linux-kernel - [PATCH v5 2/3] x86/sgx: Allows ioctl PROVISION to execute before CREATE

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Date:   Tue, 16 Feb 2021 11:31:32 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        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>
Cc:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Subject: [PATCH v5 2/3] x86/sgx: Allows ioctl PROVISION to execute before CREATE

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(), this will allow users to perform ioctl PROVISION
operations before ioctl CREATE, increase the flexibility of
the API and reduce restrictions.

Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
---
 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 8ce6d8371cfb..892e2a2a3221 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