>Number:         8572
>Category:       lib
>Synopsis:       dlsym() returns same address for same symbol in different modules
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    lib-bug-people (Library Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Oct  6 14:35:01 1999
>Last-Modified:
>Originator:     Ezra Story
>Organization:
	
>Release:        1.4 - i386 - current ld.elf_so from Sept 6th
>Environment:
System: NetBSD black 1.4K NetBSD 1.4K (BLACK) #14: Tue Oct 5 17:27:34 EDT 1999 ezy@black:/usr/src/cvs/syssrc/sys/arch/i386/compile/BLACK i386


>Description:

Sep  6 22:43 ld.elf_so
See PR#2791 for i386/a.out version and possible fix.
	
>How-To-Repeat:

Unpack the shar below make and run testmod.

# This is a shell archive.  Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file".  Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
#	Makefile
#	main.c
#	mod1.c
#	mod2.c
#
echo x - Makefile
sed 's/^X//' >Makefile << 'END-of-Makefile'
XCC = cc
XCFLAGS = -g $(SHARED_CFLAGS)
XSHARED_CFLAGS = -fpic
X.SUFFIXES: .so
X
XMODULE_SOURCES = mod1.c mod2.c
X
XMODULES = mod1.so mod2.so
X
XMAIN_SOURCE = main.c
X
XPROG = testmod
X
Xall: $(PROG) $(MODULES)
X
X
X
X$(PROG): $(MAIN_SOURCE)
X	$(CC) -o $(PROG) $(MAIN_SOURCE)
X
Xshar testmod.shar:     Makefile $(MODULE_SOURCES) $(MAIN_SOURCE)
X	shar Makefile $(MODULE_SOURCES) $(MAIN_SOURCE) > testmod.shar
X
X.c.so:
X	$(CC) -o tmp.o -c $(CFLAGS) $<
X	$(LD) -Bshareable -o $@ tmp.o
X
END-of-Makefile
echo x - main.c
sed 's/^X//' >main.c << 'END-of-main.c'
X#include <stdio.h>
X#include <dlfcn.h>
X
Xtypedef void (*initmodule_funcptr)(void);
X
Xvoid 
Xmain(int argc, char *argv[])
X{
X    void *module;
X    initmodule_funcptr moduleInit;
X
X    printf("Opening modules...\n");
X
X    /* Open and initialize 1st module */
X    module = dlopen("./mod1.so", DL_LAZY);
X    if (module == NULL) {
X       perror("dlopen(mod1.so)");
X       exit(1);
X    }
X    moduleInit = dlsym(module, "init_module");
X    if (moduleInit == NULL) {
X       perror("dlsym()");
X       exit(1);
X    }
X    (*moduleInit)();
X    
X
X    /* Open and initialize 2n module */
X    module = dlopen("./mod2.so", DL_LAZY);
X    if (module == NULL) {
X       perror("dlopen(mod2.so)");
X       exit(1);
X    }
X    moduleInit = dlsym(module, "init_module");
X    if (moduleInit == NULL) {
X       perror("dlsym()");
X       exit(1);
X    }
X    (*moduleInit)();
X    
X    exit(0);
X}
X
X
END-of-main.c
echo x - mod1.c
sed 's/^X//' >mod1.c << 'END-of-mod1.c'
X#include <stdio.h>
X
Xvoid
Xinit_module(void)
X{
X    printf("init module 1\n");
X}
X
X
END-of-mod1.c
echo x - mod2.c
sed 's/^X//' >mod2.c << 'END-of-mod2.c'
X#include <stdio.h>
X
Xvoid
Xinit_module(void)
X{
X    printf("init module 2\n");
X}
X
X
X
END-of-mod2.c
exit

>Fix:
no workaround. PR#2791?

>Audit-Trail:
>Unformatted: