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Handle dlsym(NULL, ...) properly, by searching in the caller's

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shared object.  Note, this searches _only_ that object, and not its
needed objects, in accordance with the documentation.

Also fix dlopen(NULL, ...) so that the executable's needed objects
are searched as well as the executable itself.
This commit is contained in:
John Polstra 1998-09-02 01:09:34 +00:00
parent cb690d1f0b
commit cefbc49679
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=38737
1 changed files with 26 additions and 11 deletions
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21
libexec/rtld-elf/rtld.c
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@ -22,7 +22,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rtld.c,v 1.2 1998/04/30 07:48:00 dfr Exp $
* $Id: rtld.c,v 1.3 1998/05/01 08:39:27 dfr Exp $
*/
/*
@ -126,6 +126,8 @@ static char *ld_bind_now; /* Environment variable for immediate binding */
static char *ld_debug; /* Environment variable for debugging */
static char *ld_library_path; /* Environment variable for search path */
static char *ld_tracing; /* Called from ldd to print libs */
static Obj_Entry **main_tail; /* Value of obj_tail after loading main and
its needed shared libraries */
static Obj_Entry *obj_list; /* Head of linked list of shared objects */
static Obj_Entry **obj_tail; /* Link field of last object in list */
static Obj_Entry *obj_main; /* The main program shared object */
@ -268,6 +270,7 @@ _rtld(Elf32_Word *sp, func_ptr_type *exit_proc)
dbg("loading needed objects");
if (load_needed_objects(obj_main) == -1)
die();
main_tail = obj_tail;
if (ld_tracing) { /* We're done */
trace_loaded_objects(obj_main);
@ -1239,8 +1242,9 @@ dlsym(void *handle, const char *name)
const Elf32_Sym *def;
hash = elf_hash(name);
def = NULL;
if (handle == RTLD_NEXT) {
if (handle == NULL || handle == RTLD_NEXT) {
void *retaddr;
retaddr = __builtin_return_address(0); /* __GNUC__ only */
@ -1248,19 +1252,30 @@ dlsym(void *handle, const char *name)
_rtld_error("Cannot determine caller's shared object");
return NULL;
}
def = NULL;
if (handle == NULL) /* Just the caller's shared object. */
def = symlook_obj(name, hash, obj, true);
else { /* All the shared objects after the caller's */
while ((obj = obj->next) != NULL)
if ((def = symlook_obj(name, hash, obj, true)) != NULL)
break;
}
} else {
if ((obj = dlcheck(handle)) == NULL)
return NULL;
if (obj->mainprog) {
/* Search main program and all libraries loaded by it. */
for ( ; obj != *main_tail; obj = obj->next)
if ((def = symlook_obj(name, hash, obj, true)) != NULL)
break;
} else {
/*
* XXX - This isn't correct. The search should include the whole
* DAG rooted at the given object.
*/
def = symlook_obj(name, hash, obj, true);
}
}
if (def != NULL)
return obj->relocbase + def->st_value;