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4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
118 lines
3.2 KiB
Bash
Executable file
118 lines
3.2 KiB
Bash
Executable file
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2022 Peter Holm <pho@FreeBSD.org>
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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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# Demonstrate that a mapped SHARED file can be updated past LIMIT_FSIZE
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# Kostik wrote:
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# This one should be reproducible when you
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# - have file larger than e.g. RLIMIT_FSIZE
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# - mmaped it without closing the file descriptor
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# - dirty its pages beyond the limit
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# - then unmap
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# - then close the file descriptor.
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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. ../default.cfg
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cat > /tmp/setrlimit2.c <<EOF
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/stat.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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static int signals;
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static void
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handler(int sig __unused)
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{
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signals++;
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}
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int
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main(int argc, char *argv[])
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{
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struct rlimit rlim;
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struct sigaction act;
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struct stat st;
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size_t len;
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int error, fd, ps;
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char *file, *p;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <data file>\n", argv[0]);
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exit(1);
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}
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act.sa_handler = handler;
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act.sa_flags = 0;
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sigemptyset(&act.sa_mask);
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if (sigaction(SIGXFSZ, &act, NULL) != 0)
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err(1, "sigaction");
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file = argv[1];
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ps = getpagesize();
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if ((fd = open(file, O_RDWR)) == -1)
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err(1, "open(%s)", file);
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if ((error = fstat(fd, &st)) == -1)
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err(1, "stat(%s)", file);
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len = round_page(st.st_size);
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if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED)
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err(1, "mmap");
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rlim.rlim_cur = rlim.rlim_max = len / 2;;
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if (setrlimit(RLIMIT_FSIZE, &rlim) == -1)
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err(1, "setrlimit(%ld)", len / 2);
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p[len / 2 + ps] = 'a';
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if (munmap(p, len) == -1)
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err(1, "unmap()");
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close(fd);
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}
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EOF
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here=`pwd`
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cd /tmp
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mycc -o setrlimit2 -Wall -Wextra -O0 -g setrlimit2.c || exit 1
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data=/tmp/setrlimit2.data
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dd if=/dev/zero of=$data bs=1m count=1 status=none
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h1=`md5 < $data`
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./setrlimit2 $data
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h2=`md5 < $data`
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rm -f /tmp/setrlimit2 /tmp/setrlimit2.c
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[ $h1 = $h2 ] && exit 1 || exit 0
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