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mvebu drivers for 5.9 (part 1)
For firmware on the Turris MOX (Armada 3720 based board), add support ECDSA signatures via debugfs. -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQQYqXDMF3cvSLY+g9cLBhiOFHI71QUCXxqgnwAKCRALBhiOFHI7 1aROAJ9xw1KBR6g4InE5NvO3yHy29L12SgCeM0klcfvENUGuhW8pntmqY5c3Zu8= =4riI -----END PGP SIGNATURE----- Merge tag 'mvebu-drivers-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/gclement/mvebu into arm/drivers mvebu drivers for 5.9 (part 1) For firmware on the Turris MOX (Armada 3720 based board), add support ECDSA signatures via debugfs. * tag 'mvebu-drivers-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/gclement/mvebu: firmware: turris-mox-rwtm: add debugfs documentation firmware: turris-mox-rwtm: support ECDSA signatures via debugfs Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
commit
1d4eadaf17
9
Documentation/ABI/testing/debugfs-turris-mox-rwtm
Normal file
9
Documentation/ABI/testing/debugfs-turris-mox-rwtm
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@ -0,0 +1,9 @@
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What: /sys/kernel/debug/turris-mox-rwtm/do_sign
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Date: Jun 2020
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KernelVersion: 5.8
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Contact: Marek Behún <marek.behun@nic.cz>
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Description: (W) Message to sign with the ECDSA private key stored in
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device's OTP. The message must be exactly 64 bytes (since
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this is intended for SHA-512 hashes).
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(R) The resulting signature, 136 bytes. This contains the R and
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S values of the ECDSA signature, both in big-endian format.
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@ -7,6 +7,7 @@
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#include <linux/armada-37xx-rwtm-mailbox.h>
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#include <linux/completion.h>
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#include <linux/debugfs.h>
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#include <linux/dma-mapping.h>
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#include <linux/hw_random.h>
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#include <linux/mailbox_client.h>
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@ -69,6 +70,18 @@ struct mox_rwtm {
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/* public key burned in eFuse */
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int has_pubkey;
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u8 pubkey[135];
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#ifdef CONFIG_DEBUG_FS
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/*
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* Signature process. This is currently done via debugfs, because it
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* does not conform to the sysfs standard "one file per attribute".
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* It should be rewritten via crypto API once akcipher API is available
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* from userspace.
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*/
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struct dentry *debugfs_root;
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u32 last_sig[34];
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int last_sig_done;
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#endif
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};
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struct mox_kobject {
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@ -279,6 +292,152 @@ unlock_mutex:
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return ret;
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}
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#ifdef CONFIG_DEBUG_FS
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static int rwtm_debug_open(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return nonseekable_open(inode, file);
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}
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static ssize_t do_sign_read(struct file *file, char __user *buf, size_t len,
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loff_t *ppos)
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{
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struct mox_rwtm *rwtm = file->private_data;
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ssize_t ret;
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/* only allow one read, of 136 bytes, from position 0 */
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if (*ppos != 0)
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return 0;
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if (len < 136)
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return -EINVAL;
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if (!rwtm->last_sig_done)
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return -ENODATA;
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/* 2 arrays of 17 32-bit words are 136 bytes */
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ret = simple_read_from_buffer(buf, len, ppos, rwtm->last_sig, 136);
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rwtm->last_sig_done = 0;
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return ret;
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}
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static ssize_t do_sign_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct mox_rwtm *rwtm = file->private_data;
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struct armada_37xx_rwtm_rx_msg *reply = &rwtm->reply;
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struct armada_37xx_rwtm_tx_msg msg;
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loff_t dummy = 0;
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ssize_t ret;
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/* the input is a SHA-512 hash, so exactly 64 bytes have to be read */
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if (len != 64)
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return -EINVAL;
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/* if last result is not zero user has not read that information yet */
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if (rwtm->last_sig_done)
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return -EBUSY;
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if (!mutex_trylock(&rwtm->busy))
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return -EBUSY;
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/*
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* Here we have to send:
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* 1. Address of the input to sign.
