HardenedBSD/usr.sbin/kvm_mkdb/nlist.c
Alexander Langer 8abdc2eb40 Sweep through the tree fixing mmap() usage:
- Use MAP_FAILED instead of the constant -1 to indicate
    failure (required by POSIX).
  - Removed flag arguments of '0' (required by POSIX).
  - Fixed code which expected an error return of 0.
  - Fixed code which thought any address with the high bit set
    was an error.
  - Check for failure where no checks were present.

Discussed with:	bde
1997-01-16 21:58:40 +00:00

167 lines
4.7 KiB
C

/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)nlist.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <a.out.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
typedef struct nlist NLIST;
#define _strx n_un.n_strx
#define _name n_un.n_name
#define badfmt(str) errx(1, "%s: %s: %s", kfile, str, strerror(EFTYPE))
static char *kfile;
void
create_knlist(name, db)
char *name;
DB *db;
{
register int nsyms;
struct exec *ebuf;
NLIST *nbuf;
DBT data, key;
int fd;
char *strtab;
u_char *filep;
char *vp;
struct stat sst;
long cur_off, voff;
kfile = name;
if ((fd = open(name, O_RDONLY, 0)) < 0)
err(1, "%s", name);
fstat(fd,&sst);
filep = (u_char*)mmap(0, sst.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (filep == (u_char*)MAP_FAILED)
err(1, "mmap failed");
/* Read in exec structure. */
ebuf = (struct exec *) filep;
/* Check magic number and symbol count. */
if (N_BADMAG(*ebuf))
badfmt("bad magic number");
if (!ebuf->a_syms)
badfmt("stripped");
strtab = filep + N_STROFF(*ebuf) + sizeof (int);
/* Seek to symbol table. */
cur_off = N_SYMOFF(*ebuf);
/* Read each symbol and enter it into the database. */
nsyms = ebuf->a_syms / sizeof(struct nlist);
while (nsyms--) {
nbuf = (NLIST *)(filep + cur_off);
cur_off += sizeof(NLIST);
if (!nbuf->_strx || nbuf->n_type&N_STAB)
continue;
key.data = (u_char *)strtab + nbuf->_strx - sizeof(long);
key.size = strlen((char *)key.data);
data.data = (u_char *)nbuf;
data.size = sizeof(NLIST);
if (db->put(db, &key, &data, 0))
err(1, "record enter");
if (1 && strcmp((char *)key.data, VRS_SYM) == 0) {
#ifndef KERNTEXTOFF
/*
* XXX
* The FreeBSD bootloader loads the kernel at the a_entry address, meaning
* that this is where the kernel starts. (not at KERNBASE)
*
* This may be introducing an i386 dependency.
*/
#if defined(__FreeBSD__)
#define KERNTEXTOFF ebuf->a_entry
#else
#define KERNTEXTOFF KERNBASE
#endif
#endif
/*
* Calculate offset relative to a normal (non-kernel)
* a.out. KERNTEXTOFF is where the kernel is really
* loaded; N_TXTADDR is where a normal file is loaded.
* From there, locate file offset in text or data.
*/
voff = nbuf->n_value - KERNTEXTOFF + N_TXTADDR(*ebuf);
if ((nbuf->n_type & N_TYPE) == N_TEXT)
voff += N_TXTOFF(*ebuf) - N_TXTADDR(*ebuf);
else
voff += N_DATOFF(*ebuf) - N_DATADDR(*ebuf);
vp = filep + voff;
key.data = (u_char *)VRS_KEY;
key.size = sizeof(VRS_KEY) - 1;
data.data = vp;
data.size = strchr(vp, '\n') - vp + 1;
if (db->put(db, &key, &data, 0))
err(1, "record enter");
/* Restore to original values. */
data.size = sizeof(NLIST);
}
}
}