linux-kernel - [PATCH] LoongArch: Add pgprot

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Message-ID: <20241217073908.3347287-1-chenhuacai@loongson.cn>
Date: Tue, 17 Dec 2024 15:39:08 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	loongson-kernel@...ts.loongnix.cn,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH] LoongArch: Add pgprot_nx() implementation

Commit cca98e9f8b5ebcd964 ("mm: enforce that vmap can't map pages
executable") enforces the W^X protection by not allowing remapping
existing pages as executable. Add LoongArch bits so that LoongArch
can benefit the same protection.

Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/include/asm/pgtable-bits.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/loongarch/include/asm/pgtable-bits.h b/arch/loongarch/include/asm/pgtable-bits.h
index 82cd3a9f094b..45bfc65a0c9f 100644
--- a/arch/loongarch/include/asm/pgtable-bits.h
+++ b/arch/loongarch/include/asm/pgtable-bits.h
@@ -96,6 +96,13 @@
 
 #define _PAGE_IOREMAP		pgprot_val(PAGE_KERNEL_SUC)
 
+#define pgprot_nx pgprot_nx
+
+static inline pgprot_t pgprot_nx(pgprot_t _prot)
+{
+	return __pgprot(pgprot_val(_prot) | _PAGE_NO_EXEC);
+}
+
 #define pgprot_noncached pgprot_noncached
 
 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
-- 
2.43.5