Messages in this thread | | | Subject | Re: [PATCH v4 0/6] kasan: add workqueue and timer stack for generic KASAN | From | Walter Wu <> | Date | Tue, 1 Dec 2020 19:17:02 +0800 |
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Hi Dmitry,
On Tue, 2020-12-01 at 08:59 +0100, 'Dmitry Vyukov' via kasan-dev wrote: > On Wed, Sep 30, 2020 at 5:29 PM Thomas Gleixner <tglx@linutronix.de> wrote: > > > > On Thu, Sep 24 2020 at 12:01, Walter Wu wrote: > > > Syzbot reports many UAF issues for workqueue or timer, see [1] and [2]. > > > 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 on workqueue. The same may stand for times. > > > > > > This patchset improves KASAN reports by making them to have workqueue > > > queueing stack and timer stack information. It is useful for programmers > > > to solve use-after-free or double-free memory issue. > > > > > > Generic KASAN also records the last two workqueue and timer stacks and > > > prints them in KASAN report. It is only suitable for generic KASAN. > > Walter, did you mail v5? > Checking statuses of KASAN issues and this seems to be not in linux-next. >
Sorry for the delay in responding to this patch. I'm busy these few months, so that suspend processing it. Yes, I will send it next week. But v4 need to confirm the timer stack is useful. I haven't found an example. Do you have some suggestion about timer?
Thanks. Walter
> > > [1]https://groups.google.com/g/syzkaller-bugs/search?q=%22use-after-free%22+process_one_work > > > [2]https://groups.google.com/g/syzkaller-bugs/search?q=%22use-after-free%22%20expire_timers > > > > How are these links useful for people who do not have a gurgle account? > > This is a public mailing list archive, so effectively the same way as > lore links ;) >
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