1af40d9ce4
Old kvm_mkdb had a possibility to check old kernel's version string retained at a hole between text segment and data segment. It might happen a misunderstanding that the running kernel's version matches kvm.db's version. This had been caused by checking current kernel's version string via /dev/kmem. The version string can get via sysctl, so use it!
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/* $NetBSD: testdb.c,v 1.8 2001/03/19 15:18:59 msaitoh Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)testdb.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: testdb.c,v 1.8 2001/03/19 15:18:59 msaitoh Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <kvm.h>
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#include <db.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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#include <string.h>
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#include <paths.h>
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#include "extern.h"
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/* Return true if the db file is valid, else false */
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int
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testdb()
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{
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DB *db;
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int kd, ret, dbversionlen;
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DBT rec;
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char dbversion[_POSIX2_LINE_MAX];
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char *kversion;
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int mib[2];
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size_t size;
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ret = 0;
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db = NULL;
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if ((kd = open(_PATH_KMEM, O_RDONLY, 0)) < 0)
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goto close;
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if ((db = dbopen(_PATH_KVMDB, O_RDONLY, 0, DB_HASH, NULL)) == NULL)
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goto close;
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/* Read the version out of the database */
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rec.data = VRS_KEY;
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rec.size = sizeof(VRS_KEY) - 1;
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if ((db->get)(db, &rec, &rec, 0))
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goto close;
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if (rec.data == 0 || rec.size == 0 || rec.size > sizeof(dbversion))
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goto close;
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memmove(dbversion, rec.data, rec.size);
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dbversionlen = rec.size;
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/* Read version string from kernel memory */
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mib[0] = CTL_KERN;
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mib[1] = KERN_VERSION;
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if (sysctl(mib, 2, NULL, &size, NULL, 0) == -1)
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errx(1, "can't get size of kernel version string");
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if ((kversion = malloc(size)) == NULL)
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err(1, "couldn't allocate space for buffer data");
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if (sysctl(mib, 2, kversion, &size, NULL, 0) == -1)
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errx(1, "can't get kernel version string");
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/* If they match, we win */
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ret = memcmp(dbversion, kversion, dbversionlen) == 0;
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close: if (kd >= 0)
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(void)close(kd);
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if (db)
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(void)(db->close)(db);
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return (ret);
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}
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