78 lines
2.3 KiB
Bash
Executable File
78 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2017 Dell EMC Isilon
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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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# r320344: allow mprotect(2) over the guards to succeed regardless of
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# the requested protection.
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. ../default.cfg
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grep -q MAP_GUARD /usr/include/sys/mman.h 2>/dev/null || exit 0
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here=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $here/$0 > mmap30.c
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mycc -o mmap30 -Wall -Wextra -O2 -g mmap30.c || exit 1
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rm -f mmap30.c /tmp/mmap30.core
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/tmp/mmap30 > /dev/null
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s=$?
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rm -f /tmp/mmap30 /tmp/mmap30.core
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exit $s
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EOF
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#include <sys/types.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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int
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main(void)
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{
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int pagesz;
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void *addr;
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pagesz = getpagesize();
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addr = mmap(NULL, pagesz, PROT_NONE, MAP_GUARD, -1, 0);
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if (addr == (char *)MAP_FAILED)
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err(1, "FAIL: mmap(MAP_GUARD)");
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if (mprotect(addr, pagesz, PROT_READ | PROT_WRITE) == -1)
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err(1, "mprotect(RW)");
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if (mprotect(addr, pagesz, PROT_NONE) == -1)
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err(1, "mprotect(RW)");
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if (munmap(addr, pagesz) == -1)
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err(1, "munmap");
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return (0);
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}
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