patches/kernel/0109-x86-mm-Define-_PAGE_TABLE-using-_KERNPG_TABLE.patch

   1 From 19a0f9475a62580729769eb430d5dd38026f0f02 Mon Sep 17 00:00:00 2001
   2 From: Borislav Petkov <bp@suse.de>
   3 Date: Fri, 3 Nov 2017 11:20:28 +0100
   4 Subject: [PATCH 109/233] x86/mm: Define _PAGE_TABLE using _KERNPG_TABLE
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 CVE-2017-5754
  10
  11 ... so that the difference is obvious.
  12
  13 No functionality change.
  14
  15 Signed-off-by: Borislav Petkov <bp@suse.de>
  16 Cc: Linus Torvalds <torvalds@linux-foundation.org>
  17 Cc: Peter Zijlstra <peterz@infradead.org>
  18 Cc: Thomas Gleixner <tglx@linutronix.de>
  19 Link: http://lkml.kernel.org/r/20171103102028.20284-1-bp@alien8.de
  20 Signed-off-by: Ingo Molnar <mingo@kernel.org>
  21 (backported from commit c7da092a1f243bfd1bfb4124f538e69e941882da)
  22 Signed-off-by: Andy Whitcroft <apw@canonical.com>
  23 Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
  24 (cherry picked from commit 8c69b0c03cd24576ac69c36ede00afae76bab464)
  25 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  26 ---
  27  arch/x86/include/asm/pgtable_types.h | 3 +--
  28  1 file changed, 1 insertion(+), 2 deletions(-)
  29
  30 diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
  31 index bf9638e1ee42..01f6dc938ccb 100644
  32 --- a/arch/x86/include/asm/pgtable_types.h
  33 +++ b/arch/x86/include/asm/pgtable_types.h
  34 @@ -121,10 +121,9 @@
  35
  36  #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  37
  38 -#define _PAGE_TABLE    (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  39 -                        _PAGE_ACCESSED | _PAGE_DIRTY)
  40  #define _KERNPG_TABLE  (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  41                          _PAGE_DIRTY)
  42 +#define _PAGE_TABLE    (_KERNPG_TABLE | _PAGE_USER)
  43
  44  /*
  45   * Set of bits not changed in pte_modify.  The pte's
  46 --
  47 2.14.2
  48