This is a note to let you know that I've just added the patch titled
ARM: 7654/1: Preserve L_PTE_VALID in pte_modify()
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-7654-1-preserve-l_pte_valid-in-pte_modify.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 69dde4c52dbac2891b49ff9723d9c84efc5baf6f Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Mon, 18 Feb 2013 17:51:20 +0100
Subject: ARM: 7654/1: Preserve L_PTE_VALID in pte_modify()
From: Catalin Marinas <catalin.marinas@xxxxxxx>
commit 69dde4c52dbac2891b49ff9723d9c84efc5baf6f upstream.
Following commit 26ffd0d4 (ARM: mm: introduce present, faulting entries
for PAGE_NONE), if a page has been mapped as PROT_NONE, the L_PTE_VALID
bit is cleared by the set_pte_ext() code. With LPAE the software and
hardware pte share the same location and subsequent modifications of pte
range (change_protection()) will leave the L_PTE_VALID bit cleared.
This patch adds the L_PTE_VALID bit to the newprot mask in pte_modify().
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Reported-by: Subash Patel <subash.rp@xxxxxxxxxxx>
Tested-by: Subash Patel <subash.rp@xxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/include/asm/pgtable.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -240,7 +240,8 @@ static inline pte_t pte_mkspecial(pte_t
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
- const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER | L_PTE_NONE;
+ const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER |
+ L_PTE_NONE | L_PTE_VALID;
pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
return pte;
}
Patches currently in stable-queue which might be from catalin.marinas@xxxxxxx are
queue-3.8/arm-7654-1-preserve-l_pte_valid-in-pte_modify.patch
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