1/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
2 Copyright (C) 2021-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sched.h>
20#include <signal.h>
21#include <string.h>
22#include <stdio.h>
23#include <fcntl.h>
24#include <unistd.h>
25#include <stddef.h>
26#include <stdbool.h>
27#include <stdint.h>
28#include <stdlib.h>
29#include <errno.h>
30#include <sys/types.h>
31#include <sys/wait.h>
32#include <sys/syscall.h>
33#include <clone_internal.h>
34#include <support/xunistd.h>
35#include <support/check.h>
36
37static int sig;
38static int pipefd[2];
39
40static int
41f (void *a)
42{
43 close (fd: pipefd[0]);
44
45 pid_t ppid = getppid ();
46 pid_t pid = getpid ();
47 pid_t tid = gettid ();
48
49 if (write (pipefd[1], &ppid, sizeof ppid) != sizeof (ppid))
50 FAIL_EXIT1 ("write ppid failed\n");
51 if (write (pipefd[1], &pid, sizeof pid) != sizeof (pid))
52 FAIL_EXIT1 ("write pid failed\n");
53 if (write (pipefd[1], &tid, sizeof tid) != sizeof (tid))
54 FAIL_EXIT1 ("write tid failed\n");
55
56 return 0;
57}
58
59
60static int
61do_test (void)
62{
63 sig = SIGRTMIN;
64 sigset_t ss;
65 sigemptyset (&ss);
66 sigaddset (&ss, sig);
67 if (sigprocmask (SIG_BLOCK, set: &ss, NULL) != 0)
68 FAIL_EXIT1 ("sigprocmask failed: %m");
69
70 if (pipe2 (pipedes: pipefd, O_CLOEXEC))
71 FAIL_EXIT1 ("pipe failed: %m");
72
73#define STACK_SIZE 128 * 1024
74 char st[STACK_SIZE] __attribute__ ((aligned));
75 struct clone_args clone_args =
76 {
77 .stack = (uintptr_t) st,
78 .stack_size = sizeof (st),
79 };
80 pid_t p = __clone_internal (&clone_args, f, 0);
81
82 close (fd: pipefd[1]);
83
84 if (p == -1)
85 FAIL_EXIT1("clone failed: %m");
86
87 pid_t ppid, pid, tid;
88 if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
89 {
90 kill (pid: p, SIGKILL);
91 FAIL_EXIT1 ("read ppid failed: %m");
92 }
93 if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
94 {
95 kill (pid: p, SIGKILL);
96 FAIL_EXIT1 ("read pid failed: %m");
97 }
98 if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
99 {
100 kill (pid: p, SIGKILL);
101 FAIL_EXIT1 ("read tid failed: %m");
102 }
103
104 close (fd: pipefd[0]);
105
106 pid_t own_pid = getpid ();
107 pid_t own_tid = syscall (__NR_gettid);
108
109 /* Some sanity checks for clone syscall: returned ppid should be current
110 pid and both returned tid/pid should be different from current one. */
111 if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
112 FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
113 (int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
114
115 int e;
116 xwaitpid (p, status: &e, __WCLONE);
117 TEST_VERIFY (WIFEXITED (e));
118 TEST_COMPARE (WEXITSTATUS (e), 0);
119 return 0;
120}
121
122#include <support/test-driver.c>
123

source code of glibc/sysdeps/unix/sysv/linux/tst-clone2-internal.c