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Message-Id: <1154102627.6416.13.camel@laptopd505.fenrus.org> Date: Fri, 28 Jul 2006 18:03:46 +0200 From: Arjan van de Ven <arjan@...ux.intel.com> To: linux-kernel@...r.kernel.org Cc: akpm@...l.org, ak@...e.de Subject: [patch 2/5] Add the Kconfig option for the stackprotector feature Subject: [patch 2/5] Add the Kconfig option for the stackprotector feature From: Arjan van de Ven <arjan@...ux.intel.com> This patch adds the config options for -fstack-protector. Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com> Signed-off-by: Ingo Molnar <mingo@...e.hu> CC: Andi Kleen <ak@...e.de> --- arch/x86_64/Kconfig | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) Index: linux-2.6.18-rc2-git5-stackprot/arch/x86_64/Kconfig =================================================================== --- linux-2.6.18-rc2-git5-stackprot.orig/arch/x86_64/Kconfig +++ linux-2.6.18-rc2-git5-stackprot/arch/x86_64/Kconfig @@ -522,6 +522,31 @@ 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 + default n + help + This option turns on the -fstack-protector GCC feature that is new + in GCC version 4.1. 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. + + NOTE + This feature requires gcc version 4.2 or above, or a distribution + gcc with the feature backported. For older gcc versions, this is a NOP. + +config CC_STACKPROTECTOR_ALL + bool "Use stack-protector for all functions" + depends on CC_STACKPROTECTOR + default n + help + Normally, GCC only inserts the canary value protection for + functions that use large-ish on-stack buffers. By enabling + this option, GCC will be asked to do this for ALL functions. + source kernel/Kconfig.hz config REORDER - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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