Bug 1775819

Summary:	glibc: Disable libio vtable validation for interposed pre-2.1 stdio handles [rhel-8]
Product:	Red Hat Enterprise Linux 8	Reporter:	Florian Weimer <fweimer>
Component:	glibc	Assignee:	Patsy Griffin <pfrankli>
Status:	CLOSED ERRATA	QA Contact:	qe-baseos-tools-bugs
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	8.2	CC:	ashankar, codonell, dj, fweimer, mnewsome, pfrankli, sipoyare, skolosov
Target Milestone:	rc	Keywords:	Patch, Triaged
Target Release:	8.2
Hardware:	i686
OS:	Unspecified
Whiteboard:
Fixed In Version:	glibc-2.28-106.el8	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 01:32:42 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:	1819440, 1825061

Description Florian Weimer 2019-11-22 21:22:43 UTC

Current glibc does not preserve binary compatibilty with certain C++ binaries linked against versions before glibc 2.1. The legacy stdio implementation in libio/oldstdfiles.c needs a check for interposition of the stdio handles, similar to the existing check in libio/stdfiles.c (which was fixed prior to the release of Red Hat Enterprise Linux 8.0).

Comment 1 Carlos O'Donell 2019-12-09 14:14:02 UTC

commit cb61630ed712d033f54295f776967532d3f4b46a
Author: Florian Weimer <fweimer>
Date:   Fri Nov 22 22:10:42 2019 +0100

    libio: Disable vtable validation for pre-2.1 interposed handles [BZ #25203]
    
    Commit c402355dfa7807b8e0adb27c009135a7e2b9f1b0 ("libio: Disable
    vtable validation in case of interposition [BZ #23313]") only covered
    the interposable glibc 2.1 handles, in libio/stdfiles.c.  The
    parallel code in libio/oldstdfiles.c needs similar detection logic.
    
    Fixes (again) commit db3476aff19b75c4fdefbe65fcd5f0a90588ba51
    ("libio: Implement vtable verification [BZ #20191]").
    
    Change-Id: Ief6f9f17e91d1f7263421c56a7dc018f4f595c21

Comment 4 Sergey Kolosov 2020-08-31 09:48:00 UTC

Verified with Counter Strike server. It fails on glibc-2.28-105.el8 with "Fatal error: glibc detected an invalid stdio handle" and it runs on glibc-2.28-117.el8.

Comment 7 errata-xmlrpc 2020-11-04 01:32:42 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 (Moderate: glibc security, bug fix, and enhancement update), 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-2020:4444