ECPM permissions are mentioned in SDM EADD instruction operation. PTE I 
don't know.

--
Jethro Beekman | Fortanix

On 2019-08-07 08:17, Jarkko Sakkinen wrote:
> On Wed, Aug 07, 2019 at 06:15:34PM +0300, Jarkko Sakkinen wrote:
>> On Mon, Jul 29, 2019 at 11:17:57AM +0000, Ayoun, Serge wrote:
>>>> +	/* TCS pages need to be RW in the PTEs, but can be 0 in the EPCM. */
>>>> +	if ((secinfo.flags & SGX_SECINFO_PAGE_TYPE_MASK) ==
>>>> SGX_SECINFO_TCS)
>>>> +		prot |= PROT_READ | PROT_WRITE;
>>>
>>> For TCS pages you add both RD and WR maximum protection bits.
>>> For the enclave to be able to run, user mode will have to change the
>>> "vma->vm_flags" from PROT_NONE to PROT_READ | PROT_WRITE (otherwise
>>> eenter fails).  This is exactly what your selftest  does.
>>
>> Recap where the TCS requirements came from? Why does it need
>> RW in PTEs and can be 0 in the EPCM? The comment should explain
>> it rather leave it as a claim IMHO.
> 
> I mean after ~3 weeks of not looking into SGX (because being
> on vacation etc.) I cannot remember details of this.
> 
> /Jarkko
>