linux-kernel - [PATCH 5.15 144/530] ARM: 9247/1: mm: set readonly for MT_MEMORY_RO with ARM

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Message-Id: <20221024113051.591241125@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:28:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kefeng Wang <wangkefeng.wang@...wei.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 144/530] ARM: 9247/1: mm: set readonly for MT_MEMORY_RO with ARM_LPAE

From: Wang Kefeng <wangkefeng.wang@...wei.com>

[ Upstream commit 14ca1a4690750bb54e1049e49f3140ef48958a6e ]

MT_MEMORY_RO is introduced by commit 598f0a99fa8a ("ARM: 9210/1:
Mark the FDT_FIXED sections as shareable"), which is a readonly
memory type for FDT area, but there are some different between
ARM_LPAE and non-ARM_LPAE, we need to setup PMD_SECT_AP2 and
L_PMD_SECT_RDONLY for MT_MEMORY_RO when ARM_LAPE enabled.

non-ARM_LPAE	0xff800000-0xffa00000           2M PGD KERNEL      ro NX SHD
ARM_LPAE	0xff800000-0xffc00000           4M PMD RW NX SHD
ARM_LPAE+fix	0xff800000-0xffc00000           4M PMD ro NX SHD

Fixes: 598f0a99fa8a ("ARM: 9210/1: Mark the FDT_FIXED sections as shareable")
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/mm/mmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index cd17e324aa51..83a91e0ab848 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -300,7 +300,11 @@ static struct mem_type mem_types[] __ro_after_init = {
 		.prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
 			     L_PTE_XN | L_PTE_RDONLY,
 		.prot_l1   = PMD_TYPE_TABLE,
+#ifdef CONFIG_ARM_LPAE
+		.prot_sect = PMD_TYPE_SECT | L_PMD_SECT_RDONLY | PMD_SECT_AP2,
+#else
 		.prot_sect = PMD_TYPE_SECT,
+#endif
 		.domain    = DOMAIN_KERNEL,
 	},
 	[MT_ROM] = {
-- 
2.35.1