| /* 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; |
| } |