On 8/3/22 20:16, Kyle Huey wrote: > When management of the PKRU register was moved away from XSTATE, emulation > of PKRU's existence in XSTATE was added for APIs that read XSTATE, but not > for APIs that write XSTATE. This can be seen by running gdb and executing > `p $pkru`, `set $pkru = 42`, and `p $pkru`. On affected kernels (5.14+) the > write to the PKRU register (which gdb performs through ptrace) is ignored. Do you happen to have a reproducer for this sitting around? I'd love to get an addition to the pkeys selftest/ in place to make sure we don't break this again. PKRU is a very special snowflake.
