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

On 05/16/2018 10:35 PM, Ram Pai wrote:

So let me see if I understand the overall idea.

Application can allocate new keys through a new syscall
sys_pkey_alloc_1(flags, init_val, sig_init_val)

'sig_init_val' is the permission-state of the key in signal context.

I would keep the existing system call and just add a flag, say 
PKEY_ALLOC_SETSIGNAL.  If the current thread needs different access 
rights, it can set those rights just after pkey_alloc returns.  There is 
no race that matters here, I think.

Thanks,
Florian