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    Subject[patch 2/5] -fstack-protector feature: Add the Kconfig option
    Subject: [patch 2/5] Add the Kconfig option for the stackprotector feature
    From: Arjan van de Ven <>

    This patch adds the config options for -fstack-protector.

    Signed-off-by: Arjan van de Ven <>
    Signed-off-by: Ingo Molnar <>
    CC: Andi Kleen <>

    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.

    + 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.
    + bool "Use stack-protector for all functions"
    + depends on CC_STACKPROTECTOR
    + 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
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      Last update: 2006-08-16 19:15    [W:0.036 / U:6.900 seconds]
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