netdev - Re: [PATCH net] wifi: avoid kernel-infoleak from struct iw

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Message-ID: <CAOiHx=mWrizoJAOU=40NWk6A1+b99WCM1EkxVwLfiJ8Sv4pDKg@mail.gmail.com>
Date: Thu, 8 Jan 2026 13:25:51 +0100
From: Jonas Gorski <jonas.gorski@...il.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Johannes Berg <johannes@...solutions.net>, "David S . Miller" <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, linux-wireless@...r.kernel.org, 
	netdev@...r.kernel.org, eric.dumazet@...il.com, 
	syzbot+bfc7323743ca6dbcc3d3@...kaller.appspotmail.com, stable@...r.kernel.org
Subject: Re: [PATCH net] wifi: avoid kernel-infoleak from struct iw_point

Hi,

On Thu, Jan 8, 2026 at 12:28 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Thu, Jan 8, 2026 at 11:29 AM Johannes Berg <johannes@...solutions.net> wrote:
> >
> > On Thu, 2026-01-08 at 10:19 +0000, Eric Dumazet wrote:
> > > struct iw_point has a 32bit hole on 64bit arches.
> > >
> > > struct iw_point {
> > >   void __user   *pointer;       /* Pointer to the data  (in user space) */
> > >   __u16         length;         /* number of fields or size in bytes */
> > >   __u16         flags;          /* Optional params */
> > > };
> > >
> > > Make sure to zero the structure to avoid dislosing 32bits of kernel data

In case you do a V2: dislosing -> disclosing (I assume)

> > > to user space.

Best regards,
Jonas