// SPDX-License-Identifier: GPL-2.0

#include <linux/efi_embedded_fw.h>
#include <linux/property.h>
#include <linux/security.h>
#include <linux/vmalloc.h>

#include "fallback.h"
#include "firmware.h"

int firmware_fallback_platform(struct fw_priv *fw_priv)
{
        const u8 *data;
        size_t size;
        int rc;

        if (!(fw_priv->opt_flags & FW_OPT_FALLBACK_PLATFORM))
                return -ENOENT;

        rc = security_kernel_load_data(LOADING_FIRMWARE, true);
        if (rc)
                return rc;

        rc = efi_get_embedded_fw(fw_priv->fw_name, &data, &size);
        if (rc)
                return rc; /* rc == -ENOENT when the fw was not found */

        if (fw_priv->data && size > fw_priv->allocated_size)
                return -ENOMEM;

        rc = security_kernel_post_load_data((u8 *)data, size, LOADING_FIRMWARE,
                                                "platform");
        if (rc)
                return rc;

        if (!fw_priv->data)
                fw_priv->data = vmalloc(size);
        if (!fw_priv->data)
                return -ENOMEM;

        memcpy(fw_priv->data, data, size);
        fw_priv->size = size;
        fw_state_done(fw_priv);
        return 0;
}