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#!/bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2019 Dell EMC Isilon
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Regression test for https://reviews.freebsd.org/D20784
# "Fix mutual exclusion in pipe_direct_write()"
# https://people.freebsd.org/~pho/stress/log/mkfifo8.txt
# Reported by syzbot+21811cc0a89b2a87a9e7@syzkaller.appspotmail.com
# Test scenario suggestion by markj@
# Fixed by r349546
. ../default.cfg
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
dir=/tmp
odir=`pwd`
cd $dir
sed '1,/^EOF/d' < $odir/$0 > $dir/mkfifo8.c
mycc -o mkfifo8 -Wall -Wextra -O0 -g mkfifo8.c || exit 1
rm -f mkfifo8.c
cd $odir
set -e
mount | grep -q "on $mntpoint " && umount -f $mntpoint
[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart
mdconfig -a -t swap -s 1g -u $mdstart
newfs $newfs_flags /dev/md$mdstart > /dev/null
mount /dev/md$mdstart $mntpoint
set +e
cd $mntpoint
$dir/mkfifo8; s=$?
cd $odir
while mount | grep -q "on $mntpoint "; do
umount $mntpoint || sleep 1
done
mdconfig -d -u $mdstart
rm -rf /tmp/mkfifo8
exit $s
EOF
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <machine/atomic.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define ACT 1
#define NPROCS 64
#define PARALLEL 4
#define RUNTIME 60
#define SIZ 8192
#define SYNC 0
static volatile u_int *share;
static int fd;
static char cp[SIZ];
static void
tw(void)
{
int r;
atomic_add_int(&share[ACT], 1);
r = write(fd, cp, SIZ);
if (r == -1)
warn("write");
_exit(0);
}
static void
tr(void)
{
int i, r;
char cp[SIZ];
while (share[ACT] < NPROCS / 2)
usleep(10);
for (i = 0; i < NPROCS; i++) {
r = read(fd, cp, SIZ);
if (r == -1)
warn("read");
}
_exit(0);
}
static void
test(void)
{
pid_t pid[NPROCS + 1];
int i;
char file[80];
atomic_add_int(&share[SYNC], 1);
while (share[SYNC] != PARALLEL)
;
snprintf(file, sizeof(file), "fifo.%d", getpid());
if (mkfifo(file, DEFFILEMODE) == -1)
err(1, "mkfifo(%s)", file);
if ((fd = open(file, O_RDWR)) == -1)
err(1, "open(%s)", file);
for (i = 0; i < NPROCS; i++) {
if ((pid[i] = fork()) == 0)
tw();
}
if ((pid[NPROCS] = fork()) == 0)
tr();
for (i = 0; i < NPROCS + 1; i++) {
if (waitpid(pid[i], NULL, 0) != pid[i])
err(1, "waitpid");
}
close(fd);
unlink(file);
_exit(0);
}
int
main(void)
{
pid_t pids[PARALLEL];
size_t len;
time_t start;
int e, i, status;
e = 0;
len = PAGE_SIZE;
if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED)
err(1, "mmap");
for (i = 0; i < SIZ; i += PAGE_SIZE)
cp[i] = 1;
start = time(NULL);
while ((time(NULL) - start) < RUNTIME && e == 0) {
share[SYNC] = 0;
share[ACT] = 0;
for (i = 0; i < PARALLEL; i++) {
if ((pids[i] = fork()) == 0)
test();
if (pids[i] == -1)
err(1, "fork()");
}
for (i = 0; i < PARALLEL; i++) {
if (waitpid(pids[i], &status, 0) == -1)
err(1, "waitpid(%d)", pids[i]);
if (status != 0) {
if (WIFSIGNALED(status))
fprintf(stderr,
"pid %d exit signal %d\n",
pids[i], WTERMSIG(status));
}
e += status == 0 ? 0 : 1;
}
}
return (e);
}
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