• Andrey Ryabinin's avatar
    x86_64: add KASan support · ef7f0d6a
    Andrey Ryabinin authored
    This patch adds arch specific code for kernel address sanitizer.
    16TB of virtual addressed used for shadow memory.  It's located in range
    [ffffec0000000000 - fffffc0000000000] between vmemmap and %esp fixup
    At early stage we map whole shadow region with zero page.  Latter, after
    pages mapped to direct mapping address range we unmap zero pages from
    corresponding shadow (see kasan_map_shadow()) and allocate and map a real
    shadow memory reusing vmemmap_populate() function.
    Also replace __pa with __pa_nodebug before shadow initialized.  __pa with
    CONFIG_DEBUG_VIRTUAL=y make external function call (__phys_addr)
    __phys_addr is instrumented, so __asan_load could be called before shadow
    area initialized.
    Signed-off-by: default avatarAndrey Ryabinin <a.ryabinin@samsung.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: Konstantin Serebryany <kcc@google.com>
    Cc: Dmitry Chernenkov <dmitryc@google.com>
    Signed-off-by: default avatarAndrey Konovalov <adech.fo@gmail.com>
    Cc: Yuri Gribov <tetra2005@gmail.com>
    Cc: Konstantin Khlebnikov <koct9i@gmail.com>
    Cc: Sasha Levin <sasha.levin@oracle.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Pekka Enberg <penberg@kernel.org>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Jim Davis <jim.epost@gmail.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
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