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glibc/elf/dl-caller.c
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/* 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; | |
} |