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75 lines
2.3 KiB
Bash
Executable file
75 lines
2.3 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 Mark Johnston <markj@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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# "panic: pmap_demote_pde: page table page for a wired mapping
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# is missing" seen.
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# Fixed by r345382
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. ../default.cfg
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cd /tmp
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cat > mprotect.c <<EOF
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#include <sys/mman.h>
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#include <err.h>
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#include <stdlib.h>
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int
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main(void)
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{
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char *addr, c;
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size_t i, len;
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len = 2 * 1024 * 1024;
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addr = mmap(NULL, 2 * 1024 * 1024, PROT_READ,
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MAP_ANON | MAP_ALIGNED_SUPER, -1, 0);
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if (addr == MAP_FAILED)
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err(1, "mmap");
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if (mlock(addr, len) != 0) /* hopefully this gets a superpage */
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err(1, "mlock");
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if (mprotect(addr, len, PROT_NONE) != 0)
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err(1, "mprotect");
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if (mprotect(addr, len, PROT_READ) != 0)
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err(1, "mprotect");
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for (i = 0; i < len; i++) /* preemptive superpage mapping */
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c = *(volatile char *)(addr + i);
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if (mprotect(addr, 4096, PROT_NONE) != 0) /* trigger demotion */
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err(1, "mprotect");
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if (munlock(addr, len) != 0)
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err(1, "munlock");
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return (0);
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}
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EOF
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mycc -o mprotect -Wall -Wextra -O2 mprotect.c || exit 1
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./mprotect; s=$?
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rm mprotect.c mprotect
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exit $s
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