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  • Andrey Ryabinin's avatar
    kernel: add support for .init_array.* constructors · 9ddf8252
    Andrey Ryabinin authored
    
    
    KASan uses constructors for initializing redzones for global variables.
    Globals instrumentation in GCC 4.9.2 produces constructors with priority
    (.init_array.00099)
    
    Currently kernel ignores such constructors.  Only constructors with
    default priority supported (.init_array)
    
    This patch adds support for constructors with priorities.  For kernel
    image we put pointers to constructors between __ctors_start/__ctors_end
    and do_ctors() will call them on start up.  For modules we merge
    .init_array.* sections into resulting .init_array.  Module code properly
    handles constructors in .init_array section.
    
    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>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    9ddf8252