linux-kernel - RE: [RFC PATCH 6/9] x86/sgx: Require userspace to provide allowed prots to ADD

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Date:   Wed, 5 Jun 2019 11:10:44 +0000
From:   "Ayoun, Serge" <serge.ayoun@...el.com>
To:     "Christopherson, Sean J" <sean.j.christopherson@...el.com>
CC:     Andy Lutomirski <luto@...nel.org>,
        "Xing, Cedric" <cedric.xing@...el.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...isplace.org>,
        "selinux@...r.kernel.org" <selinux@...r.kernel.org>,
        Jethro Beekman <jethro@...tanix.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        "Jarkko Sakkinen" <jarkko.sakkinen@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Svahn, Kai" <kai.svahn@...el.com>, Borislav Petkov <bp@...en8.de>,
        Josh Triplett <josh@...htriplett.org>,
        "Huang, Kai" <kai.huang@...el.com>,
        David Rientjes <rientjes@...gle.com>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        "Tricca, Philip B" <philip.b.tricca@...el.com>
Subject: RE: [RFC PATCH 6/9] x86/sgx: Require userspace to provide allowed
 prots to ADD_PAGES

> 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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