• Andrey Ryabinin's avatar
    x86/kasan: Use the same shadow offset for 4- and 5-level paging · 12a8cc7f
    Andrey Ryabinin authored
    We are going to support boot-time switching between 4- and 5-level
    paging. For KASAN it means we cannot have different KASAN_SHADOW_OFFSET
    for different paging modes: the constant is passed to gcc to generate
    code and cannot be changed at runtime.
    
    This patch changes KASAN code to use 0xdffffc0000000000 as shadow offset
    for both 4- and 5-level paging.
    
    For 5-level paging it means that shadow memory region is not aligned to
    PGD boundary anymore and we have to handle unaligned parts of the region
    properly.
    
    In addition, we have to exclude paravirt code from KASAN instrumentation
    as we now use set_pgd() before KASAN is fully ready.
    
    [kirill.shutemov@linux.intel.com: clenaup, changelog message]
    Signed-off-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
    Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: Cyrill Gorcunov <gorcunov@openvz.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-mm@kvack.org
    Link: http://lkml.kernel.org/r/20170929140821.37654-4-kirill.shutemov@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    12a8cc7f
mm.txt 3.56 KB