[v5] misc: Add Nitro Secure Module driver
Commit Message
When running Linux inside a Nitro Enclave, the hypervisor provides a
special virtio device called "Nitro Security Module" (NSM). This device
has 3 main functions:
1) Provide attestation reports
2) Modify PCR state
3) Provide entropy
This patch adds a driver for NSM that exposes a /dev/nsm device node which
user space can issue an ioctl on this device with raw NSM CBOR formatted
commands to request attestation documents, influence PCR states, read
entropy and enumerate status of the device. In addition, the driver
implements a hwrng backend.
Originally-by: Petre Eftime <petre.eftime@gmail.com>
Signed-off-by: Alexander Graf <graf@amazon.com>
---
v1 -> v2:
- Remove boilerplate
- Add uapi header
v2 -> v3:
- Move globals to device struct
- Add compat handling
- Simplify some naming
- Remove debug prints
- Use module_virtio_driver
- Drop use of uio.h
v3 -> v4:
- Merge hwrng into the misc driver
- Add dependency on CBOR library
- Add internal and ioctl logic for all current NSM actions
- Use in-struct arrays instead of kvecs
- Add sysfs entries for NSM metadata
- Use dev_ print and devm_ allocation helpers
v4 -> v5:
- Remove CBOR parsing and generation again
- Remove support for any non-raw ioctls
---
MAINTAINERS | 9 +
drivers/misc/Kconfig | 13 +
drivers/misc/Makefile | 1 +
drivers/misc/nsm.c | 576 +++++++++++++++++++++++++++++++++++++++
include/uapi/linux/nsm.h | 31 +++
5 files changed, 630 insertions(+)
create mode 100644 drivers/misc/nsm.c
create mode 100644 include/uapi/linux/nsm.h
Comments
Le 10/10/2023 à 21:18, Alexander Graf a écrit :
> When running Linux inside a Nitro Enclave, the hypervisor provides a
> special virtio device called "Nitro Security Module" (NSM). This device
> has 3 main functions:
>
> 1) Provide attestation reports
> 2) Modify PCR state
> 3) Provide entropy
>
> This patch adds a driver for NSM that exposes a /dev/nsm device node which
> user space can issue an ioctl on this device with raw NSM CBOR formatted
> commands to request attestation documents, influence PCR states, read
> entropy and enumerate status of the device. In addition, the driver
> implements a hwrng backend.
>
> Originally-by: Petre Eftime <petre.eftime@gmail.com>
> Signed-off-by: Alexander Graf <graf@amazon.com>
>
> ---
...
> +static int nsm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
> +{
> + struct nsm *nsm = hwrng_to_nsm(rng);
> + struct device *dev = &nsm->vdev->dev;
> + struct nsm_msg *msg;
> + int rc = 0;
> +
> + /* NSM always needs to wait for a response */
> + if (!wait)
> + return 0;
> +
> + msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
> + if (!msg)
> + return -ENOMEM;
Why use devm_ here? It is freed in all cases...
> +
> + rc = fill_req_get_random(nsm, &msg->req);
> + if (rc != 0)
> + goto out;
> +
> + rc = nsm_sendrecv_msg(nsm, msg);
> + if (rc != 0)
> + goto out;
> +
> + rc = parse_resp_get_random(nsm, &msg->resp, data, max);
> + if (rc < 0)
> + goto out;
> +
> + dev_dbg(dev, "RNG: returning rand bytes = %d", rc);
> +out:
> + devm_kfree(dev, msg);
..., so kfree would be just fine as well.
> + return rc;
> +}
> +
> +static long nsm_dev_ioctl(struct file *file, unsigned int cmd,
> + unsigned long arg)
> +{
> + void __user *argp = u64_to_user_ptr((u64)arg);
> + struct nsm *nsm = file_to_nsm(file);
> + struct device *dev = &nsm->vdev->dev;
> + struct nsm_msg *msg;
> + struct nsm_raw raw;
> + int r = 0;
> +
> + if (cmd != NSM_IOCTL_RAW)
> + return -EINVAL;
> +
> + if (_IOC_SIZE(cmd) != sizeof(raw))
> + return -EINVAL;
> +
> + /* Allocate message buffers to device */
> + r = -ENOMEM;
> + msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
Why use devm_ here? It is freed in all cases...
> + if (!msg)
> + goto out;
> +
> + /* Copy user argument struct to kernel argument struct */
> + r = -EFAULT;
> + if (copy_from_user(&raw, argp, _IOC_SIZE(cmd)))
> + goto out;
> +
> + /* Convert kernel argument struct to device request */
> + r = fill_req_raw(nsm, &msg->req, &raw);
> + if (r)
> + goto out;
> +
> + /* Send message to NSM and read reply */
> + r = nsm_sendrecv_msg(nsm, msg);
> + if (r)
> + goto out;
> +
> + /* Parse device response into kernel argument struct */
> + r = parse_resp_raw(nsm, &msg->resp, &raw);
> + if (r)
> + goto out;
> +
> + /* Copy kernel argument struct back to user argument struct */
> + r = -EFAULT;
> + if (copy_to_user(argp, &raw, sizeof(raw)))
> + goto out;
> +
> + r = 0;
> +
> +out:
> + devm_kfree(dev, msg);
..., so kfree would be just fine as well.
> + return r;
> +}
...
> +/* Handler for probing the NSM device */
> +static int nsm_device_probe(struct virtio_device *vdev)
> +{
> + struct device *dev = &vdev->dev;
> + struct nsm *nsm;
> + int rc;
> +
> + nsm = devm_kzalloc(&vdev->dev, sizeof(*nsm), GFP_KERNEL);
> + if (!nsm)
> + return -ENOMEM;
> +
> + vdev->priv = nsm;
> + nsm->vdev = vdev;
> +
> + rc = nsm_device_init_vq(vdev);
> + if (rc) {
> + dev_err(dev, "queue failed to initialize: %d.\n", rc);
> + goto err_init_vq;
> + }
> +
> + mutex_init(&nsm->lock);
> + init_waitqueue_head(&nsm->wq);
> +
> + /* Register as hwrng provider */
> + nsm->hwrng = (struct hwrng) {
> + .read = nsm_rng_read,
> + .name = "nsm-hwrng",
> + .quality = 1000,
> + };
> +
> + rc = devm_hwrng_register(&vdev->dev, &nsm->hwrng);
> + if (rc) {
> + dev_err(dev, "RNG initialization error: %d.\n", rc);
> + goto err_hwrng;
> + }
> +
> + /* Register /dev/nsm device node */
> + nsm->misc = (struct miscdevice) {
> + .minor = MISC_DYNAMIC_MINOR,
> + .name = "nsm",
> + .fops = &nsm_dev_fops,
> + .mode = 0666,
> + };
> +
> + rc = misc_register(&nsm->misc);
> + if (rc) {
> + dev_err(dev, "misc device registration error: %d.\n", rc);
> + goto err_misc;
> + }
> +
> + return 0;
> +
> +err_misc:
> + hwrng_unregister(&nsm->hwrng);
Is it needed? devm_hwrng_register() is used.
> +err_hwrng:
> + vdev->config->del_vqs(vdev);
> +err_init_vq:
> + kfree(nsm);
'nsm' is devm_kzalloc()'ed, so this is a double free.
> + return rc;
> +}
> +
> +/* Handler for removing the NSM device */
> +static void nsm_device_remove(struct virtio_device *vdev)
> +{
> + struct nsm *nsm = vdev->priv;
> +
> + hwrng_unregister(&nsm->hwrng);
Is it needed? devm_hwrng_register() is used.
> +
> + vdev->config->del_vqs(vdev);
> + misc_deregister(&nsm->misc);
> + list_del(&nsm->node);
When is it list_add()'ed?
The 'node' field seems unused.
CJ
> +}
...
