[GIT PULL] KASan for Arm, v12

[Linus Walleij]

Hi Russell,

please consider pulling in these changes to bring KASan
support to Arm.

Certainly there will be bugs like with all new code, but I
think we are in such good shape that in-tree development
is the best way to go from now so that interested people
can test this out.

I have tested it extensively on classic MMUs from ARMv4
to ARMv7 and also on LPAE. But now I need the help of
linux-next and the broader community to iron out any
remaining corner cases.

I will of course respect a "no" but then some direction would
be sweet. I could for example ask linux-next to include
this branch separately from v5.9-rc1 or so to get some
coverage.

Thanks!
Linus Walleij

The following changes since commit b3a9e3b9622ae10064826dccb4f7a52bd88c7407:

  Linux 5.8-rc1 (2020-06-14 12:45:04 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git
tags/kasan-for-rmk

for you to fetch changes up to 5ebcc6d74e3b7791e3b1c3411a62d216fc5c5230:

  ARM: Enable KASan for ARM (2020-07-20 11:29:31 +0200)

----------------------------------------------------------------
KASan support for ARM, the v12 patch series.

----------------------------------------------------------------
Abbott Liu (1):
      ARM: Define the virtual space of KASan's shadow region

Andrey Ryabinin (3):
      ARM: Disable KASan instrumentation for some code
      ARM: Replace string mem* functions for KASan
      ARM: Enable KASan for ARM

Linus Walleij (1):
      ARM: Initialize the mapping of KASan shadow memory

 Documentation/arm/memory.rst                       |   5 +
 Documentation/dev-tools/kasan.rst                  |   4 +-
 .../features/debug/KASAN/arch-support.txt          |   2 +-
 arch/arm/Kconfig                                   |  10 +
 arch/arm/boot/compressed/Makefile                  |   1 +
 arch/arm/boot/compressed/string.c                  |  19 ++
 arch/arm/include/asm/kasan.h                       |  32 +++
 arch/arm/include/asm/kasan_def.h                   |  81 +++++++
 arch/arm/include/asm/memory.h                      |   5 +
 arch/arm/include/asm/pgalloc.h                     |   8 +-
 arch/arm/include/asm/string.h                      |  21 ++
 arch/arm/include/asm/thread_info.h                 |   8 +
 arch/arm/include/asm/uaccess-asm.h                 |   2 +-
 arch/arm/kernel/entry-armv.S                       |   3 +-
 arch/arm/kernel/entry-common.S                     |   9 +-
 arch/arm/kernel/head-common.S                      |   7 +-
 arch/arm/kernel/setup.c                            |   2 +
 arch/arm/kernel/unwind.c                           |   6 +-
 arch/arm/lib/memcpy.S                              |   3 +
 arch/arm/lib/memmove.S                             |   5 +-
 arch/arm/lib/memset.S                              |   3 +
 arch/arm/mm/Makefile                               |   5 +
 arch/arm/mm/kasan_init.c                           | 264 +++++++++++++++++++++
 arch/arm/mm/mmu.c                                  |  18 ++
 arch/arm/mm/pgd.c                                  |  16 +-
 arch/arm/vdso/Makefile                             |   2 +
 26 files changed, 527 insertions(+), 14 deletions(-)
 create mode 100644 arch/arm/include/asm/kasan.h
 create mode 100644 arch/arm/include/asm/kasan_def.h
 create mode 100644 arch/arm/mm/kasan_init.c