projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| eec8b6ca | 1 | /* Check whether caller comes from the right place. |
| b168057a | 2 | Copyright (C) 2004-2015 Free Software Foundation, Inc. |
| eec8b6ca UD |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| eec8b6ca UD |
18 | |
| 19 | #include <assert.h> | |
| 20 | #include <ldsodefs.h> | |
| 21 | #include <stddef.h> | |
| 22 | #include <caller.h> | |
| 23 | #include <gnu/lib-names.h> | |
| 24 | ||
| 25 | ||
| 26 | int | |
| 27 | attribute_hidden | |
| 28 | _dl_check_caller (const void *caller, enum allowmask mask) | |
| 29 | { | |
| 30 | static const char expected1[] = LIBC_SO; | |
| 31 | static const char expected2[] = LIBDL_SO; | |
| 32 | #ifdef LIBPTHREAD_SO | |
| 33 | static const char expected3[] = LIBPTHREAD_SO; | |
| 34 | #endif | |
| 35 | static const char expected4[] = LD_SO; | |
| 36 | ||
| 22c83193 | 37 | for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) |
| c0f62c56 UD |
38 | for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL; |
| 39 | l = l->l_next) | |
| 40 | if (caller >= (const void *) l->l_map_start | |
| 41 | && caller < (const void *) l->l_text_end) | |
| 42 | { | |
| 43 | /* The address falls into this DSO's address range. Check the | |
| 44 | name. */ | |
| 45 | if ((mask & allow_libc) && strcmp (expected1, l->l_name) == 0) | |
| 46 | return 0; | |
| 47 | if ((mask & allow_libdl) && strcmp (expected2, l->l_name) == 0) | |
| 48 | return 0; | |
| eec8b6ca | 49 | #ifdef LIBPTHREAD_SO |
| c0f62c56 UD |
50 | if ((mask & allow_libpthread) && strcmp (expected3, l->l_name) == 0) |
| 51 | return 0; | |
| eec8b6ca | 52 | #endif |
| c0f62c56 UD |
53 | if ((mask & allow_ldso) && strcmp (expected4, l->l_name) == 0) |
| 54 | return 0; | |
| eec8b6ca | 55 | |
| c0f62c56 | 56 | struct libname_list *runp = l->l_libname; |
| eec8b6ca | 57 | |
| c0f62c56 UD |
58 | while (runp != NULL) |
| 59 | { | |
| 60 | if ((mask & allow_libc) && strcmp (expected1, runp->name) == 0) | |
| 61 | return 0; | |
| 62 | if ((mask & allow_libdl) && strcmp (expected2, runp->name) == 0) | |
| 63 | return 0; | |
| eec8b6ca | 64 | #ifdef LIBPTHREAD_SO |
| c0f62c56 UD |
65 | if ((mask & allow_libpthread) |
| 66 | && strcmp (expected3, runp->name) == 0) | |
| 67 | return 0; | |
| eec8b6ca | 68 | #endif |
| c0f62c56 UD |
69 | if ((mask & allow_ldso) && strcmp (expected4, runp->name) == 0) |
| 70 | return 0; | |
| eec8b6ca | 71 | |
| c0f62c56 UD |
72 | runp = runp->next; |
| 73 | } | |
| eec8b6ca | 74 | |
| c0f62c56 UD |
75 | break; |
| 76 | } | |
| eec8b6ca UD |
77 | |
| 78 | /* Maybe the dynamic linker is not yet on the list. */ | |
| 79 | if ((mask & allow_ldso) != 0 | |
| 80 | && caller >= (const void *) GL(dl_rtld_map).l_map_start | |
| 81 | && caller < (const void *) GL(dl_rtld_map).l_text_end) | |
| 82 | return 0; | |
| 83 | ||
| 84 | /* No valid caller. */ | |
| 85 | return 1; | |
| 86 | } |