[PATCH 00/19] x86, mpx updates for 4.2 (take 9)

[Dave Hansen <dave@sr71.net>]

Changes from take 8 / v23:
 * Respond to some of Ingo's comments about get_xsave_field_ptr():
   1. add const in return type, and fix up the cascading need for
      'const' in other parts of the MPX code and tracepoints.
   2. add a local 'fpu' var
   3. Update patch description

Changes from take 7 / v22:
 * Add Thomas's reviewed-by
 * merge with tip/x86/fpu changes
 * Fix tiny spelling nit

Changes from take 6 / v21:
 * Address a bunch of Thomas's review comments.

Changes from take 5 / v20:

 * Fix get_xsave_addr() to consult xstate_bv in anticipation
   of fixes to xsave code.
 * Bug fix for when an VMA being unmapped has neighbors which
   are bounds tables.
 * Rewrite unmapping code.  I didn't do this lightly. It was
   not originally my own code, and I resisted changing it
   because it worked.  But, I started bug chasing and decided
   it was unmaintainable.  The rewrite ended up removing
   about 20% of the unmapping code and made it much simpler.

Changes from take 4 / v19:

 * Do not pass a task_struct around when we are
   really just going to operate on current

Changes from take 3 / v18 (all minor):

 * use DECLARE_EVENT_CLASS()/DEFINE_EVENT() for
   the ranged tracepoints to save 10 lines of code.

Changes from take 2 / v17 (all minor):

 * fix a couple of whitespace borkages caught by checkpatch,
   and a spelling error or two.
 * replace printk with pr_info() for boot disable
 * change trace print format for address intervals
 * fix up variable name in tsk_get_xsave_addr() comment
 * remove tsk_get_xsave_field() GPL export
 * fix up Qiaowei's From:

--

Hi x86 maintainers,

There are a few basic things going on here:
1. Make FPU/xsave code cleaner and less error-prone
2. Add trace points to make kernel and app debugging easier
3. Add a boot-time disable for mpx
4. Rewrite the unmapping code.
5. Support 32-bit binaries to run on 64-bit kernels

This set is also available against tip/x86/fpu (8c05f05edb) in git:

  git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-v24

Dave Hansen (19):
      x86, mpx, xsave: Fix up bad get_xsave_addr() assumptions
      x86, fpu: Wrap get_xsave_addr() to make it safer
      x86, mpx: Use new get_xsave_field_ptr()
      x86, mpx: Cleanup: Do not pass task around when unnecessary
      x86, mpx: remove redundant MPX_BNDCFG_ADDR_MASK
      x86, mpx: Restrict mmap size check to bounds tables
      x86, mpx: boot-time disable
      x86, mpx: trace #BR exceptions
      x86, mpx: trace entry to bounds exception paths
      x86, mpx: Trace the attempts to find bounds tables
      x86, mpx: trace allocation of new bounds tables
      x86: make is_64bit_mm() widely available
      x86, mpx: Add temporary variable to reduce masking
      x86, mpx: new directory entry to addr helper
      x86, mpx: do 32-bit-only cmpxchg for 32-bit apps
      x86, mpx: support 32-bit binaries on 64-bit kernel
      x86, mpx: rewrite unmap code
      x86, mpx: do not count MPX VMAs as neighbors when unmapping
      x86, mpx: allow mixed binaries again

 Documentation/kernel-parameters.txt |   4 +
 arch/x86/include/asm/fpu/xstate.h   |   1 +
 arch/x86/include/asm/mmu_context.h  |  13 +
 arch/x86/include/asm/mpx.h          |  74 ++--
 arch/x86/include/asm/processor.h    |  12 +-
 arch/x86/include/asm/trace/mpx.h    | 132 +++++++
 arch/x86/kernel/cpu/common.c        |  16 +
 arch/x86/kernel/fpu/xstate.c        |  77 ++++-
 arch/x86/kernel/traps.c             |  20 +-
 arch/x86/kernel/uprobes.c           |  10 +-
 arch/x86/mm/mpx.c                   | 514 +++++++++++++++++-----------
 kernel/sys.c                        |   8 +-
 12 files changed, 610 insertions(+), 271 deletions(-)