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* include/link.h (struct link_map): Remove l_opencount. Add l_removed.

Browse Source 
Change type of l_idx to int.
	* elf/dl-close.c: Basically rewrite.  Do not use l_opencount to
	determine whether a DSO has to be unloaded.  Instead compute this
	in this function.
	* elf/dl-deps.c: No need to manipulate l_opencount anymore.
	* elf/dl-lookup.c: Likewise.
	* elf/rtld.c: Likewise
	* elf/dl-open.c: Likewise.  Use l_init_called to determine whether
	object was just loaded.
	* elf/dl-fini.c: Bump l_direct_opencount instead of l_opencount.
	* elf/dl-load.c (_dl_map_object_from_fd): Do not recognize DSO which
	is about to be unloaded as a match.
	(_dl_map_object): Likewise.
	* elf/do-lookup.h (do_lookup_x): Do not look into DSO which is about
	to be unloaded.
	* elf/circleload1.c: Don't use l_opencount anymore.
	* elf/neededtest.c: Likewise.
	* elf/neededtest2.c: Likewise.
	* elf/neededtest3.c: Likewise.
	* elf/neededtest4.c: Likewise.
	* elf/unload.c: Likewise.
	* elf/unload2.c: Likewise.
	* elf/loadtest.c: Likewise.

	* elf/rtld.c: Preloading errors are now never fatal.

2005-03-08  Jakub Jelinek  <jakub@redhat.com>

	* elf/Makefile: Add rules to build and run unload5 test.
	* elf/unload5.c: New file.

2005-03-08  Jakub Jelinek  <jakub@redhat.com>

	* elf/Makefile: Add rules to build and run unload4 test.
	* elf/unload4.c: New file.
	* elf/unload4mod1.c: New file.
	* elf/unload4mod2.c: New file.
	* elf/unload4mod3.c: New file.
	* elf/unload4mod4.c: New file.
This commit is contained in:
Ulrich Drepper 2005-03-18 11:11:42 +00:00
parent 193af754dc
commit 20fe49b93a
19 changed files with 359 additions and 411 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
ChangeLog
View File

@ -1,3 +1,46 @@
2005-03-18 Ulrich Drepper <drepper@redhat.com>
* include/link.h (struct link_map): Remove l_opencount. Add l_removed.
Change type of l_idx to int.
* elf/dl-close.c: Basically rewrite. Do not use l_opencount to
determine whether a DSO has to be unloaded. Instead compute this
in this function.
* elf/dl-deps.c: No need to manipulate l_opencount anymore.
* elf/dl-lookup.c: Likewise.
* elf/rtld.c: Likewise
* elf/dl-open.c: Likewise. Use l_init_called to determine whether
object was just loaded.
* elf/dl-fini.c: Bump l_direct_opencount instead of l_opencount.
* elf/dl-load.c (_dl_map_object_from_fd): Do not recognize DSO which
is about to be unloaded as a match.
(_dl_map_object): Likewise.
* elf/do-lookup.h (do_lookup_x): Do not look into DSO which is about
to be unloaded.
* elf/circleload1.c: Don't use l_opencount anymore.
* elf/neededtest.c: Likewise.
* elf/neededtest2.c: Likewise.
* elf/neededtest3.c: Likewise.
* elf/neededtest4.c: Likewise.
* elf/unload.c: Likewise.
* elf/unload2.c: Likewise.
* elf/loadtest.c: Likewise.
* elf/rtld.c: Preloading errors are now never fatal.
2005-03-08 Jakub Jelinek <jakub@redhat.com>
* elf/Makefile: Add rules to build and run unload5 test.
* elf/unload5.c: New file.
2005-03-08 Jakub Jelinek <jakub@redhat.com>
* elf/Makefile: Add rules to build and run unload4 test.
* elf/unload4.c: New file.
* elf/unload4mod1.c: New file.
* elf/unload4mod2.c: New file.
* elf/unload4mod3.c: New file.
* elf/unload4mod4.c: New file.
2005-03-17 Roland McGrath <roland@redhat.com>
* nscd/aicache.c (addhstaiX): Tweak type to avoid warning.

