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Bug 1527905 - gcc: Link libgcc with BIND_NOW
Summary: gcc: Link libgcc with BIND_NOW
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: gcc
Version: 7.5
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Marek Polacek
QA Contact: Michael Petlan
URL:
Whiteboard:
Depends On: 1527903
Blocks: Fedora28BuildFlags 1527904
TreeView+ depends on / blocked
 
Reported: 2017-12-20 12:28 UTC by Florian Weimer
Modified: 2018-11-13 19:25 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1527903
Environment:
Last Closed: 2018-11-13 19:25:04 UTC
Target Upstream Version:
Embargoed:

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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.
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