4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jisheng Zhang <jszhang@xxxxxxxxxx>
commit 5c178472af247c7b50f962495bb7462ba453b9fb upstream.
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 <jszhang@xxxxxxxxxx>
Fixes: fbe934d69eb7 ("RISC-V: Build Infrastructure")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20240705170210.3236-1-jszhang@xxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/Kconfig | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -84,6 +84,11 @@ config GENERIC_CSUM
config GENERIC_HWEIGHT
def_bool y
+config ILLEGAL_POINTER_VALUE
+ hex
+ default 0 if 32BIT
+ default 0xdead000000000000 if 64BIT
+
config PGTABLE_LEVELS
int
default 3 if 64BIT
