systemd/0046-boot-Manually-convert-filepaths-if-needed.patch
Jan Macku 79350f79d8 systemd-252-2
Resolves: #2137584,#2138081,#2141979
2022-12-09 09:36:14 +01:00

76 lines
3.0 KiB
Diff

From 806165285b822436023df84ca0a3e5b28a3099d6 Mon Sep 17 00:00:00 2001
From: Jan Janssen <medhefgo@web.de>
Date: Mon, 14 Nov 2022 15:24:32 +0100
Subject: [PATCH] boot: Manually convert filepaths if needed
The conversion of a filepath device path to text is needed for the stub
loader to find credential files.
(cherry picked from commit 679007044fbbcf82c66cf20b99f2f5086b7df6b4)
Related: #2138081
---
src/boot/efi/util.c | 40 ++++++++++++++++++++++++++++++++++++----
1 file changed, 36 insertions(+), 4 deletions(-)
diff --git a/src/boot/efi/util.c b/src/boot/efi/util.c
index 5547d288de..57436dbf0c 100644
--- a/src/boot/efi/util.c
+++ b/src/boot/efi/util.c
@@ -772,19 +772,51 @@ EFI_STATUS make_file_device_path(EFI_HANDLE device, const char16_t *file, EFI_DE
EFI_STATUS device_path_to_str(const EFI_DEVICE_PATH *dp, char16_t **ret) {
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *dp_to_text;
EFI_STATUS err;
+ _cleanup_free_ char16_t *str = NULL;
assert(dp);
assert(ret);
err = BS->LocateProtocol(&(EFI_GUID) EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID, NULL, (void **) &dp_to_text);
- if (err != EFI_SUCCESS)
- return err;
+ if (err != EFI_SUCCESS) {
+ /* If the device path to text protocol is not available we can still do a best-effort attempt
+ * to convert it ourselves if we are given filepath-only device path. */
+
+ size_t size = 0;
+ for (const EFI_DEVICE_PATH *node = dp; !IsDevicePathEnd(node);
+ node = NextDevicePathNode(node)) {
+
+ if (DevicePathType(node) != MEDIA_DEVICE_PATH ||
+ DevicePathSubType(node) != MEDIA_FILEPATH_DP)
+ return err;
+
+ size_t path_size = DevicePathNodeLength(node);
+ if (path_size <= offsetof(FILEPATH_DEVICE_PATH, PathName) || path_size % sizeof(char16_t))
+ return EFI_INVALID_PARAMETER;
+ path_size -= offsetof(FILEPATH_DEVICE_PATH, PathName);
+
+ _cleanup_free_ char16_t *old = str;
+ str = xmalloc(size + path_size);
+ if (old) {
+ memcpy(str, old, size);
+ str[size / sizeof(char16_t) - 1] = '\\';
+ }
+
+ memcpy(str + (size / sizeof(char16_t)),
+ ((uint8_t *) node) + offsetof(FILEPATH_DEVICE_PATH, PathName),
+ path_size);
+ size += path_size;
+ }
+
+ *ret = TAKE_PTR(str);
+ return EFI_SUCCESS;
+ }
- char16_t *str = dp_to_text->ConvertDevicePathToText(dp, false, false);
+ str = dp_to_text->ConvertDevicePathToText(dp, false, false);
if (!str)
return EFI_OUT_OF_RESOURCES;
- *ret = str;
+ *ret = TAKE_PTR(str);
return EFI_SUCCESS;
}