On Tue, Oct 10, 2023 at 07:18:15PM +0000, Alexander Graf wrote:
> When running Linux inside a Nitro Enclave, the hypervisor provides a
> special virtio device called "Nitro Security Module" (NSM). This device
> has 3 main functions:
>
> 1) Provide attestation reports
> 2) Modify PCR state
> 3) Provide entropy
>
> This patch adds a driver for NSM that exposes a /dev/nsm device node which
> user space can issue an ioctl on this device with raw NSM CBOR formatted
> commands to request attestation documents, influence PCR states, read
> entropy and enumerate status of the device. In addition, the driver
> implements a hwrng backend.
>
> Originally-by: Petre Eftime <petre.eftime@gmail.com>
> Signed-off-by: Alexander Graf <graf@amazon.com>
Could some documentation about how this device works be posted on virtio
list please?
> ---
>
> v1 -> v2:
>
> - Remove boilerplate
> - Add uapi header
>
> v2 -> v3:
>
> - Move globals to device struct
> - Add compat handling
> - Simplify some naming
> - Remove debug prints
> - Use module_virtio_driver
> - Drop use of uio.h
>
> v3 -> v4:
>
> - Merge hwrng into the misc driver
> - Add dependency on CBOR library
> - Add internal and ioctl logic for all current NSM actions
> - Use in-struct arrays instead of kvecs
> - Add sysfs entries for NSM metadata
> - Use dev_ print and devm_ allocation helpers
>
> v4 -> v5:
>
> - Remove CBOR parsing and generation again
> - Remove support for any non-raw ioctls
> ---
> MAINTAINERS | 9 +
> drivers/misc/Kconfig | 13 +
> drivers/misc/Makefile | 1 +
> drivers/misc/nsm.c | 576 +++++++++++++++++++++++++++++++++++++++
> include/uapi/linux/nsm.h | 31 +++
> 5 files changed, 630 insertions(+)
> create mode 100644 drivers/misc/nsm.c
> create mode 100644 include/uapi/linux/nsm.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6c4cce45a09d..d7afb3dedbd2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15096,6 +15096,15 @@ F: include/linux/nitro_enclaves.h
> F: include/uapi/linux/nitro_enclaves.h
> F: samples/nitro_enclaves/
>
> +NITRO SECURE MODULE (NSM)
> +M: Alexander Graf <graf@amazon.com>
> +L: linux-kernel@vger.kernel.org
> +L: The AWS Nitro Enclaves Team <aws-nitro-enclaves-devel@amazon.com>
> +S: Supported
> +W: https://aws.amazon.com/ec2/nitro/nitro-enclaves/
> +F: drivers/misc/nsm.c
> +F: include/uapi/linux/nsm.h
> +
> NOHZ, DYNTICKS SUPPORT
> M: Frederic Weisbecker <frederic@kernel.org>
> M: Thomas Gleixner <tglx@linutronix.de>
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index cadd4a820c03..236f36a8e8d4 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -562,6 +562,19 @@ config TPS6594_PFSM
> This driver can also be built as a module. If so, the module
> will be called tps6594-pfsm.
>
> +config NSM
> + tristate "Nitro (Enclaves) Security Module support"
> + depends on VIRTIO
> + select HW_RANDOM
> + select CBOR
> + help
> + This driver provides support for the Nitro Security Module
> + in AWS EC2 Nitro based Enclaves. The driver exposes a /dev/nsm
> + device user space can use to communicate with the hypervisor.
> +
> + To compile this driver as a module, choose M here.
> + The module will be called nsm.
> +
> source "drivers/misc/c2port/Kconfig"
> source "drivers/misc/eeprom/Kconfig"
> source "drivers/misc/cb710/Kconfig"
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> index f2a4d1ff65d4..ea6ea5bbbc9c 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -67,3 +67,4 @@ obj-$(CONFIG_TMR_MANAGER) += xilinx_tmr_manager.o
> obj-$(CONFIG_TMR_INJECT) += xilinx_tmr_inject.o
> obj-$(CONFIG_TPS6594_ESM) += tps6594-esm.o
> obj-$(CONFIG_TPS6594_PFSM) += tps6594-pfsm.o
> +obj-$(CONFIG_NSM) += nsm.o
> diff --git a/drivers/misc/nsm.c b/drivers/misc/nsm.c
> new file mode 100644
> index 000000000000..7ead36ba412f
> --- /dev/null
> +++ b/drivers/misc/nsm.c
> @@ -0,0 +1,576 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Amazon Nitro Secure Module driver.
> + *
> + * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
> + *
> + * The Nitro Secure Module implements commands via CBOR over virtio.
> + * This driver exposes a raw message ioctls on /dev/nsm that user
> + * space can use to issue these commands.
> + */
> +
> +#include <linux/file.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/hw_random.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +#include <linux/uaccess.h>
> +#include <linux/uio.h>
> +#include <linux/virtio_config.h>
> +#include <linux/virtio_ids.h>
> +#include <linux/virtio.h>
> +#include <linux/wait.h>
> +#include <uapi/linux/nsm.h>
> +
> +/* Timeout for NSM virtqueue respose in milliseconds. */
> +#define NSM_DEFAULT_TIMEOUT_MSECS (120000) /* 2 minutes */
> +
> +struct nsm {
> + struct list_head node;
> + struct virtio_device *vdev;
> + struct virtqueue *vq;
> + struct mutex lock;
> + wait_queue_head_t wq;
> + bool device_notified;
> + struct miscdevice misc;
> + struct hwrng hwrng;
> + struct work_struct misc_init;
> +};
> +
> +/* NSM device ID */
> +static const struct virtio_device_id id_table[] = {
> + { VIRTIO_ID_NITRO_SEC_MOD, VIRTIO_DEV_ANY_ID },
> + { 0 },
> +};
> +
> +/* Maximum length input data */
> +struct nsm_data_req {
> + __u32 len;
> + __u8 data[NSM_REQUEST_MAX_SIZE];
> +};
> +
> +/* Maximum length output data */
> +struct nsm_data_resp {
> + __u32 len;
> + __u8 data[NSM_RESPONSE_MAX_SIZE];
> +};
> +
> +/* Full NSM request/response message */
> +struct nsm_msg {
> + struct nsm_data_req req;
> + struct nsm_data_resp resp;
> +};
> +
> +static inline struct nsm *file_to_nsm(struct file *file)
> +{
> + return container_of(file->private_data, struct nsm, misc);
> +}
> +
> +static inline struct nsm *hwrng_to_nsm(struct hwrng *rng)
> +{
> + return container_of(rng, struct nsm, hwrng);
> +}
> +
> +static inline struct nsm *misc_dev_to_nsm(struct miscdevice *misc)
> +{
> + return container_of(misc, struct nsm, misc);
> +}
> +
> +#define CBOR_TYPE_MASK 0xE0
> +#define CBOR_TYPE_MAP 0xA0
> +#define CBOR_TYPE_TEXT 0x60
> +#define CBOR_TYPE_ARRAY 0x40
> +#define CBOR_HEADER_SIZE_SHORT 1
> +
> +#define CBOR_SHORT_SIZE_MAX_VALUE 23
> +#define CBOR_LONG_SIZE_U8 24
> +#define CBOR_LONG_SIZE_U16 25
> +#define CBOR_LONG_SIZE_U32 26
> +#define CBOR_LONG_SIZE_U64 27
> +
> +#define CBOR_HEADER_SIZE_U8 (CBOR_HEADER_SIZE_SHORT + sizeof(u8))
> +#define CBOR_HEADER_SIZE_U16 (CBOR_HEADER_SIZE_SHORT + sizeof(u16))
> +#define CBOR_HEADER_SIZE_U32 (CBOR_HEADER_SIZE_SHORT + sizeof(u32))
> +#define CBOR_HEADER_SIZE_U64 (CBOR_HEADER_SIZE_SHORT + sizeof(u64))
> +
> +static bool cbor_object_is_array(const u8 *cbor_object, size_t cbor_object_size)
> +{
> + if (cbor_object_size == 0 || cbor_object == NULL)
> + return false;
> +
> + return (cbor_object[0] & CBOR_TYPE_MASK) == CBOR_TYPE_ARRAY;
> +}
> +
> +static int cbor_object_get_array(u8 *cbor_object, size_t cbor_object_size, u8 **cbor_array)
> +{
> + u8 cbor_short_size;
> + u64 array_len;
> + u64 array_offset;
> +
> + if (!cbor_object_is_array(cbor_object, cbor_object_size))
> + return -EFAULT;
> +
> + if (cbor_array == NULL)
> + return -EFAULT;
> +
> + cbor_short_size = (cbor_object[0] & 0x1F);
> +
> + /* Decoding byte array length */
> + /* In short field encoding, the object header is 1 byte long and
> + * contains the type on the 3 MSB and the length on the LSB.
