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From: Jarkko Sakkinen <jarkko@kernel.org>
To: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Shuah Khan <shuah@kernel.org>,
	haitao.huang@intel.com, Kai Huang <kai.huang@intel.com>,
	x86@kernel.org, linux-sgx@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-kselftest@vger.kernel.org,
	Jia Zhang <zhang.jia@linux.alibaba.com>
Subject: Re: [PATCH] x86/sgx: Allows ioctl PROVISION to execute before CREATE
Date: Wed, 20 Jan 2021 16:31:00 +0200	[thread overview]
Message-ID: <YAg+pLjGZTZvx0ln@kernel.org> (raw)
In-Reply-To: <20210118133335.98907-1-tianjia.zhang@linux.alibaba.com>

On Mon, Jan 18, 2021 at 09:33:35PM +0800, Tianjia Zhang wrote:
> In function sgx_encl_create(), the logic of directly assigning
> value to attributes_mask determines that the call to
> SGX_IOC_ENCLAVE_PROVISION must be after the command of
> SGX_IOC_ENCLAVE_CREATE. If change this assignment statement to
> or operation, the PROVISION command can be executed earlier and
> more flexibly.
> 
> Reported-by: Jia Zhang <zhang.jia@linux.alibaba.com>
> Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
> ---

Why?

>  arch/x86/kernel/cpu/sgx/ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c
> index f45957c05f69..0ca3fc238bc2 100644
> --- a/arch/x86/kernel/cpu/sgx/ioctl.c
> +++ b/arch/x86/kernel/cpu/sgx/ioctl.c
> @@ -108,7 +108,7 @@ 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;
> +	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
> 
> 

      parent reply	other threads:[~2021-01-20 14:37 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-18 13:33 [PATCH] x86/sgx: Allows ioctl PROVISION to execute before CREATE Tianjia Zhang
2021-01-19 20:05 ` Sean Christopherson
2021-01-20  3:57   ` Tianjia Zhang
2021-01-20 22:34     ` Jarkko Sakkinen
2021-01-20 22:37       ` Jarkko Sakkinen
2021-01-24  6:36         ` Tianjia Zhang
2021-01-20 14:31 ` Jarkko Sakkinen [this message]

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