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Bug 1531168

Summary:	glibc: setcontext/makecontext alignment issues on x86
Product:	Red Hat Enterprise Linux 7	Reporter:	Florian Weimer <fweimer>
Component:	glibc	Assignee:	Florian Weimer <fweimer>
Status:	CLOSED ERRATA	QA Contact:	Sergey Kolosov <skolosov>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.6	CC:	ashankar, codonell, fweimer, mnewsome, pfrankli, skolosov
Target Milestone:	rc	Keywords:	Patch
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	glibc-2.17-241.el7	Doc Type:	Bug Fix
Doc Text:	Cause: The glibc functions startcontext and makecontext did not properly maintain stack alignment on the x86 platforms (32-bit and 64-bit). Consequence: Recent GCC versions, including those which are available through Developer Toolset (DTS), generate code that assumes ABI-mandated stack alignment in more places, and applications which use these functions could crash as a result. Fix: The glibc implementation of startcontext and makecontext was adjusted to follow ABI stack alignment. Result: Applications compiled with recent GCC versions no longer crash due to a misaligned stack.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-10-30 09:36:35 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:
Bug Depends On:
Bug Blocks:	1565233

Description Florian Weimer 2018-01-04 17:43:23 UTC

The makecontext family of functions has alignment issues on i386 and x86-64:

https://sourceware.org/bugzilla/show_bug.cgi?id=18661
  (the change to sysdeps/unix/sysv/linux/x86_64/__start_context.S)
https://sourceware.org/bugzilla/show_bug.cgi?id=22667

We should consider fixing this for the benefit of DTS-compiled code.

Comment 6 errata-xmlrpc 2018-10-30 09:36:35 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:3092