Gentoo Archives: gentoo-user

From: Dale <rdalek1967@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] cdrecord - devname - was burning a dvd+r dl...
Date: Wed, 08 Oct 2008 10:33:20
Message-Id: 48EC8C55.1000604@gmail.com
In Reply to: Re: [gentoo-user] cdrecord - devname - was burning a dvd+r dl... by Joerg.Schilling@fokus.fraunhofer.de (Joerg Schilling)
1 Joerg Schilling wrote:
2 > Dale <rdalek1967@×××××.com> wrote:
3 >
4 >
5 >>> In Autumn 2004 this bug was not fixed but the SCSI Linux kernel interface
6 >>> was changed in an incompatible way. Now _some_ SCSI commands work as non-root.
7 >>>
8 >>> SCSI is a try and error protocol and cdrecord checks which commands are working.
9 >>> If it is possible to burn with the limuted non-root command set, it _may_ work
10 >>> but there is a high risk for buffer underruns. In this case cdrecord believes
11 >>> that you own a really dumb burner that does not support most of the nice
12 >>> features....
13 >>>
14 >>> Jörg
15 >>>
16 >
17 >
18 >> So that I have a better understanding of this, if he is not a member of
19 >> the cd/cdrw group then the command would still work as a user?
20 >>
21 >
22 > Since the original security bug hass not been fxed, you are able so send
23 > a limit set of SCSI commands if you are able to open the device read-only.
24 > Libscg opens the devices read/write, so the only effect of such a grup
25 > membership is that cdrecord is able to open the device.
26 >
27 > Jörg
28 >
29 >
30
31 Then what is the point of having a cd/cdrw group? It doesn't seem to
32 have "secured" much of anything by having it.
33
34 Dale aka confused. It's ok. It's normal for me.
35
36 :-) :-)

Replies

Subject Author
Re: [gentoo-user] cdrecord - devname - was burning a dvd+r dl... Joerg.Schilling@fokus.fraunhofer.de (Joerg Schilling)