Home | History | Annotate | Line # | Download | only in ld.elf_so
t_ifunc.c revision 1.5 
      1 /*	$NetBSD: t_ifunc.c,v 1.5 2017/11/06 21:16:03 joerg 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 ATF_TC(rtld_ifunc);
     39 
     40 ATF_TC_HEAD(rtld_ifunc, tc)
     41 {
     42 	atf_tc_set_md_var(tc, "descr", "ifunc functions are resolved");
     43 }
     44 
     45 ATF_TC_BODY(rtld_ifunc, tc)
     46 {
     47 	const char *envstr[] = {
     48 	    "0", "1"
     49 	};
     50 	int expected_result[] = {
     51 	    0xdeadbeef, 0xbeefdead
     52 	};
     53 	void *handle;
     54 	int (*sym)(void);
     55 	int result;
     56 	const char *error;
     57 	size_t i;
     58 
     59 #if !defined( __arm__) && !defined(__i386__) && !defined(__x86_64__) && !defined(__powerpc__) && !defined(__sparc__)
     60 	atf_tc_expect_fail("Missing linker support for hidden ifunc relocations");
     61 #endif
     62 
     63 	for (i = 0; i < __arraycount(envstr); ++i) {
     64 		setenv("USE_IFUNC2", envstr[i], 1);
     65 
     66 		handle = dlopen("libh_helper_ifunc_dso.so", RTLD_LAZY);
     67 		error = dlerror();
     68 		ATF_CHECK(error == NULL);
     69 		ATF_CHECK(handle != NULL);
     70 
     71 		sym = dlsym(handle, "ifunc");
     72 		error = dlerror();
     73 		ATF_CHECK(error == NULL);
     74 		ATF_CHECK(sym != NULL);
     75 
     76 		result = (*sym)();
     77 		ATF_CHECK(result == expected_result[i]);
     78 
     79 		dlclose(handle);
     80 		error = dlerror();
     81 		ATF_CHECK(error == NULL);
     82 
     83 		char *command;
     84 		easprintf(&command, "%s/h_ifunc %d",
     85 		    atf_tc_get_config_var(tc, "srcdir"), expected_result[i]);
     86 		if (system(command) != EXIT_SUCCESS)
     87 			atf_tc_fail("Test failed; see output for details");
     88 		free(command);
     89 	}
     90 }
     91 
     92 ATF_TC(rtld_hidden_ifunc);
     93 
     94 ATF_TC_HEAD(rtld_hidden_ifunc, tc)
     95 {
     96 	atf_tc_set_md_var(tc, "descr", "hidden ifunc functions are resolved");
     97 }
     98 
     99 ATF_TC_BODY(rtld_hidden_ifunc, tc)
    100 {
    101 	const char *envstr[] = {
    102 	    "0", "1"
    103 	};
    104 	int expected_result[] = {
    105 	    0xdeadbeef, 0xbeefdead
    106 	};
    107 	void *handle;
    108 	int (*sym)(void);
    109 	int (*(*sym2)(void))(void);
    110 	int result;
    111 	const char *error;
    112 	size_t i;
    113 
    114 	for (i = 0; i < __arraycount(envstr); ++i) {
    115 		setenv("USE_IFUNC2", envstr[i], 1);
    116 
    117 		handle = dlopen("libh_helper_ifunc_dso.so", RTLD_LAZY);
    118 		error = dlerror();
    119 		ATF_CHECK(error == NULL);
    120 		ATF_CHECK(handle != NULL);
    121 
    122 		sym = dlsym(handle, "ifunc_plt");
    123 		error = dlerror();
    124 		ATF_CHECK(error == NULL);
    125 		ATF_CHECK(sym != NULL);
    126 
    127 		result = (*sym)();
    128 		ATF_CHECK(result == expected_result[!i]);
    129 
    130 		sym2 = dlsym(handle, "ifunc_indirect");
    131 		error = dlerror();
    132 		ATF_CHECK(error == NULL);
    133 		ATF_CHECK(sym2 != NULL);
    134 
    135 		sym = (*sym2)();
    136 		result = (*sym)();
    137 		ATF_CHECK(result == expected_result[!i]);
    138 
    139 		dlclose(handle);
    140 		error = dlerror();
    141 		ATF_CHECK(error == NULL);
    142 
    143 		char *command;
    144 		easprintf(&command, "%s/h_ifunc %d",
    145 		    atf_tc_get_config_var(tc, "srcdir"), expected_result[i]);
    146 		if (system(command) != EXIT_SUCCESS)
    147 			atf_tc_fail("Test failed; see output for details");
    148 		free(command);
    149 	}
    150 }
    151 
    152 ATF_TC(rtld_main_ifunc);
    153 ATF_TC_HEAD(rtld_main_ifunc, tc)
    154 {
    155 	atf_tc_set_md_var(tc, "descr",
    156 	    "ifunc functions are resolved in the executable");
    157 }
    158 
    159 static unsigned int
    160 ifunc_helper(void)
    161 {
    162 	return 0xdeadbeef;
    163 }
    164 
    165 static __attribute__((used))
    166 unsigned int (*resolve_ifunc(void))(void)
    167 {
    168 	return ifunc_helper;
    169 }
    170 __hidden_ifunc(ifunc, resolve_ifunc);
    171 unsigned int ifunc(void);
    172 
    173 ATF_TC_BODY(rtld_main_ifunc, tc)
    174 {
    175 	ATF_CHECK(ifunc() == 0xdeadbeef);
    176 }
    177 
    178 ATF_TP_ADD_TCS(tp)
    179 {
    180 	ATF_TP_ADD_TC(tp, rtld_ifunc);
    181 	ATF_TP_ADD_TC(tp, rtld_hidden_ifunc);
    182 	ATF_TP_ADD_TC(tp, rtld_main_ifunc);
    183 	return 0;
    184 }
    185