arm64: kconfig: Move LIST_POISON to a safe value

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

Cc: <stable@vger.kernel.org>
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>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 78b89fa337ee33f303241f8c4c5e276628e3051c..f3d751a342f00266f2604c0b4367abb9e8fa4958 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -106,6 +106,10 @@ config NO_IOPORT_MAP
 config STACKTRACE_SUPPORT
        def_bool y
 
+config ILLEGAL_POINTER_VALUE
+       hex
+       default 0xdead000000000000
+
 config LOCKDEP_SUPPORT
        def_bool y