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Change the way how we update bootcode for BSD scheme.

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Since the only parameter that we check is size of bootcode, then
allow only two sizes: size of boot1 and size of /boot/boot.
This partially protects users from losing ability to boot if incorrect
bootcode is specified.

Requested by:	ru
This commit is contained in:
Andrey V. Elsukov 2011-06-20 12:22:30 +00:00
parent a834836d83
commit 503e6682cd
1 changed files with 12 additions and 13 deletions
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25
sys/geom/part/g_part_bsd.c
View file

@ -46,6 +46,11 @@ __FBSDID("$FreeBSD$");
#include "g_part_if.h"
#define BOOT1_SIZE 512
#define LABEL_SIZE 512
#define BOOT2_OFF (BOOT1_SIZE + LABEL_SIZE)
#define BOOT2_SIZE (BBSIZE - BOOT2_OFF)
FEATURE(geom_part_bsd, "GEOM partitioning class for BSD disklabels");
struct g_part_bsd_table {
@ -170,22 +175,16 @@ g_part_bsd_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
{
struct g_part_bsd_table *table;
const u_char *codeptr;
size_t hdsz, tlsz;
size_t codesz, tlofs;
hdsz = 512;
tlofs = hdsz + 148 + basetable->gpt_entries * 16;
tlsz = BBSIZE - tlofs;
if (gpp->gpp_codesize != BOOT1_SIZE && gpp->gpp_codesize != BBSIZE)
return (ENODEV);
table = (struct g_part_bsd_table *)basetable;
bzero(table->bbarea, hdsz);
bzero(table->bbarea + tlofs, tlsz);
codeptr = gpp->gpp_codeptr;
codesz = MIN(hdsz, gpp->gpp_codesize);
if (codesz > 0)
bcopy(codeptr, table->bbarea, codesz);
codesz = MIN(tlsz, gpp->gpp_codesize - tlofs);
if (codesz > 0)
bcopy(codeptr + tlofs, table->bbarea + tlofs, codesz);
bcopy(codeptr, table->bbarea, BOOT1_SIZE);
if (gpp->gpp_codesize == BBSIZE)
bcopy(codeptr + BOOT2_OFF, table->bbarea + BOOT2_OFF,
BOOT2_SIZE);
return (0);
}