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A mirror of the official Linux kernel repository just in case
e89a85d63f
Patch series "kasan: add workqueue stack for generic KASAN", v5. Syzbot reports many UAF issues for workqueue, see [1]. In some of these access/allocation happened in process_one_work(), we see the free stack is useless in KASAN report, it doesn't help programmers to solve UAF for workqueue issue. This patchset improves KASAN reports by making them to have workqueue queueing stack. It is useful for programmers to solve use-after-free or double-free memory issue. Generic KASAN also records the last two workqueue stacks and prints them in KASAN report. It is only suitable for generic KASAN. [1] https://groups.google.com/g/syzkaller-bugs/search?q=%22use-after-free%22+process_one_work [2] https://bugzilla.kernel.org/show_bug.cgi?id=198437 This patch (of 4): When analyzing use-after-free or double-free issue, recording the enqueuing work stacks is helpful to preserve usage history which potentially gives a hint about the affected code. For workqueue it has turned out to be useful to record the enqueuing work call stacks. Because user can see KASAN report to determine whether it is root cause. They don't need to enable debugobjects, but they have a chance to find out the root cause. Link: https://lkml.kernel.org/r/20201203022148.29754-1-walter-zh.wu@mediatek.com Link: https://lkml.kernel.org/r/20201203022442.30006-1-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> Acked-by: Tejun Heo <tj@kernel.org> 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: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Marco Elver <elver@google.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.