return r > 0 || changed;
}
-static int is_procfs_sysfs_or_suchlike(int fd) {
+/*
+ * Check if the filesystem is fully compatible with user namespaces or
+ * UID/GID patching. Some filesystems in this list can be fully mounted inside
+ * user namespaces, however their inodes may relate to host resources or only
+ * valid in the global user namespace, therefore no patching should be applied.
+ */
+static int is_fs_fully_userns_compatible(int fd) {
struct statfs sfs;
assert(fd >= 0);
/* We generally want to permit crossing of mount boundaries when patching the UIDs/GIDs. However, we
* probably shouldn't do this for /proc and /sys if that is already mounted into place. Hence, let's
- * stop the recursion when we hit a procfs or sysfs file system. */
- r = is_procfs_sysfs_or_suchlike(fd);
+ * stop the recursion when we hit procfs, sysfs or some other special file systems. */
+ r = is_fs_fully_userns_compatible(fd);
if (r < 0)
goto finish;
if (r > 0) {