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	Andrey Sverdlichenko <blaze@infosec.ru>
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Date: 19 Dec 2000 17:29:49 +0300
From: Andrey Sverdlichenko <blaze@infosec.ru>
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To: FreeBSD-gnats-submit@freebsd.org
Subject: i386/23643: dlopen() can't link to symbols in main program module
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>Number:         23643
>Category:       i386
>Synopsis:       dlopen() can't link to symbols in main program module
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 19 06:30:03 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Andrey Sverdlichenko
>Release:        FreeBSD 4.1.1-STABLE i386
>Organization:
NIP "Informzaschita"
>Environment:
FreeBSD xen.infosec.ru 4.1.1-STABLE FreeBSD 4.1.1-STABLE #4: Mon Oct 30 15:39:57 MSK 2000     blaze@xen.infosec.ru:/var/tmp/src/sys/compile/XEN  i386

>Description:

Call dlopen(..., RTLD_NOW) returns "Undefined symbol" when shared object 
uses a symbol from main program.

>How-To-Repeat:

Makefile
----------- begin Makefile -----------

prog: lib.so main.c
        gcc -g -fpic -DPIC -Wall -o prog main.c

lib.so: lib.c
        gcc -fpic -DPIC -O -pipe -Wall -c lib.c
        cc -shared -o lib.so lib.o

clean:
        rm -f prog *.o *.so
----------- end Makefile ---------------

main.c

----------- begin main.c ---------------
#include <stdio.h>
#include <sys/types.h>
#include <dlfcn.h>

char *str = "ok";

int main() {
        static void * lib_so;
        static void (*lib_so_func)();

        lib_so = dlopen("./lib.so", RTLD_NOW | RTLD_GLOBAL);
        if (!lib_so) {
                fprintf(stderr, "dlopen: %s\n", dlerror());
                return 1;
        }
        lib_so_func = dlsym(lib_so, "lib_so_func");
        if (!lib_so_func) {
                fprintf(stderr, "dlsym: %s\n", dlerror());
                return 1;
        }
        lib_so_func();
        
        return 0;
}

----------- end main.c ------------

lib.c

----------- begin lib.c -----------
#include <stdio.h>

extern char *str;

int lib_so_func() {
        printf("%s\n", str);
        return 1;
}
----------- end lib.c -----------

0:xen:test_so$ make
gcc -fpic -DPIC -O -pipe -Wall -c lib.c
cc -shared -o lib.so lib.o
gcc -g -fpic -DPIC -Wall -o prog main.c

0:xen:test_so$ ./prog 
dlopen: ./lib.so: Undefined symbol "str"


>Fix:



>Release-Note:
>Audit-Trail:
>Unformatted:


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