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Date: Mon, 5 Mar 2018 20:18:24 +0900
From: Jinbum Park <jinb.park7@...il.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Cc: gregkh@...uxfoundation.org, tglx@...utronix.de,
kstewart@...uxfoundation.org, luto@...capital.net,
dsafonov@...tuozzo.com, keescook@...omium.org, will.deacon@....com,
mark.rutland@....com, danielmicay@...il.com, arnd@...db.de,
catalin.marinas@....com
Subject: [PATCH v2 2/2] arm: Kconfig: Add ARCH_HAS_FORTIFY_SOURCE
CONFIG_FORTIFY_SOURCE detects various overflows at compile-time.
(6974f0c4555e ("include/linux/string.h:
add the option of fortified string.h functions)
ARCH_HAS_FORTIFY_SOURCE means that the architecture can be built and
run with CONFIG_FORTIFY_SOURCE.
Since ARM can be built and run with that flag like other architectures,
select ARCH_HAS_FORTIFY_SOURCE as default.
Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Jinbum Park <jinb.park7@...il.com>
---
v2: Add fortify_panic() in arch/arm/boot/compressed/misc.c,
Because there will be a build error if without that function.
---
arch/arm/Kconfig | 1 +
arch/arm/boot/compressed/misc.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7e3d535..3765336 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -7,6 +7,7 @@ config ARM
select ARCH_HAS_DEBUG_VIRTUAL if MMU
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
+ select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
index 16a8a80..4a247ac 100644
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -167,3 +167,8 @@ void __stack_chk_fail(void)
else
putstr(" done, booting the kernel.\n");
}
+
+void fortify_panic(const char *name)
+{
+ error("detected buffer overflow");
+}
--
1.9.1
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