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365624e2 | 1 | /* Test interactions of dlopen, NODELETE, and relocations. |
581c785b | 2 | Copyright (C) 2019-2022 Free Software Foundation, Inc. |
365624e2 FW |
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 | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* This test exercises NODELETE propagation due to data relocations | |
20 | and unique symbols, and the interaction with already-loaded | |
21 | objects. Some test objects are written in C++, to produce unique | |
22 | symbol definitions. | |
23 | ||
24 | First test: Global scope variant, data relocation as the NODELETE | |
25 | trigger. mod1 is loaded first with a separate dlopen call. | |
26 | ||
27 | mod2 ---(may_finalize_mod1 relocation dependency)---> mod1 | |
28 | (NODELETE) (marked as NODELETE) | |
29 | ||
30 | Second test: Local scope variant, data relocation. mod3 is loaded | |
31 | first, then mod5. | |
32 | ||
33 | mod5 ---(DT_NEEDED)---> mod4 ---(DT_NEEDED)---> mod3 | |
34 | (NODELETE) (not NODELETE) ^ | |
35 | \ / (marked as | |
36 | `--(may_finalize_mod3 relocation dependency)--/ NODELETE) | |
37 | ||
38 | Third test: Shared local scope with unique symbol. mod6 is loaded | |
39 | first, then mod7. No explicit dependencies between the two | |
40 | objects, so first object has to be opened with RTLD_GLOBAL. | |
41 | ||
42 | mod7 ---(unique symbol)---> mod6 | |
43 | (marked as NODELETE) | |
44 | ||
45 | Forth test: Non-shared scopes with unique symbol. mod8 and mod10 | |
46 | are loaded from the main program. mod8 loads mod9 from an ELF | |
47 | constructor, mod10 loads mod11. There are no DT_NEEDED | |
48 | dependencies. mod9 is promoted to the global scope form the main | |
49 | program. The unique symbol dependency is: | |
50 | ||
51 | mod9 ---(unique symbol)---> mod11 | |
52 | (marked as NODELETE) | |
53 | ||
54 | Fifth test: Shared local scope with unique symbol, like test 3, but | |
55 | this time, there is also a DT_NEEDED dependency (so no RTLD_GLOBAL | |
56 | needed): | |
57 | ||
58 | DT_NEEDED | |
59 | mod13 ---(unique symbol)---> mod12 | |
60 | (marked as NODELETE) | |
61 | ||
62 | Sixth test: NODELETE status is retained after relocation failure | |
63 | with unique symbol dependency. The object graph ensures that the | |
64 | unique symbol binding is processed before the dlopen failure. | |
65 | ||
66 | DT_NEEDED | |
67 | mod17 --(DT_NEEDED)--> mod15 --(unique symbol)--> mod14 | |
68 | \ ^ (RTLD_NODELETE) | |
69 | \ (DT_NEEDED) | |
70 | \ | | |
71 | `---(DT_NEEDED)--> mod16 | |
72 | (fails to relocate) | |
73 | ||
74 | mod14 is loaded first, and the loading mod17 is attempted. | |
75 | mod14 must remain NODELETE after opening mod17 failed. */ | |
76 | ||
77 | #include <stdio.h> | |
78 | #include <string.h> | |
79 | #include <stdbool.h> | |
80 | #include <support/check.h> | |
81 | #include <support/xdlfcn.h> | |
82 | ||
83 | static int | |
84 | do_test (void) | |
85 | { | |
86 | /* First case: global scope, regular data symbol. Open the object | |
87 | which is not NODELETE initially. */ | |
88 | void *mod1 = xdlopen ("tst-dlopen-nodelete-reloc-mod1.so", | |
89 | RTLD_NOW | RTLD_GLOBAL); | |
90 | /* This is used to indicate that the ELF destructor may be | |
91 | called. */ | |
92 | bool *may_finalize_mod1 = xdlsym (mod1, "may_finalize_mod1"); | |
93 | /* Open the NODELETE object. */ | |
94 | void *mod2 = xdlopen ("tst-dlopen-nodelete-reloc-mod2.so", RTLD_NOW); | |
95 | /* This has no effect because the DSO is directly marked as | |
96 | NODELETE. */ | |
97 | xdlclose (mod2); | |
98 | /* This has no effect because the DSO has been indirectly marked as | |
99 | NODELETE due to a relocation dependency. */ | |
100 | xdlclose (mod1); | |
101 | ||
102 | /* Second case: local scope, regular data symbol. Open the object | |
