linux-kernel - Re: [intel-sgx-kernel-dev] [PATCH v5 10/11] intel

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Message-ID: <20171114203115.cuwsgwxzadqn7d4u@linux.intel.com>
Date:   Tue, 14 Nov 2017 22:31:15 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     intel-sgx-kernel-dev@...ts.01.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [intel-sgx-kernel-dev] [PATCH v5 10/11] intel_sgx: glue code for
 in-kernel LE

On Tue, Nov 14, 2017 at 10:16:43AM -0800, Sean Christopherson wrote:
> This semaphore approach is broken due to the LE process using an anon inode for
> /dev/sgx, which results in sgx_release being called without an accompanying call
> to sgx_open.  This causes deadlocks due to a semaphore underrun.
> 
> https://lists.01.org/pipermail/intel-sgx-kernel-dev/2017-November/000901.html

Thank you for catching this. I can only say that I forgot to fix it it
for v5. It will be refined for v6.

/Jarkko