linux-kernel - Re: [PATCH] selftests/sgx: remove checks for file execute permissions

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Date:   Mon, 21 Jun 2021 14:08:10 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, tim.gardner@...onical.com,
        jarkko@...nel.org, shuah@...nel.org, linux-sgx@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] selftests/sgx: remove checks for file execute permissions

Hi Dave,

On 6/21/2021 12:05 PM, Dave Hansen wrote:
> 
> The SGX selftests can fail for a bunch of non-obvious reasons
> like 'noexec' permissions on /dev (which is the default *EVERYWHERE*
> it seems).
> 
> A new test mistakenly also looked for +x permission on the
> /dev/sgx_enclave.  File execute permissions really only apply to
> the ability of execve() to work on a file, *NOT* on the ability
> for an application to map the file with PROT_EXEC.  SGX needs to
> mmap(PROT_EXEC), but doesn't need to execve() the device file.
> 
> Remove the check.
> 
> Fixes: 4284f7acb78b ("selftests/sgx: Improve error detection and messages")
> Reported-by: Tim Gardner <tim.gardner@...onical.com>
> Cc: Jarkko Sakkinen <jarkko@...nel.org>
> Cc: Reinette Chatre <reinette.chatre@...el.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: linux-sgx@...r.kernel.org
> Cc: linux-kselftest@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> 

Thank you very much for fixing this. With this applied the SGX tests are 
able to run again on my system.

Tested-by: Reinette Chatre <reinette.chatre@...el.com>

I think it is missing a "Signed-off-by".

Reinette