[OE-core] [PATCH 1/2] kexec-tools: disable the GCC's stack protection for purgatory code

[wenzong.fan at windriver.com]

From: Kevin Hao <kexin.hao at windriver.com>

If the GCC's stack protection is enabled by default, the purgatory will
also be built with this option. But it makes no sense to enable this
for the purgatory code, and would cause error when we are trying to
relocate the purgatory codes because symbol like __stack_chk_fail is
unresolved. Instead of disabling this for some archs specifically,
disable it for all the archs.

Signed-off-by: Kevin Hao <kexin.hao at windriver.com>
Signed-off-by: Wenzong Fan <wenzong.fan at windriver.com>
---
 ...urgatory-Disabling-GCC-s-stack-protection.patch | 64 ++++++++++++++++++++++
 meta/recipes-kernel/kexec/kexec-tools_2.0.9.bb     |  1 +
 2 files changed, 65 insertions(+)
 create mode 100644 meta/recipes-kernel/kexec/kexec-tools/0001-purgatory-Disabling-GCC-s-stack-protection.patch

diff --git a/meta/recipes-kernel/kexec/kexec-tools/0001-purgatory-Disabling-GCC-s-stack-protection.patch b/meta/recipes-kernel/kexec/kexec-tools/0001-purgatory-Disabling-GCC-s-stack-protection.patch
new file mode 100644
index 0000000..74a8387
--- /dev/null
+++ b/meta/recipes-kernel/kexec/kexec-tools/0001-purgatory-Disabling-GCC-s-stack-protection.patch
@@ -0,0 +1,64 @@
+From 8227f5a583ad4523059ba2531263e625ac01cd40 Mon Sep 17 00:00:00 2001
+From: Kevin Hao <kexin.hao at windriver.com>
+Date: Tue, 28 Apr 2015 20:25:12 +0800
+Subject: [PATCH] purgatory: Disabling GCC's stack protection
+
+If the GCC's stack protection is enabled by default, the purgatory will
+also be built with this option. But it makes no sense to enable this
+for the purgatory code, and would cause error when we are trying to
+relocate the purgatory codes because symbol like __stack_chk_fail is
+unresolved. Instead of disabling this for some archs specifically,
+disable it for all the archs.
+
+Upstream-Status: Pending
+
+Signed-off-by: Kevin Hao <kexin.hao at windriver.com>
+Signed-off-by: Wenzong Fan <wenzong.fan at windriver.com>
+---
+ purgatory/Makefile            | 3 ++-
+ purgatory/arch/ppc64/Makefile | 2 +-
+ purgatory/arch/s390/Makefile  | 1 -
+ 3 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/purgatory/Makefile b/purgatory/Makefile
+index 1945702..a25b262 100644
+--- a/purgatory/Makefile
++++ b/purgatory/Makefile
+@@ -47,7 +47,8 @@ purgatory/sha256.o: $(srcdir)/util_lib/sha256.c
+ $(PURGATORY): CC=$(TARGET_CC)
+ $(PURGATORY): CFLAGS+=$(PURGATORY_EXTRA_CFLAGS) \
+ 		      $($(ARCH)_PURGATORY_EXTRA_CFLAGS) \
+-		      -Os -fno-builtin -ffreestanding
++		      -Os -fno-builtin -ffreestanding \
++		      -fno-stack-protector
+ 
+ $(PURGATORY): CPPFLAGS=$($(ARCH)_PURGATORY_EXTRA_CFLAGS) \
+ 			-I$(srcdir)/purgatory/include \
+diff --git a/purgatory/arch/ppc64/Makefile b/purgatory/arch/ppc64/Makefile
+index 6c58fa2..8ca2719 100644
+--- a/purgatory/arch/ppc64/Makefile
++++ b/purgatory/arch/ppc64/Makefile
+@@ -9,7 +9,7 @@ ppc64_PURGATORY_SRCS += purgatory/arch/ppc64/console-ppc64.c
+ ppc64_PURGATORY_SRCS += purgatory/arch/ppc64/crashdump_backup.c
+ ppc64_PURGATORY_SRCS += purgatory/arch/ppc64/misc.S
+ 
+-ppc64_PURGATORY_EXTRA_CFLAGS += -m64 -msoft-float -fno-stack-protector	\
++ppc64_PURGATORY_EXTRA_CFLAGS += -m64 -msoft-float \
+ 				-fno-exceptions
+ ppc64_PURGATORY_EXTRA_ASFLAGS += -m64
+ ifeq ($(SUBARCH),BE)
+diff --git a/purgatory/arch/s390/Makefile b/purgatory/arch/s390/Makefile
+index 09749bd..c94cc3c 100644
+--- a/purgatory/arch/s390/Makefile
++++ b/purgatory/arch/s390/Makefile
+@@ -2,7 +2,6 @@
+ # Purgatory s390
+ #
+ 
+-s390_PURGATORY_EXTRA_CFLAGS += -fno-stack-protector
+ s390_PURGATORY_SRCS += purgatory/arch/s390/console-s390.c
+ s390_PURGATORY_SRCS += purgatory/arch/s390/setup-s390.S
+ s390_PURGATORY_SRCS += purgatory/arch/s390/purgatory-s390.c
+-- 
+1.9.1
+
diff --git a/meta/recipes-kernel/kexec/kexec-tools_2.0.9.bb b/meta/recipes-kernel/kexec/kexec-tools_2.0.9.bb
index 36e4c15..db5649b 100644
--- a/meta/recipes-kernel/kexec/kexec-tools_2.0.9.bb
+++ b/meta/recipes-kernel/kexec/kexec-tools_2.0.9.bb
@@ -5,6 +5,7 @@ EXTRA_OECONF = " --with-zlib=yes"
 SRC_URI += "file://kexec-tools-Refine-kdump-device_tree-sort.patch \
             file://kexec-aarch64.patch \
             file://kexec-x32.patch \
+            file://0001-purgatory-Disabling-GCC-s-stack-protection.patch \
          "
 
 SRC_URI[md5sum] = "4ecb7ab7ad9eb6ce413899bdb07a8426"
-- 
1.9.1