Bug 859834 - poor dump file recognition
Summary: poor dump file recognition
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: file
Version: 6.3
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Jan Kaluža
QA Contact: BaseOS QE Security Team
Depends On:
Blocks: 860139
TreeView+ depends on / blocked
Reported: 2012-09-24 07:28 UTC by Karel Srot
Modified: 2012-10-04 12:21 UTC (History)
0 users

Fixed In Version: file-5.04-15.el6
Doc Type: Bug Fix
Doc Text:
Cause: File contained more magic patterns to detect output of "dump" backup tool. Consequence: On big-endian architectures, less detailed magic pattern was used and the File output was inconsistent. Fix: Less detailed magic pattern has been removed and only one magic pattern to detect "dump" output is used now. Result: File uses more detailed magic pattern every time even on big-endian architectures.
Clone Of:
: 860139 862744 (view as bug list)
Last Closed: 2012-10-04 12:21:39 UTC
Target Upstream Version:

Attachments (Terms of Use)
proposed patch (494 bytes, patch)
2012-09-24 09:05 UTC, Jan Kaluža
no flags Details | Diff
dump from a big endian system (2.00 KB, application/octet-stream)
2012-09-24 10:14 UTC, Karel Srot
no flags Details

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2012:1339 0 normal SHIPPED_LIVE file bug fix update 2012-10-04 16:15:20 UTC

Description Karel Srot 2012-09-24 07:28:57 UTC
Description of problem:

On RHEL6 there are differences between platforms how the dump file is recognized.

on x86_64, i386 e.g.
backup: new-fs dump file (little endian), This dump Sat Sep 22 21:00:54 2012, Previous dump Wed Dec 31 19:00:00 1969, Volume 1, Level zero, type: tape header, Label myext3fs, Filesystem /mnt/myext3fs, Device /dev/loop0, Host any.host.org, Flags 3

on s390x:
backup: dump format, 4.2 or 4.3 BSD without IDC

Version-Release number of selected component (if applicable):

How reproducible:
execute file against the dump file created by dump command

Comment 2 Jan Kaluža 2012-09-24 09:04:39 UTC
Upstream bug report: http://bugs.gw.com/view.php?id=204

Comment 3 Jan Kaluža 2012-09-24 09:05:34 UTC
Created attachment 616434 [details]
proposed patch

This patch removes duplicated magic pattern and keeps the one which provides more detailed information about dumps.

Comment 4 Jan Kaluža 2012-09-24 09:10:38 UTC
Can you please attach backup file (or first 4096 bytes) for which it's broken (big endian version) so upstream can verify the fix?

Comment 5 Karel Srot 2012-09-24 10:14:45 UTC
Created attachment 616457 [details]
dump from a big endian system

attached big endian dump sample

Comment 11 errata-xmlrpc 2012-10-04 12:21:39 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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