Patch for bug 286102 from upstream git. It includes the following 5 commits:

commit 3826963e65d8c4c68bcd3e4066505f63ef734b95
Author: Benjamin Otte <otte@gnome.org>
Date:   Tue Sep 1 21:53:35 2009 +0200

commit 48e0af0157f52ac12b904bd92540432a18b139c7
Author: Benjamin Otte <otte@gnome.org>
Date:   Tue Sep 1 21:26:08 2009 +0200

commit bb7852e34b1845e516290e1b45a960a345ee8a43
Author: Benjamin Otte <otte@gnome.org>
Date:   Tue Sep 1 20:36:31 2009 +0200

commit fc44bf40a4eff8e122b223e97ee5efcbc548be03
Author: Benjamin Otte <otte@gnome.org>
Date:   Tue Sep 1 12:48:55 2009 +0200

commit e695c0932f5d02f3b222f0b7a3de1f8c00ba7b81
Author: Benjamin Otte <otte@gnome.org>
Date:   Tue Sep 1 11:54:48 2009 +0200

Patch generated by a3li@gentoo.org,
CVE available for 2.20.5 only (see timeline).

diff --git a/configure.in b/configure.in
index 7bda924..e2a33b5 100644
--- a/configure.in
+++ b/configure.in
@@ -952,7 +952,7 @@ AC_MSG_RESULT(unsigned $glib_size_type)
 
 # Check for some functions
 AC_CHECK_FUNCS(lstat strerror strsignal memmove vsnprintf stpcpy strcasecmp strncasecmp poll getcwd vasprintf setenv unsetenv getc_unlocked readlink symlink fdwalk)
-AC_CHECK_FUNCS(chown lchown fchmod fchown link statvfs statfs utimes getgrgid getpwuid)
+AC_CHECK_FUNCS(chown lchmod lchown fchmod fchown link statvfs statfs utimes getgrgid getpwuid)
 AC_CHECK_FUNCS(getmntent_r setmntent endmntent hasmntopt getmntinfo)
 # Check for high-resolution sleep functions
 AC_CHECK_FUNCS(nanosleep nsleep)
diff --git a/gio/glocalfileinfo.c b/gio/glocalfileinfo.c
index 72a59b5..a61cc55 100644
--- a/gio/glocalfileinfo.c
+++ b/gio/glocalfileinfo.c
@@ -1869,15 +1869,40 @@ get_string (const GFileAttributeValue  *value,
 
 static gboolean
 set_unix_mode (char                       *filename,
+               GFileQueryInfoFlags         flags,
 	       const GFileAttributeValue  *value,
 	       GError                    **error)
 {
   guint32 val;
+  int res = 0;
   
   if (!get_uint32 (value, &val, error))
     return FALSE;
-  
-  if (g_chmod (filename, val) == -1)
+
+#ifdef HAVE_SYMLINK
+  if (flags & G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS) {
+#ifdef HAVE_LCHMOD
+    res = lchmod (filename, val);
+#else
+    struct stat statbuf;
+    /* Calling chmod on a symlink changes permissions on the symlink.
+     * We don't want to do this, so we need to check for a symlink */
+    res = g_lstat (filename, &statbuf);
+    if (res == 0 && S_ISLNK (statbuf.st_mode))
+      {
+        g_set_error_literal (error, G_IO_ERROR,
+                             G_IO_ERROR_NOT_SUPPORTED,
+                             _("Cannot set permissions on symlinks"));
+        return FALSE;
+      }
+    else if (res == 0)
+      res = g_chmod (filename, val);
+#endif
+  } else
+#endif
+    res = g_chmod (filename, val);
+
+  if (res == -1)
     {
       int errsv = errno;
 
@@ -2172,7 +2197,7 @@ _g_local_file_info_set_attribute (char                 *filename,
   _g_file_attribute_value_set_from_pointer (&value, type, value_p, FALSE);
   
   if (strcmp (attribute, G_FILE_ATTRIBUTE_UNIX_MODE) == 0)
-    return set_unix_mode (filename, &value, error);
+    return set_unix_mode (filename, flags, &value, error);
   
 #ifdef HAVE_CHOWN
   else if (strcmp (attribute, G_FILE_ATTRIBUTE_UNIX_UID) == 0)
@@ -2316,7 +2341,7 @@ _g_local_file_info_set_attributes  (char                 *filename,
   value = _g_file_info_get_attribute_value (info, G_FILE_ATTRIBUTE_UNIX_MODE);
   if (value)
     {
-      if (!set_unix_mode (filename, value, error))
+      if (!set_unix_mode (filename, flags, value, error))
 	{
 	  value->status = G_FILE_ATTRIBUTE_STATUS_ERROR_SETTING;
 	  res = FALSE;