linux-kernel - [PATCH AUTOSEL 5.4 048/130] MIPS: vdso: Use vma page protection for remapping

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Message-Id: <20201223021813.2791612-48-sashal@kernel.org>
Date:   Tue, 22 Dec 2020 21:16:51 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>, linux-mips@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 048/130] MIPS: vdso: Use vma page protection for remapping

From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>

[ Upstream commit 724d554a117a0552c2c982f0b5cd1d685274d678 ]

MIPS protection bits are setup during runtime so using defines like
PAGE_READONLY ignores these runtime changes. To fix this we simply
use the page protection of the setup vma.

Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/kernel/vdso.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c
index bc35f8499111b..cea83d2866e34 100644
--- a/arch/mips/kernel/vdso.c
+++ b/arch/mips/kernel/vdso.c
@@ -157,7 +157,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 		gic_pfn = virt_to_phys(mips_gic_base + MIPS_GIC_USER_OFS) >> PAGE_SHIFT;
 
 		ret = io_remap_pfn_range(vma, base, gic_pfn, gic_size,
-					 pgprot_noncached(PAGE_READONLY));
+					 pgprot_noncached(vma->vm_page_prot));
 		if (ret)
 			goto out;
 	}
@@ -165,7 +165,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	/* Map data page. */
 	ret = remap_pfn_range(vma, data_addr,
 			      virt_to_phys(vdso_data) >> PAGE_SHIFT,
-			      PAGE_SIZE, PAGE_READONLY);
+			      PAGE_SIZE, vma->vm_page_prot);
 	if (ret)
 		goto out;
 
-- 
2.27.0