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References: <20200924040152.30851-1-walter-zh.wu@mediatek.com> <87h7rfi8pn.fsf@nanos.tec.linutronix.de>
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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Tue, 1 Dec 2020 08:59:59 +0100
Message-ID: <CACT4Y+a=GmYVZwwjyXwO=_AeGy4QB9X=5x7cL76erwjPvRW6Zw@mail.gmail.com>
Subject: Re: [PATCH v4 0/6] kasan: add workqueue and timer stack for generic KASAN
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Walter Wu <walter-zh.wu@mediatek.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        John Stultz <john.stultz@linaro.org>,
        Stephen Boyd <sboyd@kernel.org>, Tejun Heo <tj@kernel.org>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Marco Elver <elver@google.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Linux-MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        wsd_upstream <wsd_upstream@mediatek.com>,
        linux-mediatek@lists.infradead.org
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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.

> > [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 ;)