Bug 122708

Summary: X.org doesn't work out of box with exec-shield
Product: [Fedora] Fedora Reporter: Mike A. Harris <mharris>
Component: xorg-x11Assignee: Mike A. Harris <mharris>
Status: CLOSED RAWHIDE QA Contact: David Lawrence <dkl>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhide   
Target Milestone: ---   
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Hardware: All   
OS: Linux   
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Fixed In Version: 6.7.0-2 Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2004-05-07 11:58:48 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 114961    

Description Mike A. Harris 2004-05-07 10:54:52 UTC 
The assembler files in stock X and Mesa, do not use GNU stacks on
Linux systems, which means they will not work properly with
exec-shield.  I fixed this problem in XFree86 4.3.0 by writing the
XFree86-4.3.0-redhat-exec-shield-GNU-stack.patch patch, which
patched every assembler file to include .note.GNU-stack sections.

While that is considered a cleaner solution, my patch was non-portable
to non-GNU systems, so unsuitable for upstream acceptance as-was.  The
patch was disabled for X.org due to failure to apply, and didn't get
ported forward yet.

Nobody's noticed that X doesn't work with exec-shield aparently until
now.  ;o)

Jakub suggested an alternate solution of passing the assembler
"-Wa,--noexecstack", which is a simpler workaround for now instead
of porting patches each release or spending time to make sure the
patch works on every OS in existance.
Comment 1 Mike A. Harris 2004-05-07 10:58:34 UTC 
Modified AsCmd as follows in 6.7.0-2

-#define AsCmd               CcCmd -c -x assembler
+#define AsCmd               CcCmd -c -x assembler -Wa,--noexecstack