diff options
Diffstat (limited to 'libio/vtables.c')
-rw-r--r-- | libio/vtables.c | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/libio/vtables.c b/libio/vtables.c deleted file mode 100644 index 41b48db98c..0000000000 --- a/libio/vtables.c +++ /dev/null @@ -1,72 +0,0 @@ -/* libio vtable validation. - Copyright (C) 2016-2017 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 <dlfcn.h> -#include <libioP.h> -#include <stdio.h> - -#ifdef SHARED - -void (*IO_accept_foreign_vtables) (void) attribute_hidden; - -/* Used to detected multiple libcs. */ -extern struct dl_open_hook *_dl_open_hook; -libc_hidden_proto (_dl_open_hook); - -#else /* !SHARED */ - -/* Used to check whether static dlopen support is needed. */ -# pragma weak __dlopen - -#endif - -void attribute_hidden -_IO_vtable_check (void) -{ -#ifdef SHARED - /* Honor the compatibility flag. */ - void (*flag) (void) = atomic_load_relaxed (&IO_accept_foreign_vtables); -#ifdef PTR_DEMANGLE - PTR_DEMANGLE (flag); -#endif - if (flag == &_IO_vtable_check) - return; - - /* In case this libc copy is in a non-default namespace, we always - need to accept foreign vtables because there is always a - possibility that FILE * objects are passed across the linking - boundary. */ - { - Dl_info di; - struct link_map *l; - if (_dl_open_hook != NULL - || (_dl_addr (_IO_vtable_check, &di, &l, NULL) != 0 - && l->l_ns != LM_ID_BASE)) - return; - } - -#else /* !SHARED */ - /* We cannot perform vtable validation in the static dlopen case - because FILE * handles might be passed back and forth across the - boundary. Therefore, we disable checking in this case. */ - if (__dlopen != NULL) - return; -#endif - - __libc_fatal ("Fatal error: glibc detected an invalid stdio handle\n"); -} |