103 lines
2.7 KiB
Bash
103 lines
2.7 KiB
Bash
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#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (c) 2019 Dell EMC Isilon
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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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# "panic: Most recently used by tty" seen.
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# Reported by syzbot+c9b6206303bf47bac87e@syzkaller.appspotmail.com
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# Fixed by r349733
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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kldstat -v | grep -q pty || { kldload pty || exit 0; }
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. ../default.cfg
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here=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $here/$0 > pts3.c
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mycc -o pts3 -Wall -Wextra -O2 pts3.c || exit 1
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rm -f pts3.c
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/tmp/pts3; s=$?
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rm -f /tmp/pts3
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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/mman.h>
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#include <sys/wait.h>
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#include <machine/atomic.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 <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 volatile u_int *share;
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#define SYNC 0
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int
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main(void)
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{
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pid_t p, pid;
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size_t len;
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time_t start;
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int fd;
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char path[128];
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len = PAGE_SIZE;
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if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED)
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err(1, "mmap");
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p = getpid();
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sprintf(path, "/dev/ptmx");
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start = time(NULL);
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while (time(NULL) - start < 60) {
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share[SYNC] = 0;
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if ((fd = open(path, O_RDWR)) == -1)
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err(1,"open()");
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if ((pid = fork()) == 0) {
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while (share[SYNC] == 0)
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;
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_exit(0);
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}
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share[SYNC] = 1;
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if (fcntl(fd, F_SETOWN, p) == -1)
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warn("fcntl()");
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close(fd);
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if (waitpid(pid, NULL, 0) != pid)
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err(1, "waitpid()");
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}
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return (0);
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}
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