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#!/bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2019 Peter Holm
#
# 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.
#
# minherit() test scenario inspired by Jeff's collapse.sh test.
# No problems seen.
. ../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/minherit.c
mycc -o minherit -Wall -Wextra -O0 -g minherit.c || exit 1
rm -f minherit.c
cd $odir
(cd $odir/../testcases/swap; ./swap -t 5m -i 10 -l 50) &
pid=$!
cd /tmp
$dir/minherit
s=$?
while pkill swap; do :; done
wait $oid
[ -f minherit.core -a $s -eq 0 ] &&
{ ls -l minherit.core; mv minherit.core $dir; s=1; }
cd $odir
rm -rf $dir/minherit
exit $s
EOF
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static _Atomic(int) *share;
#define ADRSPACE (1024 * 1024)
#define CHILDREN 200
#define PARALLEL 10
#define RUNTIME (5 * 60)
#define SYNC 0
static void
test(void)
{
pid_t pids[CHILDREN];
off_t len;
void *p;
int i, ix, j, n, shared;
char *cp;
(void)atomic_fetch_add(&share[SYNC], 1);
while (atomic_load(&share[SYNC]) != PARALLEL)
;
if ((p = mmap(NULL, ADRSPACE, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANON, -1, 0)) == MAP_FAILED) {
if (errno == ENOMEM)
return;
err(1, "mmap()");
}
/* Pick a random bit of address space to change inherit on. */
for (i = 0; i < ADRSPACE; i += len) {
shared = arc4random() & 0x1;
len = roundup2(arc4random() % ((ADRSPACE - i) / 4),
PAGE_SIZE);
if (minherit(p + i, len, shared ? INHERIT_SHARE :
INHERIT_COPY) != 0)
err(1, "minherit");
}
n = arc4random() % CHILDREN + 1;
for (i = 0; i < n; i++) {
pids[i] = fork();
if (pids[i] == -1)
err(1, "fork()");
if (pids[i] == 0) {
usleep(arc4random() % 100);
for (j = 0; j < 10; j++) {
cp = p;
for (ix = 0; ix < ADRSPACE; ix += PAGE_SIZE) {
cp[ix] = 1;
if (arc4random() % 100 < 5)
usleep(arc4random() % 50);
}
}
_exit(0);
}
}
for (i = 0; i < n; i++) {
if (waitpid(pids[i], NULL, 0) == -1)
err(1, "waitpid(%d)", pids[i]);
}
_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");
start = time(NULL);
while ((time(NULL) - start) < RUNTIME && e == 0) {
share[SYNC] = 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;
break;
}
}
}
return (e);
}
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