Bug 472136

Summary:	RFE: handle compressed kernel object files for systemtap-style offline searches
Product:	[Fedora] Fedora	Reporter:	Frank Ch. Eigler <fche>
Component:	elfutils	Assignee:	Roland McGrath <roland>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	jan.kratochvil, roland
Target Milestone:	---
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2009-07-23 19:38:56 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Frank Ch. Eigler 2008-11-18 22:18:30 UTC

module-init-tools is compiled with --enable-zlib, even on fedora, so it's
possible for a sysadmin to compress all the /lib/modules/..../FOO.ko files
and still have modprobe etc. work.  But elfutils won't find .ko.gz files
during its search of offline modules, so systemtap wouldn't be able to probe
them.

Please consider extending libdwfl/linux-kernel-modules.c to look for .ko.gz
files too.

Comment 1 Roland McGrath 2008-12-07 03:09:31 UTC

This would entail too pieces of work.  The easy one is making the .ko search look for .ko.gz too.  The more complex one is teaching libdwfl to use libz to decompress into memory when using elf_begin.  That is doable, and easier with consolidation of file-opening that the .sharing branch has.  Seems like we could have it, but not a top priority real soon.

Comment 2 Roland McGrath 2009-01-06 09:48:56 UTC

Implemented upstream, should be in 0.139

Comment 3 Fedora Update System 2009-01-27 01:52:07 UTC

elfutils-0.139-1.fc10 has been pushed to the Fedora 10 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update elfutils'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F10/FEDORA-2009-1005

Comment 4 Roland McGrath 2009-07-23 19:38:56 UTC

These bugs are fixed in current Fedora 10/11 updates of elfutils.