Add range checking for FD_SET, FD_CLR, and FD_ISSET

1 files changed, 30 insertions, 0 deletions

diff --git a/debug/fdelt_chk.c b/debug/fdelt_chk.c
new file mode 100644
index 0000000..7d9e4b9
--- /dev/null
+++ b/debug/fdelt_chk.c
@@ -0,0 +1,30 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/select.h>
+
+
+unsigned long int
+__fdelt_chk (unsigned long int d)
+{
+  if (d >= FD_SETSIZE)
+    __chk_fail ();
+
+  return d / __NFDBITS;
+}
+strong_alias (__fdelt_chk, __fdelt_warn)