lib/optee/optee.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Linaro
   4  * Bryan O'Donoghue <bryan.odonoghue@linaro.org>
   5  */
   6
   7 #include <common.h>
   8 #include <tee/optee.h>
   9
  10 #define optee_hdr_err_msg \
  11         "OPTEE verification error:" \
  12         "\n\thdr=%p image=0x%08lx magic=0x%08x tzdram 0x%08lx-0x%08lx " \
  13         "\n\theader lo=0x%08x hi=0x%08x size=0x%08lx arch=0x%08x" \
  14         "\n\tuimage params 0x%08lx-0x%08lx\n"
  15
  16 int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
  17                        unsigned long tzdram_len, unsigned long image_len)
  18 {
  19         unsigned long tzdram_end = tzdram_start + tzdram_len;
  20         uint32_t tee_file_size;
  21
  22         tee_file_size = hdr->init_size + hdr->paged_size +
  23                         sizeof(struct optee_header);
  24
  25         if (hdr->magic != OPTEE_MAGIC ||
  26             hdr->version != OPTEE_VERSION ||
  27             hdr->init_load_addr_hi > tzdram_end ||
  28             hdr->init_load_addr_lo < tzdram_start ||
  29             tee_file_size > tzdram_len ||
  30             tee_file_size != image_len ||
  31             (hdr->init_load_addr_lo + tee_file_size) > tzdram_end) {
  32                 return -EINVAL;
  33         }
  34
  35         return 0;
  36 }
  37
  38 int optee_verify_bootm_image(unsigned long image_addr,
  39                              unsigned long image_load_addr,
  40                              unsigned long image_len)
  41 {
  42         struct optee_header *hdr = (struct optee_header *)image_addr;
  43         unsigned long tzdram_start = CONFIG_OPTEE_TZDRAM_BASE;
  44         unsigned long tzdram_len = CONFIG_OPTEE_TZDRAM_SIZE;
  45
  46         int ret;
  47
  48         ret = optee_verify_image(hdr, tzdram_start, tzdram_len, image_len);
  49         if (ret)
  50                 goto error;
  51
  52         if (image_load_addr + sizeof(*hdr) != hdr->init_load_addr_lo) {
  53                 ret = -EINVAL;
  54                 goto error;
  55         }
  56
  57         return ret;
  58 error:
  59         printf(optee_hdr_err_msg, hdr, image_addr, hdr->magic, tzdram_start,
  60                tzdram_start + tzdram_len, hdr->init_load_addr_lo,
  61                hdr->init_load_addr_hi, image_len, hdr->arch, image_load_addr,
  62                image_load_addr + image_len);
  63
  64         return ret;
  65 }