> + * If the length in the LSB is larger than 23, then the object
> + * uses long field encoding, and will contain the length over the
> + * next bytes in the object, depending on the value:
> + * 24 is u8, 25 is u16, 26 is u32 and 27 is u64.
> + */
> + if (cbor_short_size <= CBOR_SHORT_SIZE_MAX_VALUE) {
> + /* short encoding */
> + array_len = cbor_short_size;
> + array_offset = CBOR_HEADER_SIZE_SHORT;
> + } else if (cbor_short_size == CBOR_LONG_SIZE_U8) {
> + if (cbor_object_size < CBOR_HEADER_SIZE_U8)
> + return -EFAULT;
> + /* 1 byte */
> + array_len = cbor_object[1];
> + array_offset = CBOR_HEADER_SIZE_U8;
> + } else if (cbor_short_size == CBOR_LONG_SIZE_U16) {
> + if (cbor_object_size < CBOR_HEADER_SIZE_U16)
> + return -EFAULT;
> + /* 2 bytes */
> + array_len = cbor_object[1] << 8 | cbor_object[2];
> + array_offset = CBOR_HEADER_SIZE_U16;
> + } else if (cbor_short_size == CBOR_LONG_SIZE_U32) {
> + if (cbor_object_size < CBOR_HEADER_SIZE_U32)
> + return -EFAULT;
> + /* 4 bytes */
> + array_len = cbor_object[1] << 24 |
> + cbor_object[2] << 16 |
> + cbor_object[3] << 8 |
> + cbor_object[4];
> + array_offset = CBOR_HEADER_SIZE_U32;
> + } else if (cbor_short_size == CBOR_LONG_SIZE_U64) {
> + if (cbor_object_size < CBOR_HEADER_SIZE_U64)
> + return -EFAULT;
> + /* 8 bytes */
> + array_len = (u64) cbor_object[1] << 56 |
> + (u64) cbor_object[2] << 48 |
> + (u64) cbor_object[3] << 40 |
> + (u64) cbor_object[4] << 32 |
> + (u64) cbor_object[5] << 24 |
> + (u64) cbor_object[6] << 16 |
> + (u64) cbor_object[7] << 8 |
> + (u64) cbor_object[8];
> + array_offset = CBOR_HEADER_SIZE_U64;
> + }
> +
> + if (cbor_object_size < array_offset)
> + return -EFAULT;
> +
> + if (cbor_object_size - array_offset < array_len)
> + return -EFAULT;
> +
> + if (array_len > INT_MAX)
> + return -EFAULT;
> +
> + *cbor_array = cbor_object + array_offset;
> + return array_len;
> +}
> +
> +/* Copy the request of a raw message to kernel space */
> +static int fill_req_raw(struct nsm *nsm, struct nsm_data_req *req,
> + struct nsm_raw *raw)
> +{
> + /* Verify the user input size. */
> + if (raw->request.len > sizeof(req->data))
> + return -EMSGSIZE;
> +
> + /* Copy the request payload */
> + if (copy_from_user(req->data, u64_to_user_ptr(raw->request.addr),
> + raw->request.len))
> + return -EFAULT;
> +
> + req->len = raw->request.len;
> +
> + return 0;
> +}
> +
> +/* Copy the response of a raw message back to user-space */
> +static int parse_resp_raw(struct nsm *nsm, struct nsm_data_resp *resp,
> + struct nsm_raw *raw)
> +{
> + /* Truncate any message that does not fit. */
> + raw->response.len = min_t(u64, raw->response.len, resp->len);
> +
> + /* Copy the response content to user space */
> + if (copy_to_user(u64_to_user_ptr(raw->response.addr),
> + resp->data, raw->response.len))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +/* Virtqueue interrupt handler */
> +static void nsm_vq_callback(struct virtqueue *vq)
> +{
> + struct nsm *nsm = vq->vdev->priv;
> +
> + nsm->device_notified = true;
> + wake_up(&nsm->wq);
> +}
> +
> +/* Forward a message to the NSM device and wait for the response from it */
> +static int nsm_sendrecv_msg(struct nsm *nsm, struct nsm_msg *msg)
> +{
> + struct device *dev = &nsm->vdev->dev;
> + struct scatterlist sg_in, sg_out;
> + struct virtqueue *vq = nsm->vq;
> + unsigned int len;
> + void *queue_buf;
> + bool kicked;
> + int rc;
> +
> + /* Initialize scatter-gather lists with request and response buffers. */
> + sg_init_one(&sg_out, msg->req.data, msg->req.len);
> + sg_init_one(&sg_in, msg->resp.data, sizeof(msg->resp.data));
> +
> + mutex_lock(&nsm->lock);
> +
> + /* Add the request buffer (read by the device). */
> + rc = virtqueue_add_outbuf(vq, &sg_out, 1, msg->req.data, GFP_KERNEL);
> + if (rc) {
> + mutex_unlock(&nsm->lock);
> + return rc;
> + }
> +
> + /* Add the response buffer (written by the device). */
> + rc = virtqueue_add_inbuf(vq, &sg_in, 1, msg->resp.data, GFP_KERNEL);
> + if (rc)
> + goto cleanup;
> +
> + nsm->device_notified = false;
> + kicked = virtqueue_kick(vq);
> + if (!kicked) {
> + /* Cannot kick the virtqueue. */
> + rc = -EIO;
> + goto cleanup;
> + }
> +
> + /* If the kick succeeded, wait for the device's response. */
> + rc = wait_event_timeout(nsm->wq,
> + nsm->device_notified == true,
> + msecs_to_jiffies(NSM_DEFAULT_TIMEOUT_MSECS));
> + if (!rc) {
> + rc = -ETIMEDOUT;
> + goto cleanup;
> + }
> +
> + queue_buf = virtqueue_get_buf(vq, &len);
> + if (!queue_buf || (queue_buf != msg->req.data)) {
> + dev_err(dev, "wrong request buffer.");
> + rc = -ENODATA;
> + goto cleanup;
> + }
> +
> + queue_buf = virtqueue_get_buf(vq, &len);
> + if (!queue_buf || (queue_buf != msg->resp.data)) {
> + dev_err(dev, "wrong response buffer.");
> + rc = -ENODATA;
> + goto cleanup;
> + }
> +
> + msg->resp.len = len;
> +
> + rc = 0;
> +
> +cleanup:
> + if (rc) {
> + /* Clean the virtqueue. */
> + while (virtqueue_get_buf(vq, &len) != NULL)
> + ;
> + }
> +
> + mutex_unlock(&nsm->lock);
> + return rc;
> +}
> +
> +static int fill_req_get_random(struct nsm *nsm, struct nsm_data_req *req)
> +{
> + /*
> + * 69 # text(9)
> + * 47657452616E646F6D # "GetRandom"
> + */
> + const u8 request[] = { CBOR_TYPE_TEXT + strlen("GetRandom"),
> + 'G', 'e', 't', 'R', 'a', 'n', 'd', 'o', 'm' };
> +
> + memcpy(req->data, request, sizeof(request));
> + req->len = sizeof(request);
> +
> + return 0;
> +}
> +
> +static int parse_resp_get_random(struct nsm *nsm, struct nsm_data_resp *resp,
> + void *out, size_t max)
> +{
> + /*
> + * A1 # map(1)
> + * 69 # text(9) - Name of field
> + * 47657452616E646F6D # "GetRandom"
> + * A1 # map(1) - The field itself
> + * 66 # text(6)
> + * 72616E646F6D # "random"
> + * # The rest of the response is random data
> + */
> + const u8 response[] = { CBOR_TYPE_MAP + 1,
> + CBOR_TYPE_TEXT + strlen("GetRandom"),
> + 'G', 'e', 't', 'R', 'a', 'n', 'd', 'o', 'm',
> + CBOR_TYPE_MAP + 1,
> + CBOR_TYPE_TEXT + strlen("random"),
> + 'r', 'a', 'n', 'd', 'o', 'm' };
> + struct device *dev = &nsm->vdev->dev;
> + u8 *rand_data = NULL;
> + u8 *resp_ptr = resp->data;
> + u64 resp_len = resp->len;
> + int rc;
> +
> + if ((resp->len < sizeof(response) + 1) ||
> + (memcmp(resp_ptr, response, sizeof(response)) != 0)) {
> + dev_err(dev, "Invalid response for GetRandom");
> + return -EFAULT;
> + }
> +
> + resp_ptr += sizeof(response);
> + resp_len -= sizeof(response);
> +
> + if (!cbor_object_is_array(resp_ptr, resp_len)) {
> + /* not a byte array */
