Move is_removable_media_path() to a shared location.

We need to use is_removable_media_path(), and potentially other helpers,
from Mok as well as shim.

This moves it to a file just for Device Path utility functions to make
that simpler.

Signed-off-by: Peter Jones <pjones@redhat.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/dp.c b/dp.c
new file mode 100644
index 00000000..3fc46f8d
--- /dev/null
+++ b/dp.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+/*
+ * dp.c - device path helpers
+ * Copyright Peter Jones <pjones@redhat.com>
+ */
+
+#include "shim.h"
+
+int
+is_removable_media_path(EFI_LOADED_IMAGE *li)
+{
+	unsigned int pathlen = 0;
+	CHAR16 *bootpath = NULL;
+	int ret = 0;
+
+	bootpath = DevicePathToStr(li->FilePath);
+
+	/* Check the beginning of the string and the end, to avoid
+	 * caring about which arch this is. */
+	/* I really don't know why, but sometimes bootpath gives us
+	 * L"\\EFI\\BOOT\\/BOOTX64.EFI".  So just handle that here...
+	 */
+	if (StrnCaseCmp(bootpath, L"\\EFI\\BOOT\\BOOT", 14) &&
+			StrnCaseCmp(bootpath, L"\\EFI\\BOOT\\/BOOT", 15) &&
+			StrnCaseCmp(bootpath, L"EFI\\BOOT\\BOOT", 13) &&
+			StrnCaseCmp(bootpath, L"EFI\\BOOT\\/BOOT", 14))
+		goto error;
+
+	pathlen = StrLen(bootpath);
+	if (pathlen < 5 || StrCaseCmp(bootpath + pathlen - 4, L".EFI"))
+		goto error;
+
+	ret = 1;
+
+error:
+	if (bootpath)
+		FreePool(bootpath);
+
+	return ret;
+}
+
+
+// vim:fenc=utf-8:tw=75:noet