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From: Dmitry Vyukov <dvyukov@google.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Aleksandr Nogikh <a.nogikh@gmail.com>,
	David Miller <davem@davemloft.net>,
	Johannes Berg <johannes@sipsolutions.net>,
	Eric Dumazet <edumazet@google.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Marco Elver <elver@google.com>,
	LKML <linux-kernel@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	Aleksandr Nogikh <nogikh@google.com>
Subject: Re: [PATCH 1/2] net: store KCOV remote handle in sk_buff
Date: Sat, 10 Oct 2020 09:54:57 +0200	[thread overview]
Message-ID: <CACT4Y+ZF_umjBpyJiCb8YPQOOSofG-M9h0CB=xn3bCgK=Kr=9w@mail.gmail.com> (raw)
In-Reply-To: <20201009161558.57792e1a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>

On Sat, Oct 10, 2020 at 1:16 AM Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Wed,  7 Oct 2020 10:17:25 +0000 Aleksandr Nogikh wrote:
> > From: Aleksandr Nogikh <nogikh@google.com>
> >
> > Remote KCOV coverage collection enables coverage-guided fuzzing of the
> > code that is not reachable during normal system call execution. It is
> > especially helpful for fuzzing networking subsystems, where it is
> > common to perform packet handling in separate work queues even for the
> > packets that originated directly from the user space.
> >
> > Enable coverage-guided frame injection by adding a kcov_handle
> > parameter to sk_buff structure. Initialization in __alloc_skb ensures
> > that no socket buffer that was generated during a system call will be
> > missed.
> >
> > Code that is of interest and that performs packet processing should be
> > annotated with kcov_remote_start()/kcov_remote_stop().
> >
> > An alternative approach is to determine kcov_handle solely on the
> > basis of the device/interface that received the specific socket
> > buffer. However, in this case it would be impossible to distinguish
> > between packets that originated from normal background network
> > processes and those that were intentionally injected from the user
> > space.
> >
> > Signed-off-by: Aleksandr Nogikh <nogikh@google.com>
>
> Could you use skb_extensions for this?

Why? If for space, this is already under a non-production ifdef.

  reply	other threads:[~2020-10-10  7:56 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07 10:17 [PATCH 0/2] net, mac80211: enable KCOV remote coverage collection for 802.11 frame handling Aleksandr Nogikh
2020-10-07 10:17 ` [PATCH 1/2] net: store KCOV remote handle in sk_buff Aleksandr Nogikh
2020-10-09 23:15   ` Jakub Kicinski
2020-10-10  7:54     ` Dmitry Vyukov [this message]
2020-10-10 15:14       ` Jakub Kicinski
2020-10-12  6:04         ` Dmitry Vyukov
2020-10-13 15:59           ` Aleksandr Nogikh
2020-10-13 16:50             ` Jakub Kicinski
2020-10-15 19:04               ` Willem de Bruijn
2020-10-16 14:20                 ` Aleksandr Nogikh
2020-10-12  7:12   ` Johannes Berg
2020-10-12 10:10     ` Aleksandr Nogikh
2020-10-07 10:17 ` [PATCH 2/2] mac80211: add KCOV remote annotations to incoming frame processing Aleksandr Nogikh
2020-10-07 11:48 ` [PATCH 0/2] net, mac80211: enable KCOV remote coverage collection for 802.11 frame handling Johannes Berg
2020-10-07 14:40   ` Aleksandr Nogikh

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