1 files changed, 66 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/sup_fs_check_permissions.c b/cpukit/libcsupport/src/sup_fs_check_permissions.c
new file mode 100644
index 0000000000..8dcecb6119
--- /dev/null
+++ b/cpukit/libcsupport/src/sup_fs_check_permissions.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2012 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/libio_.h>
+
+bool rtems_filesystem_check_access(
+  int eval_flags,
+  mode_t node_mode,
+  uid_t node_uid,
+  gid_t node_gid
+)
+{
+  mode_t perm_flags = eval_flags & RTEMS_LIBIO_PERMS_RWX;
+  uid_t task_uid = geteuid();
+
+  if (task_uid == 0 || task_uid == node_uid) {
+    perm_flags <<= 6;
+  } else {
+    gid_t task_gid = getegid();
+
+    if (task_gid == 0 || task_gid == node_gid) {
+      perm_flags <<= 3;
+    } else {
+      perm_flags <<= 0;
+    }
+  }
+
+  return (perm_flags & node_mode) == perm_flags;
+}
+
+bool rtems_filesystem_eval_path_check_access(
+  rtems_filesystem_eval_path_context_t *ctx,
+  int eval_flags,
+  mode_t node_mode,
+  uid_t node_uid,
+  gid_t node_gid
+)
+{
+  bool access_ok = rtems_filesystem_check_access(
+    eval_flags,
+    node_mode,
+    node_uid,
+    node_gid
+  );
+
+  if (!access_ok) {
+    rtems_filesystem_eval_path_error(ctx, EACCES);
+  }
+
+  return access_ok;
+}