[RFC PATCH 00/25] Kernel userspace access/execution prevention with hash translation

["Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>]

This patch series implements KUAP and KUEP with hash translation mode using
memory keys. The kernel now uses memory protection key 3 to control access
to the kernel. Kernel page table entries are now configured with key 3.
Access to locations configured with any other key value is denied when in
kernel mode (MSR_PR=0). This includes userspace which is by default configured
with key 0.

Aneesh Kumar K.V (25):
  powerpc/book3s64/pkeys: Mark all the pkeys above max pkey as reserved
  powerpc/book3s64/pkeys: Enable MMU_FTR_PKEY
  powerpc/book3s64/kuep: Add MMU_FTR_KUEP
  powerpc/book3s64/pkeys: Use execute_pkey_disable static key
  powerpc/book3s64/pkeys: Use MMU_FTR_PKEY instead of pkey_disabled
    static key
  powerpc/book3s64/kuap: Move KUAP related function outside radix
  powerpc/book3s64/kuep: Move KUEP related function outside radix
  powerpc/book3s64/kuap: Rename MMU_FTR_RADIX_KUAP to MMU_FTR_KUAP
  powerpc/book3s64/kuap/kuep: Make KUAP and KUEP a subfeature of
    PPC_MEM_KEYS
  powerpc/book3s64/kuap: Move UAMOR setup to key init function
  powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash
    translation
  powerpc/exec: Set thread.regs early during exec
  powerpc/book3s64/pkeys: Store/restore userspace AMR correctly on entry
    and exit from kernel
  powerpc/book3s64/kuep: Store/restore userspace IAMR correctly on entry
    and exit from kernel
  powerpc/book3s64/pkeys: Inherit correctly on fork.
  powerpc/book3s64/pkeys: Reset userspace AMR correctly on exec
  powerpc/ptrace-view: Use pt_regs values instead of thread_struct based
    one.
  powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode.
  powerpc/book3s64/kuap: Restrict access to userspace based on userspace
    AMR
  powerpc/book3s64/kuap: Improve error reporting with KUAP
  powerpc/book3s64/kuap: Use Key 3 to implement KUAP with hash
    translation.
  powerpc/book3s64/kuep: Use Key 3 to implement KUEP with hash
    translation.
  powerpc/book3s64/hash/kuap: Enable kuap on hash
  powerpc/book3s64/hash/kuep: Enable KUEP on hash
  powerpc/book3s64/keys: Print information during boot.

 .../powerpc/include/asm/book3s/64/hash-pkey.h |  24 +-
 arch/powerpc/include/asm/book3s/64/hash.h     |   3 +-
 .../powerpc/include/asm/book3s/64/kup-radix.h | 163 ----------
 arch/powerpc/include/asm/book3s/64/kup.h      | 294 ++++++++++++++++++
 arch/powerpc/include/asm/book3s/64/mmu-hash.h |   1 +
 arch/powerpc/include/asm/book3s/64/pkeys.h    |  11 +-
 arch/powerpc/include/asm/kup.h                |   2 +-
 arch/powerpc/include/asm/mmu.h                |  15 +-
 arch/powerpc/include/asm/pkeys.h              |  24 +-
 arch/powerpc/include/asm/processor.h          |   5 -
 arch/powerpc/include/asm/ptrace.h             |   6 +-
 arch/powerpc/kernel/asm-offsets.c             |   4 +
 arch/powerpc/kernel/entry_64.S                |   4 +-
 arch/powerpc/kernel/process.c                 |  36 ++-
 arch/powerpc/kernel/prom.c                    |   6 +
 arch/powerpc/kernel/ptrace/ptrace-view.c      |  23 +-
 arch/powerpc/kernel/smp.c                     |   3 +
 arch/powerpc/kernel/syscall_64.c              |  28 +-
 arch/powerpc/kernel/traps.c                   |   6 -
 arch/powerpc/mm/book3s64/hash_4k.c            |   2 +-
 arch/powerpc/mm/book3s64/hash_64k.c           |   4 +-
 arch/powerpc/mm/book3s64/hash_hugepage.c      |   2 +-
 arch/powerpc/mm/book3s64/hash_hugetlbpage.c   |   2 +-
 arch/powerpc/mm/book3s64/hash_pgtable.c       |   2 +-
 arch/powerpc/mm/book3s64/hash_utils.c         |  10 +-
 arch/powerpc/mm/book3s64/pkeys.c              | 226 +++++++-------
 arch/powerpc/mm/book3s64/radix_pgtable.c      |  36 ---
 arch/powerpc/mm/fault.c                       |  27 +-
 arch/powerpc/platforms/Kconfig.cputype        |   4 +-
 29 files changed, 586 insertions(+), 387 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/book3s/64/kup-radix.h
 create mode 100644 arch/powerpc/include/asm/book3s/64/kup.h

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2.25.3