| 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(id: LOADING_FIRMWARE, contents: true); |
| 21 | if (rc) |
| 22 | return rc; |
| 23 | |
| 24 | rc = efi_get_embedded_fw(name: fw_priv->fw_name, dat: &data, sz: &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(buf: (u8 *)data, size, id: LOADING_FIRMWARE, |
| 32 | description: "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 | } |
| 46 |