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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2020 Intel Corporation <www.intel.com>
- *
- */
- #include <asm/arch/mailbox_s10.h>
- #include <asm/arch/secure_vab.h>
- #include <asm/arch/smc_api.h>
- #include <asm/unaligned.h>
- #include <common.h>
- #include <exports.h>
- #include <linux/errno.h>
- #include <linux/intel-smc.h>
- #include <log.h>
- #define CHUNKSZ_PER_WD_RESET (256 * SZ_1K)
- /*
- * Read the length of the VAB certificate from the end of image
- * and calculate the actual image size (excluding the VAB certificate).
- */
- static size_t get_img_size(u8 *img_buf, size_t img_buf_sz)
- {
- u8 *img_buf_end = img_buf + img_buf_sz;
- u32 cert_sz = get_unaligned_le32(img_buf_end - sizeof(u32));
- u8 *p = img_buf_end - cert_sz - sizeof(u32);
- /* Ensure p is pointing within the img_buf */
- if (p < img_buf || p > (img_buf_end - VAB_CERT_HEADER_SIZE))
- return 0;
- if (get_unaligned_le32(p) == SDM_CERT_MAGIC_NUM)
- return (size_t)(p - img_buf);
- return 0;
- }
- /*
- * Vendor Authorized Boot (VAB) is a security feature for authenticating
- * the images such as U-Boot, ARM trusted Firmware, Linux kernel,
- * device tree blob and etc loaded from FIT. User can also trigger
- * the VAB authentication from U-Boot command.
- *
- * This function extracts the VAB certificate and signature block
- * appended at the end of the image, then send to Secure Device Manager
- * (SDM) for authentication. This function will validate the SHA384
- * of the image against the SHA384 hash stored in the VAB certificate
- * before sending the VAB certificate to SDM for authentication.
- *
- * RETURN
- * 0 if authentication success or
- * if authentication is not required and bypassed on a non-secure device
- * negative error code if authentication fail
- */
- int socfpga_vendor_authentication(void **p_image, size_t *p_size)
- {
- int retry_count = 20;
- u8 hash384[SHA384_SUM_LEN];
- u64 img_addr, mbox_data_addr;
- size_t img_sz, mbox_data_sz;
- u8 *cert_hash_ptr, *mbox_relocate_data_addr;
- u32 resp = 0, resp_len = 1;
- int ret;
- img_addr = (uintptr_t)*p_image;
- debug("Authenticating image at address 0x%016llx (%ld bytes)\n",
- img_addr, *p_size);
- img_sz = get_img_size((u8 *)img_addr, *p_size);
- debug("img_sz = %ld\n", img_sz);
- if (!img_sz) {
- puts("VAB certificate not found in image!\n");
- return -ENOKEY;
- }
- if (!IS_ALIGNED(img_sz, sizeof(u32))) {
- printf("Image size (%ld bytes) not aliged to 4 bytes!\n",
- img_sz);
- return -EBFONT;
- }
- /* Generate HASH384 from the image */
- sha384_csum_wd((u8 *)img_addr, img_sz, hash384, CHUNKSZ_PER_WD_RESET);
- cert_hash_ptr = (u8 *)(img_addr + img_sz + VAB_CERT_MAGIC_OFFSET +
- VAB_CERT_FIT_SHA384_OFFSET);
- /*
- * Compare the SHA384 found in certificate against the SHA384
- * calculated from image
- */
- if (memcmp(hash384, cert_hash_ptr, SHA384_SUM_LEN)) {
- puts("SHA384 not match!\n");
- return -EKEYREJECTED;
- }
- mbox_data_addr = img_addr + img_sz - sizeof(u32);
- /* Size in word (32bits) */
- mbox_data_sz = (ALIGN(*p_size - img_sz, sizeof(u32))) >> 2;
- debug("mbox_data_addr = 0x%016llx\n", mbox_data_addr);
- debug("mbox_data_sz = %ld words\n", mbox_data_sz);
- /*
- * Relocate certificate to first memory block before trigger SMC call
- * to send mailbox command because ATF only able to access first
- * memory block.
- */
- mbox_relocate_data_addr = (u8 *)malloc(mbox_data_sz * sizeof(u32));
- if (!mbox_relocate_data_addr) {
- puts("Out of memory for VAB certificate relocation!\n");
- return -ENOMEM;
- }
- memcpy(mbox_relocate_data_addr, (u8 *)mbox_data_addr, mbox_data_sz * sizeof(u32));
- *(u32 *)mbox_relocate_data_addr = 0;
- debug("mbox_relocate_data_addr = 0x%p\n", mbox_relocate_data_addr);
- do {
- if (!IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_SPL_ATF)) {
- /* Invoke SMC call to ATF to send the VAB certificate to SDM */
- ret = smc_send_mailbox(MBOX_VAB_SRC_CERT, mbox_data_sz,
- (u32 *)mbox_relocate_data_addr, 0, &resp_len,
- &resp);
- } else {
- /* Send the VAB certficate to SDM for authentication */
- ret = mbox_send_cmd(MBOX_ID_UBOOT, MBOX_VAB_SRC_CERT,
- MBOX_CMD_DIRECT, mbox_data_sz,
- (u32 *)mbox_relocate_data_addr, 0, &resp_len,
- &resp);
- }
- /* If SDM is not available, just delay 50ms and retry again */
- if (ret == MBOX_RESP_DEVICE_BUSY)
- mdelay(50);
- else
- break;
- } while (--retry_count);
- /* Free the relocate certificate memory space */
- free(mbox_relocate_data_addr);
- /* Exclude the size of the VAB certificate from image size */
- *p_size = img_sz;
- debug("ret = 0x%08x, resp = 0x%08x, resp_len = %d\n", ret, resp,
- resp_len);
- if (ret) {
- /*
- * Unsupported mailbox command or device not in the
- * owned/secure state
- */
- if (ret == MBOX_RESP_NOT_ALLOWED_UNDER_SECURITY_SETTINGS) {
- /* SDM bypass authentication */
- printf("%s 0x%016llx (%ld bytes)\n",
- "Image Authentication bypassed at address",
- img_addr, img_sz);
- return 0;
- }
- puts("VAB certificate authentication failed in SDM");
- if (ret == MBOX_RESP_DEVICE_BUSY) {
- puts(" (SDM busy timeout)\n");
- return -ETIMEDOUT;
- } else if (ret == MBOX_RESP_UNKNOWN) {
- puts(" (Not supported)\n");
- return -ESRCH;
- }
- puts("\n");
- return -EKEYREJECTED;
- } else {
- /* If Certificate Process Status has error */
- if (resp) {
- puts("VAB certificate process failed\n");
- return -ENOEXEC;
- }
- }
- printf("%s 0x%016llx (%ld bytes)\n",
- "Image Authentication passed at address", img_addr, img_sz);
- return 0;
- }
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