Re: [PATCH] pkeys: Introduce PKEY_ALLOC_SIGNALINHERIT and change signal semantics

On May 14, 2018, at 5:01 AM, Florian Weimer [off-list ref] wrote:

quoted

One thing we could do, though: the current initual state on process
creation is all access blocked on all keys.  We could change it so that
half the keys are fully blocked and half are read-only.  Then we could add
a PKEY_ALLOC_STRICT or similar that allocates a key with the correct
initial state*and*  does the setsignal thing.  If there are no keys left
with the correct initial state, then it fails.

The initial PKRU value can currently be configured by the system administrator.  I fear this approach has too many moving parts to be viable.

Honestly, I think we should drop that option. I don’t see how we can expect an administrator to do this usefully.