[PATCH v2 0/4] KASAN for powerpc64 radix, plus generic mm change

Daniel Axtens
2019-12-10T04:47:23Z

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.

The big change from v1 is the introduction of tree-wide(ish)
MAX_PTRS_PER_{PTE,PMD,PUD} macros in preference to the previous
approach, which was for the arch to override the page table array
definitions with their own. (And I squashed the annoying intermittent
crash!)

Apart from that there's just a lot of cleanup. Christophe, I've
addressed most of what you asked for and I will reply to your v1
emails to clarify what remains unchanged.

Regards,
Daniel

Daniel Axtens (4):
mm: define MAX_PTRS_PER_{PTE,PMD,PUD}
kasan: use MAX_PTRS_PER_* for early shadow
kasan: Document support on 32-bit powerpc
powerpc: Book3S 64-bit "heavyweight" KASAN support

Documentation/dev-tools/kasan.rst | 7 +-
Documentation/powerpc/kasan.txt | 112 ++++++++++++++++++
arch/arm64/include/asm/pgtable-hwdef.h | 3 +
arch/powerpc/Kconfig | 3 +
arch/powerpc/Kconfig.debug | 21 ++++
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 | 20 +++-
arch/powerpc/kernel/process.c | 8 ++
arch/powerpc/kernel/prom.c | 59 ++++++++-
arch/powerpc/mm/kasan/Makefile | 3 +-
.../mm/kasan/{kasan_init_32.c => init_32.c} | 0
arch/powerpc/mm/kasan/init_book3s_64.c | 67 +++++++++++
arch/s390/include/asm/pgtable.h | 3 +
arch/x86/include/asm/pgtable_types.h | 5 +
arch/xtensa/include/asm/pgtable.h | 1 +
include/asm-generic/pgtable-nop4d-hack.h | 9 +-
include/asm-generic/pgtable-nopmd.h | 9 +-
include/asm-generic/pgtable-nopud.h | 9 +-
include/linux/kasan.h | 6 +-
mm/kasan/init.c | 6 +-
23 files changed, 353 insertions(+), 25 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

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2.20.1