linux-kernel - Re: [PATCH v20 00/28] Intel SGX1 support

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Date:   Wed, 15 May 2019 07:27:02 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        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: [PATCH v20 00/28] Intel SGX1 support


> On May 15, 2019, at 4:00 AM, Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> wrote:
> 
>> On Wed, May 15, 2019 at 01:35:31PM +0300, Jarkko Sakkinen wrote:
>> This brings me to an open question in Andy's model: lets say that we
>> change the source for SIGSTRUCT from memory address to fd. How can the
>> policy prevent the use not creating a file containing a SIGSTRUCT and
>> passing fd of that to the EINIT ioctl?
> 

The policy will presumably check the label on the file that the fd points to.

> Also wondering if a path would be better than plain fd for defining a
> reasonable policy i.e. have sigstruct_path as part of the ioctl
> parameters and not sigstruct_fd.
> 

It would save two syscalls at the cost of a decent amount of complexity.