> + dev_err(dev, "GetRandom: Not a byte array");
> + return -EFAULT;
> + }
> +
> + rc = cbor_object_get_array(resp_ptr, resp_len, &rand_data);
> + if (rc < 0) {
> + dev_err(dev, "GetRandom: Invalid CBOR encoding\n");
> + return rc;
> + }
> +
> + rc = min_t(size_t, rc, max);
> + memcpy(out, rand_data, rc);
> +
> + return rc;
> +}
> +
> +/*
> + * HwRNG implementation
> + */
> +static int nsm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
> +{
> + struct nsm *nsm = hwrng_to_nsm(rng);
> + struct device *dev = &nsm->vdev->dev;
> + struct nsm_msg *msg;
> + int rc = 0;
> +
> + /* NSM always needs to wait for a response */
> + if (!wait)
> + return 0;
> +
> + msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
> + if (!msg)
> + return -ENOMEM;
> +
> + rc = fill_req_get_random(nsm, &msg->req);
> + if (rc != 0)
> + goto out;
> +
> + rc = nsm_sendrecv_msg(nsm, msg);
> + if (rc != 0)
> + goto out;
> +
> + rc = parse_resp_get_random(nsm, &msg->resp, data, max);
> + if (rc < 0)
> + goto out;
> +
> + dev_dbg(dev, "RNG: returning rand bytes = %d", rc);
> +out:
> + devm_kfree(dev, msg);
> + return rc;
> +}
> +
> +static long nsm_dev_ioctl(struct file *file, unsigned int cmd,
> + unsigned long arg)
> +{
> + void __user *argp = u64_to_user_ptr((u64)arg);
> + struct nsm *nsm = file_to_nsm(file);
> + struct device *dev = &nsm->vdev->dev;
> + struct nsm_msg *msg;
> + struct nsm_raw raw;
> + int r = 0;
> +
> + if (cmd != NSM_IOCTL_RAW)
> + return -EINVAL;
> +
> + if (_IOC_SIZE(cmd) != sizeof(raw))
> + return -EINVAL;
> +
> + /* Allocate message buffers to device */
> + r = -ENOMEM;
> + msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
> + if (!msg)
> + goto out;
> +
> + /* Copy user argument struct to kernel argument struct */
> + r = -EFAULT;
> + if (copy_from_user(&raw, argp, _IOC_SIZE(cmd)))
> + goto out;
> +
> + /* Convert kernel argument struct to device request */
> + r = fill_req_raw(nsm, &msg->req, &raw);
> + if (r)
> + goto out;
> +
> + /* Send message to NSM and read reply */
> + r = nsm_sendrecv_msg(nsm, msg);
> + if (r)
> + goto out;
> +
> + /* Parse device response into kernel argument struct */
> + r = parse_resp_raw(nsm, &msg->resp, &raw);
> + if (r)
> + goto out;
> +
> + /* Copy kernel argument struct back to user argument struct */
> + r = -EFAULT;
> + if (copy_to_user(argp, &raw, sizeof(raw)))
> + goto out;
> +
> + r = 0;
> +
> +out:
> + devm_kfree(dev, msg);
> + return r;
> +}
> +
> +static int nsm_dev_file_open(struct inode *node, struct file *file)
> +{
> + return 0;
> +}
> +
> +static int nsm_dev_file_close(struct inode *inode, struct file *file)
> +{
> + return 0;
> +}
> +
> +static int nsm_device_init_vq(struct virtio_device *vdev)
> +{
> + struct virtqueue *vq = virtio_find_single_vq(vdev,
> + nsm_vq_callback, "nsm.vq.0");
> + struct nsm *nsm = vdev->priv;
> +
> + if (IS_ERR(vq))
> + return PTR_ERR(vq);
> +
> + nsm->vq = vq;
> +
> + return 0;
> +}
> +
> +static const struct file_operations nsm_dev_fops = {
> + .open = nsm_dev_file_open,
> + .release = nsm_dev_file_close,
> + .unlocked_ioctl = nsm_dev_ioctl,
> + .compat_ioctl = compat_ptr_ioctl,
> +};
> +
> +/* Handler for probing the NSM device */
> +static int nsm_device_probe(struct virtio_device *vdev)
> +{
> + struct device *dev = &vdev->dev;
> + struct nsm *nsm;
> + int rc;
> +
> + nsm = devm_kzalloc(&vdev->dev, sizeof(*nsm), GFP_KERNEL);
> + if (!nsm)
> + return -ENOMEM;
> +
> + vdev->priv = nsm;
> + nsm->vdev = vdev;
> +
> + rc = nsm_device_init_vq(vdev);
> + if (rc) {
> + dev_err(dev, "queue failed to initialize: %d.\n", rc);
> + goto err_init_vq;
> + }
> +
> + mutex_init(&nsm->lock);
> + init_waitqueue_head(&nsm->wq);
> +
> + /* Register as hwrng provider */
> + nsm->hwrng = (struct hwrng) {
> + .read = nsm_rng_read,
> + .name = "nsm-hwrng",
> + .quality = 1000,
> + };
> +
> + rc = devm_hwrng_register(&vdev->dev, &nsm->hwrng);
> + if (rc) {
> + dev_err(dev, "RNG initialization error: %d.\n", rc);
> + goto err_hwrng;
> + }
> +
> + /* Register /dev/nsm device node */
> + nsm->misc = (struct miscdevice) {
> + .minor = MISC_DYNAMIC_MINOR,
> + .name = "nsm",
> + .fops = &nsm_dev_fops,
> + .mode = 0666,
> + };
> +
> + rc = misc_register(&nsm->misc);
> + if (rc) {
> + dev_err(dev, "misc device registration error: %d.\n", rc);
> + goto err_misc;
> + }
> +
> + return 0;
> +
> +err_misc:
> + hwrng_unregister(&nsm->hwrng);
> +err_hwrng:
> + vdev->config->del_vqs(vdev);
> +err_init_vq:
> + kfree(nsm);
> + return rc;
> +}
> +
> +/* Handler for removing the NSM device */
> +static void nsm_device_remove(struct virtio_device *vdev)
> +{
> + struct nsm *nsm = vdev->priv;
> +
> + hwrng_unregister(&nsm->hwrng);
> +
> + vdev->config->del_vqs(vdev);
> + misc_deregister(&nsm->misc);
> + list_del(&nsm->node);
> +}
> +
> +/* NSM device configuration structure */
> +static struct virtio_driver virtio_nsm_driver = {
> + .feature_table = 0,
> + .feature_table_size = 0,
> + .feature_table_legacy = 0,
> + .feature_table_size_legacy = 0,
> + .driver.name = KBUILD_MODNAME,
> + .driver.owner = THIS_MODULE,
> + .id_table = id_table,
> + .probe = nsm_device_probe,
> + .remove = nsm_device_remove,
> +};
> +
> +module_virtio_driver(virtio_nsm_driver);
> +MODULE_DEVICE_TABLE(virtio, id_table);
> +MODULE_DESCRIPTION("Virtio NSM driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/uapi/linux/nsm.h b/include/uapi/linux/nsm.h
> new file mode 100644
> index 000000000000..e529f232f6c0
> --- /dev/null
> +++ b/include/uapi/linux/nsm.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
> + */
> +
> +#ifndef __UAPI_LINUX_NSM_H
> +#define __UAPI_LINUX_NSM_H
> +
> +#include <linux/ioctl.h>
> +#include <linux/types.h>
> +
> +#define NSM_MAGIC 0x0A
> +
> +#define NSM_REQUEST_MAX_SIZE 0x1000
> +#define NSM_RESPONSE_MAX_SIZE 0x3000
> +
> +struct nsm_iovec {
> + __u64 addr; /* Virtual address of target buffer */
> + __u64 len; /* Length of target buffer */
> +};
> +
> +/* Raw NSM message. Only available with CAP_SYS_ADMIN. */
> +struct nsm_raw {
> + /* Request from user */
> + struct nsm_iovec request;
> + /* Response to user */
> + struct nsm_iovec response;
> +};
> +#define NSM_IOCTL_RAW _IOWR(NSM_MAGIC, 0x0, struct nsm_raw)
> +
> +#endif /* __UAPI_LINUX_NSM_H */
> --
> 2.40.1
>
>
>
>
> Amazon Development Center Germany GmbH
> Krausenstr. 38
> 10117 Berlin
> Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
> Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
> Sitz: Berlin
> Ust-ID: DE 289 237 879
>
>
Hi Christophe,
Thanks a bunch for the review!
