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From: Jisheng Zhang <jszhang@kernel.org>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] riscv: define ILLEGAL_POINTER_VALUE for 64bit
Date: Sat,  6 Jul 2024 01:02:10 +0800	[thread overview]
Message-ID: <20240705170210.3236-1-jszhang@kernel.org> (raw)

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@kernel.org>
---

Since v1:
 - fix typo:s/SV59/SV57

 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


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WARNING: multiple messages have this Message-ID (diff)
From: Jisheng Zhang <jszhang@kernel.org>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] riscv: define ILLEGAL_POINTER_VALUE for 64bit
Date: Sat,  6 Jul 2024 01:02:10 +0800	[thread overview]
Message-ID: <20240705170210.3236-1-jszhang@kernel.org> (raw)

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@kernel.org>
---

Since v1:
 - fix typo:s/SV59/SV57

 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


             reply	other threads:[~2024-07-05 17:16 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-07-05 17:02 Jisheng Zhang [this message]
2024-07-05 17:02 ` [PATCH v2] riscv: define ILLEGAL_POINTER_VALUE for 64bit Jisheng Zhang
2024-07-06  0:50 ` Jisheng Zhang
2024-07-06  0:50   ` Jisheng Zhang
2024-09-15  6:55   ` Palmer Dabbelt
2024-09-15  6:55     ` Palmer Dabbelt
2024-09-17 13:00 ` patchwork-bot+linux-riscv
2024-09-17 13:00   ` patchwork-bot+linux-riscv

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