Date: Mon, 28 Sep 2009 23:52:47 +0000 (UTC) From: Marcel Moolenaar <marcel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r197608 - head/sys/geom/part Message-ID: <200909282352.n8SNql1n069970@svn.freebsd.org>
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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 <mlobo@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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