netdev - Re: [PATCH net-next 2/6] software node: allow named software node to be created

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: <20220715204841.pwhvnue2atrkc2fx@skbuf>
Date:   Fri, 15 Jul 2022 23:48:41 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alvin __ipraga <alsi@...g-olufsen.dk>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Daniel Scally <djrscally@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        DENG Qingfang <dqfext@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        George McCollister <george.mccollister@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Sean Wang <sean.wang@...iatek.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Marek Behún <kabel@...nel.org>
Subject: Re: [PATCH net-next 2/6] software node: allow named software node to
 be created

On Fri, Jul 15, 2022 at 11:33:40PM +0300, Andy Shevchenko wrote:
> On Fri, Jul 15, 2022 at 11:17:15PM +0300, Vladimir Oltean wrote:
> > On Fri, Jul 15, 2022 at 10:57:55PM +0300, Andy Shevchenko wrote:
> > > On Fri, Jul 15, 2022 at 05:01:32PM +0100, Russell King wrote:
> > > > From: Vladimir Oltean <vladimir.oltean@....com>
> > > > 
> > > > Allow a named software node to be created, which is needed for software
> > > > nodes for a fixed-link specification for DSA.
> > > 
> > > In general I have no objection, but what's worrying me is a possibility to
> > > collide in namespace. With the current code the name is generated based on
> > > unique IDs, how can we make this one more robust?
> > 
> > Could you be more clear about the exact concern?
> 
> Each software node can be created with a name. The hierarchy should be unique,
> means that there can't be two or more nodes with the same path (like on file
> system or more specifically here, Device Tree). Allowing to pass names we may
> end up with the situation when it will be a path collision. Yet, the static
> names are easier to check, because one may run `git grep ...` or coccinelle
> script to see what's in the kernel.

So won't kobject_init_and_add() fail on namespace collision? Is it the
problem that it's going to fail, or that it's not trivial to statically
determine whether it'll fail?

Sorry, but I don't see something actionable about this.