drivers/base/firmware_loader/fallback_platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/efi_embedded_fw.h>
   4 #include <linux/property.h>
   5 #include <linux/security.h>
   6 #include <linux/vmalloc.h>
   7
   8 #include "fallback.h"
   9 #include "firmware.h"
  10
  11 int firmware_fallback_platform(struct fw_priv *fw_priv)
  12 {
  13         const u8 *data;
  14         size_t size;
  15         int rc;
  16
  17         if (!(fw_priv->opt_flags & FW_OPT_FALLBACK_PLATFORM))
  18                 return -ENOENT;
  19
  20         rc = security_kernel_load_data(LOADING_FIRMWARE, true);
  21         if (rc)
  22                 return rc;
  23
  24         rc = efi_get_embedded_fw(fw_priv->fw_name, &data, &size);
  25         if (rc)
  26                 return rc; /* rc == -ENOENT when the fw was not found */
  27
  28         if (fw_priv->data && size > fw_priv->allocated_size)
  29                 return -ENOMEM;
  30
  31         rc = security_kernel_post_load_data((u8 *)data, size, LOADING_FIRMWARE,
  32                                                 "platform");
  33         if (rc)
  34                 return rc;
  35
  36         if (!fw_priv->data)
  37                 fw_priv->data = vmalloc(size);
  38         if (!fw_priv->data)
  39                 return -ENOMEM;
  40
  41         memcpy(fw_priv->data, data, size);
  42         fw_priv->size = size;
  43         fw_state_done(fw_priv);
  44         return 0;
  45 }