1 /*
2 * Check handling of CLONE_PTRACE'ed processes.
3 *
4 * Copyright (c) 2015-2017 The strace developers.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31
32 #include <errno.h>
33 #include <sched.h>
34 #include <signal.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <sys/wait.h>
39 #include <unistd.h>
40
41 static siginfo_t sinfo;
42
43 static void
handler(const int no,siginfo_t * const si,void * const uc)44 handler(const int no, siginfo_t *const si, void *const uc)
45 {
46 memcpy(&sinfo, si, sizeof(sinfo));
47 }
48
49 static int
child(void * const arg)50 child(void *const arg)
51 {
52 for(;;)
53 pause();
54 return 0;
55 }
56
57 #define child_stack_size (get_page_size() / 2)
58
59 #ifdef IA64
60 extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...);
61 # define clone(fn, child_stack, flags, arg) \
62 __clone2(fn, child_stack, child_stack_size, flags, arg)
63 #endif
64
65 int
main(void)66 main(void)
67 {
68 const int sig = SIGUSR1;
69 sigset_t mask;
70 sigemptyset(&mask);
71 sigaddset(&mask, sig);
72 if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
73 perror_msg_and_fail("sigprocmask");
74
75 const pid_t pid = clone(child, tail_alloc(child_stack_size),
76 CLONE_PTRACE | SIGCHLD, 0);
77 if (pid < 0)
78 perror_msg_and_fail("clone");
79
80 static const struct sigaction sa = {
81 .sa_sigaction = handler,
82 .sa_flags = SA_SIGINFO
83 };
84 if (sigaction(SIGCHLD, &sa, NULL))
85 perror_msg_and_fail("sigaction");
86
87 kill(pid, sig);
88
89 FILE *const fp = fdopen(3, "a");
90 if (!fp)
91 perror_msg_and_fail("fdopen");
92 if (fprintf(fp, "%s: Detached unknown pid %d\n",
93 getenv("STRACE_EXE") ?: "strace", pid) < 0)
94 perror_msg_and_fail("fprintf");
95
96 int status;
97 while (wait(&status) != pid) {
98 if (errno != EINTR)
99 perror_msg_and_fail("wait");
100 }
101 if (!WIFSIGNALED(status) || WTERMSIG(status) != sig)
102 error_msg_and_fail("unexpected child exit status %d", status);
103
104 printf("--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=%d"
105 ", si_uid=%u, si_status=%s, si_utime=%u, si_stime=%u} ---\n"
106 "+++ exited with 0 +++\n", pid, geteuid(), "SIGUSR1",
107 (unsigned int) sinfo.si_utime, (unsigned int) sinfo.si_stime);
108
109 return 0;
110 }
111