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

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Message-ID: <a48aad932c2c70148b273e1d32909a99977b3316.camel@sipsolutions.net>
Date: Thu, 08 Jan 2026 11:33:24 +0100
From: Johannes Berg <johannes@...solutions.net>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "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

On Thu, 2026-01-08 at 11:32 +0100, Eric Dumazet 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
> > > to user space.
> > 
> > Heh, wow. Talk about old code.
> > 
> > > Reported-by: syzbot+bfc7323743ca6dbcc3d3@...kaller.appspotmail.com
> > > https://lore.kernel.org/netdev/695f83f3.050a0220.1c677c.0392.GAE@google.com/T/#u
> > 
> > Was that intentionally without Link: or some other tag?
> 
> Somehow the Closes: prefix has been lost when I cooked the patch.
> 
> Closes: https://lore.kernel.org/netdev/695f83f3.050a0220.1c677c.0392.GAE@google.com/T/#u
> 
> Let me know if you want a V2, thanks.

I'll add it, no worries.

johannes