patches/kernel/0171-x86-mm-64-Improve-the-memory-map-documentation.patch

   1 From fd143ce57a7cfaf015f1c0274b9f071f4046696a Mon Sep 17 00:00:00 2001
   2 From: Andy Lutomirski <luto@kernel.org>
   3 Date: Tue, 12 Dec 2017 07:56:43 -0800
   4 Subject: [PATCH 171/241] x86/mm/64: Improve the memory map documentation
   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 The old docs had the vsyscall range wrong and were missing the fixmap.
  12 Fix both.
  13
  14 There used to be 8 MB reserved for future vsyscalls, but that's long gone.
  15
  16 Signed-off-by: Andy Lutomirski <luto@kernel.org>
  17 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  18 Cc: Borislav Petkov <bp@alien8.de>
  19 Cc: Brian Gerst <brgerst@gmail.com>
  20 Cc: Dave Hansen <dave.hansen@intel.com>
  21 Cc: Dave Hansen <dave.hansen@linux.intel.com>
  22 Cc: David Laight <David.Laight@aculab.com>
  23 Cc: H. Peter Anvin <hpa@zytor.com>
  24 Cc: Josh Poimboeuf <jpoimboe@redhat.com>
  25 Cc: Juergen Gross <jgross@suse.com>
  26 Cc: Kees Cook <keescook@chromium.org>
  27 Cc: Kirill A. Shutemov <kirill@shutemov.name>
  28 Cc: Linus Torvalds <torvalds@linux-foundation.org>
  29 Cc: Peter Zijlstra <peterz@infradead.org>
  30 Signed-off-by: Ingo Molnar <mingo@kernel.org>
  31 (cherry picked from commit 5a7ccf4754fb3660569a6de52ba7f7fc3dfaf280)
  32 Signed-off-by: Andy Whitcroft <apw@canonical.com>
  33 Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
  34 (cherry picked from commit d694898656126d8a04e86f681c8fe34ea57f1b85)
  35 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  36 ---
  37  Documentation/x86/x86_64/mm.txt | 10 ++++++----
  38  1 file changed, 6 insertions(+), 4 deletions(-)
  39
  40 diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
  41 index 3448e675b462..83ca5a3b90ac 100644
  42 --- a/Documentation/x86/x86_64/mm.txt
  43 +++ b/Documentation/x86/x86_64/mm.txt
  44 @@ -19,8 +19,9 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
  45  ffffffef00000000 - fffffffeffffffff (=64 GB) EFI region mapping space
  46  ... unused hole ...
  47  ffffffff80000000 - ffffffff9fffffff (=512 MB)  kernel text mapping, from phys 0
  48 -ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space (variable)
  49 -ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
  50 +ffffffffa0000000 - [fixmap start]   (~1526 MB) module mapping space (variable)
  51 +[fixmap start]   - ffffffffff5fffff kernel-internal fixmap range
  52 +ffffffffff600000 - ffffffffff600fff (=4 kB) legacy vsyscall ABI
  53  ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
  54
  55  Virtual memory map with 5 level page tables:
  56 @@ -41,8 +42,9 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
  57  ffffffef00000000 - fffffffeffffffff (=64 GB) EFI region mapping space
  58  ... unused hole ...
  59  ffffffff80000000 - ffffffff9fffffff (=512 MB)  kernel text mapping, from phys 0
  60 -ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space
  61 -ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
  62 +ffffffffa0000000 - [fixmap start]   (~1526 MB) module mapping space
  63 +[fixmap start]   - ffffffffff5fffff kernel-internal fixmap range
  64 +ffffffffff600000 - ffffffffff600fff (=4 kB) legacy vsyscall ABI
  65  ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
  66
  67  Architecture defines a 64-bit virtual address. Implementations can support
  68 --
  69 2.14.2
  70