• Alexander Potapenko's avatar
    kasan: modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right() · e6e8379c
    Alexander Potapenko authored
    This patchset implements SLAB support for KASAN
    Unlike SLUB, SLAB doesn't store allocation/deallocation stacks for heap
    objects, therefore we reimplement this feature in mm/kasan/stackdepot.c.
    The intention is to ultimately switch SLUB to use this implementation as
    well, which will save a lot of memory (right now SLUB bloats each object
    by 256 bytes to store the allocation/deallocation stacks).
    Also neither SLUB nor SLAB delay the reuse of freed memory chunks, which
    is necessary for better detection of use-after-free errors.  We
    introduce memory quarantine (mm/kasan/quarantine.c), which allows
    delayed reuse of deallocated memory.
    This patch (of 7):
    Rename kmalloc_large_oob_right() to kmalloc_pagealloc_oob_right(), as
    the test only checks the page allocator functionality.  Also reimplement
    kmalloc_large_oob_right() so that the test allocates a large enough
    chunk of memory that still does not trigger the page allocator fallback.
    Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Pekka Enberg <penberg@kernel.org>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Cc: Andrey Konovalov <adech.fo@gmail.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Konstantin Serebryany <kcc@google.com>
    Cc: Dmitry Chernenkov <dmitryc@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
test_kasan.c 6.86 KB