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    Subject[PATCH 3.13.y-ckt 40/85] arm64: kconfig: Move LIST_POISON to a safe value
    Date
    3.13.11-ckt28 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jeff Vander Stoep <jeffv@google.com>

    commit bf0c4e04732479f650ff59d1ee82de761c0071f0 upstream.

    Move the poison pointer offset to 0xdead000000000000, a
    recognized value that is not mappable by user-space exploits.

    Acked-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Thierry Strudel <tstrudel@google.com>
    Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    arch/arm64/Kconfig | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
    index bf0ed5d..239635b 100644
    --- a/arch/arm64/Kconfig
    +++ b/arch/arm64/Kconfig
    @@ -58,6 +58,10 @@ config NO_IOPORT
    config STACKTRACE_SUPPORT
    def_bool y

    +config ILLEGAL_POINTER_VALUE
    + hex
    + default 0xdead000000000000
    +
    config LOCKDEP_SUPPORT
    def_bool y

    --
    1.9.1


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