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
11int firmware_fallback_platform(struct fw_priv *fw_priv, u32 opt_flags)
12{
13	const u8 *data;
14	size_t size;
15	int rc;
16
17	if (!(opt_flags & FW_OPT_FALLBACK_PLATFORM))
18		return -ENOENT;
19
20	rc = security_kernel_load_data(LOADING_FIRMWARE_EFI_EMBEDDED);
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	if (!fw_priv->data)
31		fw_priv->data = vmalloc(size);
32	if (!fw_priv->data)
33		return -ENOMEM;
34
35	memcpy(fw_priv->data, data, size);
36	fw_priv->size = size;
37	fw_state_done(fw_priv);
38	return 0;
39}