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1/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
2 Copyright (C) 2016-2019 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 <http://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 <sys/types.h>
30#include <sys/wait.h>
31#include <sys/syscall.h>
32
33#include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
34
35#include <support/check.h>
36
37static int sig;
38static int pipefd[2];
39
40static int
41f (void *a)
42{
43 close (pipefd[0]);
44
45 pid_t ppid = getppid ();
46 pid_t pid = getpid ();
47 pid_t tid = syscall (__NR_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, &ss, NULL) != 0)
68 FAIL_EXIT1 ("sigprocmask failed: %m");
69
70 if (pipe2 (pipefd, O_CLOEXEC))
71 FAIL_EXIT1 ("pipe failed: %m");
72
73 int clone_flags = 0;
74#ifdef __ia64__
75 extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
76 size_t __child_stack_size, int __flags,
77 void *__arg, ...);
78 char st[256 * 1024] __attribute__ ((aligned));
79 pid_t p = __clone2 (f, st, sizeof (st), clone_flags, 0);
80#else
81 char st[128 * 1024] __attribute__ ((aligned));
82#if _STACK_GROWS_DOWN
83 pid_t p = clone (f, st + sizeof (st), clone_flags, 0);
84#elif _STACK_GROWS_UP
85 pid_t p = clone (f, st, clone_flags, 0);
86#else
87#error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
88#endif
89#endif
90
91 close (pipefd[1]);
92
93 if (p == -1)
94 FAIL_EXIT1("clone failed: %m");
95
96 pid_t ppid, pid, tid;
97 if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
98 {
99 kill (p, SIGKILL);
100 FAIL_EXIT1 ("read ppid failed: %m");
101 }
102 if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
103 {
104 kill (p, SIGKILL);
105 FAIL_EXIT1 ("read pid failed: %m");
106 }
107 if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
108 {
109 kill (p, SIGKILL);
110 FAIL_EXIT1 ("read tid failed: %m");
111 }
112
113 close (pipefd[0]);
114
115 int ret = 0;
116
117 pid_t own_pid = getpid ();
118 pid_t own_tid = syscall (__NR_gettid);
119
120 /* Some sanity checks for clone syscall: returned ppid should be current
121 pid and both returned tid/pid should be different from current one. */
122 if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
123 FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
124 (int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
125
126 int e;
127 if (waitpid (p, &e, __WCLONE) != p)
128 {
129 kill (p, SIGKILL);
130 FAIL_EXIT1 ("waitpid failed");
131 }
132 if (!WIFEXITED (e))
133 {
134 if (WIFSIGNALED (e))
135 printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
136 else
137 puts ("did not terminate correctly");
138 exit (EXIT_FAILURE);
139 }
140 if (WEXITSTATUS (e) != 0)
141 FAIL_EXIT1 ("exit code %d", WEXITSTATUS (e));
142
143 return ret;
144}
145
146#include <support/test-driver.c>
147

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