linux-kernel - Re: [PATCH v3 4/5] x86/sgx: Allows ioctl PROVISION to execute before CREATE

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Date:   Sat, 30 Jan 2021 15:26:20 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Shuah Khan <shuah@...nel.org>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jia Zhang <zhang.jia@...ux.alibaba.com>
Subject: Re: [PATCH v3 4/5] x86/sgx: Allows ioctl PROVISION to execute before
 CREATE

On Sun, Jan 24, 2021 at 02:29:06PM +0800, Tianjia Zhang wrote:
> In the function sgx_create_enclave(), the direct assignment
> operation of attributes_mask determines that the ioctl PROVISION
> operation must be executed after the ioctl CREATE operation,
> which will limit the flexibility of sgx developers.
> 
> This patch takes the assignment of `attributes_mask` from the
> function sgx_create_enclave() has been moved to the function
> sgx_open() to avoid this restriction.
> 
> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>

The commit message should explicit that the API behaviour changes
as the result. Please don't use hyphens in quoting.

/Jarkko

> ---
>  arch/x86/kernel/cpu/sgx/driver.c | 1 +
>  arch/x86/kernel/cpu/sgx/ioctl.c  | 1 -
>  2 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/sgx/driver.c b/arch/x86/kernel/cpu/sgx/driver.c
> index f2eac41bb4ff..fba0d0bfe976 100644
> --- a/arch/x86/kernel/cpu/sgx/driver.c
> +++ b/arch/x86/kernel/cpu/sgx/driver.c
> @@ -36,6 +36,7 @@ static int sgx_open(struct inode *inode, struct file *file)
>  		return ret;
>  	}
>  
> +	encl->attributes_mask = SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT | SGX_ATTR_KSS;
>  	file->private_data = encl;
>  
>  	return 0;
> diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c
> index 90a5caf76939..1c6ecf9fbeff 100644
> --- a/arch/x86/kernel/cpu/sgx/ioctl.c
> +++ b/arch/x86/kernel/cpu/sgx/ioctl.c
> @@ -109,7 +109,6 @@ static int sgx_encl_create(struct sgx_encl *encl, struct sgx_secs *secs)
>  	encl->base = secs->base;
>  	encl->size = secs->size;
>  	encl->attributes = secs->attributes;
> -	encl->attributes_mask = SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT | SGX_ATTR_KSS;
>  
>  	/* Set only after completion, as encl->lock has not been taken. */
>  	set_bit(SGX_ENCL_CREATED, &encl->flags);
> -- 
> 2.19.1.3.ge56e4f7
> 
>