Hi Abbott, On 03/18/2018 05:53 AM, Abbott Liu wrote: > Changelog: > v2 - v1 > - Fixed some compiling error which happens on changing kernel compression > mode to lzma/xz/lzo/lz4. > ---Reported by: Florian Fainelli <f.fainelli@xxxxxxxxx>, > Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx> > - Fixed a compiling error cause by some older arm instruction set(armv4t) > don't suppory movw/movt which is reported by kbuild. > - Changed the pte flag from _L_PTE_DEFAULT | L_PTE_DIRTY | L_PTE_XN to > pgprot_val(PAGE_KERNEL). > ---Reported by: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx> > - Moved Enable KASan patch as the last one. > ---Reported by: Florian Fainelli <f.fainelli@xxxxxxxxx>, > Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx> > - Moved the definitions of cp15 registers from > arch/arm/include/asm/kvm_hyp.h to arch/arm/include/asm/cp15.h. > ---Asked by: Mark Rutland <mark.rutland@xxxxxxx> > - Merge the following commits into the commit > Define the virtual space of KASan's shadow region: > 1) Define the virtual space of KASan's shadow region; > 2) Avoid cleaning the KASan shadow area's mapping table; > 3) Add KASan layout; > - Merge the following commits into the commit > Initialize the mapping of KASan shadow memory: > 1) Initialize the mapping of KASan shadow memory; > 2) Add support arm LPAE; > 3) Don't need to map the shadow of KASan's shadow memory; > ---Reported by: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx> > 4) Change mapping of kasan_zero_page int readonly. Thanks for posting these patches! Just FWIW, you cannot quite add someone's Tested-by for a patch series that was just resubmitted given the differences with v1. I just gave it a spin on a Cortex-A5 (no LPAE) and it looks like test_kasan.ko is passing, great job! > > Hi,all: > These patches add arch specific code for kernel address sanitizer > (see Documentation/kasan.txt). > > 1/8 of kernel addresses reserved for shadow memory. There was no > big enough hole for this, so virtual addresses for shadow were > stolen from user space. > > At early boot stage the whole shadow region populated with just > one physical page (kasan_zero_page). Later, this page reused > as readonly zero shadow for some memory that KASan currently > don't track (vmalloc). > > After mapping the physical memory, pages for shadow memory are > allocated and mapped. > > KASan's stack instrumentation significantly increases stack's > consumption, so CONFIG_KASAN doubles THREAD_SIZE. > > Functions like memset/memmove/memcpy do a lot of memory accesses. > If bad pointer passed to one of these function it is important > to catch this. Compiler's instrumentation cannot do this since > these functions are written in assembly. > > KASan replaces memory functions with manually instrumented variants. > Original functions declared as weak symbols so strong definitions > in mm/kasan/kasan.c could replace them. Original functions have aliases > with '__' prefix in name, so we could call non-instrumented variant > if needed. > > Some files built without kasan instrumentation (e.g. mm/slub.c). > Original mem* function replaced (via #define) with prefixed variants > to disable memory access checks for such files. > > On arm LPAE architecture, the mapping table of KASan shadow memory(if > PAGE_OFFSET is 0xc0000000, the KASan shadow memory's virtual space is > 0xb6e000000~0xbf000000) can't be filled in do_translation_fault function, > because kasan instrumentation maybe cause do_translation_fault function > accessing KASan shadow memory. The accessing of KASan shadow memory in > do_translation_fault function maybe cause dead circle. So the mapping table > of KASan shadow memory need be copyed in pgd_alloc function. > > > Most of the code comes from: > https://github.com/aryabinin/linux/commit/0b54f17e70ff50a902c4af05bb92716eb95acefe > > These patches are tested on vexpress-ca15, vexpress-ca9 > > > > Cc: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> > Tested-by: Abbott Liu <liuwenliang@xxxxxxxxxx> > Signed-off-by: Abbott Liu <liuwenliang@xxxxxxxxxx> > > Abbott Liu (3): > 2 1-byte checks more safer for memory_is_poisoned_16 > Add TTBR operator for kasan_init > Define the virtual space of KASan's shadow region > > Andrey Ryabinin (4): > Disable instrumentation for some code > Replace memory function for kasan > Initialize the mapping of KASan shadow memory > Enable KASan for arm > > arch/arm/Kconfig | 1 + > arch/arm/boot/compressed/Makefile | 1 + > arch/arm/boot/compressed/decompress.c | 2 + > arch/arm/boot/compressed/libfdt_env.h | 2 + > arch/arm/include/asm/cp15.h | 104 ++++++++++++ > arch/arm/include/asm/kasan.h | 23 +++ > arch/arm/include/asm/kasan_def.h | 52 ++++++ > arch/arm/include/asm/kvm_hyp.h | 52 ------ > arch/arm/include/asm/memory.h | 5 + > arch/arm/include/asm/pgalloc.h | 7 +- > arch/arm/include/asm/string.h | 17 ++ > arch/arm/include/asm/thread_info.h | 4 + > arch/arm/kernel/entry-armv.S | 5 +- > arch/arm/kernel/entry-common.S | 6 +- > arch/arm/kernel/head-common.S | 7 +- > arch/arm/kernel/setup.c | 2 + > arch/arm/kernel/unwind.c | 3 +- > arch/arm/kvm/hyp/cp15-sr.c | 12 +- > arch/arm/kvm/hyp/switch.c | 6 +- > arch/arm/lib/memcpy.S | 3 + > arch/arm/lib/memmove.S | 5 +- > arch/arm/lib/memset.S | 3 + > arch/arm/mm/Makefile | 3 + > arch/arm/mm/init.c | 6 + > arch/arm/mm/kasan_init.c | 290 ++++++++++++++++++++++++++++++++++ > arch/arm/mm/mmu.c | 7 +- > arch/arm/mm/pgd.c | 14 ++ > arch/arm/vdso/Makefile | 2 + > mm/kasan/kasan.c | 24 ++- > 29 files changed, 588 insertions(+), 80 deletions(-) > create mode 100644 arch/arm/include/asm/kasan.h > create mode 100644 arch/arm/include/asm/kasan_def.h > create mode 100644 arch/arm/mm/kasan_init.c > -- Florian
