On Mon, 2015-08-17 at 12:06 +0530, Aneesh Kumar K.V wrote: > Hi, > > This patchset implements kernel address sanitizer for ppc64. > Since ppc64 virtual address range is divided into different regions, > we can't have one contigous area for the kasan shadow range. Hence > we don't support the INLINE kasan instrumentation. With Outline > instrumentation, we override the shadow_to_mem and mem_to_shadow > callbacks, so that we map only the kernel linear range (ie, > region with ID 0xc). For region with ID 0xd and 0xf (vmalloc > and vmemmap ) we return the address of the zero page. This > works because kasan doesn't track both vmemmap and vmalloc address. So bear with me, I don't know anything about KASAN, but if you want a shadow, can't you just add a fixed offset to the address and thus effectively shadow each region independently while keeping the inline helpers ?
Cheers, Ben. > Aneesh Kumar K.V (8): > powerpc/mm: Add virt_to_pfn and use this instead of opencoding > kasan: MODULE_VADDR is not available on all archs > kasan: Rename kasan_enabled to kasan_report_enabled > kasan: Don't use kasan shadow pointer in generic functions > kasan: Enable arch to hook into kasan callbacks. > kasan: Allow arch to overrride kasan shadow offsets > powerpc/mm: kasan: Add kasan support for ppc64 > powerpc: Disable kasan for kernel/ and mm/ directory > > -aneesh > > arch/powerpc/include/asm/kasan.h | 74 > ++++++++++++++++++++++++++++++++ > arch/powerpc/include/asm/page.h | 5 ++- > arch/powerpc/include/asm/pgtable-ppc64.h | 1 + > arch/powerpc/include/asm/ppc_asm.h | 10 +++++ > arch/powerpc/include/asm/string.h | 13 ++++++ > arch/powerpc/kernel/Makefile | 2 + > arch/powerpc/kernel/prom_init_check.sh | 2 +- > arch/powerpc/kernel/setup_64.c | 3 ++ > arch/powerpc/lib/mem_64.S | 6 ++- > arch/powerpc/lib/memcpy_64.S | 3 +- > arch/powerpc/lib/ppc_ksyms.c | 10 +++++ > arch/powerpc/mm/Makefile | 4 ++ > arch/powerpc/mm/kasan_init.c | 44 +++++++++++++++++++ > arch/powerpc/mm/slb_low.S | 4 ++ > arch/powerpc/platforms/Kconfig.cputype | 1 + > include/linux/kasan.h | 3 ++ > mm/kasan/kasan.c | 9 ++++ > mm/kasan/kasan.h | 20 ++++++++- > mm/kasan/report.c | 19 ++++---- > 19 files changed, 216 insertions(+), 17 deletions(-) > create mode 100644 arch/powerpc/include/asm/kasan.h > create mode 100644 arch/powerpc/mm/kasan_init.c > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
