netdev - Re: [PATCH v3 net-next 00/23] net: add preliminary netdev refcount tracking

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20211206162640.6a6bfbac@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 6 Dec 2021 16:26:40 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v3 net-next 00/23] net: add preliminary netdev refcount
 tracking

On Sat,  4 Dec 2021 20:21:54 -0800 Eric Dumazet wrote:
> Two first patches add a generic infrastructure, that will be used
> to get tracking of refcount increments/decrements.
> 
> The general idea is to be able to precisely pair each decrement with
> a corresponding prior increment. Both share a cookie, basically
> a pointer to private data storing stack traces.
> 
> The third patch adds dev_hold_track() and dev_put_track() helpers
> (CONFIG_NET_DEV_REFCNT_TRACKER)
> 
> Then a series of 20 patches converts some dev_hold()/dev_put()
> pairs to new hepers : dev_hold_track() and dev_put_track().
> 
> Hopefully this will be used by developpers and syzbot to
> root cause bugs that cause netdevice dismantles freezes.
> 
> With CONFIG_PCPU_DEV_REFCNT=n option, we were able to detect
> some class of bugs, but too late (when too many dev_put()
> were happening).

Applied with minor fixes to patches 3 and 20. Thanks!