Date: Sat, 7 Nov 2009 17:29:03 +0000 (UTC) From: Robert Noland <rnoland@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/geom/part g_part_gpt.c Message-ID: <200911071729.nA7HTLpG040115@repoman.freebsd.org>
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rnoland 2009-11-07 17:29:03 UTC
FreeBSD src repository
Modified files:
sys/geom/part g_part_gpt.c
Log:
SVN rev 199017 on 2009-11-07 17:29:03Z by rnoland
Fix handling of GPT headers when size is > 92 bytes.
It is valid for an on-disk GPT header to report a header size which is
greater than 92 bytes. Previously, we would read in the sector and copy
only the 92 bytes that we know how to deal with before calculating the
checksum for comparison. This meant that when we did the checksum, we
overshot the buffer and took in random memory, so the checksum would fail.
We now determine the size of the header and allocate enough space to
preserve the entire on-disk contents. This allows us to be correctly
calculate the checksum and be able to modify and write the header back
to the disk, while preserving data that we might not understand.
Reported by: Kris Weston
Approved by: marcel@
MFC after: 2 weeks
Revision Changes Path
1.19 +92 -67 src/sys/geom/part/g_part_gpt.c
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