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SubjectRe: [patch 2/5] -fstack-protector feature: Add the Kconfig option
On Wed, Aug 16, 2006 at 06:50:38PM +0200, Arjan van de Ven wrote:
> Subject: [patch 2/5] Add the Kconfig option for the stackprotector feature
> From: Arjan van de Ven <arjan@linux.intel.com>
>
> This patch adds the config options for -fstack-protector.
>
> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> CC: Andi Kleen <ak@suse.de>
>
> ---
> arch/x86_64/Kconfig | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> Index: linux-2.6.18-rc4-stackprot/arch/x86_64/Kconfig
> ===================================================================
> --- linux-2.6.18-rc4-stackprot.orig/arch/x86_64/Kconfig
> +++ linux-2.6.18-rc4-stackprot/arch/x86_64/Kconfig
> @@ -522,6 +522,30 @@ config SECCOMP
>
> If unsure, say Y. Only embedded should say N here.
>
> +config CC_STACKPROTECTOR
> + bool "Enable -fstack-protector buffer overflow detection (EXPRIMENTAL)"
> + depends on EXPERIMENTAL
> + help
> + This option turns on the -fstack-protector GCC feature. This
> + feature puts, at the beginning of critical functions, a canary
> + value on the stack just before the return address, and validates
> + the value just before actually returning. Stack based buffer
> + overflows (that need to overwrite this return address) now also
> + overwrite the canary, which gets detected and the attack is then
> + neutralized via a kernel panic.
> +
> + This feature requires gcc version 4.2 or above, or a distribution
> + gcc with the feature backported. Older versions are automatically
> + detected and for those versions, this configuration option is ignored.
>...

Please add something like

This feature adds some extra security with a moderate
performance overhead.

to make it easier for a user to decide whether or not to enable this
option.

cu
Adrian

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