From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kay Sievers Date: Tue, 26 Oct 2004 12:25:07 +0000 Subject: Re: permissions: udev vs. pam_devperm.so Message-Id: <1098793507.9714.49.camel@localhost.localdomain> List-Id: References: <417DF0A8.2060108@bio.ifi.lmu.de> In-Reply-To: <417DF0A8.2060108@bio.ifi.lmu.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Tue, 2004-10-26 at 08:37 +0200, Frank Steiner wrote: > when logging in via kdm on our SuSE, the pam_devperm module sets > permissions and owner of local devices like /dev/hdc (for cdrom). So > if user "bart" logs in, he get > > brw------- 1 bart disk 22, 0 Sep 23 2003 /dev/hdc > > > But on some events like calling k3b etc., hotplug/udev sometimes jump > in (not always) an re-detect the block device /dev/hdc, thus setting > the permissions back to the defaults: > > brw-rw---- 1 root disk 22, 0 Sep 23 2003 /dev/hdc > > This stops user bart from accessing the cdrom for burning etc. > > Can I tel udev to leave the permission of *existing* nodes untouched? > I figured out that I could set the line in the permissions file to > > hdc*:::660 > > but the drawback is that udev will create /dev/hdc with the defaults > root:root and 600 like defined in udev.conf, and not with root:disk 660 > like it should when no local user is logged in. Empty fields mean default permissions, so this will not work. udev will overwrite everything on "add". Only the inode may be preserved, if the node already exists with the correct major/minor. > Any way to achieve that? Like a flag "leave node untouched if it exists"? There is currently no way to tell udev about this. But this job can be done by a script in /etc/dev.d/. This will work with custom names too. Best, Kay ------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel