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eec8b6ca | 1 | /* Check whether caller comes from the right place. |
688903eb | 2 | Copyright (C) 2004-2018 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 | } |