Author: ae
Date: Mon Jun 7 20:31:55 2010
New Revision: 208899
URL: http://svn.freebsd.org/changeset/base/208899
Log:
MFC r197608:
The first 96 bytes may not be zeroes. It can contain trivial boot
code that merely emits an error and waits for a key press before
rebooting. The error being that extended partitions are not
bootable. The origin is presumed to be Windows 2000; Windows XP
does not do this...
For now, ignore the first 96 bytes when checking that the EBR is
(for the most part) all zeroes.
Tested by: Mario Lobo <mlobo at digiart.art.br>
Dieter <dieterbsd at engineer.com>
PR: kern/141235
Reviewed by: marcel
Approved by: kib (mentor)
Approved by: re (bz)
Modified:
stable/8/sys/geom/part/g_part_ebr.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
stable/8/sys/dev/xen/xenpci/ (props changed)
stable/8/sys/geom/sched/ (props changed)
Modified: stable/8/sys/geom/part/g_part_ebr.c
==============================================================================
--- stable/8/sys/geom/part/g_part_ebr.c Mon Jun 7 18:47:53 2010
(r208898)
+++ stable/8/sys/geom/part/g_part_ebr.c Mon Jun 7 20:31:55 2010
(r208899)
@@ -410,13 +410,13 @@ g_part_ebr_probe(struct g_part_table *ta
goto out;
/*
- * The sector is all zeroes, except for the partition entries
- * and some signatures or disk serial number. Those can be
- * found in the 9 bytes immediately in front of the partition
- * table.
+ * The sector is all zeroes, except for the partition entries,
+ * pseudo boot code and some signatures or disk serial number.
+ * The latter can be found in the 9 bytes immediately in front
+ * of the partition table.
*/
sum = 0;
- for (index = 0; index < DOSPARTOFF - 9; index++)
+ for (index = 96; index < DOSPARTOFF - 9; index++)
sum += buf[index];
if (sum != 0)
goto out;
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