On Sun, Nov 11, 2018 at 08:42:42AM -0500, Theodore Y. Ts'o wrote: > It really depends on the security model being used on a particular > system. I can easily imagine scenarios where userspace is allowed > full access to the device with respect to read/write/open, but the > security model doesn't want to allow access to various SCSI commands > such as firmware upload commands, TCG commads, the > soon-to-be-standardized Zone Activation Commands (which allow dynamic > conversion of HDD recording modes between CMR and SMR), etc. Well, that's what we have the security_file_ioctl() LSM hook for so that your security model can arbitrate access to ioctls.
