On Mon, Apr 04, 2016 at 05:37:58PM -0400, Paul Moore wrote: > On Monday, April 04, 2016 05:56:26 AM Greg KH wrote: > > On Mon, Apr 04, 2016 at 12:02:42AM -0400, wmealing wrote: > > > From: Wade Mealing <wmealing@xxxxxxxxxx> > > > > > > Gday, > > > > > > I'm looking to create an audit trail for when devices are added or removed > > > from the system. > > > > Then please do it in userspace, as I suggested before, that way you > > catch all types of devices, not just USB ones. > > Audit has some odd requirements placed on it by some of its users. I think > most notable in this particular case is the need to take specific actions, > including panicking the system, when audit records can't be sent to userspace > and are "lost". Granted, it's an odd requirement, definitely not the > norm/default configuration, but supporting weird stuff like this has allowed > Linux to be used on some pretty interesting systems that wouldn't have been > possible otherwise. Looking quickly at some of the kobject/uvent code, it > doesn't appear that the uevent/netlink channel has this capability. Are you sure you can loose netlink messages? If you do, you know you lost them, so isn't that good enough? > It also just noticed that it looks like userspace can send fake uevent > messages; That's how your machine boots properly :) > I haven't looked at it closely enough yet, but that may be a concern > for users which restrict/subdivide root using a LSM ... although it is > possible that the LSM policy could help here. I'm thinking aloud a bit right > now, but for SELinux the netlink controls aren't very granular and sysfs can > be tricky so I can't say for certain about blocking fake events from userspace > using LSMs/SELinux. uevents are not tied into LSMs from what I can tell, so I don't understand wht you are talking about here, sorry. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
