[PATCH 5.15 517/691] riscv: define ILLEGAL_POINTER_VALUE for 64bit

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5.15-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
@@ -210,6 +210,11 @@ 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 3 if 64BIT






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