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authorDmitry Vyukov <dvyukov@google.com>2016-10-28 02:46:44 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-28 03:43:43 +0200
commit02754e0a484a50a92d44c38879f2cb2792ebc572 (patch)
tree0ad938a86ba3f2b53448a41d4d2adbacf750f80a /lib/locking-selftest.c
parentlatent_entropy: raise CONFIG_FRAME_WARN by default (diff)
downloadlinux-02754e0a484a50a92d44c38879f2cb2792ebc572.tar.xz
linux-02754e0a484a50a92d44c38879f2cb2792ebc572.zip
lib/stackdepot.c: bump stackdepot capacity from 16MB to 128MB
KASAN uses stackdepot to memorize stacks for all kmalloc/kfree calls. Current stackdepot capacity is 16MB (1024 top level entries x 4 pages on second level). Size of each stack is (num_frames + 3) * sizeof(long). Which gives us ~84K stacks. This capacity was chosen empirically and it is enough to run kernel normally. However, when lots of configs are enabled and a fuzzer tries to maximize code coverage, it easily hits the limit within tens of minutes. I've tested for long a time with number of top level entries bumped 4x (4096). And I think I've seen overflow only once. But I don't have all configs enabled and code coverage has not reached maximum yet. So bump it 8x to 8192. Since we have two-level table, memory cost of this is very moderate -- currently the top-level table is 8KB, with this patch it is 64KB, which is negligible under KASAN. Here is some approx math. 128MB allows us to memorize ~670K stacks (assuming stack is ~200b). I've grepped kernel for kmalloc|kfree|kmem_cache_alloc|kmem_cache_free| kzalloc|kstrdup|kstrndup|kmemdup and it gives ~60K matches. Most of alloc/free call sites are reachable with only one stack. But some utility functions can have large fanout. Assuming average fanout is 5x, total number of alloc/free stacks is ~300K. Link: http://lkml.kernel.org/r/1476458416-122131-1-git-send-email-dvyukov@google.com Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Baozeng Ding <sploving1@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/locking-selftest.c')
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