From: Greg KH <gregkh@linuxfoundation.org>
To: Oliver Neukum <oneukum@suse.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: Hardening the parser during enumerations
Date: Thu, 11 Apr 2024 16:09:30 +0200 [thread overview]
Message-ID: <2024041116-unicorn-washbasin-ba17@gregkh> (raw)
In-Reply-To: <20240411124722.17343-1-oneukum@suse.com>
On Thu, Apr 11, 2024 at 02:42:58PM +0200, Oliver Neukum wrote:
> The parser we use to enumerate a new device has no hardening
> against nonsensical descriptors at all. This is a bit optimistic
>
When it was written, we trusted hardware, all we had to do was get it
working properly as all USB devices were supposed to have passed the
USB-IF's validation before it got to us.
Right now, we barely trust USB descriptors, if we wish to change this
threat-model, that's great, but I think a lot of work is still to be
done as you prove here.
thanks,
greg k-h
next prev parent reply other threads:[~2024-04-11 14:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-11 12:42 Hardening the parser during enumerations Oliver Neukum
2024-04-11 12:42 ` [RFC 1/6] usb: usb_parse_endpoint ignore reserved bits Oliver Neukum
2024-04-11 14:11 ` Greg KH
2024-04-11 14:27 ` Oliver Neukum
2024-04-11 14:58 ` Greg KH
2024-04-11 15:35 ` Alan Stern
2024-04-11 15:40 ` Oliver Neukum
2024-04-11 12:43 ` [RFC 2/6] usb: avoid overrunning a buffer in usb_parse_interface Oliver Neukum
2024-04-11 15:39 ` Alan Stern
2024-04-11 17:36 ` Alan Stern
2024-04-11 12:43 ` [RFC 3/6] usb: usb_parse_endpoint needs to guard against short descriptors Oliver Neukum
2024-04-11 15:57 ` Alan Stern
2024-04-11 12:43 ` [RFC 4/6] usb: usb_parse_endpoint guard against an incromprehensible preamble Oliver Neukum
2024-04-11 16:00 ` Alan Stern
2024-04-11 12:43 ` [RFC 5/6] usb: usb_parse_endpoint must not count duplicated endpoints Oliver Neukum
2024-04-11 16:04 ` Alan Stern
2024-04-11 12:43 ` [RFC 6/6] usb: config: find_next_descriptor can overflow buffer Oliver Neukum
2024-04-11 16:16 ` Alan Stern
2024-04-11 14:09 ` Greg KH [this message]
2024-04-11 15:37 ` Hardening the parser during enumerations Oliver Neukum
2024-04-12 7:54 ` Greg KH
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