On Wed, May 2, 2018 at 2:13 PM Ram Pai <linuxram@xxxxxxxxxx> wrote: > > Ram, would you please comment? > on POWER the pkey behavior will remain the same at entry or at exit from > the signal handler. For eg: if a key is read-disabled on entry into > the signal handler, and gets read-enabled in the signal handler, than it > will continue to be read-enabled on return from the signal handler. > In other words, changes to key permissions persist across signal > boundaries. I don't know about POWER's ISA, but this is crappy behavior. If a thread temporarily grants itself access to a restrictive memory key and then gets a signal, the signal handler should *not* have access to that key.
