linux-kernel - Re: [PATCH v22 00/24] Intel SGX foundations

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Message-ID: <8339d3c0-8e80-9cd5-948e-47733f7c29b7@intel.com>
Date:   Sat, 14 Sep 2019 08:32:38 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        sean.j.christopherson@...el.com, nhorman@...hat.com,
        npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, bp@...en8.de, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
        cedric.xing@...el.com
Subject: Re: [PATCH v22 00/24] Intel SGX foundations

On 9/14/19 6:41 AM, Jarkko Sakkinen wrote:
> 
> The proposed LSM hooks give the granularity to make yes/no decision
> based on the
> 
> * The origin of the source of the source for the enclave.
> * The requested permissions for the added or mapped peage.
> 
> The hooks to do these checks are provided for mmap() and EADD
> operations.
> 
> With just file permissions you can still limit mmap() by having a
> privileged process to build the enclaves and pass the file descriptor
> to the enclave user who can mmap() the enclave within the constraints
> set by the enclave pages (their permissions refine the roof that you
> can mmap() any memory range within an enclave).

The LSM hooks are presumably fixing a problem that these patches
introduce.  What's that problem?