linux-kernel - [PATCH] arm64/mm: add pud_user_exec() check in pud_user_accessible

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Date:   Tue, 22 Nov 2022 20:31:37 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH] arm64/mm: add pud_user_exec() check in pud_user_accessible_page()

Add check for the executable case in pud_user_accessible_page() too
like what we did for pte and pmd.

Fixes: 42b2547137f5 ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Suggested-by: Will Deacon <will@...nel.org>
Signed-off-by: Liu Shixin <liushixin2@...wei.com>
---
 arch/arm64/include/asm/pgtable.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 17afb09f386f..f1cfc44ef52f 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -682,7 +682,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 #define pud_leaf(pud)		(pud_present(pud) && !pud_table(pud))
 #define pud_valid(pud)		pte_valid(pud_pte(pud))
 #define pud_user(pud)		pte_user(pud_pte(pud))
-
+#define pud_user_exec(pud)	pte_user_exec(pud_pte(pud))
 
 static inline void set_pud(pud_t *pudp, pud_t pud)
 {
@@ -868,7 +868,7 @@ static inline bool pmd_user_accessible_page(pmd_t pmd)
 
 static inline bool pud_user_accessible_page(pud_t pud)
 {
-	return pud_leaf(pud) && pud_user(pud);
+	return pud_leaf(pud) && (pud_user(pud) || pud_user_exec(pud));
 }
 #endif
 
-- 
2.25.1