Bug 703104

Summary:	[PATCH] Use-after-free() when eval in variable assignments reassigns the same variable
Product:	[Fedora] Fedora	Reporter:	Lubomir Rintel <lkundrak>
Component:	make	Assignee:	Petr Machata <pmachata>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	mnewsome, pmachata
Target Milestone:	---
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Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	699911	Environment:
Last Closed:	2011-06-22 12:30:49 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	699911
Bug Blocks:

Description Lubomir Rintel 2011-05-09 09:56:21 UTC

+++ This bug was initially created as a clone of Bug #699911 +++

Created attachment 495050 [details]
Proposed fix

In real world, such memory corruption occurs when using eval constructs for lazy assignment:

VARIABLE = $(eval VARIABLE := $(shell long-slow-command)$(VARIABLE)

Upstream submission: https://savannah.gnu.org/patch/index.php?7534

Comment 1 Petr Machata 2011-06-22 12:30:49 UTC

Thanks for adding the patch.