This is a note to let you know that I've just added the patch titled
ARM: mm: use pteval_t to represent page protection values
to the 3.0-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-mm-use-pteval_t-to-represent-page-protection-values.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 864aa04cd02979c2c755cb28b5f4fe56039171c0 Mon Sep 17 00:00:00 2001
From: Will Deacon <[email protected]>
Date: Tue, 18 Sep 2012 19:18:35 +0100
Subject: ARM: mm: use pteval_t to represent page protection values
From: Will Deacon <[email protected]>
commit 864aa04cd02979c2c755cb28b5f4fe56039171c0 upstream.
When updating the page protection map after calculating the user_pgprot
value, the base protection map is temporarily stored in an unsigned long
type, causing truncation of the protection bits when LPAE is enabled.
This effectively means that calls to mprotect() will corrupt the upper
page attributes, clearing the XN bit unconditionally.
This patch uses pteval_t to store the intermediate protection values,
preserving the upper bits for 64-bit descriptors.
Acked-by: Nicolas Pitre <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm/mm/mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -467,7 +467,7 @@ static void __init build_mem_type_table(
}
for (i = 0; i < 16; i++) {
- unsigned long v = pgprot_val(protection_map[i]);
+ pteval_t v = pgprot_val(protection_map[i]);
protection_map[i] = __pgprot(v | user_pgprot);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/virtio-force-vring-descriptors-to-be-allocated-from-lowmem.patch
queue-3.0/arm-mm-use-pteval_t-to-represent-page-protection-values.patch
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