1 /* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
2 Copyright (C) 2021 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
37 static int sig;
38 static int pipefd[2];
39
40 static int
f(void * a)41 f (void *a)
42 {
43 close (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
60 static int
do_test(void)61 do_test (void)
62 {
63 sig = SIGRTMIN;
64 sigset_t ss;
65 sigemptyset (&ss);
66 sigaddset (&ss, sig);
67 if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
68 FAIL_EXIT1 ("sigprocmask failed: %m");
69
70 if (pipe2 (pipefd, O_CLOEXEC))
71 FAIL_EXIT1 ("pipe failed: %m");
72
73 #ifdef __ia64__
74 # define STACK_SIZE 256 * 1024
75 #else
76 # define STACK_SIZE 128 * 1024
77 #endif
78 char st[STACK_SIZE] __attribute__ ((aligned));
79 struct clone_args clone_args =
80 {
81 .stack = (uintptr_t) st,
82 .stack_size = sizeof (st),
83 };
84 pid_t p = __clone_internal (&clone_args, f, 0);
85
86 close (pipefd[1]);
87
88 if (p == -1)
89 FAIL_EXIT1("clone failed: %m");
90
91 pid_t ppid, pid, tid;
92 if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
93 {
94 kill (p, SIGKILL);
95 FAIL_EXIT1 ("read ppid failed: %m");
96 }
97 if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
98 {
99 kill (p, SIGKILL);
100 FAIL_EXIT1 ("read pid failed: %m");
101 }
102 if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
103 {
104 kill (p, SIGKILL);
105 FAIL_EXIT1 ("read tid failed: %m");
106 }
107
108 close (pipefd[0]);
109
110 pid_t own_pid = getpid ();
111 pid_t own_tid = syscall (__NR_gettid);
112
113 /* Some sanity checks for clone syscall: returned ppid should be current
114 pid and both returned tid/pid should be different from current one. */
115 if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
116 FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
117 (int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
118
119 int e;
120 xwaitpid (p, &e, __WCLONE);
121 TEST_VERIFY (WIFEXITED (e));
122 TEST_COMPARE (WEXITSTATUS (e), 0);
123 return 0;
124 }
125
126 #include <support/test-driver.c>
127