98 lines
2.6 KiB
Bash
Executable File
98 lines
2.6 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) 2021 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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# Test scenario suggestion by alc@
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. ../default.cfg
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cd /tmp
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cat > mprotect2.c <<EOF
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/*
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For example, write a program that mmap(MAP_ANON)'s a gigabyte of
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PROT_WRITE virtual address space, iterates over that space removing
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PROT_WRITE on every other page, and then measure the time to perform a
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single mprotect() restoring PROT_WRITE to the entire gigabyte of virtual
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address space.
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*/
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#include <sys/param.h>
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#include <sys/mman.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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define SIZ 0x40000000LL /* 1GB */
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static void
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test(void)
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{
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size_t i, len;
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char *cp;
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len = SIZ;
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if ((cp = mmap(NULL, len, PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0))
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== MAP_FAILED)
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err(1, "mmap");
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for (i = 0; i < SIZ; i += PAGE_SIZE * 2) {
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if (mprotect(cp + i, PAGE_SIZE, 0) != 0)
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err(1, "mprotect(). %d", __LINE__);
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}
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if (mprotect(cp, SIZ, PROT_WRITE) != 0)
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err(1, "mprotect(). %d", __LINE__);
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if (munmap(cp, SIZ) == -1)
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err(1, "munmap()");
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}
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int
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main(void)
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{
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int i;
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/* Slow run with debug.vmmap_check=1 */
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alarm(120);
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for (i = 0; i < 64; i++)
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test();
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return (0);
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}
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EOF
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mycc -o mprotect2 -Wall -Wextra -O2 mprotect2.c || exit 1
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./mprotect2; s=$?
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rm mprotect2.c mprotect2
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exit $s
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