Author: marcel
Date: Mon Sep 28 23:52:47 2009
New Revision: 197608
URL: http://svn.freebsd.org/changeset/base/197608
Log:
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 <ml...@digiart.art.br>
MFC after: 1 week
Modified:
head/sys/geom/part/g_part_ebr.c
Modified: head/sys/geom/part/g_part_ebr.c
==============================================================================
--- head/sys/geom/part/g_part_ebr.c Mon Sep 28 23:48:16 2009
(r197607)
+++ head/sys/geom/part/g_part_ebr.c Mon Sep 28 23:52:47 2009
(r197608)
@@ -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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