Bug 1775816

Summary:	glibc: Disable libio vtable validation for interposed pre-2.1 stdio handles [rhel-7]
Product:	Red Hat Enterprise Linux 7	Reporter:	Florian Weimer <fweimer>
Component:	glibc	Assignee:	Florian Weimer <fweimer>
Status:	CLOSED ERRATA	QA Contact:	qe-baseos-tools-bugs
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.9	CC:	ashankar, codonell, dj, fweimer, mcermak, mnewsome, pfrankli, skolosov
Target Milestone:	rc	Keywords:	Patch, Triaged
Target Release:	7.9
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	glibc-2.17-314.el7	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-09-29 19:20:26 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:	1782202

Description Florian Weimer 2019-11-22 21:18:58 UTC

Bug 1595191 only fixed binaries linked against glibc 2.1 or later. The legacy stdio implementation in libio/oldstdfiles.c needs a similar check for interposition.

Comment 1 Carlos O'Donell 2019-12-09 14:14:10 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 2020-06-19 12:30:38 UTC

Verified with Counter Strike server. It fails on glibc-2.17-313.el7 with "Fatal error: glibc detected an invalid stdio handle" and it runs on glibc-2.17-314.el7.

Comment 6 errata-xmlrpc 2020-09-29 19:20:26 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 (Low: 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-2020:3861