1 files changed, 58 insertions, 0 deletions
diff --git a/src/util-pages.c b/src/util-pages.c
new file mode 100644
index 0000000..170170b
--- /dev/null
+++ b/src/util-pages.c
@@ -0,0 +1,58 @@
+/* Copyright (C) 2016 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \file
+ *
+ * \author Victor Julien <victor@inliniac.net>
+ *
+ * Page util functions
+ */
+
+#include "suricata-common.h"
+#include "util-pages.h"
+#include "util-debug.h"
+
+#ifndef HAVE_PAGESUPPORTSRWX_AS_MACRO
+
+/** \brief check if OS allows for RWX pages
+ *
+ *  Some OS' disallow RWX pages for security reasons. This function mmaps
+ *  some memory RW and then tries to turn it into RWX. If this fails we
+ *  assume that the OS doesn't allow for this.
+ *
+ *  Thanks to Shawn Webb from HardenedBSD for the suggestion.
+ *
+ *  \retval 1 RWX supported
+ *  \retval 0 not supported
+ */
+int PageSupportsRWX(void)
+{
+    int retval = 1;
+    void *ptr;
+    ptr = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0);
+    if (ptr != MAP_FAILED) {
+        if (mprotect(ptr, getpagesize(), PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
+            SCLogConfig("RWX pages denied by OS");
+            retval = 0;
+        }
+        munmap(ptr, getpagesize());
+    }
+    return retval;
+}
+#endif /* HAVE_PAGESUPPORTSRWX_AS_MACRO */
+