d900731978
Previously dlsym resolved to the version in crt0.o or libc which would mean that the caller's shared object couldn't be determined correctly using __builtin_return_address(0). Mainly from FreeBSD, but adapted by me. Benefits of this solutions are: - backward comptibility maintained - existing broken binaries are fixed with a new ld.elf_so - __mainprog_obj can be removed from crt0.o - we do the same thing as FreeBSD Fixes PR 22067. OKed by Jason and Christos.
284 lines
8.3 KiB
C
284 lines
8.3 KiB
C
/* $NetBSD: ldd.c,v 1.20 2003/08/12 09:18:38 skrll Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Paul Kranenburg.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright 1996 John D. Polstra.
|
|
* Copyright 1996 Matt Thomas <matt@3am-software.com>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by John Polstra.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <a.out.h>
|
|
#include <dirent.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "debug.h"
|
|
#include "rtld.h"
|
|
|
|
/*
|
|
* Data declarations.
|
|
*/
|
|
static char *error_message; /* Message for dlopen(), or NULL */
|
|
bool _rtld_trust; /* False for setuid and setgid programs */
|
|
Obj_Entry *_rtld_objlist; /* Head of linked list of shared objects */
|
|
Obj_Entry **_rtld_objtail = &_rtld_objlist;
|
|
/* Link field of last object in list */
|
|
Obj_Entry *_rtld_objmain; /* The main program shared object */
|
|
int _rtld_pagesz;
|
|
|
|
Search_Path *_rtld_default_paths;
|
|
Search_Path *_rtld_paths;
|
|
Library_Xform *_rtld_xforms;
|
|
|
|
static void print_needed(Obj_Entry *);
|
|
static int ldd_aout(char *, int);
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct stat st;
|
|
|
|
#ifdef DEBUG
|
|
debug = 1;
|
|
#endif
|
|
_rtld_add_paths(&_rtld_default_paths, RTLD_DEFAULT_LIBRARY_PATH);
|
|
|
|
_rtld_pagesz = sysconf(_SC_PAGESIZE);
|
|
|
|
for (argc--, argv++; argc != 0; argc--, argv++) {
|
|
int fd = open(*argv, O_RDONLY);
|
|
if (fd == -1) {
|
|
warn("%s", *argv);
|
|
continue;
|
|
}
|
|
if (fstat(fd, &st) < 0) {
|
|
warn("%s", *argv);
|
|
close(fd);
|
|
continue;
|
|
}
|
|
|
|
_rtld_paths = NULL;
|
|
_rtld_trust = (st.st_mode & (S_ISUID | S_ISGID)) == 0;
|
|
if (_rtld_trust)
|
|
_rtld_add_paths(&_rtld_paths, getenv("LD_LIBRARY_PATH"));
|
|
|
|
_rtld_process_hints(&_rtld_paths, &_rtld_xforms, _PATH_LD_HINTS);
|
|
_rtld_objmain = _rtld_map_object(xstrdup(*argv), fd, &st);
|
|
if (_rtld_objmain == NULL) {
|
|
if (ldd_aout(*argv, fd) < 0)
|
|
warnx("%s", error_message);
|
|
close(fd);
|
|
continue;
|
|
}
|
|
close(fd);
|
|
|
|
_rtld_objmain->path = xstrdup(*argv);
|
|
_rtld_digest_dynamic(_rtld_objmain);
|
|
|
|
/* Link the main program into the list of objects. */
|
|
*_rtld_objtail = _rtld_objmain;
|
|
_rtld_objtail = &_rtld_objmain->next;
|
|
++_rtld_objmain->refcount;
|
|
|
|
(void) _rtld_load_needed_objects(_rtld_objmain, 0);
|
|
|
|
printf("%s:\n", _rtld_objmain->path);
|
|
print_needed(_rtld_objmain);
|
|
|
|
while (_rtld_objlist != NULL) {
|
|
Obj_Entry *obj = _rtld_objlist;
|
|
_rtld_objlist = obj->next;
|
|
while (obj->rpaths != NULL) {
|
|
const Search_Path *rpath = obj->rpaths;
|
|
obj->rpaths = rpath->sp_next;
|
|
free((void *) rpath->sp_path);
|
|
free((void *) rpath);
|
|
}
|
|
while (obj->needed != NULL) {
|
|
const Needed_Entry *needed = obj->needed;
|
|
obj->needed = needed->next;
|
|
free((void *) needed);
|
|
}
|
|
(void) munmap(obj->mapbase, obj->mapsize);
|
|
free(obj->path);
|
|
free(obj);
|
|
}
|
|
|
|
_rtld_objmain = NULL;
|
|
_rtld_objtail = &_rtld_objlist;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Error reporting function. Use it like printf. If formats the message
|
|
* into a buffer, and sets things up so that the next call to dlerror()
|
|
* will return the message.
