On 08/17/2015 09:36 AM, Aneesh Kumar K.V wrote: > We use the region with region ID 0xe as the kasan shadow region. Since > we use hash page table, we can't have the early zero page based shadow > region support. Hence we disable kasan in the early code and runtime > enable this. We could imporve the condition using static keys. (but > that is for a later patch). We also can't support inline instrumentation > because our kernel mapping doesn't give us a large enough free window > to map the entire range. For VMALLOC and VMEMMAP region we just > return a zero page instead of having a translation bolted into the > htab. This simplifies handling VMALLOC and VMEMAP area. Kasan is not > tracking both the region as of now > > Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> > --- > arch/powerpc/include/asm/kasan.h | 74 > ++++++++++++++++++++++++++++++++ > 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 | 1 + > 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 | 3 ++ > arch/powerpc/mm/kasan_init.c | 44 +++++++++++++++++++ > arch/powerpc/mm/slb_low.S | 4 ++ > arch/powerpc/platforms/Kconfig.cputype | 1 + > 14 files changed, 171 insertions(+), 4 deletions(-) > create mode 100644 arch/powerpc/include/asm/kasan.h > create mode 100644 arch/powerpc/mm/kasan_init.c >
Did you disable stack instrumentation (in scripts/Makefile.kasa), or you version of gcc doesn't support it (e.g. like 4.9.x on x86) ? Because this can't work with stack instrumentation as you don't have shadow for stack in early code. But this should be doable, as I think. All you need is to setup shadow for init task's stack before executing any instrumented function. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