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* The input is an array of 17 32-bit words, the first (most
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* significat) is 0, the rest 16 words are copied from the SHA-512
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* hash given by the user and converted from BE to LE.
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* 2. Address of the buffer where ECDSA signature value R shall be
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* stored by the rWTM firmware.
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* 3. Address of the buffer where ECDSA signature value S shall be
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* stored by the rWTM firmware.
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*/
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memset(rwtm->buf, 0, 4);
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ret = simple_write_to_buffer(rwtm->buf + 4, 64, &dummy, buf, len);
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if (ret < 0)
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goto unlock_mutex;
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be32_to_cpu_array(rwtm->buf, rwtm->buf, 17);
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msg.command = MBOX_CMD_SIGN;
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msg.args[0] = 1;
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msg.args[1] = rwtm->buf_phys;
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msg.args[2] = rwtm->buf_phys + 68;
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msg.args[3] = rwtm->buf_phys + 2 * 68;
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ret = mbox_send_message(rwtm->mbox, &msg);
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if (ret < 0)
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goto unlock_mutex;
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ret = wait_for_completion_interruptible(&rwtm->cmd_done);
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if (ret < 0)
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goto unlock_mutex;
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ret = MBOX_STS_VALUE(reply->retval);
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if (MBOX_STS_ERROR(reply->retval) != MBOX_STS_SUCCESS)
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goto unlock_mutex;
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/*
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* Here we read the R and S values of the ECDSA signature
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* computed by the rWTM firmware and convert their words from
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* LE to BE.
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*/
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memcpy(rwtm->last_sig, rwtm->buf + 68, 136);
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cpu_to_be32_array(rwtm->last_sig, rwtm->last_sig, 34);
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rwtm->last_sig_done = 1;
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mutex_unlock(&rwtm->busy);
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return len;
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unlock_mutex:
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mutex_unlock(&rwtm->busy);
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return ret;
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}
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static const struct file_operations do_sign_fops = {
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.owner = THIS_MODULE,
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.open = rwtm_debug_open,
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.read = do_sign_read,
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.write = do_sign_write,
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.llseek = no_llseek,
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};
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static int rwtm_register_debugfs(struct mox_rwtm *rwtm)
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{
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struct dentry *root, *entry;
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root = debugfs_create_dir("turris-mox-rwtm", NULL);
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if (IS_ERR(root))
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return PTR_ERR(root);
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entry = debugfs_create_file_unsafe("do_sign", 0600, root, rwtm,
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&do_sign_fops);
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if (IS_ERR(entry))
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goto err_remove;
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rwtm->debugfs_root = root;
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return 0;
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err_remove:
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debugfs_remove_recursive(root);
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return PTR_ERR(entry);
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}
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static void rwtm_unregister_debugfs(struct mox_rwtm *rwtm)
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{
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debugfs_remove_recursive(rwtm->debugfs_root);
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}
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#else
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static inline int rwtm_register_debugfs(struct mox_rwtm *rwtm)
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{
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return 0;
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}
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static inline void rwtm_unregister_debugfs(struct mox_rwtm *rwtm)
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{
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}
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#endif
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static int turris_mox_rwtm_probe(struct platform_device *pdev)
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{
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struct mox_rwtm *rwtm;
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@ -340,6 +499,12 @@ static int turris_mox_rwtm_probe(struct platform_device *pdev)
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goto free_channel;
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}
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ret = rwtm_register_debugfs(rwtm);
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if (ret < 0) {
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dev_err(dev, "Failed creating debugfs entries: %i\n", ret);
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goto free_channel;
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}
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return 0;
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free_channel:
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@ -355,6 +520,7 @@ static int turris_mox_rwtm_remove(struct platform_device *pdev)
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{
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struct mox_rwtm *rwtm = platform_get_drvdata(pdev);
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rwtm_unregister_debugfs(rwtm);
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sysfs_remove_files(rwtm_to_kobj(rwtm), mox_rwtm_attrs);
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kobject_put(rwtm_to_kobj(rwtm));
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mbox_free_channel(rwtm->mbox);
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