2.5-18.1

1 files changed, 60 insertions, 0 deletions

diff --git a/debug/realpath_chk.c b/debug/realpath_chk.c
new file mode 100644
index 0000000000..961aea0b85
--- /dev/null
+++ b/debug/realpath_chk.c
@@ -0,0 +1,60 @@
+/* Copyright (C) 2005 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 <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+char *
+__realpath_chk (const char *buf, char *resolved, size_t resolvedlen)
+{
+#ifdef PATH_MAX
+  if (resolvedlen < PATH_MAX)
+    __chk_fail ();
+
+  return __realpath (buf, resolved);
+#else
+  long int pathmax =__pathconf (buf, _PC_PATH_MAX);
+  if (pathmax != -1)
+    {
+      /* We do have a fixed limit.  */
+      if (resolvedlen < pathmax)
+	__chk_fail ();
+
+      return __realpath (buf, resolved);
+    }
+
+  /* Since there is no fixed limit we check whether the size is large
+     enough.  */
+  char *res = __realpath (buf, NULL);
+  if (res != NULL)
+    {
+      size_t actlen = strlen (res) + 1;
+      if (actlen > resolvedlen)
+	__chk_fail ();
+
+      memcpy (resolved, res, actlen);
+      free (res);
+      res = resolved;
+    }
+
+  return res;
+#endif
+}