Date: Mon, 7 Jun 2010 20:31:55 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r208899 - stable/8/sys/geom/part Message-ID: <201006072031.o57KVtD7084530@svn.freebsd.org>
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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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