@@ -32,7 +32,7 @@ routines = $(all-dl-routines) dl-support dl-iteratephdr \
dl-routines = $(addprefix dl-,load lookup object reloc deps hwcaps \
runtime init fini debug misc \
version profile tls origin scope \
- execstack caller open close trampoline \
+ execstack open close trampoline \
exception sort-maps)
ifeq (yes,$(use-ldconfig))
dl-routines += dl-cache
@@ -54,7 +54,6 @@ all-dl-routines = $(dl-routines) $(sysdep-dl-routines)
# But they are absent from the shared libc, because that code is in ld.so.
elide-routines.os = $(all-dl-routines) dl-support enbl-secure dl-origin \
dl-sysdep dl-exception dl-reloc-static-pie
-shared-only-routines += dl-caller
# ld.so uses those routines, plus some special stuff for being the program
# interpreter and operating independent of libc.
deleted file mode 100644
@@ -1,86 +0,0 @@
-/* Check whether caller comes from the right place.
- Copyright (C) 2004-2018 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;
-}
@@ -33,7 +33,6 @@
#include "dynamic-link.h"
#include <abi-tag.h>
#include <stackinfo.h>
-#include <caller.h>
#include <sysdep.h>
#include <stap-probe.h>
#include <libc-pointer-arith.h>
@@ -1183,12 +1182,6 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
if (__glibc_unlikely ((stack_flags &~ GL(dl_stack_flags)) & PF_X))
{
- if (__glibc_unlikely (__check_caller (RETURN_ADDRESS (0), allow_ldso) != 0))
- {
- errstring = N_("invalid caller");
- goto call_lose;
- }
-
/* The stack is presently not executable, but this module
requires that it be executable. We must change the
protection of the variable which contains the flags used in
@@ -28,7 +28,6 @@
#include <sys/param.h>
#include <libc-lock.h>
#include <ldsodefs.h>
-#include <caller.h>
#include <sysdep-cancel.h>
#include <tls.h>
#include <stap-probe.h>
@@ -47,8 +46,6 @@ struct dl_open_args
int mode;
/* This is the caller of the dlopen() function. */
const void *caller_dlopen;
- /* This is the caller of _dl_open(). */
- const void *caller_dl_open;
struct link_map *map;
/* Namespace ID. */
Lmid_t nsid;
@@ -187,11 +184,6 @@ dl_open_worker (void *a)
int mode = args->mode;
struct link_map *call_map = NULL;
- /* Check whether _dl_open() has been called from a valid DSO. */
- if (__check_caller (args->caller_dl_open,
- allow_libc|allow_libdl|allow_ldso) != 0)
- _dl_signal_error (0, "dlopen", NULL, N_("invalid caller"));
-
/* Determine the caller's map if necessary. This is needed in case
we have a DST, when we don't know the namespace ID we have to put
the new object in, or when the file name has no path in which
@@ -583,7 +575,6 @@ no more namespaces available for dlmopen()"));
args.file = file;
args.mode = mode;
args.caller_dlopen = caller_dlopen;
- args.caller_dl_open = RETURN_ADDRESS (0);
args.map = NULL;
args.nsid = nsid;
args.argc = argc;
@@ -278,7 +278,6 @@ struct rtld_global_ro _rtld_global_ro attribute_relro =
._dl_debug_printf = _dl_debug_printf,
._dl_mcount = _dl_mcount,
._dl_lookup_symbol_x = _dl_lookup_symbol_x,
- ._dl_check_caller = _dl_check_caller,
._dl_open = _dl_open,
._dl_close = _dl_close,
._dl_tls_get_addr_soft = _dl_tls_get_addr_soft,
deleted file mode 100644
@@ -1,31 +0,0 @@
-/* Copyright (C) 2004-2018 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 _CALLER_H
-#define _CALLER_H 1
-
-#include <ldsodefs.h>
-
-/* _dl_check_caller only works in DSOs. */
-#ifdef SHARED
-# define __check_caller(caller, mask) \
- GLRO(dl_check_caller) (caller, mask)
-#else
-# define __check_caller(caller, mask) (0)
-#endif
-
-#endif /* caller.h */
@@ -596,7 +596,6 @@ struct rtld_global_ro
const ElfW(Sym) **, struct r_scope_elem *[],
const struct r_found_version *, int, int,
struct link_map *);
- int (*_dl_check_caller) (const void *, enum allowmask);
void *(*_dl_open) (const char *file, int mode, const void *caller_dlopen,
Lmid_t nsid, int argc, char *argv[], char *env[]);
void (*_dl_close) (void *map);
@@ -1102,10 +1101,6 @@ extern size_t _dl_dst_count (const char *name) attribute_hidden;
extern char *_dl_dst_substitute (struct link_map *l, const char *name,
char *result) attribute_hidden;
-/* Check validity of the caller. */
-extern int _dl_check_caller (const void *caller, enum allowmask mask)
- attribute_hidden;
-
/* Open the shared object NAME, relocate it, and run its initializer if it
hasn't already been run. MODE is as for `dlopen' (see <dlfcn.h>). If
the object is already opened, returns its existing map. */
@@ -22,7 +22,6 @@
#include <libintl.h>
#include <stdbool.h>
#include <stackinfo.h>
-#include <caller.h>
#include <sysdep.h>
@@ -37,12 +36,6 @@ _dl_make_stack_executable (void **stack_endp)
& -(intptr_t) GLRO(dl_pagesize));
int result = 0;
- /* Challenge the caller. */
- if (__builtin_expect (__check_caller (RETURN_ADDRESS (0),
- allow_ldso|allow_libpthread) != 0, 0)
- || __builtin_expect (*stack_endp != __libc_stack_end, 0))
- return EPERM;
-
if (__builtin_expect (__mprotect ((void *) page, GLRO(dl_pagesize),
__stack_prot) == 0, 1))
goto return_success;