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Date: Wed, 26 Aug 2026 08:08:48 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: syzbot <syzbot@kernel.org>, syzkaller-bugs@googlegroups.com,
	Marco Elver <elver@google.com>,
	Yehezkel Bernat <YehezkelShB@gmail.com>,
	Andreas Noever <andreas.noever@gmail.com>,
	linux-usb@vger.kernel.org, Mika Westerberg <westeri@kernel.org>,
	linux-kernel@vger.kernel.org, syzbot@lists.linux.dev
Subject: Re: [PATCH] thunderbolt: Validate BAR 0 resource type and size
Message-ID: <2026082622-bunkmate-bleep-6716@gregkh>
References: <9e0d4fdc-4e1d-4195-80c0-7a70d34d1fc2@mail.kernel.org>
 <20260826043929.GM893316@black.igk.intel.com>
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In-Reply-To: <20260826043929.GM893316@black.igk.intel.com>

On Wed, Aug 26, 2026 at 06:39:29AM +0200, Mika Westerberg wrote:
> Hi,
> 
> On Tue, Aug 25, 2026 at 04:09:37PM +0000, syzbot wrote:
> > From: Marco Elver <elver@google.com>
> > 
> > The thunderbolt driver can crash with a page fault if it binds to an
> > arbitrary PCI device (e.g., via sysfs driver_override) that has an I/O port
> > BAR at index 0 instead of an MMIO BAR.
> 
> Well, if you bind it to a random PCIe device you get what you asked for.
> This is specifically the reason we have the PCI IDs and the like in the
> drivers. Anything outside of that you need to know what you are doing.
> 

And again, I keep telling the syzbot people that this is not a valid
thing to care about...