xref: /netbsd-src/tests/libexec/ld.elf_so/t_ifunc.c (revision 546ccfe0da4c3d08144df9b0b19f344be6a52f98)
1 /*	$NetBSD: t_ifunc.c,v 1.13 2022/06/21 16:24:37 christos Exp $	*/
2 
3 /*
4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
17  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include <sys/types.h>
31 
32 #include <atf-c.h>
33 #include <dlfcn.h>
34 #include <util.h>
35 
36 #include "h_macros.h"
37 
38 #if \
39     defined(__aarch64__) || \
40     defined(__arm__) || \
41     defined(__i386__) || \
42     defined(__powerpc__) || \
43     defined(__sparc__) || \
44     defined(__x86_64__)
45 #define	LINKER_SUPPORT 1
46 #else
47 #define	LINKER_SUPPORT 0
48 #endif
49 
50 ATF_TC(rtld_ifunc);
51 
ATF_TC_HEAD(rtld_ifunc,tc)52 ATF_TC_HEAD(rtld_ifunc, tc)
53 {
54 	atf_tc_set_md_var(tc, "descr", "ifunc functions are resolved");
55 }
56 
ATF_TC_BODY(rtld_ifunc,tc)57 ATF_TC_BODY(rtld_ifunc, tc)
58 {
59 	const char *envstr[] = {
60 	    "0", "1"
61 	};
62 	long long expected_result[] = {
63 	    0xdeadbeefll, 0xbeefdeadll
64 	};
65 	void *handle;
66 	long long (*sym)(void);
67 	long long result;
68 	const char *error;
69 	size_t i;
70 
71 	if (!LINKER_SUPPORT)
72 		atf_tc_skip("Missing linker support for ifunc relocations");
73 
74 	for (i = 0; i < __arraycount(envstr); ++i) {
75 		setenv("USE_IFUNC2", envstr[i], 1);
76 
77 		handle = dlopen("libh_helper_ifunc_dso.so", RTLD_LAZY);
78 		error = dlerror();
79 		ATF_CHECK(error == NULL);
80 		ATF_CHECK(handle != NULL);
81 
82 		sym = dlsym(handle, "ifunc");
83 		error = dlerror();
84 		ATF_CHECK(error == NULL);
85 		ATF_CHECK(sym != NULL);
86 
87 		result = (*sym)();
88 		ATF_CHECK(result == expected_result[i]);
89 
90 		dlclose(handle);
91 		error = dlerror();
92 		ATF_CHECK(error == NULL);
93 
94 		char *command;
95 		easprintf(&command, "%s/h_ifunc %lld",
96 		    atf_tc_get_config_var(tc, "srcdir"), expected_result[i]);
97 		if (system(command) != EXIT_SUCCESS)
98 			atf_tc_fail("Test failed; see output for details");
99 		free(command);
100 	}
101 }
102 
103 ATF_TC(rtld_hidden_ifunc);
104 
ATF_TC_HEAD(rtld_hidden_ifunc,tc)105 ATF_TC_HEAD(rtld_hidden_ifunc, tc)
106 {
107 	atf_tc_set_md_var(tc, "descr", "hidden ifunc functions are resolved");
108 }
109 
ATF_TC_BODY(rtld_hidden_ifunc,tc)110 ATF_TC_BODY(rtld_hidden_ifunc, tc)
111 {
112 	const char *envstr[] = {
113 	    "0", "1"
114 	};
115 	long long expected_result[] = {
116 	    0xdeadbeefll, 0xbeefdeadll
117 	};
118 	void *handle;
119 	long long (*sym)(void);
120 	long long (*(*sym2)(void))(void);
121 	long long result;
122 	const char *error;
123 	size_t i;
124 
125 	if (!LINKER_SUPPORT)
126 		atf_tc_skip("Missing linker support for ifunc relocations");
127 
128 	for (i = 0; i < __arraycount(envstr); ++i) {
129 		setenv("USE_IFUNC2", envstr[i], 1);
130 
131 		handle = dlopen("libh_helper_ifunc_dso.so", RTLD_LAZY);
132 		error = dlerror();
133 		ATF_CHECK(error == NULL);
134 		ATF_CHECK(handle != NULL);
135 
136 		sym = dlsym(handle, "ifunc_plt");
137 		error = dlerror();
138 		ATF_CHECK(error == NULL);
139 		ATF_CHECK(sym != NULL);
140 
141 		result = (*sym)();
142 		ATF_CHECK(result == expected_result[!i]);
143 
144 		sym2 = dlsym(handle, "ifunc_indirect");
145 		error = dlerror();
146 		ATF_CHECK(error == NULL);
147 		ATF_CHECK(sym2 != NULL);
148 
149 		sym = (*sym2)();
150 		result = (*sym)();
151 		ATF_CHECK(result == expected_result[!i]);
152 
153 		dlclose(handle);
154 		error = dlerror();
155 		ATF_CHECK(error == NULL);
156 
157 		char *command;
158 		easprintf(&command, "%s/h_ifunc %lld",
159 		    atf_tc_get_config_var(tc, "srcdir"), expected_result[i]);
160 		if (system(command) != EXIT_SUCCESS)
161 			atf_tc_fail("Test failed; see output for details");
162 		free(command);
163 	}
164 }
165 
166 ATF_TC(rtld_main_ifunc);
ATF_TC_HEAD(rtld_main_ifunc,tc)167 ATF_TC_HEAD(rtld_main_ifunc, tc)
168 {
169 	atf_tc_set_md_var(tc, "descr",
170 	    "ifunc functions are resolved in the executable");
171 }
172 
173 #if LINKER_SUPPORT
174 static long long
ifunc_helper(void)175 ifunc_helper(void)
176 {
177 	return 0xdeadbeefll;
178 }
179 
180 static __attribute__((used))
resolve_ifunc(void)181 long long (*resolve_ifunc(void))(void)
182 {
183 	return ifunc_helper;
184 }
185 __hidden_ifunc(ifunc, resolve_ifunc);
186 #endif
187 long long ifunc(void);
188 
ATF_TC_BODY(rtld_main_ifunc,tc)189 ATF_TC_BODY(rtld_main_ifunc, tc)
190 {
191 	if (!LINKER_SUPPORT)
192 		atf_tc_skip("Missing linker support for ifunc relocations");
193 	ATF_CHECK(ifunc() == 0xdeadbeefll);
194 }
195 
ATF_TP_ADD_TCS(tp)196 ATF_TP_ADD_TCS(tp)
197 {
198 	ATF_TP_ADD_TC(tp, rtld_ifunc);
199 	ATF_TP_ADD_TC(tp, rtld_hidden_ifunc);
200 	ATF_TP_ADD_TC(tp, rtld_main_ifunc);
201 	return atf_no_error();
202 }
203