From 5c178472af247c7b50f962495bb7462ba453b9fb Mon Sep 17 00:00:00 2001 From: Jisheng Zhang Date: Sat, 6 Jul 2024 01:02:10 +0800 Subject: [PATCH] riscv: define ILLEGAL_POINTER_VALUE for 64bit This is used in poison.h for poison pointer offset. Based on current SV39, SV48 and SV57 vm layout, 0xdead000000000000 is a proper value that is not mappable, this can avoid potentially turning an oops to an expolit. Signed-off-by: Jisheng Zhang Fixes: fbe934d69eb7 ("RISC-V: Build Infrastructure") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240705170210.3236-1-jszhang@kernel.org Signed-off-by: Palmer Dabbelt --- arch/riscv/Kconfig | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 4871220061c45..31d9417923697 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -320,6 +320,11 @@ config GENERIC_HWEIGHT config FIX_EARLYCON_MEM def_bool MMU +config ILLEGAL_POINTER_VALUE + hex + default 0 if 32BIT + default 0xdead000000000000 if 64BIT + config PGTABLE_LEVELS int default 5 if 64BIT -- 2.39.5