123 lines
3.0 KiB
Bash
Executable File
123 lines
3.0 KiB
Bash
Executable File
#!/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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# Test scenario for "D20947: Check and avoid overflow when incrementing
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# fp->f_count in fget_unlocked() and fhold()".
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# OOM killing seen. Cap files and procs for now.
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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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rm -f /tmp/dup /tmp/dup.c || exit 1
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sed '1,/^EOF/d' < $odir/$0 > $dir/dup.c
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mycc -o dup -Wall -Wextra dup.c || exit 1
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rm -f dup.c
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cd $odir
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/tmp/dup; s=$?
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rm -f /tmp/dup
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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/stat.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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static volatile u_int *share;
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#define N 10240
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#define CAP_FILES 50000
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#define CAP_PROCS 1000
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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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struct stat st;
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pid_t pid[N];
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size_t len;
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int fd, fd2, i, j, last;
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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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if ((fd = open("/dev/zero", O_RDONLY)) == -1)
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err(1, "open(/dev/zero)");
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i = 0;
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for (;;) {
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if ((fd2 = dup(fd)) == -1) {
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if (errno == EMFILE)
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break;
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err(1, "dup()");
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}
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last = fd2;
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if (++i == CAP_FILES)
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break;
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}
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#if defined(DEBUG)
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fprintf(stderr, "i = %d\n", i);
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#endif
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for (i = 0; i < N; i++) {
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if ((pid[i] = fork()) == 0) {
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if (fstat(last, &st) == -1)
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err(1, "stat(%s)", "/dev/zero");
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while(share[SYNC] == 0)
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usleep(100000);
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_exit(0);
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}
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if (pid[i] == -1) {
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warn("fork()");
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i--;
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break;
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}
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if (i + 1 == CAP_PROCS)
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break;
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}
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share[SYNC] = 1;
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for (j = 0; j < i; j++) {
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if (waitpid(pid[j], NULL, 0) != pid[j])
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err(1, "waitpid(%d), index %d", pid[j], j);
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}
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return (0);
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}
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