On 10.10.23 22:06, Christophe JAILLET wrote:
>
>
> Le 10/10/2023 à 21:18, Alexander Graf a écrit :
>> When running Linux inside a Nitro Enclave, the hypervisor provides a
>> special virtio device called "Nitro Security Module" (NSM). This device
>> has 3 main functions:
>>
>> 1) Provide attestation reports
>> 2) Modify PCR state
>> 3) Provide entropy
>>
>> This patch adds a driver for NSM that exposes a /dev/nsm device node
>> which
>> user space can issue an ioctl on this device with raw NSM CBOR formatted
>> commands to request attestation documents, influence PCR states, read
>> entropy and enumerate status of the device. In addition, the driver
>> implements a hwrng backend.
>>
>> Originally-by: Petre Eftime <petre.eftime@gmail.com>
>> Signed-off-by: Alexander Graf <graf@amazon.com>
>>
>> ---
>
> ...
>
>> +static int nsm_rng_read(struct hwrng *rng, void *data, size_t max,
>> bool wait)
>> +{
>> + struct nsm *nsm = hwrng_to_nsm(rng);
>> + struct device *dev = &nsm->vdev->dev;
>> + struct nsm_msg *msg;
>> + int rc = 0;
>> +
>> + /* NSM always needs to wait for a response */
>> + if (!wait)
>> + return 0;
>> +
>> + msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
>> + if (!msg)
>> + return -ENOMEM;
>
> Why use devm_ here? It is freed in all cases...
Yes, absolutely. Let me change that :)
>
>> +
>> + rc = fill_req_get_random(nsm, &msg->req);
>> + if (rc != 0)
>> + goto out;
>> +
>> + rc = nsm_sendrecv_msg(nsm, msg);
>> + if (rc != 0)
>> + goto out;
>> +
>> + rc = parse_resp_get_random(nsm, &msg->resp, data, max);
>> + if (rc < 0)
>> + goto out;
>> +
>> + dev_dbg(dev, "RNG: returning rand bytes = %d", rc);
>> +out:
>> + devm_kfree(dev, msg);
>
> ..., so kfree would be just fine as well.
>
>> + return rc;
>> +}
>> +
>> +static long nsm_dev_ioctl(struct file *file, unsigned int cmd,
>> + unsigned long arg)
>> +{
>> + void __user *argp = u64_to_user_ptr((u64)arg);
>> + struct nsm *nsm = file_to_nsm(file);
>> + struct device *dev = &nsm->vdev->dev;
>> + struct nsm_msg *msg;
>> + struct nsm_raw raw;
>> + int r = 0;
>> +
>> + if (cmd != NSM_IOCTL_RAW)
>> + return -EINVAL;
>> +
>> + if (_IOC_SIZE(cmd) != sizeof(raw))
>> + return -EINVAL;
>> +
>> + /* Allocate message buffers to device */
>> + r = -ENOMEM;
>> + msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
>
> Why use devm_ here? It is freed in all cases...
>
>> + if (!msg)
>> + goto out;
>> +
>> + /* Copy user argument struct to kernel argument struct */
>> + r = -EFAULT;
>> + if (copy_from_user(&raw, argp, _IOC_SIZE(cmd)))
>> + goto out;
>> +
>> + /* Convert kernel argument struct to device request */
>> + r = fill_req_raw(nsm, &msg->req, &raw);
>> + if (r)
>> + goto out;
>> +
>> + /* Send message to NSM and read reply */
>> + r = nsm_sendrecv_msg(nsm, msg);
>> + if (r)
>> + goto out;
>> +
>> + /* Parse device response into kernel argument struct */
>> + r = parse_resp_raw(nsm, &msg->resp, &raw);
>> + if (r)
>> + goto out;
>> +
>> + /* Copy kernel argument struct back to user argument struct */
>> + r = -EFAULT;
>> + if (copy_to_user(argp, &raw, sizeof(raw)))
>> + goto out;
>> +
>> + r = 0;
>> +
>> +out:
>> + devm_kfree(dev, msg);
>
> ..., so kfree would be just fine as well.
>
>> + return r;
>> +}
>
> ...
>
>> +/* Handler for probing the NSM device */
>> +static int nsm_device_probe(struct virtio_device *vdev)
>> +{
>> + struct device *dev = &vdev->dev;
>> + struct nsm *nsm;
>> + int rc;
>> +
>> + nsm = devm_kzalloc(&vdev->dev, sizeof(*nsm), GFP_KERNEL);
>> + if (!nsm)
>> + return -ENOMEM;
>> +
>> + vdev->priv = nsm;
>> + nsm->vdev = vdev;
>> +
>> + rc = nsm_device_init_vq(vdev);
>> + if (rc) {
>> + dev_err(dev, "queue failed to initialize: %d.\n", rc);
>> + goto err_init_vq;
>> + }
>> +
>> + mutex_init(&nsm->lock);
>> + init_waitqueue_head(&nsm->wq);
>> +
>> + /* Register as hwrng provider */
>> + nsm->hwrng = (struct hwrng) {
>> + .read = nsm_rng_read,
>> + .name = "nsm-hwrng",
>> + .quality = 1000,
>> + };
>> +
>> + rc = devm_hwrng_register(&vdev->dev, &nsm->hwrng);
>> + if (rc) {
>> + dev_err(dev, "RNG initialization error: %d.\n", rc);
>> + goto err_hwrng;
>> + }
>> +
>> + /* Register /dev/nsm device node */
>> + nsm->misc = (struct miscdevice) {
>> + .minor = MISC_DYNAMIC_MINOR,
>> + .name = "nsm",
>> + .fops = &nsm_dev_fops,
>> + .mode = 0666,
>> + };
>> +
>> + rc = misc_register(&nsm->misc);
>> + if (rc) {
>> + dev_err(dev, "misc device registration error: %d.\n", rc);
>> + goto err_misc;
>> + }
>> +
>> + return 0;
>> +
>> +err_misc:
>> + hwrng_unregister(&nsm->hwrng);
>
> Is it needed? devm_hwrng_register() is used.
I'm afraid I can't / shouldn't use devm_hwrng_register() here. I need to
clean up the vq pointer in the remove function which I think may race
during removal. I really don't want to have hwrng call the driver code
while we've already destroyed the vqs.
So I'll change it to non-devm calls.
>
>> +err_hwrng:
>> + vdev->config->del_vqs(vdev);
>> +err_init_vq:
>> + kfree(nsm);
>
> 'nsm' is devm_kzalloc()'ed, so this is a double free.
Thanks for catching this!
