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/* $OpenBSD: bootstrap.c,v 1.13 2019/06/28 13:32:48 deraadt Exp $ */
/*
* Copyright (c) 2013 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h> /* DEV_BSIZE */
#include <sys/disklabel.h>
#include <sys/dkio.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "installboot.h"
void
bootstrap(int devfd, char *dev, char *bootfile)
{
struct disklabel dl;
struct disklabel *lp;
struct partition *pp;
char *boot, *p, part;
size_t bootsize;
size_t bootsec;
struct stat sb;
int fd, i;
/*
* Install bootstrap code onto the given disk, preserving the
* existing disklabel.
*/
/* Read disklabel from disk. */
if (ioctl(devfd, DIOCGDINFO, &dl) == -1)
err(1, "disklabel");
if (dl.d_secsize == 0) {
warnx("disklabel has sector size of 0, assuming %d", DEV_BSIZE);
dl.d_secsize = DEV_BSIZE;
}
/* Read bootstrap file. */
if (verbose)
fprintf(stderr, "reading bootstrap from %s\n", bootfile);
fd = open(bootfile, O_RDONLY);
if (fd == -1)
err(1, "open %s", bootfile);
if (fstat(fd, &sb) == -1)
err(1, "fstat %s", bootfile);
bootsec = howmany((ssize_t)sb.st_size, dl.d_secsize);
bootsize = bootsec * dl.d_secsize;
if (verbose)
fprintf(stderr, "bootstrap is %zu bytes "
"(%zu sectors @ %u bytes = %zu bytes)\n",
(ssize_t)sb.st_size, bootsec, dl.d_secsize, bootsize);
boot = calloc(1, bootsize);
if (boot == NULL)
err(1, "calloc");
if (read(fd, boot, bootsize) != (ssize_t)sb.st_size)
err(1, "read");
close(fd);
/*
* Check that the bootstrap will fit - partitions must not overlap,
* or if they do, the partition type must be either FS_BOOT or
* FS_UNUSED. The 'c' partition will always overlap and is ignored.
*/
if (verbose)
fprintf(stderr, "ensuring used partitions do not overlap "
"with bootstrap sectors 0-%zu\n", bootsec);
for (i = 0; i < dl.d_npartitions; i++) {
part = 'a' + i;
pp = &dl.d_partitions[i];
if (i == RAW_PART)
continue;
if (DL_GETPSIZE(pp) == 0)
continue;
if ((u_int64_t)bootsec <= DL_GETPOFFSET(pp))
continue;
switch (pp->p_fstype) {
case FS_BOOT:
break;
case FS_UNUSED:
warnx("bootstrap overlaps with unused partition %c",
part);
break;
default:
errx(1, "bootstrap overlaps with partition %c", part);
}
}
/*
* Make sure the bootstrap has left space for the disklabel.
* N.B.: LABELSECTOR *is* a DEV_BSIZE quantity!
*/
lp = (struct disklabel *)(boot + (LABELSECTOR * DEV_BSIZE) +
LABELOFFSET);
for (i = 0, p = (char *)lp; i < (int)sizeof(*lp); i++)
if (p[i] != 0)
errx(1, "bootstrap has data in disklabel area");
/* Patch the disklabel into the bootstrap code. */
memcpy(lp, &dl, sizeof(dl));
/* Write the bootstrap out to the disk. */
if (verbose)
fprintf(stderr, "%s bootstrap to disk\n",
(nowrite ? "would write" : "writing"));
if (nowrite)
return;
if (pwrite(devfd, boot, bootsize, 0) != (ssize_t)bootsize)
err(1, "pwrite");
}
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