linux-hardening - [RFC PATCH 12/12] arm64: hugetlb: use set_pte_at() not set

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Date:   Wed, 26 Jan 2022 18:30:11 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     kvmarm@...ts.cs.columbia.edu, linux-hardening@...r.kernel.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Fuad Tabba <tabba@...gle.com>,
        Quentin Perret <qperret@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: [RFC PATCH 12/12] arm64: hugetlb: use set_pte_at() not set_pte() to provide mm pointer

Switch to set_pte_at() so we can provide the mm pointer to the code that
performs the page table update.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/arm64/mm/hugetlbpage.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index ffb9c229610a..099b28b00f4c 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -252,8 +252,8 @@ void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 
 	ncontig = num_contig_ptes(sz, &pgsize);
 
-	for (i = 0; i < ncontig; i++, ptep++)
-		set_pte(ptep, pte);
+	for (i = 0; i < ncontig; i++, ptep++, addr += pgsize)
+		set_pte_at(mm, addr, ptep, pte);
 }
 
 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
-- 
2.30.2