[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/elf/dl-caller.c b/ap/libc/glibc/glibc-2.23/elf/dl-caller.c
new file mode 100644
index 0000000..4526da0
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/elf/dl-caller.c
@@ -0,0 +1,86 @@
+/* Check whether caller comes from the right place.
+ Copyright (C) 2004-2016 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/>. */
+
+#include <assert.h>
+#include <ldsodefs.h>
+#include <stddef.h>
+#include <caller.h>
+#include <gnu/lib-names.h>
+
+
+int
+attribute_hidden
+_dl_check_caller (const void *caller, enum allowmask mask)
+{
+ static const char expected1[] = LIBC_SO;
+ static const char expected2[] = LIBDL_SO;
+#ifdef LIBPTHREAD_SO
+ static const char expected3[] = LIBPTHREAD_SO;
+#endif
+ static const char expected4[] = LD_SO;
+
+ for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
+ for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL;
+ l = l->l_next)
+ if (caller >= (const void *) l->l_map_start
+ && caller < (const void *) l->l_text_end)
+ {
+ /* The address falls into this DSO's address range. Check the
+ name. */
+ if ((mask & allow_libc) && strcmp (expected1, l->l_name) == 0)
+ return 0;
+ if ((mask & allow_libdl) && strcmp (expected2, l->l_name) == 0)
+ return 0;
+#ifdef LIBPTHREAD_SO
+ if ((mask & allow_libpthread) && strcmp (expected3, l->l_name) == 0)
+ return 0;
+#endif
+ if ((mask & allow_ldso) && strcmp (expected4, l->l_name) == 0)
+ return 0;
+
+ struct libname_list *runp = l->l_libname;
+
+ while (runp != NULL)
+ {
+ if ((mask & allow_libc) && strcmp (expected1, runp->name) == 0)
+ return 0;
+ if ((mask & allow_libdl) && strcmp (expected2, runp->name) == 0)
+ return 0;
+#ifdef LIBPTHREAD_SO
+ if ((mask & allow_libpthread)
+ && strcmp (expected3, runp->name) == 0)
+ return 0;
+#endif
+ if ((mask & allow_ldso) && strcmp (expected4, runp->name) == 0)
+ return 0;
+
+ runp = runp->next;
+ }
+
+ break;
+ }
+
+ /* Maybe the dynamic linker is not yet on the list. */
+ if ((mask & allow_ldso) != 0
+ && caller >= (const void *) GL(dl_rtld_map).l_map_start
+ && caller < (const void *) GL(dl_rtld_map).l_text_end)
+ return 0;
+
+ /* No valid caller. */
+ return 1;
+}