| Message ID | 1385595115-21488-6-git-send-email-roy.franz@linaro.org |
|---|---|
| State | New |
| Headers | show
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[64.2.3.195]) by mx.google.com with ESMTPSA id p5sm41764439igj.10.2013.11.27.15.32.11 for <multiple recipients> (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Nov 2013 15:32:12 -0800 (PST) From: Roy Franz <roy.franz@linaro.org> To: linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, matt.fleming@intel.com, linux@arm.linux.org.uk Cc: leif.lindholm@linaro.org, grant.likely@linaro.org, dave.martin@arm.com, msalter@redhat.com, patches@linaro.org, Roy Franz <roy.franz@linaro.org> Subject: [PATCH V5 5/6] Disable stack protection for decompressor/stub Date: Wed, 27 Nov 2013 15:31:54 -0800 Message-Id: <1385595115-21488-6-git-send-email-roy.franz@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1385595115-21488-1-git-send-email-roy.franz@linaro.org> References: <1385595115-21488-1-git-send-email-roy.franz@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. 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diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index c0c7fee..7974791 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -132,7 +132,7 @@ ORIG_CFLAGS := $(KBUILD_CFLAGS) KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS)) endif -ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj) +ccflags-y := -fpic -mno-single-pic-base -fno-builtin -fno-stack-protector -I$(obj) asflags-y := -DZIMAGE # Supply kernel BSS size to the decompressor via a linker symbol.
The ARM decompressor/EFI stub do not implement the functions (__stack_chk_guard_setup, etc) that are required for support of stack protection. The actual enablement of stack protection is controlled by heuristics in GCC, which the code added for the EFI stub triggers when CONFIG_STACKPROTECTOR is set. Even with CONFIG_STACKPROTECTOR set, the decompressor was never compiled with stack protection actually enabled. Adding -fno-stack-protector to the decompressor/stub build keeps it building without stack protection as it has always been built. The x86 decompressor/stub is also built with -fno-stack-protector. Signed-off-by: Roy Franz <roy.franz@linaro.org> --- arch/arm/boot/compressed/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)