linux-kernel - [PATCH] riscv: define ILLEGAL_POINTER

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Message-ID: <20240705165632.3216-1-jszhang@kernel.org>
Date: Sat,  6 Jul 2024 00:56:32 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
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 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@...nel.org>
---
 arch/riscv/Kconfig | 5 +++++
 1 file changed, 5 insertions(+)

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
-- 
2.43.0