[PATCH 00/14] x86/fpu: Clean up ptrace copying functions

[Ingo Molnar]

This series deobfuscates the ptrace/regset handling functions of the x86 FPU
code. As a side effect it (should ...) fix the bug Rik reported in:

  [PATCH 1/2] x86/fpu: move copyout_from_xsaves bounds check before the copy

but it does not handle the other fix yet:

  [PATCH 2/2] x86/fpu: copy MXCSR & MXCSR_FLAGS with SSE/YMM state

... which needs to be rebased on top of this series.

The code got larger, but it is now a lot more standard and a lot easier to
understand as well.

Only very minimally tested: we should also add various ptrace XSAVES testcases
to tools/testing/selftests/x86/.

Obviously this will have to be backported as a single group of commits - but I'd rather
do that than leave the mess around.

Ingo Molnar (14):
  x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user()
  x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user()
  x86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs
  x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs
  x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs
  x86/fpu: Clean up the parameter definitions of copy_xstate_to_*()
  x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions
  x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods
  x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*()
  x86/fpu: Simplify __copy_xstate_to_kernel() return values
  x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate()
  x86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API
  x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API
  x86/fpu: Flip the parameter order in copy_*_to_xstate()

 arch/x86/include/asm/fpu/xstate.h |   8 +--
 arch/x86/kernel/fpu/regset.c      |  15 +++--
 arch/x86/kernel/fpu/signal.c      |  11 ++--
 arch/x86/kernel/fpu/xstate.c      | 188 ++++++++++++++++++++++++++++++++++++++++++++++------------
 4 files changed, 168 insertions(+), 54 deletions(-)

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2.7.4