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kasan: update documentation for generic kasan

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Generic KASAN also supports to record the last two workqueue stacks and
print them in KASAN report.  So that need to update documentation.

Link: https://lkml.kernel.org/r/20201203023037.30792-1-walter-zh.wu@mediatek.com
Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Suggested-by: Marco Elver <elver@google.com>
Acked-by: Marco Elver <elver@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Walter Wu 2020-12-14 19:09:21 -08:00 committed by Linus Torvalds
parent 214c783d59
commit 4784be284a
1 changed files with 3 additions and 2 deletions
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Documentation/dev-tools/kasan.rst
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@ -190,8 +190,9 @@ function calls GCC directly inserts the code to check the shadow memory.
This option significantly enlarges kernel but it gives x1.1-x2 performance This option significantly enlarges kernel but it gives x1.1-x2 performance
boost over outline instrumented kernel. boost over outline instrumented kernel.
Generic KASAN prints up to 2 call_rcu() call stacks in reports, the last one Generic KASAN also reports the last 2 call stacks to creation of work that
and the second to last. potentially has access to an object. Call stacks for the following are shown:
call_rcu() and workqueue queuing.
Software tag-based KASAN Software tag-based KASAN
~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~