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and subject line Closing #339891 again
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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: Tue, 22 Nov 2005 03:05:40 +0100
From: "Steinar H. Gunderson" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Closing #339891 again
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Version: 2.5.3-1
2.5.3-1 really fixes this; the BTS claims it will archive my bug even though
it isn't fixed in stable, but according to vorlon, the BTS is lying to me and
should be ignored. :-)
The evms upload to stable will happen as soon as evms 2.5.3-7 (or something
newer) enters testing, which incidentially can't happen as long as the BTS
thinks this bug affects unstable. Thus, closing it again, hoping that
mips(el) will soon be in good shape again (see #339981) and we can soon fix
this.
/* Steinar */
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