• Alexander Popov's avatar
    x86/kasan: Fix KASAN shadow region page tables · 5d5aa3cf
    Alexander Popov authored
    Currently KASAN shadow region page tables created without
    respect of physical offset (phys_base). This causes kernel halt
    when phys_base is not zero.
    
    So let's initialize KASAN shadow region page tables in
    kasan_early_init() using __pa_nodebug() which considers
    phys_base.
    
    This patch also separates x86_64_start_kernel() from KASAN low
    level details by moving kasan_map_early_shadow(init_level4_pgt)
    into kasan_early_init().
    
    Remove the comment before clear_bss() which stopped bringing
    much profit to the code readability. Otherwise describing all
    the new order dependencies would be too verbose.
    Signed-off-by: default avatarAlexander Popov <alpopov@ptsecurity.com>
    Signed-off-by: default avatarAndrey Ryabinin <a.ryabinin@samsung.com>
    Cc: <stable@vger.kernel.org> # 4.0+
    Cc: Alexander Potapenko <glider@google.com>
    Cc: Andrey Konovalov <adech.fo@gmail.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1435828178-10975-3-git-send-email-a.ryabinin@samsung.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    5d5aa3cf
head_64.S 13 KB