Patch "mm: don't lose the SOFT_DIRTY flag on mprotect" has been added to the 3.12-stable tree

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This is a note to let you know that I've just added the patch titled

    mm: don't lose the SOFT_DIRTY flag on mprotect

to the 3.12-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:
     mm-don-t-lose-the-soft_dirty-flag-on-mprotect.patch
and it can be found in the queue-3.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 24f91eba18bbfdb27e71a1aae5b3a61b67fcd091 Mon Sep 17 00:00:00 2001
From: Andrey Vagin <avagin@xxxxxxxxxx>
Date: Thu, 30 Jan 2014 15:46:10 -0800
Subject: mm: don't lose the SOFT_DIRTY flag on mprotect

From: Andrey Vagin <avagin@xxxxxxxxxx>

commit 24f91eba18bbfdb27e71a1aae5b3a61b67fcd091 upstream.

The SOFT_DIRTY bit shows that the content of memory was changed after a
defined point in the past.  mprotect() doesn't change the content of
memory, so it must not change the SOFT_DIRTY bit.

This bug causes a malfunction: on the first iteration all pages are
dumped.  On other iterations only pages with the SOFT_DIRTY bit are
dumped.  So if the SOFT_DIRTY bit is cleared from a page by mistake, the
page is not dumped and its content will be restored incorrectly.

This patch does nothing with _PAGE_SWP_SOFT_DIRTY, becase pte_modify()
is called only for present pages.

Fixes commit 0f8975ec4db2 ("mm: soft-dirty bits for user memory changes
tracking").

Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
Acked-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Wen Congyang <wency@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/include/asm/pgtable_types.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -121,7 +121,8 @@
 
 /* Set of bits not changed in pte_modify */
 #define _PAGE_CHG_MASK	(PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |		\
-			 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
+			 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY |	\
+			 _PAGE_SOFT_DIRTY)
 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 
 #define _PAGE_CACHE_MASK	(_PAGE_PCD | _PAGE_PWT)


Patches currently in stable-queue which might be from avagin@xxxxxxxxxx are

queue-3.12/mm-don-t-lose-the-soft_dirty-flag-on-mprotect.patch
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