26 }
27
child_func(void)28 static void child_func(void)
29 {
30 struct sigaction sa;
31 pid_t cpid, ppid;
32
33 cpid = tst_getpid();
34 ppid = getppid();
35
36 TST_EXP_EQ_LI(cpid, 1);
37 TST_EXP_EQ_LI(ppid, 0);
38
39 tst_res(TINFO, "Catching SIGUSR1 signal");
40
41 sa.sa_flags = SA_SIGINFO;
42 SAFE_SIGFILLSET(&sa.sa_mask);
43 sa.sa_sigaction = child_signal_handler;
44 SAFE_SIGACTION(SIGUSR1, &sa, NULL);
45
46 TST_CHECKPOINT_WAKE_AND_WAIT(0);
47
48 TST_EXP_EQ_LI(signal_pid, 0);
49
50 tst_res(TINFO, "Sending SIGUSR1 from container itself");
51
52 SAFE_KILL(cpid, SIGUSR1);
53
54 TST_EXP_EQ_LI(signal_pid, 1);
55 }
56
run(void)57 static void run(void)
58 {
59 const struct tst_clone_args args = {
60 .flags = CLONE_NEWPID,
61 .exit_signal = SIGCHLD,
62 };
63 pid_t pid;
64
65 signal_pid = -1;
66
67 pid = SAFE_CLONE(&args);
68 if (!pid) {
69 child_func();
70 return;
71 }
72
73 TST_CHECKPOINT_WAIT(0);
74
75 tst_res(TINFO, "Sending SIGUSR1 from parent");
76
77 SAFE_KILL(pid, SIGUSR1);
78
79 TST_CHECKPOINT_WAKE(0);
80 }
81
82 static struct tst_test test = {
83 .test_all = run,
84 .needs_root = 1,
85 .needs_checkpoints = 1,
86 .forks_child = 1,
87 };
88