linux-kernel - [tip:x86/vdso] x86, vdso32: Disable stack protector, adjust optimizations

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Date:	Thu, 6 Mar 2014 09:51:56 -0800
From:	"tip-bot for H. Peter Anvin" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, luto@...capital.net, hpa@...or.com,
	mingo@...nel.org, stefani@...bold.net, tglx@...utronix.de,
	hpa@...ux.intel.com
Subject: [tip:x86/vdso] x86, vdso32: Disable stack protector,
  adjust optimizations

Commit-ID:  7ed5ee279499a02bf35c77f0a91d657c24f6474e
Gitweb:     http://git.kernel.org/tip/7ed5ee279499a02bf35c77f0a91d657c24f6474e
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Thu, 6 Mar 2014 09:47:20 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 6 Mar 2014 09:47:20 -0800

x86, vdso32: Disable stack protector, adjust optimizations

For the 32-bit VDSO, match the 64-bit VDSO in:

1. Disable the stack protector.
2. Use -fno-omit-frame-pointer for user space debugging sanity.
3. Use -foptimize-sibling-calls like the 64-bit VDSO does.

Reported-by: Ingo Molnar <mingo@...nel.org>
Cc: Stefani Seibold <stefani@...bold.net>
Cc: Andy Lutomirski <luto@...capital.net>
Link: http://lkml.kernel.org/r/1393881143-3569-13-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/vdso/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile
index 6cef7a1..55e76eb 100644
--- a/arch/x86/vdso/Makefile
+++ b/arch/x86/vdso/Makefile
@@ -151,6 +151,9 @@ KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
+KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) 
+KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
+KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
 $(vdso32-images:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 
 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
--
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