linux-kernel - Re: Subject: [PATCH 0/1] SGX self test fails

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Date:   Mon, 3 May 2021 18:38:07 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Tim Gardner <tim.gardner@...onical.com>
Cc:     dave.hansen@...ux.intel.com, shuah@...nel.org,
        linux-sgx@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Subject: [PATCH 0/1] SGX self test fails

On Thu, Apr 29, 2021 at 12:39:51PM -0600, Tim Gardner wrote:
> I'm just starting my learning curve on SGX, so I don't know if I've missed
> some setup for the SGX device entries. After looking at arch/x86/kernel/cpu/sgx/driver.c
> I see that there is no mode value for either sgx_dev_enclave or sgx_dev_provision.

Take a look at

https://github.com/systemd/systemd/pull/18944

> With this patch I can get the SGX self test to complete:
> 
> sudo ./test_sgx
> Warning: no execute permissions on device file /dev/sgx_enclave
> 0x0000000000000000 0x0000000000002000 0x03
> 0x0000000000002000 0x0000000000001000 0x05
> 0x0000000000003000 0x0000000000003000 0x03
> SUCCESS
> 
> Is the warning even necessary ?
> 
> Tim

With a quick look, I think that check is too strict. AFAIK, mmap(PROT_EXEC)
can be done, as long as the file is not in a noexec FS.

Dave?

For reference:

https://lore.kernel.org/linux-sgx/20210318194301.11D9A984@viggo.jf.intel.com/

/Jarkko