Re: [Libusb-devel] udev craze: need /dev/bus/usb rationale

[Olivier Blin <oblin@mandriva.com>]

Kay Sievers <kay.sievers@vrfy.org> writes:

> On Fri, Jan 27, 2006 at 07:05:06AM +0300, Andrey Borzenkov wrote:
>> On Friday 27 January 2006 05:25, Greg KH wrote:
>> > > I want to understand the reason for these device nodes since they seem
>> > > to duplicate the nodes found in /proc/bus/usb. Is this just part of the
>> > > long term plans to remove usbdevfs?
>> >
>> > They duplicate those nodes identically.  But now we can use udev and pam
>> > and other tools to properly set the permissions and acls on the nodes.
>> > Much easier than doing it through usbfs mount permissions, which only
>> > work for all usbfs devices.
>> >
>> 
>> Does Mandrake have patched kernel procfs?

Not AFAIK, and we don't need that to modify owners in /proc
See our list of patches here:
https://cvs.mandriva.com/svn/mdv/cooker/kernel-2.6/current/PATCHES/patches/

>> they have been PAM-controlled as long as I remember. Not that I advocate 
>> keeping them (I do not care as long as higher-level tools work), just 
>> curious.
>
> Sure, primary ownership works as usual. We meant Access Control Lists,
> for multiple users at the same time, which are nice if you use
> fast-user-switching or have multi-head setups.

Couldn't we use dynamic groups instead of ACLs?
This would avoid running a tool to update ACLs at each device "add",
and require group updates only at user login/logout.

By the way, some pointers about the ACLs on tmpfs solution:
http://vrfy.org/log/pam_console.html
http://lkml.org/lkml/2006/1/8/231

-- 
Olivier Blin - Mandriva



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