linux-kernel - Re: SGX vs LSM (Re: [PATCH v20 00/28] Intel SGX1 support)

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Date:   Mon, 3 Jun 2019 23:43:53 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Stephen Smalley <sds@...ho.nsa.gov>,
        "Xing, Cedric" <cedric.xing@...el.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        William Roberts <bill.c.roberts@...il.com>,
        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>,
        "Dr. Greg" <greg@...ellic.com>,
        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>,
        "Ayoun, Serge" <serge.ayoun@...el.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.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>
Subject: Re: SGX vs LSM (Re: [PATCH v20 00/28] Intel SGX1 support)

On Thu, May 30, 2019 at 07:31:14AM -0700, Andy Lutomirski wrote:
>  - To create an X mapping of an enclave page that came from EADD, you
> need EXECUTE on the source file.  Optionally, we could also permit
> this if you have EXECMOD.

Source file? EADD ioctl takes memory buffer in right now.

> And I have two design proposals.  One is static and one is dynamic.
> To implement either one, we will probably need a new .may_mprotect vm
> operation, and that operation can call an LSM hook.  Or we can give
> LSMs a way to detect that a given vm_area_struct is an enclave.  As I
> see it, this is an implementation detail that is certainly solveable.

Why VM operation and not file operation?

> EADD takes an execute_intent flag.  It calls a new hook:
> 
>   int security_enclave_load(struct vm_area_struct *source, bool execute_intent);
> 
> This hook will fail if execute_intent==true and the caller has neither
> EXECUTE, EXECMOD, nor EXECMEM.
> 
> EAUG sets execute_intent = false.
> 
> EINIT takes a sigstruct pointer.  SGX can (when initially upstreamed
> or later on once there's demand) call a new hook:
> 
>   security_enclave_init(struct sigstruct *sigstruct, struct
> vm_area_struct *source);

What is the source VMA in these callbacks? Why is @execute_intent
needed anyway as a ioctl arugment and not deduced from SECINFO?

/Jarkko