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From: "Steinar H. Gunderson" <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: evms: corrupts RAID-5 volumes when running in degraded mode
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Date: Sat, 19 Nov 2005 15:43:11 +0100
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Package: evms
Version: 2.5.2-1
Severity: critical
Justification: causes serious data loss
This is mainly a placeholder bug for my upcoming EVMS upload to stable;
it has already been addressed in unstable (and will eventually progress
to testing). (A -done message informing the BTS about the fact that 2.5.3
fixes it will be sent shortly.)
EVMS prior to 2.5.3 has a buffer overflow when dealing with degraded
RAID-5 volumes; in short, the wrong memory gets overwritten and EVMS
segfaults. This can render the entire system unbootable (since the root
volume might be on RAID-5, and evms_activate crashes upon loading the md
plugin), but I've also seen it eat the RAID-5 superblock.
There is also a bug where the engine might segfault when doing a RAID-5
expand, but AFAIK, all this does is to segfault evms; I haven't seen it
cause data loss. Also, RAID-5 expand is sort of an infrequent use case
anyhow...
The solution is to simply backport the RAID-5 fixes from 2.5.3 into
2.5.2. The two entries from the changelog are:
- Fix stack corruption bug in MD plugin. [Marcus Meissner]
- Fix memory corruption bug for RAID-5 regions running in degraded
mode. [Gleb Stiblo]
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.14
Locale: LANG=en_DK.UTF-8, LC_CTYPE=en_DK.UTF-8 (charmap=UTF-8)
Versions of packages evms depends on:
ii libc6 2.3.5-7 GNU C Library: Shared libraries an
ii libevms-2.5 2.5.3-6 Enterprise Volume Management Syste
Versions of packages evms recommends:
pn evms-cli <none> (no description available)
ii evms-gui 2.5.3-6 Enterprise Volume Management Syste
-- debconf-show failed
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Date: Mon, 5 Dec 2005 14:04:58 +0100
From: "Steinar H. Gunderson" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: Processed: Fixed in NMU of evms 2.5.2-1.testing1
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Version: 2.5.2-1.testing1
On Mon, Dec 05, 2005 at 05:03:14AM -0800, Debian Bug Tracking System wrote:
>> tag 339891 + fixed
> Bug#339891: evms: corrupts RAID-5 volumes when running in degraded mode
> There were no tags set.
> Tags added: fixed
That upload was of course no NMU, just switched maintainerships after the
sarge release. Closing it properly for testing now.
/* Steinar */
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