>
>> + return rc;
>> +}
>> +
>> +/* Handler for removing the NSM device */
>> +static void nsm_device_remove(struct virtio_device *vdev)
>> +{
>> + struct nsm *nsm = vdev->priv;
>> +
>> + hwrng_unregister(&nsm->hwrng);
>
> Is it needed? devm_hwrng_register() is used.
>
>> +
>> + vdev->config->del_vqs(vdev);
>> + misc_deregister(&nsm->misc);
>> + list_del(&nsm->node);
>
> When is it list_add()'ed?
> The 'node' field seems unused.
This is a leftover from old code, removed. Thanks for catching it!
Alex
Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879
On 10.10.23 22:34, Michael S. Tsirkin wrote:
>
> On Tue, Oct 10, 2023 at 07:18:15PM +0000, Alexander Graf wrote:
>> When running Linux inside a Nitro Enclave, the hypervisor provides a
>> special virtio device called "Nitro Security Module" (NSM). This device
>> has 3 main functions:
>>
>> 1) Provide attestation reports
>> 2) Modify PCR state
>> 3) Provide entropy
>>
>> This patch adds a driver for NSM that exposes a /dev/nsm device node which
>> user space can issue an ioctl on this device with raw NSM CBOR formatted
>> commands to request attestation documents, influence PCR states, read
>> entropy and enumerate status of the device. In addition, the driver
>> implements a hwrng backend.
>>
>> Originally-by: Petre Eftime <petre.eftime@gmail.com>
>> Signed-off-by: Alexander Graf <graf@amazon.com>
> Could some documentation about how this device works be posted on virtio
> list please?
Sure! What is your preferred method to provide this? :)
Alex
Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879
On Tue, Oct 10, 2023 at 11:29:00PM +0200, Alexander Graf wrote:
>
> On 10.10.23 22:34, Michael S. Tsirkin wrote:
> >
> > On Tue, Oct 10, 2023 at 07:18:15PM +0000, Alexander Graf wrote:
> > > When running Linux inside a Nitro Enclave, the hypervisor provides a
> > > special virtio device called "Nitro Security Module" (NSM). This device
> > > has 3 main functions:
> > >
> > > 1) Provide attestation reports
> > > 2) Modify PCR state
> > > 3) Provide entropy
> > >
> > > This patch adds a driver for NSM that exposes a /dev/nsm device node which
> > > user space can issue an ioctl on this device with raw NSM CBOR formatted
> > > commands to request attestation documents, influence PCR states, read
> > > entropy and enumerate status of the device. In addition, the driver
> > > implements a hwrng backend.
> > >
> > > Originally-by: Petre Eftime <petre.eftime@gmail.com>
> > > Signed-off-by: Alexander Graf <graf@amazon.com>
> > Could some documentation about how this device works be posted on virtio
> > list please?
>
>
> Sure! What is your preferred method to provide this? :)
>
> Alex
>
Posting patch adding a text file with it to virtio-comment would be best.
>
>
>
> Amazon Development Center Germany GmbH
> Krausenstr. 38
> 10117 Berlin
> Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
> Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
> Sitz: Berlin
> Ust-ID: DE 289 237 879
>
>
@@ -15096,6 +15096,15 @@ F: include/linux/nitro_enclaves.h
F: include/uapi/linux/nitro_enclaves.h
F: samples/nitro_enclaves/
+NITRO SECURE MODULE (NSM)
+M: Alexander Graf <graf@amazon.com>
+L: linux-kernel@vger.kernel.org
+L: The AWS Nitro Enclaves Team <aws-nitro-enclaves-devel@amazon.com>
+S: Supported
+W: https://aws.amazon.com/ec2/nitro/nitro-enclaves/
+F: drivers/misc/nsm.c
+F: include/uapi/linux/nsm.h
+
NOHZ, DYNTICKS SUPPORT
M: Frederic Weisbecker <frederic@kernel.org>
M: Thomas Gleixner <tglx@linutronix.de>
@@ -562,6 +562,19 @@ config TPS6594_PFSM
This driver can also be built as a module. If so, the module
will be called tps6594-pfsm.
+config NSM
+ tristate "Nitro (Enclaves) Security Module support"
+ depends on VIRTIO
+ select HW_RANDOM
+ select CBOR
+ help
+ This driver provides support for the Nitro Security Module
+ in AWS EC2 Nitro based Enclaves. The driver exposes a /dev/nsm
+ device user space can use to communicate with the hypervisor.
+
+ To compile this driver as a module, choose M here.
+ The module will be called nsm.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
@@ -67,3 +67,4 @@ obj-$(CONFIG_TMR_MANAGER) += xilinx_tmr_manager.o
obj-$(CONFIG_TMR_INJECT) += xilinx_tmr_inject.o
obj-$(CONFIG_TPS6594_ESM) += tps6594-esm.o
obj-$(CONFIG_TPS6594_PFSM) += tps6594-pfsm.o
+obj-$(CONFIG_NSM) += nsm.o
new file mode 100644
@@ -0,0 +1,576 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Amazon Nitro Secure Module driver.
+ *
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * The Nitro Secure Module implements commands via CBOR over virtio.
+ * This driver exposes a raw message ioctls on /dev/nsm that user
+ * space can use to issue these commands.
+ */
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/hw_random.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/uio.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio.h>
+#include <linux/wait.h>
+#include <uapi/linux/nsm.h>
+
+/* Timeout for NSM virtqueue respose in milliseconds. */
+#define NSM_DEFAULT_TIMEOUT_MSECS (120000) /* 2 minutes */
+
+struct nsm {
+ struct list_head node;
+ struct virtio_device *vdev;
+ struct virtqueue *vq;
+ struct mutex lock;
+ wait_queue_head_t wq;
+ bool device_notified;
+ struct miscdevice misc;
+ struct hwrng hwrng;
+ struct work_struct misc_init;
+};
+
+/* NSM device ID */
+static const struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_NITRO_SEC_MOD, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+/* Maximum length input data */
+struct nsm_data_req {
+ __u32 len;
+ __u8 data[NSM_REQUEST_MAX_SIZE];
+};
+
+/* Maximum length output data */
+struct nsm_data_resp {
+ __u32 len;
+ __u8 data[NSM_RESPONSE_MAX_SIZE];
+};
+
+/* Full NSM request/response message */
+struct nsm_msg {
+ struct nsm_data_req req;
+ struct nsm_data_resp resp;
+};
+
+static inline struct nsm *file_to_nsm(struct file *file)
+{
+ return container_of(file->private_data, struct nsm, misc);
+}
+
+static inline struct nsm *hwrng_to_nsm(struct hwrng *rng)
+{
+ return container_of(rng, struct nsm, hwrng);
+}
+
+static inline struct nsm *misc_dev_to_nsm(struct miscdevice *misc)
+{
+ return container_of(misc, struct nsm, misc);
+}
+
+#define CBOR_TYPE_MASK 0xE0
+#define CBOR_TYPE_MAP 0xA0
+#define CBOR_TYPE_TEXT 0x60
+#define CBOR_TYPE_ARRAY 0x40
+#define CBOR_HEADER_SIZE_SHORT 1
+
+#define CBOR_SHORT_SIZE_MAX_VALUE 23
+#define CBOR_LONG_SIZE_U8 24
+#define CBOR_LONG_SIZE_U16 25
+#define CBOR_LONG_SIZE_U32 26
+#define CBOR_LONG_SIZE_U64 27
+
+#define CBOR_HEADER_SIZE_U8 (CBOR_HEADER_SIZE_SHORT + sizeof(u8))
+#define CBOR_HEADER_SIZE_U16 (CBOR_HEADER_SIZE_SHORT + sizeof(u16))
+#define CBOR_HEADER_SIZE_U32 (CBOR_HEADER_SIZE_SHORT + sizeof(u32))
+#define CBOR_HEADER_SIZE_U64 (CBOR_HEADER_SIZE_SHORT + sizeof(u64))
+
+static bool cbor_object_is_array(const u8 *cbor_object, size_t cbor_object_size)
+{
+ if (cbor_object_size == 0 || cbor_object == NULL)
+ return false;
+
+ return (cbor_object[0] & CBOR_TYPE_MASK) == CBOR_TYPE_ARRAY;
+}
+
+static int cbor_object_get_array(u8 *cbor_object, size_t cbor_object_size, u8 **cbor_array)
+{
+ u8 cbor_short_size;
+ u64 array_len;
+ u64 array_offset;
+
+ if (!cbor_object_is_array(cbor_object, cbor_object_size))
+ return -EFAULT;
+
+ if (cbor_array == NULL)
+ return -EFAULT;
+
+ cbor_short_size = (cbor_object[0] & 0x1F);
+
+ /* Decoding byte array length */
+ /* In short field encoding, the object header is 1 byte long and
+ * contains the type on the 3 MSB and the length on the LSB.
