[v8,0/4] KASAN for powerpc64 radix

Message

Daniel Axtens July 2, 2020, 2:54 a.m. UTC

Building on the work of Christophe, Aneesh and Balbir, I've ported
KASAN to 64-bit Book3S kernels running on the Radix MMU.

This provides full inline instrumentation on radix, but does require
that you be able to specify the amount of physically contiguous memory
on the system at compile time. More details in patch 4.

v8 is just a rebase of v7 on a more recent powerpc/merge and a fixup
of a whitespace error.

Module globals still don't work, but that's due to some 'clever'
renaming of a section that the powerpc module loading code does to
avoid more complicated relocations/tramplines rather than anything to
do with KASAN.

Daniel Axtens (4):
  kasan: define and use MAX_PTRS_PER_* for early shadow tables
  kasan: Document support on 32-bit powerpc
  powerpc/mm/kasan: rename kasan_init_32.c to init_32.c
  powerpc: Book3S 64-bit "heavyweight" KASAN support

 Documentation/dev-tools/kasan.rst             |   8 +-
 Documentation/powerpc/kasan.txt               | 122 ++++++++++++++++++
 arch/powerpc/Kconfig                          |   3 +-
 arch/powerpc/Kconfig.debug                    |  23 +++-
 arch/powerpc/Makefile                         |  11 ++
 arch/powerpc/include/asm/book3s/64/hash.h     |   4 +
 arch/powerpc/include/asm/book3s/64/pgtable.h  |   7 +
 arch/powerpc/include/asm/book3s/64/radix.h    |   5 +
 arch/powerpc/include/asm/kasan.h              |  11 +-
 arch/powerpc/kernel/Makefile                  |   2 +
 arch/powerpc/kernel/process.c                 |  16 ++-
 arch/powerpc/kernel/prom.c                    |  76 ++++++++++-
 arch/powerpc/mm/kasan/Makefile                |   3 +-
 .../mm/kasan/{kasan_init_32.c => init_32.c}   |   0
 arch/powerpc/mm/kasan/init_book3s_64.c        |  73 +++++++++++
 arch/powerpc/mm/ptdump/ptdump.c               |  10 +-
 arch/powerpc/platforms/Kconfig.cputype        |   1 +
 include/linux/kasan.h                         |  18 ++-
 mm/kasan/init.c                               |   6 +-
 19 files changed, 377 insertions(+), 22 deletions(-)
 create mode 100644 Documentation/powerpc/kasan.txt
 rename arch/powerpc/mm/kasan/{kasan_init_32.c => init_32.c} (100%)
 create mode 100644 arch/powerpc/mm/kasan/init_book3s_64.c