lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sat, 19 Aug 2023 22:10:36 +0900
From: Vincent Mailhol <vincent.mailhol@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Martin Hundebøll <martin@...nix.com>, 
	Wolfgang Grandegger <wg@...ndegger.com>, Marc Kleine-Budde <mkl@...gutronix.de>, 
	"David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Paolo Abeni <pabeni@...hat.com>, Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
	linux-can <linux-can@...r.kernel.org>, netdev <netdev@...r.kernel.org>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] can: netlink: support setting hardware filters

On Sat. 19 Aug. 2023, 01:19, Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Thu, 17 Aug 2023 12:10:13 +0200 Martin Hundebøll wrote:
> > +             int len = nla_len(data[IFLA_CAN_HW_FILTER]);
> > +             int num_filter = len / sizeof(struct can_filter);
> > +             struct can_filter *filter = nla_data(data[IFLA_CAN_HW_FILTER]);
>
> This will prevent you from ever extending struct can_filter in
> a backward-compatible fashion, right? I obviously know very little
> about CAN but are you confident a more bespoke API to manipulate
> filters individually and allow extensibility is not warranted?

I follow Jakub's point of view.

The current struct can_filter is not sound. Some devices such as the
ES582.1 supports filtering of the CAN frame based on the flags (i.e.
SFF/EFF, RTR, FDF).

I think that each of the fields of the filter should have its own NLA
declaration with the whole thing wrapped within a NLA_NESTED_ARRAY.

I also think that there should then be a method to report the precise
filtering capabilities of the hardware.


Yours sincerely,
Vincent Mailhol

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