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