diff mbox series

[v1,10/20] arm64: mask out POIndex when modifying a PTE

Message ID 20230927140123.5283-11-joey.gouly@arm.com
State New
Headers show
Series Permission Overlay Extension | expand

Commit Message

Joey Gouly Sept. 27, 2023, 2:01 p.m. UTC 
When a PTE is modified, the POIndex must be masked off so that it can be modified.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
---
 arch/arm64/include/asm/pgtable.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7f7d9b1df4e5..98ccfda05716 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -818,9 +818,10 @@  static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 	 * Normal and Normal-Tagged are two different memory types and indices
 	 * in MAIR_EL1. The mask below has to include PTE_ATTRINDX_MASK.
 	 */
-	const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
+	pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
 			      PTE_PROT_NONE | PTE_VALID | PTE_WRITE | PTE_GP |
-			      PTE_ATTRINDX_MASK;
+			      PTE_ATTRINDX_MASK | PTE_PO_IDX_MASK;
+
 	/* preserve the hardware dirty information */
 	if (pte_hw_dirty(pte))
 		pte = set_pte_bit(pte, __pgprot(PTE_DIRTY));