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Bug 1527905

Summary:	gcc: Link libgcc with BIND_NOW
Product:	Red Hat Enterprise Linux 7	Reporter:	Florian Weimer <fweimer>
Component:	gcc	Assignee:	Marek Polacek <mpolacek>
Status:	CLOSED WONTFIX	QA Contact:	Michael Petlan <mpetlan>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.5	CC:	jakub, ohudlick
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1527903	Environment:
Last Closed:	2018-11-13 19:25:04 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:	1527903
Bug Blocks:	1539083, 1527904

Description Florian Weimer 2017-12-20 12:28:27 UTC

+++ This bug was initially created as a clone of Bug #1527903 +++

Bug 1527887 shows that PTHREAD_STACK_MIN is really low on x86-64 and cannot accomodate both a signal handler frame, the libgcc unwinder, and an ld.so trampoline on AVX-512 (where the XSAVE area is around 2.5 KiB, and it is needed twice).

We can immediately free around 2.5 KiB if we link libgcc with BIND_NOW, so that no trampoline is needed at run time.  Linking libgcc with BIND_NOW is desirable hardening, too.