[RFC PATCH 6/9] x86/sgx: Require userspace to provide allowed prots to ADD_PAGES

[Ayoun, Serge]

> From: Christopherson, Sean J
> Sent: Saturday, June 01, 2019 02:32
> 
>  /**
>   * struct sgx_enclave_add_pages - parameter structure for the
>   *                                %SGX_IOC_ENCLAVE_ADD_PAGES ioctl
> @@ -39,6 +44,7 @@ struct sgx_enclave_create  {
>   * @secinfo:	address for the SECINFO data (common to all pages)
>   * @nr_pages:	number of pages (must be virtually contiguous)
>   * @mrmask:	bitmask for the measured 256 byte chunks (common to all
> pages)
> + * @flags:	flags, e.g. SGX_ALLOW_{READ,WRITE,EXEC} (common to all
> pages)
>   */
>  struct sgx_enclave_add_pages {
>  	__u64	addr;
> @@ -46,7 +52,8 @@ struct sgx_enclave_add_pages {
>  	__u64	secinfo;
>  	__u32	nr_pages;
>  	__u16	mrmask;
> -} __attribute__((__packed__));
> +	__u16	flags;
> +};

You are adding a flags member. The secinfo structure has already a flags member in it.
Why do you need both - they are both coming from user mode. What kind of scenario would
require having different values. Seems confusing.

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