Wily [PATCH 00/22]- Please enable kconfig X86_LEGACY_VM86 for i386

[tim.gardner at canonical.com]

BugLink: http://bugs.launchpad.net/bugs/1499089

There are some folks that would really like to see a non-emulated VM86 mode. As far
as I can tell, upstream believes VM86 security vulnerabilties have been mitigated by
commit 76fc5e7b2355af167dea1a32e93c57fc37900a5b ('x86/vm86: Block non-root vm86(old)
if mmap_min_addr != 0'). Following is a patch set leading up to that point. Not all
are strictly required, some are just scaffolding. Including them should make any
future stable updates simpler.

Please have a look to make sure this patch set isn't reopening VM86 security holes. Otherwise
I plan to apply this before kernel freeze on Thursday Oct 8.

rtg
---------------------------
The following changes since commit 6550d7a9da9d53642233988d5da13faf1659f146:

  UBUNTU: SAUCE: (noup) cxlflash: Fix to escalate to LINK_RESET on login timeout (2015-10-05 06:27:05 -0600)

are available in the git repository at:

  git://kernel.ubuntu.com/rtg/ubuntu-wily.git vm86-lp1499089

for you to fetch changes up to 08c6dbee0c1f4b0d682c7c6e708457b247869498:

  x86/vm86: Fix the misleading CONFIG_VM86 Kconfig help text (2015-10-05 07:48:13 -0600)

----------------------------------------------------------------
Andy Lutomirski (5):
      x86/kconfig/32: Rename CONFIG_VM86 and default it to 'n'
      x86/ldt: Make modify_ldt() optional
      x86/selftests, x86/vm86: Improve entry_from_vm86 selftest
      selftests/x86/vm86: Fix entry_from_vm86 test on 64-bit kernels
      x86/vm86: Block non-root vm86(old) if mmap_min_addr != 0

Brian Gerst (13):
      x86/compat: Define ARCH_WANT_OLD_COMPAT_IPC only for 32-bit compat
      x86/compat: Clean up HAVE_UID16 config
      x86/compat: Separate ia32 and x32 compat ABIs
      x86/entry/vm86: Clean up saved_fs/gs
      x86/entry/vm86: Preserve 'orig_ax'
      x86/entry/vm86: Move userspace accesses to do_sys_vm86()
      x86/vm86: Move vm86 fields out of 'thread_struct'
      x86/vm86: Move fields from 'struct kernel_vm86_struct' to 'struct vm86'
      x86/vm86: Eliminate 'struct kernel_vm86_struct'
      x86/vm86: Use the normal pt_regs area for vm86
      x86/vm86: Clean up vm86.h includes
      x86/vm86: Rename vm86->vm86_info to user_vm86
      x86/vm86: Rename vm86->v86flags and v86mask

Ingo Molnar (2):
      x86/vm86: Move the vm86 IRQ definitions to vm86.h
      x86/vm86: Fix the misleading CONFIG_VM86 Kconfig help text

Tim Gardner (2):
      UBUNTU: [Config] CONFIG_X86_LEGACY_VM86=y, CONFIG_VM86=y for i386
      UBUNTU: [Config] CONFIG_MODIFY_LDT_SYSCALL=y

 arch/x86/Kconfig                               |  61 +++++++++---
 arch/x86/entry/entry_32.S                      |  24 +----
 arch/x86/include/asm/irq_vectors.h             |  10 --
 arch/x86/include/asm/math_emu.h                |   6 +-
 arch/x86/include/asm/mmu.h                     |   2 +
 arch/x86/include/asm/mmu_context.h             |  28 ++++--
 arch/x86/include/asm/processor.h               |  13 +--
 arch/x86/include/asm/syscalls.h                |   1 +
 arch/x86/include/asm/thread_info.h             |  11 ++-
 arch/x86/include/asm/vm86.h                    |  57 ++++++-----
 arch/x86/kernel/Makefile                       |   3 +-
 arch/x86/kernel/cpu/perf_event.c               |   4 +
 arch/x86/kernel/process.c                      |   3 +
 arch/x86/kernel/process_32.c                   |   1 +
 arch/x86/kernel/process_64.c                   |   2 +
 arch/x86/kernel/signal.c                       |   4 +
 arch/x86/kernel/step.c                         |   2 +
 arch/x86/kernel/traps.c                        |   1 +
 arch/x86/kernel/vm86_32.c                      | 400 ++++++++++++++++++++++++++++++++++++++++------------------------------------
 arch/x86/math-emu/get_address.c                |   2 +
 arch/x86/mm/fault.c                            |   7 +-
 debian.master/config/amd64/config.common.amd64 |   1 +
 debian.master/config/config.common.ubuntu      |   3 +-
 debian.master/config/i386/config.common.i386   |   1 +
 drivers/scsi/dpt_i2o.c                         |   3 +
 kernel/sys_ni.c                                |   1 +
 tools/testing/selftests/x86/entry_from_vm86.c  | 144 +++++++++++++++++++++++++---
 27 files changed, 495 insertions(+), 300 deletions(-)