|
|
*/
|
|
void
|
|
_rtld_error(const char *fmt, ...)
|
|
{
|
|
static char buf[512];
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
xvsnprintf(buf, sizeof buf, fmt, ap);
|
|
error_message = buf;
|
|
va_end(ap);
|
|
}
|
|
|
|
char *
|
|
dlerror()
|
|
{
|
|
char *msg = error_message;
|
|
error_message = NULL;
|
|
return msg;
|
|
}
|
|
|
|
static void
|
|
print_needed(Obj_Entry *obj)
|
|
{
|
|
const Needed_Entry *needed;
|
|
|
|
for (needed = obj->needed; needed != NULL; needed = needed->next) {
|
|
char libnamebuf[200];
|
|
const char *libname = obj->strtab + needed->name, *cp;
|
|
if (strncmp(libname, "lib", 3) == 0
|
|
&& (cp = strstr(libname, ".so")) != NULL) {
|
|
strcpy(libnamebuf, "-l");
|
|
memcpy(&libnamebuf[2], libname + 3, cp - (libname + 3));
|
|
strcpy(&libnamebuf[cp - (libname + 3) + 2], cp + 3);
|
|
libname = libnamebuf;
|
|
}
|
|
|
|
if (needed->obj != NULL) {
|
|
print_needed(needed->obj);
|
|
if (!needed->obj->printed) {
|
|
printf("\t %s => %s\n", libname,
|
|
needed->obj->path);
|
|
needed->obj->printed = 1;
|
|
}
|
|
} else {
|
|
printf("\t %s => not found\n", libname);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
ldd_aout(char *file, int fd)
|
|
{
|
|
struct exec hdr;
|
|
int status, rval;
|
|
|
|
lseek(fd, 0, SEEK_SET);
|
|
if (read(fd, &hdr, sizeof hdr) != sizeof hdr
|
|
|| (N_GETFLAG(hdr) & EX_DPMASK) != EX_DYNAMIC
|
|
#if 1 /* Compatibility */
|
|
|| hdr.a_entry < N_PAGSIZ(hdr)
|
|
#endif
|
|
) {
|
|
/* calling function prints warning */
|
|
return -1;
|
|
}
|
|
|
|
setenv("LD_TRACE_LOADED_OBJECTS", "", 1);
|
|
setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", file, 1);
|
|
printf("%s:\n", file);
|
|
fflush(stdout);
|
|
|
|
rval = 0;
|
|
switch (fork()) {
|
|
case -1:
|
|
err(1, "fork");
|
|
break;
|
|
default:
|
|
if (wait(&status) <= 0) {
|
|
warn("wait");
|
|
rval |= 1;
|
|
} else if (WIFSIGNALED(status)) {
|
|
fprintf(stderr, "%s: signal %d\n",
|
|
file, WTERMSIG(status));
|
|
rval |= 1;
|
|
} else if (WIFEXITED(status) && WEXITSTATUS(status)) {
|
|
fprintf(stderr, "%s: exit status %d\n",
|
|
file, WEXITSTATUS(status));
|
|
rval |= 1;
|
|
}
|
|
break;
|
|
case 0:
|
|
rval |= execl(file, file, NULL) != 0;
|
|
perror(file);
|
|
_exit(1);
|
|
}
|
|
return rval;
|
|
}
|