resides in a compartment at a higher hardware privilege level
than the code causing the RSE stores and loads, making it inaccessible to application code." This doesn't mean that buffer overflows can't occur, but when they do, only application data will be corrupted, not the control information.
Multiple privilege levels
and MPU-based access control isolates applications to reduce the SoC's vulnerability to attack
Retains the three privilege levels
: basic, standard and enhanced, but removes entry level, which Governors say is bureaucratic and penalises prisoners who are new - setting up an adversarial relationship with staff from the outset
According to Intel, the exploit is a way for an attacker to observe the content of privileged memory, exploiting a CPU technique called speculative execution to circumvent expected privilege levels
. That can give an attacker access to data it normally wouldn't, though Intel has said that the data won't be deleted or modified.
They don't require any user interaction, they affect the default configuration, and the software runs at the highest privilege levels
possible," Tavis Ormandy, of Google's Project Zero team, wrote in a company blog post June 28.
In developing the plan's design, American Correctional Association standards surrounding segregation unit procedures and privilege levels
served as the minimum guidelines that control units would have to exceed.