siginfo bugfixes and cleanups

Mostly this dealing with aliases of SI_USER, that make it impossible for userspace to tell what kind of siginfo it has received.

Also in this series is the change to ensure we have siginfo initialized so I can rip out the switch in copy_siginfo_to_user for better performance, and to ensure better backwards compatibility as siginfo as generated in the callers is passed to userspace.

There are also fixes for a few other siginfo bugs I have found.

There are cleanups of ifdefs on SEGV_BNDERR and BUS_MCERR_AX that are no longer necessary.

I plan to merge these bug fixes through my siginfo tree, but if you object to them or would prefer to have them go through your arch tree please let me know.

The changes are avaiable as a totality at:
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git siginfo-review

Dmitry V. Levin (1):
sparc: fix compat siginfo ABI regression

Eric W. Biederman (16):
signal/alpha: Document a conflict with SI_USER for SIGFPE signal/sh: Use force_sig_fault in hw_breakpoint_handler signal/nds32: Use force_sig in unhandled_interruption and unhandled_exceptions signal/nds32: Use force_sig(SIGILL) in do_revisn
signal: Ensure every siginfo we send has all bits initialized
signal: Reduce copy_siginfo_to_user to just copy_to_user
signal: Stop special casing TRAP_FIXME and FPE_FIXME in siginfo_layout
signal: Remove SEGV_BNDERR ifdefs
signal: Remove ifdefs for BUS_MCEERR_AR and BUS_MCEERR_AO signal/alpha: Replace FPE_FIXME with FPE_FLTUNK
signal/ia64: Replace FPE_FIXME with FPE_FLTUNK
signal/powerpc: Replace FPE_FIXME with FPE_FLTUNK signal/unicore32: Use FPE_FLTUNK instead of 0 in ucf64_raise_sigfpe
signal: Add TRAP_UNK si_code for undiagnosted trap exceptions signal/alpha: Replace TRAP_FIXME with TRAP_UNK
signal/powerpc: Replace TRAP_FIXME with TRAP_UNK

 arch/alpha/include/uapi/asm/siginfo.h     |  14 ----
 arch/alpha/kernel/osf_sys.c               |   3 +-
 arch/alpha/kernel/signal.c                |   2 +
 arch/alpha/kernel/traps.c                 |  11 ++-
 arch/alpha/mm/fault.c                     |   2 +
 arch/arc/mm/fault.c                       |   2 +
 arch/arm/kernel/ptrace.c                  |   1 +
 arch/arm/kernel/swp_emulate.c             |   1 +
 arch/arm/kernel/traps.c                   |   5 ++
 arch/arm/mm/alignment.c                   |   1 +
 arch/arm/mm/fault.c                       |   4 +
 arch/arm/vfp/vfpmodule.c                  |   3 +-
 arch/arm64/kernel/fpsimd.c                |   2 +-
 arch/arm64/kernel/sys_compat.c            |   1 +
 arch/arm64/kernel/traps.c                 |   1 +
 arch/arm64/mm/fault.c                     |  18 +++--
 arch/c6x/kernel/traps.c                   |   1 +
 arch/hexagon/kernel/traps.c               |   1 +
 arch/hexagon/mm/vm_fault.c                |   1 +
 arch/ia64/include/uapi/asm/siginfo.h      |   7 --
 arch/ia64/kernel/brl_emu.c                |   1 +
 arch/ia64/kernel/signal.c                 |   2 +
 arch/ia64/kernel/traps.c                  |  31 ++++++--
 arch/ia64/kernel/unaligned.c              |   1 +
 arch/ia64/mm/fault.c                      |   4 +-
 arch/m68k/kernel/traps.c                  |   2 +
 arch/microblaze/kernel/exceptions.c       |   1 +
 arch/microblaze/mm/fault.c                |   4 +-
 arch/mips/mm/fault.c                      |   1 +
 arch/nds32/kernel/traps.c                 |  19 ++---
 arch/nds32/mm/fault.c                     |   1 +
 arch/nios2/kernel/traps.c                 |   1 +
 arch/openrisc/kernel/traps.c              |   5 +-
 arch/openrisc/mm/fault.c                  |   1 +
 arch/parisc/kernel/ptrace.c               |   1 +
 arch/parisc/kernel/traps.c                |   2 +
 arch/parisc/kernel/unaligned.c            |   1 +
 arch/parisc/math-emu/driver.c             |   1 +
 arch/parisc/mm/fault.c                    |   1 +
 arch/powerpc/include/uapi/asm/siginfo.h   |  15 ----
 arch/powerpc/kernel/process.c             |   1 +
 arch/powerpc/kernel/traps.c               |  13 ++--
 arch/powerpc/mm/fault.c                   |   1 +
 arch/powerpc/platforms/cell/spufs/fault.c |   2 +-
 arch/riscv/kernel/traps.c                 |   1 +
 arch/s390/kernel/traps.c                  |   5 +-
 arch/s390/mm/fault.c                      |   2 +
 arch/sh/kernel/hw_breakpoint.c            |   9 +--
 arch/sh/kernel/traps_32.c                 |   2 +
 arch/sh/math-emu/math.c                   |   1 +
 arch/sh/mm/fault.c                        |   1 +
 arch/sparc/include/uapi/asm/siginfo.h     |   7 --
 arch/sparc/kernel/process_64.c            |   1 +
 arch/sparc/kernel/sys_sparc_32.c          |   1 +
 arch/sparc/kernel/traps_32.c              |  12 ++-
 arch/sparc/kernel/traps_64.c              |  16 +++-
 arch/sparc/kernel/unaligned_32.c          |   1 +
 arch/sparc/mm/fault_32.c                  |   1 +
 arch/sparc/mm/fault_64.c                  |   1 +
 arch/um/kernel/trap.c                     |   2 +
 arch/unicore32/kernel/fpu-ucf64.c         |   8 +-
 arch/unicore32/mm/fault.c                 |   3 +
 arch/x86/entry/vsyscall/vsyscall_64.c     |   2 +-
 arch/x86/kernel/ptrace.c                  |   2 +-
 arch/x86/kernel/signal_compat.c           |   2 +-
 arch/x86/kernel/traps.c                   |   3 +
 arch/x86/kernel/umip.c                    |   1 +
 arch/x86/kvm/mmu.c                        |   1 +
 arch/x86/mm/fault.c                       |   1 +
 arch/xtensa/kernel/traps.c                |   1 +
 arch/xtensa/mm/fault.c                    |   1 +
 fs/signalfd.c                             |  15 +---
 include/linux/ptrace.h                    |   1 -
 include/linux/tracehook.h                 |   1 +
 include/uapi/asm-generic/siginfo.h        |   3 +-
 kernel/signal.c                           | 123 +++---------------------------
 virt/kvm/arm/mmu.c                        |   1 +
 77 files changed, 194 insertions(+), 231 deletions(-)