+ * If the length in the LSB is larger than 23, then the object
+ * uses long field encoding, and will contain the length over the
+ * next bytes in the object, depending on the value:
+ * 24 is u8, 25 is u16, 26 is u32 and 27 is u64.
+ */
+ if (cbor_short_size <= CBOR_SHORT_SIZE_MAX_VALUE) {
+ /* short encoding */
+ array_len = cbor_short_size;
+ array_offset = CBOR_HEADER_SIZE_SHORT;
+ } else if (cbor_short_size == CBOR_LONG_SIZE_U8) {
+ if (cbor_object_size < CBOR_HEADER_SIZE_U8)
+ return -EFAULT;
+ /* 1 byte */
+ array_len = cbor_object[1];
+ array_offset = CBOR_HEADER_SIZE_U8;
+ } else if (cbor_short_size == CBOR_LONG_SIZE_U16) {
+ if (cbor_object_size < CBOR_HEADER_SIZE_U16)
+ return -EFAULT;
+ /* 2 bytes */
+ array_len = cbor_object[1] << 8 | cbor_object[2];
+ array_offset = CBOR_HEADER_SIZE_U16;
+ } else if (cbor_short_size == CBOR_LONG_SIZE_U32) {
+ if (cbor_object_size < CBOR_HEADER_SIZE_U32)
+ return -EFAULT;
+ /* 4 bytes */
+ array_len = cbor_object[1] << 24 |
+ cbor_object[2] << 16 |
+ cbor_object[3] << 8 |
+ cbor_object[4];
+ array_offset = CBOR_HEADER_SIZE_U32;
+ } else if (cbor_short_size == CBOR_LONG_SIZE_U64) {
+ if (cbor_object_size < CBOR_HEADER_SIZE_U64)
+ return -EFAULT;
+ /* 8 bytes */
+ array_len = (u64) cbor_object[1] << 56 |
+ (u64) cbor_object[2] << 48 |
+ (u64) cbor_object[3] << 40 |
+ (u64) cbor_object[4] << 32 |
+ (u64) cbor_object[5] << 24 |
+ (u64) cbor_object[6] << 16 |
+ (u64) cbor_object[7] << 8 |
+ (u64) cbor_object[8];
+ array_offset = CBOR_HEADER_SIZE_U64;
+ }
+
+ if (cbor_object_size < array_offset)
+ return -EFAULT;
+
+ if (cbor_object_size - array_offset < array_len)
+ return -EFAULT;
+
+ if (array_len > INT_MAX)
+ return -EFAULT;
+
+ *cbor_array = cbor_object + array_offset;
+ return array_len;
+}
+
+/* Copy the request of a raw message to kernel space */
+static int fill_req_raw(struct nsm *nsm, struct nsm_data_req *req,
+ struct nsm_raw *raw)
+{
+ /* Verify the user input size. */
+ if (raw->request.len > sizeof(req->data))
+ return -EMSGSIZE;
+
+ /* Copy the request payload */
+ if (copy_from_user(req->data, u64_to_user_ptr(raw->request.addr),
+ raw->request.len))
+ return -EFAULT;
+
+ req->len = raw->request.len;
+
+ return 0;
+}
+
+/* Copy the response of a raw message back to user-space */
+static int parse_resp_raw(struct nsm *nsm, struct nsm_data_resp *resp,
+ struct nsm_raw *raw)
+{
+ /* Truncate any message that does not fit. */
+ raw->response.len = min_t(u64, raw->response.len, resp->len);
+
+ /* Copy the response content to user space */
+ if (copy_to_user(u64_to_user_ptr(raw->response.addr),
+ resp->data, raw->response.len))
+ return -EFAULT;
+
+ return 0;
+}
+
+/* Virtqueue interrupt handler */
+static void nsm_vq_callback(struct virtqueue *vq)
+{
+ struct nsm *nsm = vq->vdev->priv;
+
+ nsm->device_notified = true;
+ wake_up(&nsm->wq);
+}
+
+/* Forward a message to the NSM device and wait for the response from it */
+static int nsm_sendrecv_msg(struct nsm *nsm, struct nsm_msg *msg)
+{
+ struct device *dev = &nsm->vdev->dev;
+ struct scatterlist sg_in, sg_out;
+ struct virtqueue *vq = nsm->vq;
+ unsigned int len;
+ void *queue_buf;
+ bool kicked;
+ int rc;
+
+ /* Initialize scatter-gather lists with request and response buffers. */
+ sg_init_one(&sg_out, msg->req.data, msg->req.len);
+ sg_init_one(&sg_in, msg->resp.data, sizeof(msg->resp.data));
+
+ mutex_lock(&nsm->lock);
+
+ /* Add the request buffer (read by the device). */
+ rc = virtqueue_add_outbuf(vq, &sg_out, 1, msg->req.data, GFP_KERNEL);
+ if (rc) {
+ mutex_unlock(&nsm->lock);
+ return rc;
+ }
+
+ /* Add the response buffer (written by the device). */
+ rc = virtqueue_add_inbuf(vq, &sg_in, 1, msg->resp.data, GFP_KERNEL);
+ if (rc)
+ goto cleanup;
+
+ nsm->device_notified = false;
+ kicked = virtqueue_kick(vq);
+ if (!kicked) {
+ /* Cannot kick the virtqueue. */
+ rc = -EIO;
+ goto cleanup;
+ }
+
+ /* If the kick succeeded, wait for the device's response. */
+ rc = wait_event_timeout(nsm->wq,
+ nsm->device_notified == true,
+ msecs_to_jiffies(NSM_DEFAULT_TIMEOUT_MSECS));
+ if (!rc) {
+ rc = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ queue_buf = virtqueue_get_buf(vq, &len);
+ if (!queue_buf || (queue_buf != msg->req.data)) {
+ dev_err(dev, "wrong request buffer.");
+ rc = -ENODATA;
+ goto cleanup;
+ }
+
+ queue_buf = virtqueue_get_buf(vq, &len);
+ if (!queue_buf || (queue_buf != msg->resp.data)) {
+ dev_err(dev, "wrong response buffer.");
+ rc = -ENODATA;
+ goto cleanup;
+ }
+
+ msg->resp.len = len;
+
+ rc = 0;
+
+cleanup:
+ if (rc) {
+ /* Clean the virtqueue. */
+ while (virtqueue_get_buf(vq, &len) != NULL)
+ ;
+ }
+
+ mutex_unlock(&nsm->lock);
+ return rc;
+}
+
+static int fill_req_get_random(struct nsm *nsm, struct nsm_data_req *req)
+{
+ /*
+ * 69 # text(9)
+ * 47657452616E646F6D # "GetRandom"
+ */
+ const u8 request[] = { CBOR_TYPE_TEXT + strlen("GetRandom"),
+ 'G', 'e', 't', 'R', 'a', 'n', 'd', 'o', 'm' };
+
+ memcpy(req->data, request, sizeof(request));
+ req->len = sizeof(request);
+
+ return 0;
+}
+
+static int parse_resp_get_random(struct nsm *nsm, struct nsm_data_resp *resp,
+ void *out, size_t max)
+{
+ /*
+ * A1 # map(1)
+ * 69 # text(9) - Name of field
+ * 47657452616E646F6D # "GetRandom"
+ * A1 # map(1) - The field itself
+ * 66 # text(6)
+ * 72616E646F6D # "random"
+ * # The rest of the response is random data
+ */
+ const u8 response[] = { CBOR_TYPE_MAP + 1,
+ CBOR_TYPE_TEXT + strlen("GetRandom"),
+ 'G', 'e', 't', 'R', 'a', 'n', 'd', 'o', 'm',
+ CBOR_TYPE_MAP + 1,
+ CBOR_TYPE_TEXT + strlen("random"),
+ 'r', 'a', 'n', 'd', 'o', 'm' };
+ struct device *dev = &nsm->vdev->dev;
+ u8 *rand_data = NULL;
+ u8 *resp_ptr = resp->data;
+ u64 resp_len = resp->len;
