1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "device-path-util.h"
#include "efivars.h"
#include "export-vars.h"
#include "part-discovery.h"
#include "util.h"
void export_common_variables(EFI_LOADED_IMAGE_PROTOCOL *loaded_image) {
assert(loaded_image);
/* Export the device path this image is started from, if it's not set yet */
if (loaded_image->DeviceHandle &&
efivar_get_raw(MAKE_GUID_PTR(LOADER), u"LoaderDevicePartUUID", NULL, NULL) != EFI_SUCCESS) {
_cleanup_free_ char16_t *uuid = disk_get_part_uuid(loaded_image->DeviceHandle);
if (uuid)
efivar_set_str16(MAKE_GUID_PTR(LOADER), u"LoaderDevicePartUUID", uuid, 0);
}
/* If LoaderImageIdentifier is not set, assume the image with this stub was loaded directly from the
* UEFI firmware without any boot loader, and hence set the LoaderImageIdentifier ourselves. Note
* that some boot chain loaders neither set LoaderImageIdentifier nor make FilePath available to us,
* in which case there's simple nothing to set for us. (The UEFI spec doesn't really say who's wrong
* here, i.e. whether FilePath may be NULL or not, hence handle this gracefully and check if FilePath
* is non-NULL explicitly.) */
if (loaded_image->FilePath &&
efivar_get_raw(MAKE_GUID_PTR(LOADER), u"LoaderImageIdentifier", NULL, NULL) != EFI_SUCCESS) {
_cleanup_free_ char16_t *s = NULL;
if (device_path_to_str(loaded_image->FilePath, &s) == EFI_SUCCESS)
efivar_set_str16(MAKE_GUID_PTR(LOADER), u"LoaderImageIdentifier", s, 0);
}
/* if LoaderFirmwareInfo is not set, let's set it */
if (efivar_get_raw(MAKE_GUID_PTR(LOADER), u"LoaderFirmwareInfo", NULL, NULL) != EFI_SUCCESS) {
_cleanup_free_ char16_t *s = NULL;
s = xasprintf("%ls %u.%02u", ST->FirmwareVendor, ST->FirmwareRevision >> 16, ST->FirmwareRevision & 0xffff);
efivar_set_str16(MAKE_GUID_PTR(LOADER), u"LoaderFirmwareInfo", s, 0);
}
/* ditto for LoaderFirmwareType */
if (efivar_get_raw(MAKE_GUID_PTR(LOADER), u"LoaderFirmwareType", NULL, NULL) != EFI_SUCCESS) {
_cleanup_free_ char16_t *s = NULL;
s = xasprintf("UEFI %u.%02u", ST->Hdr.Revision >> 16, ST->Hdr.Revision & 0xffff);
efivar_set_str16(MAKE_GUID_PTR(LOADER), u"LoaderFirmwareType", s, 0);
}
}
|
