Factor mmap/munmap of PT_LOAD segments out of _dl_map_object_from_fd et al.

1 files changed, 35 insertions, 0 deletions

diff --git a/elf/dl-unmap-segments.h b/elf/dl-unmap-segments.h
new file mode 100644
index 0000000000..ce9c3fecfa
--- /dev/null
+++ b/elf/dl-unmap-segments.h
@@ -0,0 +1,35 @@
+/* Unmap a shared object's segments.  Generic version.
+   Copyright (C) 2014 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _DL_UNMAP_SEGMENTS_H
+#define _DL_UNMAP_SEGMENTS_H	1
+
+#include <link.h>
+#include <sys/mman.h>
+
+/* _dl_map_segments ensures that any whole pages in gaps between segments
+   are filled in with PROT_NONE mappings.  So we can just unmap the whole
+   range in one fell swoop.  */
+
+static __always_inline void
+_dl_unmap_segments (struct link_map *l)
+{
+  __munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);
+}
+
+#endif  /* dl-unmap-segments.h */