+ int rc;
+
+ if ((resp->len < sizeof(response) + 1) ||
+ (memcmp(resp_ptr, response, sizeof(response)) != 0)) {
+ dev_err(dev, "Invalid response for GetRandom");
+ return -EFAULT;
+ }
+
+ resp_ptr += sizeof(response);
+ resp_len -= sizeof(response);
+
+ if (!cbor_object_is_array(resp_ptr, resp_len)) {
+ /* not a byte array */
+ dev_err(dev, "GetRandom: Not a byte array");
+ return -EFAULT;
+ }
+
+ rc = cbor_object_get_array(resp_ptr, resp_len, &rand_data);
+ if (rc < 0) {
+ dev_err(dev, "GetRandom: Invalid CBOR encoding\n");
+ return rc;
+ }
+
+ rc = min_t(size_t, rc, max);
+ memcpy(out, rand_data, rc);
+
+ return rc;
+}
+
+/*
+ * HwRNG implementation
+ */
+static int nsm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+ struct nsm *nsm = hwrng_to_nsm(rng);
+ struct device *dev = &nsm->vdev->dev;
+ struct nsm_msg *msg;
+ int rc = 0;
+
+ /* NSM always needs to wait for a response */
+ if (!wait)
+ return 0;
+
+ msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ rc = fill_req_get_random(nsm, &msg->req);
+ if (rc != 0)
+ goto out;
+
+ rc = nsm_sendrecv_msg(nsm, msg);
+ if (rc != 0)
+ goto out;
+
+ rc = parse_resp_get_random(nsm, &msg->resp, data, max);
+ if (rc < 0)
+ goto out;
+
+ dev_dbg(dev, "RNG: returning rand bytes = %d", rc);
+out:
+ devm_kfree(dev, msg);
+ return rc;
+}
+
+static long nsm_dev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = u64_to_user_ptr((u64)arg);
+ struct nsm *nsm = file_to_nsm(file);
+ struct device *dev = &nsm->vdev->dev;
+ struct nsm_msg *msg;
+ struct nsm_raw raw;
+ int r = 0;
+
+ if (cmd != NSM_IOCTL_RAW)
+ return -EINVAL;
+
+ if (_IOC_SIZE(cmd) != sizeof(raw))
+ return -EINVAL;
+
+ /* Allocate message buffers to device */
+ r = -ENOMEM;
+ msg = devm_kzalloc(dev, sizeof(*msg), GFP_KERNEL);
+ if (!msg)
+ goto out;
+
+ /* Copy user argument struct to kernel argument struct */
+ r = -EFAULT;
+ if (copy_from_user(&raw, argp, _IOC_SIZE(cmd)))
+ goto out;
+
+ /* Convert kernel argument struct to device request */
+ r = fill_req_raw(nsm, &msg->req, &raw);
+ if (r)
+ goto out;
+
+ /* Send message to NSM and read reply */
+ r = nsm_sendrecv_msg(nsm, msg);
+ if (r)
+ goto out;
+
+ /* Parse device response into kernel argument struct */
+ r = parse_resp_raw(nsm, &msg->resp, &raw);
+ if (r)
+ goto out;
+
+ /* Copy kernel argument struct back to user argument struct */
+ r = -EFAULT;
+ if (copy_to_user(argp, &raw, sizeof(raw)))
+ goto out;
+
+ r = 0;
+
+out:
+ devm_kfree(dev, msg);
+ return r;
+}
+
+static int nsm_dev_file_open(struct inode *node, struct file *file)
+{
+ return 0;
+}
+
+static int nsm_dev_file_close(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static int nsm_device_init_vq(struct virtio_device *vdev)
+{
+ struct virtqueue *vq = virtio_find_single_vq(vdev,
+ nsm_vq_callback, "nsm.vq.0");
+ struct nsm *nsm = vdev->priv;
+
+ if (IS_ERR(vq))
+ return PTR_ERR(vq);
+
+ nsm->vq = vq;
+
+ return 0;
+}
+
+static const struct file_operations nsm_dev_fops = {
+ .open = nsm_dev_file_open,
+ .release = nsm_dev_file_close,
+ .unlocked_ioctl = nsm_dev_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+};
+
+/* Handler for probing the NSM device */
+static int nsm_device_probe(struct virtio_device *vdev)
+{
+ struct device *dev = &vdev->dev;
+ struct nsm *nsm;
+ int rc;
+
+ nsm = devm_kzalloc(&vdev->dev, sizeof(*nsm), GFP_KERNEL);
+ if (!nsm)
+ return -ENOMEM;
+
+ vdev->priv = nsm;
+ nsm->vdev = vdev;
+
+ rc = nsm_device_init_vq(vdev);
+ if (rc) {
+ dev_err(dev, "queue failed to initialize: %d.\n", rc);
+ goto err_init_vq;
+ }
+
+ mutex_init(&nsm->lock);
+ init_waitqueue_head(&nsm->wq);
+
+ /* Register as hwrng provider */
+ nsm->hwrng = (struct hwrng) {
+ .read = nsm_rng_read,
+ .name = "nsm-hwrng",
+ .quality = 1000,
+ };
+
+ rc = devm_hwrng_register(&vdev->dev, &nsm->hwrng);
+ if (rc) {
+ dev_err(dev, "RNG initialization error: %d.\n", rc);
+ goto err_hwrng;
+ }
+
+ /* Register /dev/nsm device node */
+ nsm->misc = (struct miscdevice) {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "nsm",
+ .fops = &nsm_dev_fops,
+ .mode = 0666,
+ };
+
+ rc = misc_register(&nsm->misc);
+ if (rc) {
+ dev_err(dev, "misc device registration error: %d.\n", rc);
+ goto err_misc;
+ }
+
+ return 0;
+
+err_misc:
+ hwrng_unregister(&nsm->hwrng);
+err_hwrng:
+ vdev->config->del_vqs(vdev);
+err_init_vq:
+ kfree(nsm);
+ return rc;
+}
+
+/* Handler for removing the NSM device */
+static void nsm_device_remove(struct virtio_device *vdev)
+{
+ struct nsm *nsm = vdev->priv;
+
+ hwrng_unregister(&nsm->hwrng);
+
+ vdev->config->del_vqs(vdev);
+ misc_deregister(&nsm->misc);
+ list_del(&nsm->node);
+}
+
+/* NSM device configuration structure */
+static struct virtio_driver virtio_nsm_driver = {
+ .feature_table = 0,
+ .feature_table_size = 0,
+ .feature_table_legacy = 0,
+ .feature_table_size_legacy = 0,
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = nsm_device_probe,
+ .remove = nsm_device_remove,
+};
+
+module_virtio_driver(virtio_nsm_driver);
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio NSM driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+
+#ifndef __UAPI_LINUX_NSM_H
+#define __UAPI_LINUX_NSM_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#define NSM_MAGIC 0x0A
+
+#define NSM_REQUEST_MAX_SIZE 0x1000
+#define NSM_RESPONSE_MAX_SIZE 0x3000
+
+struct nsm_iovec {
+ __u64 addr; /* Virtual address of target buffer */
+ __u64 len; /* Length of target buffer */
+};
+
+/* Raw NSM message. Only available with CAP_SYS_ADMIN. */
+struct nsm_raw {
+ /* Request from user */
+ struct nsm_iovec request;
+ /* Response to user */
+ struct nsm_iovec response;
+};
+#define NSM_IOCTL_RAW _IOWR(NSM_MAGIC, 0x0, struct nsm_raw)
+
+#endif /* __UAPI_LINUX_NSM_H */