* Dave Hansen: > On 11/8/18 4:05 AM, Florian Weimer wrote: >> Would it be possible to reserve a bit for PKEY_DISABLE_READ? >> >> I think the POWER implementation can disable read access at the hardware >> level, but not write access, and that cannot be expressed with the >> current PKEY_DISABLE_ACCESS and PKEY_DISABLE_WRITE bits. > > Do you just mean in the syscall interfaces? What would we need to do on > x86 if we see the bit? Would we just say it's invalid on x86, or would > we make sure that PKEY_DISABLE_ACCESS==PKEY_DISABLE_READ? Ideally, PKEY_DISABLE_READ | PKEY_DISABLE_WRITE and PKEY_DISABLE_READ | PKEY_DISABLE_ACCESS would be treated as PKEY_DISABLE_ACCESS both, and a line PKEY_DISABLE_READ would result in an EINVAL failure. Thanks, Florian
