Bug 1338672 – glibc: GCC 6 enablement for struct sockaddr_storage

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Bug 1338672 - glibc: GCC 6 enablement for struct sockaddr_storage

Summary:	glibc: GCC 6 enablement for struct sockaddr_storage

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	glibc (Show other bugs)
Sub Component:
Version:	7.3
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	DJ Delorie
QA Contact:	Sergey Kolosov
Docs Contact:

URL:
Whiteboard:
Keywords:	Patch

Depends On:	1337291
Blocks:	1413146 1338673
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Reported:	2016-05-23 04:47 EDT by Florian Weimer
Modified:	2017-08-01 14:06 EDT (History)
CC List:	6 users (show)

See Also:	1338673
Fixed In Version:	glibc-2.17-171.el7
Doc Type:	Bug Fix
Doc Text:	Cause: New optimizations in GCC 6 may cause portions of struct sockaddr to not be copied in a simple assignment operation when aliasing is enabled. Does not affect GCC prior to version 6, including the bundled RHEL 7 gcc. Consequence: Programs might get invalid data in copied structures. Fix: With this patch, the padding is changed such that there are no undefined regions in the structure, forcing gcc to copy all data. Result: Programs should no longer see uninitialized data in copied struct sockaddrs.
Story Points:	---
Clone Of:	1337291
Environment:
Last Closed:	2017-08-01 14:06:55 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
GNU Compiler Collection	71120	None	None	None	2016-05-23 04:47 EDT
Sourceware	20111	None	None	None	2016-05-23 04:47 EDT
Red Hat Product Errata	RHSA-2017:1916	normal	SHIPPED_LIVE	Moderate: glibc security, bug fix, and enhancement update	2017-08-01 14:05:43 EDT

Groups: None (edit)

Description Florian Weimer 2016-05-23 04:47:12 EDT

+++ This bug was initially created as a clone of Bug #1337291 +++

The current struct sockaddr_storage definition causes problems with GCC 6 which are not fixed by -fno-strict-aliasing.  We need to backport a definition which compensates for this.

Comment 6 errata-xmlrpc 2017-08-01 14:06:55 EDT

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-2017:1916

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