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From:   Jethro Beekman <jethro@fortanix.com>
To:     "Xing, Cedric" <cedric.xing@intel.com>,
        "Hansen, Dave" <dave.hansen@intel.com>,
        Andy Lutomirski <luto@kernel.org>
CC:     Thomas Gleixner <tglx@linutronix.de>,
        "Dr. Greg" <greg@enjellic.com>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
        "linux-sgx@vger.kernel.org" <linux-sgx@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Christopherson, Sean J" <sean.j.christopherson@intel.com>,
        "nhorman@redhat.com" <nhorman@redhat.com>,
        "npmccallum@redhat.com" <npmccallum@redhat.com>,
        "Ayoun, Serge" <serge.ayoun@intel.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@intel.com>,
        "Huang, Haitao" <haitao.huang@intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        "Svahn, Kai" <kai.svahn@intel.com>, Borislav Petkov <bp@alien8.de>,
        Josh Triplett <josh@joshtriplett.org>,
        "Huang, Kai" <kai.huang@intel.com>,
        David Rientjes <rientjes@google.com>
Subject: Re: [PATCH v20 00/28] Intel SGX1 support
Thread-Topic: [PATCH v20 00/28] Intel SGX1 support
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Date:   Fri, 10 May 2019 19:04:18 +0000
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On 2019-05-10 11:56, Xing, Cedric wrote:
> Hi Jethro,
>  =20
>> ELF files are explicitly designed such that you can map them (with mma=
p)
>> in 4096-byte chunks. However, sometimes there's overlap and you will
>> sometimes see that a particular offset is mapped twice because the fir=
st
>> half of the page in the file belongs to an RX range and the second hal=
f
>> to an R-only range. Also, ELF files don't (normally) describe stack,
>> heap, etc. which you do need for enclaves.
>=20
> You have probably misread my email. By mmap(), I meant the enclave file=
 would be mapped via *multiple* mmap() calls, in the same way as what dlo=
pen() would do in loading regular shared object. The intention here is to=
 make the enclave file subject to the same checks as regular shared objec=
ts.

No, I didn't misread your email. My original point still stands:=20
requiring that an enclave's memory is created from one or more mmap=20
calls of a file puts significant restrictions on the enclave's on-disk=20
representation.

--
Jethro Beekman | Fortanix


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