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-rw-r--r--src/shared/binfmt-util.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/src/shared/binfmt-util.c b/src/shared/binfmt-util.c
new file mode 100644
index 0000000..724d7f2
--- /dev/null
+++ b/src/shared/binfmt-util.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/vfs.h>
+
+#include "binfmt-util.h"
+#include "fileio.h"
+#include "missing_magic.h"
+#include "stat-util.h"
+
+int disable_binfmt(void) {
+ int r;
+
+ /* Flush out all rules. This is important during shutdown to cover for rules using "F", since those
+ * might pin a file and thus block us from unmounting stuff cleanly.
+ *
+ * We are a bit careful here, since binfmt_misc might still be an autofs which we don't want to
+ * trigger. */
+
+ r = path_is_fs_type("/proc/sys/fs/binfmt_misc", BINFMTFS_MAGIC);
+ if (r == 0 || r == -ENOENT) {
+ log_debug("binfmt_misc is not mounted, not detaching entries.");
+ return 0;
+ }
+ if (r < 0)
+ return log_warning_errno(r, "Failed to determine whether binfmt_misc is mounted: %m");
+
+ r = write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to unregister binfmt_misc entries: %m");
+
+ log_debug("Unregistered all remaining binfmt_misc entries.");
+ return 0;
+}