>Number: 175086
>Category: bin
>Synopsis: 9.1 does not boot from GPT partition that can have more that
>128 partition entries (worked under 7.4-STABLE, bug in sys/boot/common/gpt.c)
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jan 07 07:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Andre Albsmeier
>Release: FreeBSD 9.1-PRERELEASE i386
>Organization:
>Environment:
System: FreeBSD 9.1-PRERELEASE
>Description:
Booting from a GPT partitioned disk that can have more
than 128 parition entries (e.g. 248 in this case)
fails under 9.1 but worked under 7.4.
This is due to a test that was introduced in sys/boot/common/gpt.c:
...
#define MAXTBLENTS 128
...
if (bcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0 ||
hdr->hdr_lba_self != hdrlba || hdr->hdr_revision < 0x00010000 ||
hdr->hdr_entsz < sizeof(struct gpt_ent) ||
hdr->hdr_entries > MAXTBLENTS || DEV_BSIZE % hdr->hdr_entsz != 0) {
printf("%s: invalid %s GPT header\n", BOOTPROG, which);
return (-1);
}
>How-To-Repeat:
Create a disk using
gpart create -s gpt -n 248 $disk
and add bootcode and system to it. Add some delay into gptinit()
of sys/boot/i386/gptboot/gptboot.c so you can read the error
messages before reset occurs:
invalid primary GPT header
invalid backup GPT header
unable to load GPT
>Fix:
The check should be removed since a GPT header with more than
128 possible parition entries is not invalid and can legally
be created with gpart.
>Release-Note:
>Audit-Trail:
>Unformatted:
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