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 V6 7/8] Disable stack protection for decompressor/stub
Date: Fri, 10 Jan 2014 08:30:16 -0800 [thread overview]
Message-ID: <1389371417-379-8-git-send-email-roy.franz@linaro.org> (raw)
In-Reply-To: <1389371417-379-1-git-send-email-roy.franz@linaro.org>
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(-)
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.
--
1.7.10.4
next prev parent reply other threads:[~2014-01-10 16:30 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-10 16:30 [PATCH V6 0/8] Add ARM EFI stub Roy Franz
2014-01-10 16:30 ` [PATCH V6 1/8] efi-stub.txt updates for ARM Roy Franz
2014-01-10 16:30 ` [PATCH V6 2/8] Add shared printk wrapper for consistent prefixing Roy Franz
2014-01-10 16:30 ` [PATCH V6 3/8] Add helper function to get and convert EFI command line Roy Franz
2014-01-13 15:04 ` Matt Fleming
2014-01-14 19:41 ` Roy Franz
2014-01-10 16:30 ` [PATCH V6 4/8] Add shared FDT related functions for ARM/ARM64 Roy Franz
2014-01-10 16:30 ` [PATCH V6 5/8] Add strstr to compressed string.c for ARM Roy Franz
2014-01-10 16:30 ` [PATCH V6 6/8] Add EFI stub " Roy Franz
2014-01-14 9:05 ` Ard Biesheuvel
2014-01-15 1:47 ` Roy Franz
2014-01-15 2:16 ` Roy Franz
2014-01-15 9:46 ` Ard Biesheuvel
2014-01-15 11:47 ` Leif Lindholm
2014-01-14 19:29 ` Rob Herring
2014-01-14 19:35 ` Roy Franz
2014-01-10 16:30 ` Roy Franz [this message]
2014-01-10 16:30 ` [PATCH V6 8/8] Add config EFI_STUB for ARM to Kconfig Roy Franz
2014-01-13 15:07 ` [PATCH V6 0/8] Add ARM EFI stub Matt Fleming
2014-01-14 19:39 ` Roy Franz
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