summaryrefslogtreecommitdiff
path: root/debug/realpath_chk.c
diff options
context:
space:
mode:
authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /debug/realpath_chk.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
downloadglibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.gz
2.5-18.1
Diffstat (limited to 'debug/realpath_chk.c')
-rw-r--r--debug/realpath_chk.c60
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
+}