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From: Jethro Beekman <jethro@fortanix.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-sgx@vger.kernel.org
Cc: akpm@linux-foundation.org, dave.hansen@intel.com,
	sean.j.christopherson@intel.com, nhorman@redhat.com,
	npmccallum@redhat.com, haitao.huang@intel.com,
	andriy.shevchenko@linux.intel.com, tglx@linutronix.de,
	kai.svahn@intel.com, bp@alien8.de, josh@joshtriplett.org,
	luto@kernel.org, kai.huang@intel.com, rientjes@google.com,
	cedric.xing@intel.com, puiterwijk@redhat.com,
	linux-security-module@vger.kernel.org
Subject: Re: [PATCH v26 13/22] x86/sgx: Add provisioning
Date: Thu, 13 Feb 2020 11:49:18 +0100
Message-ID: <91744cc7-b50c-ffe2-1875-aba9174f7535@fortanix.com> (raw)
In-Reply-To: <20200209212609.7928-14-jarkko.sakkinen@linux.intel.com>

This patch and 22/22 contain the following email header:

Content-Type: text/plain; charset=a

git am doesn't like this.

--
Jethro Beekman | Fortanix

On 2020-02-09 22:26, Jarkko Sakkinen wrote:
> In order to provide a mechanism for devilering provisoning rights:
> 
> 1. Add a new device file /dev/sgx/provision that works as a token for
>    allowing an enclave to have the provisioning privileges.
> 2. Add a new ioctl called SGX_IOC_ENCLAVE_SET_ATTRIBUTE that accepts the
>    following data structure:
> 
>    struct sgx_enclave_set_attribute {
>            __u64 addr;
>            __u64 attribute_fd;
>    };
> 
> A daemon could sit on top of /dev/sgx/provision and send a file
> descriptor of this file to a process that needs to be able to provision
> enclaves.
> 
> The way this API is used is straight-forward. Lets assume that dev_fd is
> a handle to /dev/sgx/enclave and prov_fd is a handle to
> /dev/sgx/provision.  You would allow SGX_IOC_ENCLAVE_CREATE to
> initialize an enclave with the PROVISIONKEY attribute by
> 
> params.addr = <enclave address>;
> params.token_fd = prov_fd;
> 
> ioctl(dev_fd, SGX_IOC_ENCLAVE_SET_ATTRIBUTE, &params);
> 
> Cc: linux-security-module@vger.kernel.org
> Suggested-by: Andy Lutomirski <luto@kernel.org>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
>  arch/x86/include/uapi/asm/sgx.h  | 11 ++++++++
>  arch/x86/kernel/cpu/sgx/driver.c | 14 ++++++++++
>  arch/x86/kernel/cpu/sgx/driver.h |  2 ++
>  arch/x86/kernel/cpu/sgx/ioctl.c  | 47 ++++++++++++++++++++++++++++++++
>  4 files changed, 74 insertions(+)
> 
> diff --git a/arch/x86/include/uapi/asm/sgx.h b/arch/x86/include/uapi/asm/sgx.h
> index 5edb08ab8fd0..57d0d30c79b3 100644
> --- a/arch/x86/include/uapi/asm/sgx.h
> +++ b/arch/x86/include/uapi/asm/sgx.h
> @@ -25,6 +25,8 @@ enum sgx_page_flags {
>  	_IOWR(SGX_MAGIC, 0x01, struct sgx_enclave_add_pages)
>  #define SGX_IOC_ENCLAVE_INIT \
>  	_IOW(SGX_MAGIC, 0x02, struct sgx_enclave_init)
> +#define SGX_IOC_ENCLAVE_SET_ATTRIBUTE \
> +	_IOW(SGX_MAGIC, 0x03, struct sgx_enclave_set_attribute)
>  
>  /**
>   * struct sgx_enclave_create - parameter structure for the
> @@ -63,4 +65,13 @@ struct sgx_enclave_init {
>  	__u64 sigstruct;
>  };
>  
> +/**
> + * struct sgx_enclave_set_attribute - parameter structure for the
> + *				      %SGX_IOC_ENCLAVE_SET_ATTRIBUTE ioctl
> + * @attribute_fd:	file handle of the attribute file in the securityfs
> + */
> +struct sgx_enclave_set_attribute {
> +	__u64 attribute_fd;
> +};
> +
>  #endif /* _UAPI_ASM_X86_SGX_H */
> diff --git a/arch/x86/kernel/cpu/sgx/driver.c b/arch/x86/kernel/cpu/sgx/driver.c
> index b4aa7b9f8376..d90114cec1c3 100644
> --- a/arch/x86/kernel/cpu/sgx/driver.c
> +++ b/arch/x86/kernel/cpu/sgx/driver.c
> @@ -150,6 +150,13 @@ static struct miscdevice sgx_dev_enclave = {
>  	.fops = &sgx_encl_fops,
>  };
>  
> +static struct miscdevice sgx_dev_provision = {
> +	.minor = MISC_DYNAMIC_MINOR,
> +	.name = "provision",
> +	.nodename = "sgx/provision",
> +	.fops = &sgx_provision_fops,
> +};
> +
>  int __init sgx_drv_init(void)
>  {
>  	unsigned int eax, ebx, ecx, edx;
> @@ -190,5 +197,12 @@ int __init sgx_drv_init(void)
>  		return ret;
>  	}
>  
> +	ret = misc_register(&sgx_dev_provision);
> +	if (ret) {
> +		pr_err("Creating /dev/sgx/provision failed with %d.\n", ret);
> +		misc_deregister(&sgx_dev_enclave);
> +		return ret;
> +	}
> +
>  	return 0;
>  }
> diff --git a/arch/x86/kernel/cpu/sgx/driver.h b/arch/x86/kernel/cpu/sgx/driver.h
> index e4063923115b..72747d01c046 100644
> --- a/arch/x86/kernel/cpu/sgx/driver.h
> +++ b/arch/x86/kernel/cpu/sgx/driver.h
> @@ -23,6 +23,8 @@ extern u64 sgx_attributes_reserved_mask;
>  extern u64 sgx_xfrm_reserved_mask;
>  extern u32 sgx_xsave_size_tbl[64];
>  
> +extern const struct file_operations sgx_provision_fops;
> +
>  long sgx_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
>  
>  int sgx_drv_init(void);
> diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c
> index 83513cdfd1c0..262001df3ae4 100644
> --- a/arch/x86/kernel/cpu/sgx/ioctl.c
> +++ b/arch/x86/kernel/cpu/sgx/ioctl.c
> @@ -663,6 +663,50 @@ static long sgx_ioc_enclave_init(struct sgx_encl *encl, void __user *arg)
>  	return ret;
>  }
>  
> +/**
> + * sgx_ioc_enclave_set_attribute - handler for %SGX_IOC_ENCLAVE_SET_ATTRIBUTE
> + * @filep:	open file to /dev/sgx
> + * @arg:	userspace pointer to a struct sgx_enclave_set_attribute instance
> + *
> + * Mark the enclave as being allowed to access a restricted attribute bit.
> + * The requested attribute is specified via the attribute_fd field in the
> + * provided struct sgx_enclave_set_attribute.  The attribute_fd must be a
> + * handle to an SGX attribute file, e.g. “/dev/sgx/provision".
> + *
> + * Failure to explicitly request access to a restricted attribute will cause
> + * sgx_ioc_enclave_init() to fail.  Currently, the only restricted attribute
> + * is access to the PROVISION_KEY.
> + *
> + * Note, access to the EINITTOKEN_KEY is disallowed entirely.
> + *
> + * Return: 0 on success, -errno otherwise
> + */
> +static long sgx_ioc_enclave_set_attribute(struct sgx_encl *encl,
> +					  void __user *arg)
> +{
> +	struct sgx_enclave_set_attribute params;
> +	struct file *attribute_file;
> +	int ret;
> +
> +	if (copy_from_user(&params, arg, sizeof(params)))
> +		return -EFAULT;
> +
> +	attribute_file = fget(params.attribute_fd);
> +	if (!attribute_file)
> +		return -EINVAL;
> +
> +	if (attribute_file->f_op != &sgx_provision_fops) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	encl->allowed_attributes |= SGX_ATTR_PROVISIONKEY;
> +	ret = 0;
> +
> +out:
> +	fput(attribute_file);
> +	return ret;
> +}
>  
>  long sgx_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
>  {
> @@ -686,6 +730,9 @@ long sgx_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
>  	case SGX_IOC_ENCLAVE_INIT:
>  		ret = sgx_ioc_enclave_init(encl, (void __user *)arg);
>  		break;
> +	case SGX_IOC_ENCLAVE_SET_ATTRIBUTE:
> +		ret = sgx_ioc_enclave_set_attribute(encl, (void __user *)arg);
> +		break;
>  	default:
>  		ret = -ENOIOCTLCMD;
>  		break;
> 

  reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-09 21:25 [PATCH v26 00/22] Intel SGX foundations Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 01/22] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 02/22] x86/cpufeatures: x86/msr: Intel SGX Launch Control " Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 03/22] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 04/22] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 05/22] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 06/22] x86/cpu/intel: Detect SGX supprt Jarkko Sakkinen
2020-02-12 16:57   ` Sean Christopherson
2020-02-13 18:04     ` Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 07/22] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 08/22] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 09/22] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 10/22] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2020-02-13 13:59   ` Jethro Beekman
2020-02-13 18:07     ` Sean Christopherson
2020-02-14  9:24       ` Jethro Beekman
2020-02-14 17:11         ` Sean Christopherson
2020-02-14 17:40           ` Andy Lutomirski
2020-02-14 17:52             ` Sean Christopherson
2020-02-15 16:56               ` Andy Lutomirski
2020-02-18 22:12                 ` Sean Christopherson
2020-02-15 18:05           ` Dr. Greg
2020-02-15  7:32     ` Jarkko Sakkinen
2020-02-15  7:35       ` Jarkko Sakkinen
2020-02-19  3:26   ` Jordan Hand
2020-02-20 18:13     ` Sean Christopherson
2020-02-20 18:33       ` Jordan Hand
2020-02-20 18:48         ` Sean Christopherson
2020-02-20 22:16           ` Jarkko Sakkinen
2020-02-21  0:11             ` Jordan Hand
2020-02-21 12:53               ` Jarkko Sakkinen
2020-02-21  0:32             ` Andy Lutomirski
2020-02-21 13:01               ` Jarkko Sakkinen
2020-02-20 18:51       ` Andy Lutomirski
2020-02-20 19:15         ` Sean Christopherson
2020-02-20 22:10     ` Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 11/22] selftests/x86: Recurse into subdirectories Jarkko Sakkinen
2020-02-09 21:25 ` [PATCH v26 12/22] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 13/22] x86/sgx: Add provisioning Jarkko Sakkinen
2020-02-13 10:49   ` Jethro Beekman [this message]
2020-02-15  7:25     ` Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 14/22] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 15/22] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 16/22] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 17/22] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 18/22] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 19/22] x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions Jarkko Sakkinen
2020-02-13 13:29   ` Jethro Beekman
2020-02-15  7:26     ` Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 20/22] selftests/x86: Add vDSO selftest for SGX Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 21/22] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 22/22] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-02-22  4:13   ` Randy Dunlap
2020-02-23 17:04     ` Jarkko Sakkinen
2020-02-23 17:05       ` Jarkko Sakkinen

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