Building on the work of Christophe, Aneesh and Balbir, I've ported KASAN to 64-bit Book3S kernels running on the Radix MMU.
It builds on top Christophe's work on 32bit. It also builds on my generic KASAN_VMALLOC series, available at: https://patchwork.kernel.org/project/linux-mm/list/?series=153209 This provides full inline instrumentation on radix, but does require that you be able to specify the amount of memory on the system at compile time. More details in patch 4. Notable changes from the RFC: - I've dropped Book3E 64-bit for now. - Now instead of hacking into the KASAN core to disable module allocations, we use KASAN_VMALLOC. - More testing, including on real hardware. This revealed that discontiguous memory is a bit of a headache, at the moment we must disable memory not contiguous from 0. - Update to deal with kasan bitops instrumentation that landed between RFC and now. - Documentation! - Various cleanups and tweaks. I am getting occasional problems on boot of real hardware where it seems vmalloc space mappings don't get installed in time. (We get a BUG that memory is not accessible, but by the time we hit xmon the memory then is accessible!) It happens once every few boots. I haven't yet been able to figure out what is happening and why. I'm going to look in to it, but I think the patches are in good enough shape to review while I work on it. Regards, Daniel Daniel Axtens (4): kasan: allow arches to provide their own early shadow setup kasan: support instrumented bitops with generic non-atomic bitops powerpc: support KASAN instrumentation of bitops powerpc: Book3S 64-bit "heavyweight" KASAN support Documentation/dev-tools/kasan.rst | 7 +- Documentation/powerpc/kasan.txt | 111 ++++++++++++++ arch/powerpc/Kconfig | 4 + arch/powerpc/Kconfig.debug | 21 +++ arch/powerpc/Makefile | 7 + arch/powerpc/include/asm/bitops.h | 25 ++-- arch/powerpc/include/asm/book3s/64/radix.h | 5 + arch/powerpc/include/asm/kasan.h | 35 ++++- arch/powerpc/kernel/process.c | 8 ++ arch/powerpc/kernel/prom.c | 57 +++++++- arch/powerpc/mm/kasan/Makefile | 1 + arch/powerpc/mm/kasan/kasan_init_book3s_64.c | 76 ++++++++++ include/asm-generic/bitops-instrumented.h | 144 ++++++++++--------- include/linux/kasan.h | 2 + lib/Kconfig.kasan | 3 + mm/kasan/init.c | 10 ++ 16 files changed, 431 insertions(+), 85 deletions(-) create mode 100644 Documentation/powerpc/kasan.txt create mode 100644 arch/powerpc/mm/kasan/kasan_init_book3s_64.c -- 2.20.1
