linux-kernel - Re: [PATCH v2 0/3] [PATCH v2 0/3] [PATCH v2 0/3] net, mac80211, kernel: enable KCOV remote coverage collection for 802.11 frame handling

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Date:   Sun, 11 Oct 2020 20:53:35 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Johannes Berg <johannes@...solutions.net>,
        Aleksandr Nogikh <a.nogikh@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>, kuba@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Marco Elver <elver@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, linux-wireless@...r.kernel.org,
        Aleksandr Nogikh <nogikh@...gle.com>
Subject: Re: [PATCH v2 0/3] [PATCH v2 0/3] [PATCH v2 0/3] net, mac80211,
 kernel: enable KCOV remote coverage collection for 802.11 frame handling

On Sun, Oct 11, 2020 at 8:50 PM Johannes Berg <johannes@...solutions.net> wrote:
>
> On Fri, 2020-10-09 at 17:01 +0000, Aleksandr Nogikh wrote:
> > From: Aleksandr Nogikh <nogikh@...gle.com>
> >
> > This patch series enables remote KCOV coverage collection during
> > 802.11 frames processing. These changes make it possible to perform
> > coverage-guided fuzzing in search of remotely triggerable bugs.
>
> Btw, it occurred to me that I don't know at all - is this related to
> syzkaller? Or is there some other fuzzing you're working on? Can we get
> the bug reports from it if it's different? :)

Yes, all this is for syzkaller :)

>
> Also, unrelated to that (but I see Dmitry CC'ed), I started wondering if
> it'd be helpful to have an easier raw 802.11 inject path on top of say
> hwsim0; I noticed some syzbot reports where it created raw sockets, but
> that only gets you into the *data* plane of the wifi stack, not into the
> *management* plane. Theoretically you could add a monitor interface, but
> right now the wifi setup (according to the current docs on github) is
> using two IBSS interfaces.
>
> Perhaps an inject path on the mac80211-hwsim "hwsim0" interface would be
> something to consider? Or simply adding a third radio that's in
> "monitor" mode, so that a raw socket bound to *that* interface can
> inject with a radiotap header followed by an 802.11 frame, getting to
> arbitrary frame handling code, not just data frames.

I'll let Aleksandr address this part.