103 | which is not NODELETE initially. */ | |
104 | void *mod3 = xdlopen ("tst-dlopen-nodelete-reloc-mod3.so", RTLD_NOW); | |
105 | bool *may_finalize_mod3 = xdlsym (mod3, "may_finalize_mod3"); | |
106 | /* Open the NODELETE object. */ | |
107 | void *mod5 = xdlopen ("tst-dlopen-nodelete-reloc-mod5.so", RTLD_NOW); | |
108 | /* Again those have no effect because of NODELETE. */ | |
109 | xdlclose (mod5); | |
110 | xdlclose (mod3); | |
111 | ||
112 | /* Third case: Unique symbol. */ | |
113 | void *mod6 = xdlopen ("tst-dlopen-nodelete-reloc-mod6.so", | |
114 | RTLD_NOW | RTLD_GLOBAL); | |
115 | bool *may_finalize_mod6 = xdlsym (mod6, "may_finalize_mod6"); | |
116 | void *mod7 = xdlopen ("tst-dlopen-nodelete-reloc-mod7.so", RTLD_NOW); | |
117 | bool *may_finalize_mod7 = xdlsym (mod7, "may_finalize_mod7"); | |
118 | /* This should not have any effect because of the unique symbol and | |
119 | the resulting NODELETE status. */ | |
120 | xdlclose (mod6); | |
121 | /* mod7 is not NODELETE and can be closed. */ | |
122 | *may_finalize_mod7 = true; | |
123 | xdlclose (mod7); | |
124 | ||
125 | /* Fourth case: Unique symbol, indirect loading. */ | |
126 | void *mod8 = xdlopen ("tst-dlopen-nodelete-reloc-mod8.so", RTLD_NOW); | |
127 | /* Also promote to global scope. */ | |
128 | void *mod9 = xdlopen ("tst-dlopen-nodelete-reloc-mod9.so", | |
129 | RTLD_NOW | RTLD_NOLOAD | RTLD_GLOBAL); | |
130 | bool *may_finalize_mod9 = xdlsym (mod9, "may_finalize_mod9"); | |
131 | xdlclose (mod9); /* Drop mod9 reference. */ | |
132 | void *mod10 = xdlopen ("tst-dlopen-nodelete-reloc-mod10.so", RTLD_NOW); | |
133 | void *mod11 = xdlopen ("tst-dlopen-nodelete-reloc-mod11.so", | |
134 | RTLD_NOW | RTLD_NOLOAD); | |
135 | bool *may_finalize_mod11 = xdlsym (mod11, "may_finalize_mod11"); | |
136 | xdlclose (mod11); /* Drop mod11 reference. */ | |
137 | /* mod11 is not NODELETE and can be closed. */ | |
138 | *may_finalize_mod11 = true; | |
139 | /* Trigger closing of mod11, too. */ | |
140 | xdlclose (mod10); | |
141 | /* Does not trigger closing of mod9. */ | |
142 | xdlclose (mod8); | |
143 | ||
144 | /* Fifth case: Unique symbol, with DT_NEEDED dependency. */ | |
145 | void *mod12 = xdlopen ("tst-dlopen-nodelete-reloc-mod12.so", RTLD_NOW); | |
146 | bool *may_finalize_mod12 = xdlsym (mod12, "may_finalize_mod12"); | |
147 | void *mod13 = xdlopen ("tst-dlopen-nodelete-reloc-mod13.so", RTLD_NOW); | |
148 | bool *may_finalize_mod13 = xdlsym (mod13, "may_finalize_mod13"); | |
149 | /* This should not have any effect because of the unique symbol. */ | |
150 | xdlclose (mod12); | |
151 | /* mod13 is not NODELETE and can be closed. */ | |
152 | *may_finalize_mod13 = true; | |
153 | xdlclose (mod13); | |
154 | ||
155 | /* Sixth case: Unique symbol binding must not cause loss of NODELETE | |
156 | status. */ | |
157 | void *mod14 = xdlopen ("tst-dlopen-nodelete-reloc-mod14.so", | |
158 | RTLD_NOW | RTLD_NODELETE); | |
159 | bool *may_finalize_mod14 = xdlsym (mod14, "may_finalize_mod14"); | |
160 | TEST_VERIFY (dlopen ("tst-dlopen-nodelete-reloc-mod17.so", RTLD_NOW) | |
161 | == NULL); | |
162 | const char *message = dlerror (); | |
163 | printf ("info: test 6 message: %s\n", message); | |
164 | /* This must not close the object, it must still be NODELETE. */ | |
165 | xdlclose (mod14); | |
166 | xdlopen ("tst-dlopen-nodelete-reloc-mod14.so", RTLD_NOW | RTLD_NOLOAD); | |
167 | ||
168 | /* Prepare for process exit. Destructors for NODELETE objects will | |
169 | be invoked. */ | |
170 | *may_finalize_mod1 = true; | |
171 | *may_finalize_mod3 = true; | |
172 | *may_finalize_mod6 = true; | |
173 | *may_finalize_mod9 = true; | |
174 | *may_finalize_mod12 = true; | |
175 | *may_finalize_mod14 = true; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | #include <support/test-driver.c> |