Your message dated Thu, 6 Jul 2006 19:30:41 +0200
with message-id <[EMAIL PROTECTED]>
and subject line Fixed in NMU of parted 1.7.1-2.1
has caused the attached Bug report to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what I am
talking about this indicates a serious mail system misconfiguration
somewhere. Please contact me immediately.)
Debian bug tracking system administrator
(administrator, Debian Bugs database)
--- Begin Message ---
Package: parted
Version: 1.6.25.1-1
Severity: grave
I overwrote a USB disk with shred, created an EFI GPT disk label
and two partitions with parted, used the partitions, shredded the
second of them again, made a new file system there, and copied
data to it. The next time I reconnected the disk, I was
surprised by this warning from Linux:
Jan 24 20:13:49 [kernel] SCSI device sda: 312581808 512-byte hdwr sectors
(160042 MB)
- Last output repeated twice -
Jan 24 20:13:50 [kernel] Alternate GPT is invalid, using primary GPT.
Jan 24 20:13:50 [kernel] p1 p2
I then renamed the second partition with parted, in order to make
it rewrite the disk label and partition tables. This got rid of
the warning, but when I looked at the end of /dev/sda2, I saw
that the end of the partition had become overwritten with the
partition table. Because I was using ReiserFS with a 4096-byte
blocksize, the overwritten part was fortunately not part of the
file system. However, if this had been an MD or LVM partition,
important metadata could have been overwritten.
Next, I studied linux-2.6/fs/partitions/efi.h and examined the
on-disk structures with dd | hd | less. In the following
listing, the numbers at the left margin are LBA:byterange in
hexadecimal; all other numbers are in C syntax.
00000001:000-007 __le64 signature = "EFI PART";
00000001:008-00B __le32 revision = 0x00010000;
00000001:00C-00F __le32 header_size = 0x0000005c;
00000001:010-013 __le32 header_crc32 = 0x97529bc4;
00000001:014-017 __le32 reserved1 = 0;
00000001:018-01F __le64 my_lba = 1;
00000001:020-027 __le64 alternate_lba = 0x0000000012a19eaf;
00000001:028-02F __le64 first_usable_lba = 0x0000000000000022;
00000001:030-037 __le64 last_usable_lba = 0x0000000012a19e8e;
00000001:038-047 efi_guid_t disk_guid;
00000001:048-04F __le64 partition_entry_lba = 2;
00000001:050-053 __le32 num_partition_entries = 0x00000080;
00000001:054-057 __le32 sizeof_partition_entry = 0x00000080;
00000001:058-05B __le32 partition_entry_array_crc32 = 0x85c3221e;
00000002:000-00F efi_guid_t partition_type_guid = PARTITION_BASIC_DATA_GUID;
00000002:010-01F efi_guid_t unique_partition_guid;
00000002:020-027 __le64 starting_lba = 0x0000000000000022;
00000002:028-02F __le64 ending_lba = 0x000000000003d090;
00000002:030-037 gpt_entry_attributes attributes = 0;
00000002:038-07F efi_char16_t[36] partition_name = L"USB~2 clear";
00000002:080-08F efi_guid_t partition_type_guid = PARTITION_BASIC_DATA_GUID;
00000002:090-09F efi_guid_t unique_partition_guid;
00000002:0A0-0A7 __le64 starting_lba = 0x000000000003d091;
00000002:0A8-0AF __le64 ending_lba = 0x0000000012a19e8e;
00000002:0B0-0B7 gpt_entry_attributes attributes = 0;
00000002:0B8-0FF efi_char16_t[] partition_name = L"USB~2 cipher";
12a19e8e:000-00F efi_guid_t partition_type_guid = PARTITION_BASIC_DATA_GUID;
12a19e8e:010-01F efi_guid_t unique_partition_guid;
