linux-kernel - Re: [PATCH net] net: bridge: fix ioctl old

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Date:   Thu, 23 Dec 2021 14:33:40 +0100
From:   Remi Pommarel <repk@...plefau.lt>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Networking <netdev@...r.kernel.org>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        bridge@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: bridge: fix ioctl old_deviceless bridge argument

On Thu, Dec 23, 2021 at 12:38:14PM +0100, Arnd Bergmann wrote:
> On Thu, Dec 23, 2021 at 12:00 PM Remi Pommarel <repk@...plefau.lt> wrote:
> >
> > On Wed, Dec 22, 2021 at 10:52:20PM +0100, Arnd Bergmann wrote:
> > > On Wed, Dec 22, 2021 at 8:13 PM Remi Pommarel <repk@...plefau.lt> wrote:
> > [...]
> > >
> > > The intention of my broken patch was to make it work for compat mode as I did
> > > in br_dev_siocdevprivate(), as this is now the only bit that remains broken.
> > >
> > > This could be done along the lines of the patch below, if you see any value in
> > > it. (not tested, probably not quite right).
> >
> > Oh ok, because SIOC{S,G}IFBR compat ioctl was painfully done with
> > old_bridge_ioctl() I didn't think those needed compat. So I adapted and
> > fixed your patch to get that working.
> 
> Ok, thanks!
> 
> > Here is my test results.
> >
> > With my initial patch only :
> >   - 64bit busybox's brctl (working)
> >     # brctl show
> >     bridge name     bridge id               STP enabled     interfaces
> >     br0             8000.000000000000       n
> >
> >   - CONFIG_COMPAT=y + 32bit busybox's brctl (not working)
> >     # brctl show
> >     brctl: SIOCGIFBR: Invalid argument
> >
> > With both my intial patch and the one below :
> >   - 64bit busybox's brctl (working)
> >     # brctl show
> >     bridge name     bridge id               STP enabled     interfaces
> >     br0             8000.000000000000       n
> >
> >   - CONFIG_COMPAT=y + 32bit busybox's brctl (working)
> >     # brctl show
> >     bridge name     bridge id               STP enabled     interfaces
> >     br0             8000.000000000000       n
> >
> > If you think this has enough value to fix those compatility issues I can
> > either send the below patch as a V2 replacing my initial one for net
> > or sending it as a separate patch for net-next. What would you rather
> > like ?
> 
> If 32-bit busybox still uses those ioctls in moderately recent
> versions, then it's probably worth doing this, but that would
> be up to the bridge maintainers.
> 
> Your patch looks good to me, I see you caught a few mistakes
> in my prototype. I would however suggest basing it on top of
> your original fix, so that can be applied first and backported
> to stable kernels, while the new patch would go on top and
> not get backported.
> 
> If that works with everyone, please submit those two, and add
> these tags to the second patch:
> 
> Co-developed-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Ok thanks a lot, will send a new patch serie with both patches so
that bridge maintainers could only pick one or both patches.

-- 
Remi