diff options
| 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 /Documentation/dev-tools/kasan.rst | |
| parent | 7ebfce33125100e3f0c5e059845a019a1401433d (diff) | |
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 'Documentation/dev-tools/kasan.rst')
| -rw-r--r-- | Documentation/dev-tools/kasan.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index 7bd38c181018..5c93ab915049 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -112,10 +112,12 @@ parameter can be used to control panic and reporting behaviour: if ``kasan_multi_shot`` is enabled. Software and Hardware Tag-Based KASAN modes (see the section about various -modes below) support disabling stack trace collection: +modes below) support altering stack trace collection behavior: - ``kasan.stacktrace=off`` or ``=on`` disables or enables alloc and free stack traces collection (default: ``on``). +- ``kasan.stack_ring_size=<number of entries>`` specifies the number of entries + in the stack ring (default: ``32768``). Hardware Tag-Based KASAN mode is intended for use in production as a security mitigation. Therefore, it supports additional boot parameters that allow |