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

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Message-ID: <alpine.LRH.2.21.1905160844130.29250@namei.org>
Date:   Thu, 16 May 2019 08:46:28 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Andy Lutomirski <luto@...nel.org>
cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>, selinux@...r.kernel.org,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jethro Beekman <jethro@...tanix.com>,
        "Xing, Cedric" <cedric.xing@...el.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 Wed, 15 May 2019, Andy Lutomirski wrote:

> > Why not just use an xattr, like security.sgx ?
> 
> Wouldn't this make it so that only someone with CAP_MAC_ADMIN could
> install an enclave?  I think that this decision should be left up the
> administrator, and it should be easy to set up a loose policy where
> anyone can load whatever enclave they want.  That's what would happen
> in my proposal if there was no LSM loaded or of the LSM policy didn't
> restrict what .sigstruct files were acceptable.
> 

You could try user.sigstruct, which does not require any privs.

-- 
James Morris
<jmorris@...ei.org>