| Message ID | 20240705165632.3216-1-jszhang@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | riscv: define ILLEGAL_POINTER_VALUE for 64bit | expand |
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c51b32a8ddff..c992eabbd002 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -313,6 +313,11 @@ 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
This is used in poison.h for poison pointer offset. Based on current SV39, SV48 and SV59 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 <jszhang@kernel.org> --- arch/riscv/Kconfig | 5 +++++ 1 file changed, 5 insertions(+)