arm64: kconfig: Move LIST_POISON to a safe value

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7796af4b1d6f65f6352ed40cd6dfcaf580cfd63d..99fe93a5021ffd15da8ee1b7da37e6f185f0101d 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -101,6 +101,10 @@ config NO_IOPORT_MAP
 config STACKTRACE_SUPPORT
        def_bool y
 
+config ILLEGAL_POINTER_VALUE
+       hex
+       default 0xdead000000000000
+
 config LOCKDEP_SUPPORT
        def_bool y