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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-05 23:05:47 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:03:02 -0700 |
| commit | 80b92bfe3bb75aa6688f58af9df356757a46f659 (patch) | |
| tree | 03827a0d4725b1ad461ff9f57e9919f7c0b33ad3 /mm/kasan/kasan.h | |
| parent | 7ebfce33125100e3f0c5e059845a019a1401433d (diff) | |
| download | linux-stable-80b92bfe3bb75aa6688f58af9df356757a46f659.tar.gz linux-stable-80b92bfe3bb75aa6688f58af9df356757a46f659.tar.bz2 linux-stable-80b92bfe3bb75aa6688f58af9df356757a46f659.zip | |
kasan: dynamically allocate stack ring entries
Instead of using a large static array, allocate the stack ring dynamically
via memblock_alloc().
The size of the stack ring is controlled by a new kasan.stack_ring_size
command-line parameter. When kasan.stack_ring_size is not provided, the
default value of 32 << 10 is used.
When the stack trace collection is disabled via kasan.stacktrace=off, the
stack ring is not allocated.
Link: https://lkml.kernel.org/r/03b82ab60db53427e9818e0b0c1971baa10c3cbc.1662411800.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan/kasan.h')
| -rw-r--r-- | mm/kasan/kasan.h | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 447baf1a7a2e..abbcc1b0eec5 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -252,12 +252,11 @@ struct kasan_stack_ring_entry { bool is_free; }; -#define KASAN_STACK_RING_SIZE (32 << 10) - struct kasan_stack_ring { rwlock_t lock; + size_t size; atomic64_t pos; - struct kasan_stack_ring_entry entries[KASAN_STACK_RING_SIZE]; + struct kasan_stack_ring_entry *entries; }; #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ |