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148 lines
3.6 KiB
Bash
Executable file
148 lines
3.6 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2015 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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# Fork bomb memory leak test scenario.
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# https://en.wikipedia.org/wiki/Fork_bomb
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# OO memory seen:
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# https://people.freebsd.org/~pho/stress/log/forkbomb.txt
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# Fixed by r289026.
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. ../default.cfg
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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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/forkbomb.c
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mycc -o forkbomb -Wall -Wextra -O0 -g forkbomb.c || exit 1
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rm -f forkbomb.c
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cd $odir
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mount | grep "on $mntpoint " | grep -q /dev/md && umount -f $mntpoint
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mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
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mdconfig -a -t swap -s 512m -u $mdstart || exit 1
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bsdlabel -w md$mdstart auto
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newfs $newfs_flags md${mdstart}$part > /dev/null
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mount /dev/md${mdstart}$part $mntpoint
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su $testuser -c /tmp/forkbomb
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while mount | grep "on $mntpoint " | grep -q /dev/md; do
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umount $mntpoint || sleep 1
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done
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mdconfig -d -u $mdstart
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rm -rf /tmp/forkbomb
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exit 0
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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 <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 <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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volatile u_int *share;
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#define R1 1 /* sync start */
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#define R2 2 /* forks */
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#define R3 3 /* exits */
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#define R4 4 /* fork failed */
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//#define DEBUG
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#define MXFAIL 100
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#define MAXPROC 40000 /* Arbitrary cap */
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#define PARALLEL 200
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void
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test(void)
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{
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int r;
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alarm(1200);
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atomic_add_int(&share[R1], 1);
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while (share[R1] != PARALLEL)
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;
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atomic_add_int(&share[R2], 1);
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for (;;) {
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if (share[R2] >= MAXPROC || share[R4] > MXFAIL)
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break;
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atomic_add_int(&share[R2], 1);
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if ((r = fork()) == -1) {
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atomic_add_int(&share[R4], 1);
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atomic_add_int(&share[R2], -1);
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break;
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}
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}
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atomic_add_int(&share[R3], 1);
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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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struct sigaction sa;
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size_t len;
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int i;
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alarm(1200);
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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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sa.sa_handler = SIG_IGN;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGCHLD, &sa, 0) == -1)
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err(1, "sigaction");
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for (i = 0; i < PARALLEL; i++) {
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if (fork() == 0)
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test();
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}
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while (share[R2] == 0 || share[R3] < share[R2])
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sleep(1);
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#if defined(DEBUG)
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fprintf(stderr, "MAXPROC: %d. forks: %u / exits: %u / fails: %u\n",
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MAXPROC, share[R2], share[R3], share[R4]);
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#endif
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return (0);
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}
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