On Thu, Oct 26, 2023 at 08:01:36PM +0530, Kanchan Joshi wrote: > On 10/24/2023 12:37 PM, Christoph Hellwig wrote: > > On Mon, Oct 23, 2023 at 09:18:36AM -0600, Keith Busch wrote: > >> On Mon, Oct 23, 2023 at 07:44:56AM +0200, Christoph Hellwig wrote: > >>> Yes, you need someone with root access to change the device node > >>> persmissions. But we allowed that under the assumption it is safe > >>> to do so, which it turns out it is not. > >> > >> Okay, iiuc, while we have to opt-in to allow this hole, we need another > >> option for users to set to allow this usage because it's not safe. > >> > >> Here are two options I have considered for unpriveledged access, please > >> let me know if you have others or thoughts. > >> > >> Restrict access for processes with CAP_SYS_RAWIO, which can be granted > >> to non-root users. This cap is already used in scsi subsystem, too. > > > > Well, that's sensible in general. > > With that someone needs to make each binary (that wants to use > passthrough) capability-aware by doing: > > setcap "CAP_SYS_RAWIO=ep" <binary> > > Seems extra work for admins (or distros if they need to ship the binary > that way). The way I usually see it done is add the capability to the user so any binary executed by that user already has the caps.
