Bug 1097272

Summary:	Ruby bindings should use RB_GC_GUARD (instead of volatile) for enhanced safety
Product:	[Community] Virtualization Tools	Reporter:	Richard W.M. Jones <rjones>
Component:	libguestfs	Assignee:	Richard W.M. Jones <rjones>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	ptoscano
Target Milestone:	---	Keywords:	Reopened
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
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Last Closed:	2025-10-17 00:10:10 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Richard W.M. Jones 2014-05-13 13:06:23 UTC

Description of problem:

libguestfs Ruby bindings currently use volatile to ensure
the compiler spills pointers to live data onto the stack.
Which is probably fine for GCC, maybe not for other compilers.
In any case it could be better to use the RB_GC_GUARD macro
for this purpose.

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

libguestfs, all recent versions

Additional info:

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/60741
https://github.com/libguestfs/libguestfs/blob/6cc521dc4533d10659214cc660f31239de9e28e7/generator/ruby.ml#L62

Thanks: Vít Ondruch

Comment 1 Richard W.M. Jones 2014-05-13 13:08:15 UTC

(BTW before using this macro, we should probably look at what
it actually does to ensure it is sane.)

Comment 2 Red Hat Bugzilla 2025-10-17 00:10:10 UTC

This product has been discontinued or is no longer tracked in Red Hat Bugzilla.

Comment 3 Alasdair Kergon 2025-10-17 12:52:13 UTC

Reopening because Virtualization Tools has not been discontinued.