12a19e8e:020-027 __le64 starting_lba = 0x0000000000000022;
12a19e8e:028-02F __le64 ending_lba = 0x000000000003d090;
12a19e8e:030-037 gpt_entry_attributes attributes = 0;
12a19e8e:038-07F efi_char16_t[36] partition_name = L"USB~2 clear";
12a19e8e:080-08F efi_guid_t partition_type_guid = PARTITION_BASIC_DATA_GUID;
12a19e8e:090-09F efi_guid_t unique_partition_guid;
12a19e8e:0A0-0A7 __le64 starting_lba = 0x000000000003d091;
12a19e8e:0A8-0AF __le64 ending_lba = 0x0000000012a19e8e;
12a19e8e:0B0-0B7 gpt_entry_attributes attributes = 0;
12a19e8e:0B8-0FF efi_char16_t[36] partition_name = L"USB~2 cipher";
12a19e8e:100-1FF = 0;
12a19e8f:000-12a19ead:1FF = 0;
12a19eae:000-1FF = garbage;
12a19eaf:000 __le64 signature = "EFI PART";
12a19eaf:008 __le32 revision = 0x00010000;
12a19eaf:00C __le32 header_size = 0x0000005c;
12a19eaf:010 __le32 header_crc32 = 0x6de2756c;
12a19eaf:014 __le32 reserved1 = 0;
12a19eaf:018 __le64 my_lba = 0x0000000012a19eaf;
12a19eaf:020 __le64 alternate_lba = 1;
12a19eaf:028 __le64 first_usable_lba = 0x0000000000000022;
12a19eaf:030 __le64 last_usable_lba = 0x0000000012a19e8e;
12a19eaf:038 efi_guid_t disk_guid;
12a19eaf:048 __le64 partition_entry_lba = 0x0000000012a19e8e;
12a19eaf:050 __le32 num_partition_entries = 0x00000080;
12a19eaf:054 __le32 sizeof_partition_entry = 0x00000080;
12a19eaf:058 __le32 partition_entry_array_crc32 = 0x85c3221e;
Note that:
* last_usable_lba = 0x12a19e8e in both the primary and alternate
gpt_header structures.
* ending_lba = 0x12a19e8e for the second partition in both the
primary and alternate partition table.
* partition_entry_lba = 0x12a19e8e in the alternate gpt_header
structure.
* LBA 0x12a19e8e actually contains the beginning of the alternate
partition table. The table is 0x80*0x80 = 0x4000 bytes long,
so it needs 0x20 blocks (each 0x200 bytes).
* LBA 0x12a19eae between the alternative partition table and the
alternative gpt_header is random garbage, presumably from the
whole-disk shred run.
I think this means parted should have placed the alternative
partition table at the LBA range 0x12a19e8f-0x12a19eae, rather
than 0x12a19e8e-0x12a19ead.
I have now shrunk the partition by one block, so it'll be safe
regardless of which file system I may use in the future. The
last_usable_lba fields are still dangerously wrong, though.
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-1-k7
Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8)
Versions of packages parted depends on:
ii libc6 2.3.5-6 GNU C Library: Shared libraries an
ii libncurses5 5.4-3 Shared libraries for terminal hand
ii libparted1.6-13 1.6.25.1-1 The GNU Parted disk partitioning s
ii libreadline5 5.0-10 GNU readline and history libraries
parted recommends no packages.
-- no debconf information
pgpS4STWWOzLH.pgp
Description: PGP signature
--- End Message ---
--- Begin Message ---
Version: 1.7.1-2.1
I've NMUed for this bug (fixing the bug to use versioning instead of the
"fixed" tag, to ease tracking through testing); here's the changelog:
> parted (1.7.1-2.1) unstable; urgency=low
> .
> * Non-maintainer upload.
> * gpt.dpatch: Put the alternative GPT partition table one sector further
> out, to avoid having it overlap with the last sector of one partition.
> (Closes: #349718)
/* Steinar */
--
Homepage: http://www.sesse.net/
--- End Message ---
