8a272653d9
Discussed with: kib
239 lines
5.9 KiB
Bash
Executable File
239 lines
5.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2016 EMC Corp.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# It seems to be possible for ptrace(PT_ATTACH) to race with the delivery
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# of a signal to the same process.
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# $ while ./pt.sh; do date; done
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# 15. juli 2016 kl. 05.59.05 CEST
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# 15. juli 2016 kl. 06.03.07 CEST
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# UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND
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# 1001 863 862 0 44 0 13880 5268 wait Is 0 0:00,13 -bash (bash)
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# 1001 21053 863 0 52 0 13188 3088 wait I+ 0 0:00,01 /bin/sh ./pt.sh
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# 1001 21096 21053 0 52 0 10544 2308 wait I+ 0 0:00,00 /tmp/pt
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# 1001 21103 21096 0 20 0 12852 2456 wait S+ 0 0:00,00 pt: main (pt)
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# 1001 21103 21096 0 35 0 12852 2456 wait I+ 0 0:55,30 pt: main (pt)
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# 1001 21104 21096 0 72 0 0 0 - Z+ 0 0:00,00 <defunct>
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# 1001 21105 21096 0 72 0 0 0 - Z+ 0 0:00,00 <defunct>
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# 1001 21116 21103 0 103 0 10544 2336 - RX+ 0 4:22,41 pt: spinner (pt)
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# 1001 37711 21103 0 20 0 21200 2960 - R+ 0 0:00,00 ps -Hl
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# 1001 890 879 0 20 0 22184 6196 select Ss+ 1 1:21,86 top -s 1
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# 1001 85222 85221 0 21 0 13880 5276 ttyin Is+ 2 0:00,23 -bash (bash)
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# SIGALRM state 2, pid 21116
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# $
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# Fixed by r303423.
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. ../default.cfg
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dir=/tmp
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odir=`pwd`
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cd $dir
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sed '1,/^EOF/d' < $odir/$0 > $dir/ptrace7.c
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mycc -o ptrace7 -Wall -Wextra -O0 -g ptrace7.c -pthread || exit 1
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rm -f ptrace7.c
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cd $odir
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/tmp/ptrace7
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s=$?
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while pgrep -q swap; do
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pkill -9 swap
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done
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rm -rf /tmp/ptrace7
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exit $s
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EOF
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#include <sys/param.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.h>
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#ifdef __FreeBSD__
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#include <pthread_np.h>
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#define __NP__
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#endif
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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static pid_t pid;
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static pthread_barrier_t barr;
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static int cont;
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static int state;
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#define PARALLEL 8
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#define RUNTIME (4 * 60)
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static void
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ahandler(int i __unused)
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{
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system("ps -Hl");
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fprintf(stderr, "SIGALRM state %d, pid %d\n", state, pid);
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exit(1);
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}
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static void
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handler(int i __unused)
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{
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}
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static void *
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t1(void *data __unused)
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{
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int status;
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#ifdef __NP__
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pthread_set_name_np(pthread_self(), __func__);
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#endif
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while (cont == 1) {
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state = 1;
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if (ptrace(PT_ATTACH, pid, 0, 0) == -1)
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err(1, "ptrace(%d)", pid);
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state = 2;
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if (waitpid(pid, &status, 0) == -1)
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err(1, "waitpid");
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else if (!WIFSTOPPED(status))
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errx(1, "failed to stop child");
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state = 3;
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if (ptrace(PT_DETACH, pid, 0, 0) == -1)
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err(1, "ptrace");
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state = 4;
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usleep(arc4random() % 100 + 50);
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}
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return (NULL);
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}
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static void *
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t2(void *data __unused)
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{
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#ifdef __NP__
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pthread_set_name_np(pthread_self(), __func__);
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#endif
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while (cont == 1) {
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if (kill(pid, SIGHUP) == -1)
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err(1, "kill");
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usleep(arc4random() % 100 + 50);
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}
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return (NULL);
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}
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static void
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test(void)
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{
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pthread_t tid[2];
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struct sigaction sa;
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int r, status;
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r = pthread_barrier_wait(&barr);
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if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
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errc(1, r, "pthread_barrier_wait");
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sa.sa_handler = ahandler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGALRM, &sa, NULL) == -1)
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err(1, "sigaction");
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alarm(RUNTIME + 60);
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sa.sa_handler = handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGHUP, &sa, NULL) == -1)
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err(1, "sigaction");
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setproctitle("%s", "spinner");
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if ((pid = fork()) == 0) {
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for(;;)
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getuid();
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_exit(0);
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}
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cont = 1;
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if ((r = pthread_create(&tid[0], NULL, t1, NULL)) == -1)
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errc(1, r, "pthread_create");
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if ((r = pthread_create(&tid[1], NULL, t2, NULL)) == -1)
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errc(1, r, "pthread_create");
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setproctitle("%s", "main");
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sleep(RUNTIME);
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cont = 0;
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if ((r = pthread_join(tid[0], NULL)) == -1)
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errc(1, r, "pthread_join");
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if ((r = pthread_join(tid[1], NULL)) == -1)
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errc(1, r, "pthread_join");
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if (kill(pid, SIGKILL) != 0)
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err(1, "kill(%d)", pid);
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if (waitpid(pid, &status, 0) == -1)
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err(1, "waitpid(%d)", pid);
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exit(0);
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}
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int
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main(void)
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{
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pthread_barrierattr_t attr;
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int e, i, pids[PARALLEL], r, status;
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if ((r = pthread_barrierattr_init(&attr)) != 0)
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errc(1, r, "pthread_barrierattr_init");
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if ((r = pthread_barrierattr_setpshared(&attr,
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PTHREAD_PROCESS_SHARED)) != 0)
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errc(1, r, "pthread_barrierattr_setpshared");
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if ((r = pthread_barrier_init(&barr, &attr, PARALLEL)) != 0)
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errc(1, r, "pthread_barrier_init");
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e = 0;
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for (i = 0; i < PARALLEL; i++) {
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if ((pids[i] = fork()) == 0)
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test();
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}
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for (i = 0; i < PARALLEL; i++) {
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if (waitpid(pids[i], &status, 0) == -1)
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err(1, "waitpid%d)", pids[i]);
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e += status == 0 ? 0 : 1;
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}
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if ((r = pthread_barrier_destroy(&barr)) > 0)
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errc(1, r, "pthread_barrier_destroy");
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return (e);
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}
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