efi_loader: support file rename in SetInfo()

Following the UEFI specification. The specification did not seem to
delineate if file_name was explicitly a file name only, or could
include paths to move the file to a different directory. The more
generous interpretation of supporting paths was selected.

Signed-off-by: Gabriel Dalimonte <gabriel.dalimonte@gmail.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

1 files changed, 39 insertions, 6 deletions

diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c
index 6b15c1f3d27..7d81da8f2d8 100644
--- a/lib/efi_loader/efi_file.c
+++ b/lib/efi_loader/efi_file.c
@@ -954,6 +954,7 @@ static efi_status_t EFIAPI efi_file_setinfo(struct efi_file_handle *file,
 {
 	struct file_handle *fh = to_fh(file);
 	efi_status_t ret = EFI_UNSUPPORTED;
+	char *new_file_name = NULL, *new_path = NULL;
 
 	EFI_ENTRY("%p, %pUs, %zu, %p", file, info_type, buffer_size, buffer);
 
@@ -983,13 +984,43 @@ static efi_status_t EFIAPI efi_file_setinfo(struct efi_file_handle *file,
 		pos = new_file_name;
 		utf16_utf8_strcpy(&pos, info->file_name);
 		if (strcmp(new_file_name, filename)) {
-			/* TODO: we do not support renaming */
-			EFI_PRINT("Renaming not supported\n");
-			free(new_file_name);
-			ret = EFI_ACCESS_DENIED;
-			goto out;
+			int dlen;
+			int rv;
+
+			if (set_blk_dev(fh)) {
+				ret = EFI_DEVICE_ERROR;
+				goto out;
+			}
+			dlen = filename - fh->path;
+			new_path = calloc(1, dlen + strlen(new_file_name) + 1);
+			if (!new_path) {
+				ret = EFI_OUT_OF_RESOURCES;
+				goto out;
+			}
+			memcpy(new_path, fh->path, dlen);
+			strcpy(new_path + dlen, new_file_name);
+			sanitize_path(new_path);
+			rv = fs_exists(new_path);
+			if (rv) {
+				ret = EFI_ACCESS_DENIED;
+				goto out;
+			}
+			/* fs_exists() calls fs_close(), so open file system again */
+			if (set_blk_dev(fh)) {
+				ret = EFI_DEVICE_ERROR;
+				goto out;
+			}
+			rv = fs_rename(fh->path, new_path);
+			if (rv) {
+				ret = EFI_ACCESS_DENIED;
+				goto out;
+			}
+			free(fh->path);
+			fh->path = new_path;
+			/* Prevent new_path from being freed on out */
+			new_path = NULL;
+			ret = EFI_SUCCESS;
 		}
-		free(new_file_name);
 		/* Check for truncation */
 		if (!fh->isdir) {
 			ret = efi_get_file_size(fh, &file_size);
@@ -1012,6 +1043,8 @@ static efi_status_t EFIAPI efi_file_setinfo(struct efi_file_handle *file,
 		ret = EFI_UNSUPPORTED;
 	}
 out:
+	free(new_path);
+	free(new_file_name);
 	return EFI_EXIT(ret);
 }