16
elf/Makefile
View File

@ -85,6 +85,7 @@ distribute := rtld-Rules \
check-textrel.c dl-sysdep.h test-dlopenrpathmod.c \
tst-deep1mod1.c tst-deep1mod2.c tst-deep1mod3.c \
unload3mod1.c unload3mod2.c unload3mod3.c unload3mod4.c \
unload4mod1.c unload4mod2.c unload4mod3.c unload4mod4.c \
tst-auditmod1.c
CFLAGS-dl-runtime.c = -fexceptions -fasynchronous-unwind-tables
@ -160,7 +161,7 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
tst-tls10 tst-tls11 tst-tls12 tst-tls13 tst-tls14 tst-align \
tst-align2 $(tests-execstack-$(have-z-execstack)) tst-dlmodcount \
tst-dlopenrpath tst-deep1 tst-dlmopen1 tst-dlmopen2 tst-dlmopen3 \
unload3 tst-audit1 tst-global1
unload3 unload4 unload5 tst-audit1 tst-global1
# reldep9
test-srcs = tst-pathopt
tests-vis-yes = vismain
@ -196,7 +197,8 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
$(modules-execstack-$(have-z-execstack)) \
tst-dlopenrpathmod tst-deep1mod1 tst-deep1mod2 tst-deep1mod3 \
tst-dlmopen1mod tst-auditmod1 \
unload3mod1 unload3mod2 unload3mod3 unload3mod4
unload3mod1 unload3mod2 unload3mod3 unload3mod4 \
unload4mod1 unload4mod2 unload4mod3 unload4mod4
ifeq (yes,$(have-initfini-array))
modules-names += tst-array2dep
endif
@ -431,6 +433,8 @@ $(objpfx)reldep9mod3.so: $(objpfx)reldep9mod1.so $(objpfx)reldep9mod2.so
$(objpfx)unload3mod1.so: $(objpfx)unload3mod3.so
$(objpfx)unload3mod2.so: $(objpfx)unload3mod3.so
$(objpfx)unload3mod3.so: $(objpfx)unload3mod4.so
$(objpfx)unload4mod1.so: $(objpfx)unload4mod2.so $(objpfx)unload4mod3.so
$(objpfx)unload4mod2.so: $(objpfx)unload4mod4.so $(objpfx)unload4mod3.so
LDFLAGS-tst-tlsmod5.so = -nostdlib
LDFLAGS-tst-tlsmod6.so = -nostdlib
@ -471,6 +475,7 @@ circlemod3a.so-no-z-defs = yes
reldep8mod2.so-no-z-defs = yes
reldep9mod1.so-no-z-defs = yes
unload3mod4.so-no-z-defs = yes
unload4mod1.so-no-z-defs = yes
# filtmod1.so has a special rule
$(filter-out $(objpfx)filtmod1.so, $(test-modules)): $(objpfx)%.so: $(objpfx)%.os
@ -691,6 +696,13 @@ $(objpfx)unload3: $(libdl)
$(objpfx)unload3.out: $(objpfx)unload3mod1.so $(objpfx)unload3mod2.so \
$(objpfx)unload3mod3.so $(objpfx)unload3mod4.so
$(objpfx)unload4: $(libdl)
$(objpfx)unload4.out: $(objpfx)unload4mod1.so $(objpfx)unload4mod3.so
$(objpfx)unload5: $(libdl)
$(objpfx)unload5.out: $(objpfx)unload3mod1.so $(objpfx)unload3mod2.so \
$(objpfx)unload3mod3.so $(objpfx)unload3mod4.so
ifdef libdl
$(objpfx)tst-tls9-static: $(common-objpfx)dlfcn/libdl.a
$(objpfx)tst-tls9-static.out: $(objpfx)tst-tlsmod5.so $(objpfx)tst-tlsmod6.so

2
elf/circleload1.c
View File

@ -27,7 +27,7 @@ check_loaded_objects (const char **loaded)
for (lm = _r_debug.r_map; lm; lm = lm->l_next)
{
if (lm->l_name && lm->l_name[0])
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_opencount);
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
if (lm->l_type == lt_loaded && lm->l_name)
{
int match = 0;

347
elf/dl-close.c
View File

@ -102,19 +102,9 @@ remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp,
void
_dl_close (void *_map)
{
struct reldep_list
{
struct link_map **rellist;
unsigned int nrellist;
unsigned int nhandled;
struct reldep_list *next;
bool handled[0];
} *reldeps = NULL;
struct link_map **list;
struct link_map *map = _map;
Lmid_t ns = map->l_ns;
unsigned int i;
unsigned int *new_opencount;
#ifdef USE_TLS
bool any_tls = false;
#endif
@ -125,160 +115,127 @@ _dl_close (void *_map)
/* Nope. Do nothing. */
return;
if (__builtin_expect (map->l_opencount, 1) == 0)
if (__builtin_expect (map->l_direct_opencount, 1) == 0)
GLRO(dl_signal_error) (0, map->l_name, NULL, N_("shared object not open"));
/* Acquire the lock. */
__rtld_lock_lock_recursive (GL(dl_load_lock));
/* One less direct use. */
assert (map->l_direct_opencount > 0);
--map->l_direct_opencount;
/* Decrement the reference count. */
if (map->l_opencount > 1 || map->l_type != lt_loaded)
if (map->l_direct_opencount > 1 || map->l_type != lt_loaded)
{
/* Decrement the object's reference counter, not the dependencies'. */
--map->l_opencount;
/* There are still references to this object. Do nothing more. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
_dl_debug_printf ("\nclosing file=%s; opencount=%u\n",
map->l_name, map->l_opencount);
/* If the direct use counter reaches zero we have to decrement
all the dependencies' usage counter. */
if (map->l_direct_opencount == 0)
for (i = 1; i < map->l_searchlist.r_nlist; ++i)
--map->l_searchlist.r_list[i]->l_opencount;
_dl_debug_printf ("\nclosing file=%s; direct_opencount=%u\n",
map->l_name, map->l_direct_opencount);
__rtld_lock_unlock_recursive (GL(dl_load_lock));
return;
}
list = map->l_initfini;
#define NWORDS(n) (((n) + 8 * sizeof (unsigned long int) - 1) \
/ (sizeof (unsigned long int)))
#define SETBIT(a, n) a[(n) / sizeof (unsigned long int)] \
|= 1 << ((n) % (sizeof (unsigned long int)))
#define ISSET(a, n) (a[(n) / sizeof (unsigned long int)] \
& 1 << ((n) % (sizeof (unsigned long int))))
const unsigned int nloaded = GL(dl_ns)[ns]._ns_nloaded;
unsigned long int used[NWORDS (nloaded)];
unsigned long int done[NWORDS (nloaded)];
struct link_map *maps[nloaded];
/* Compute the new l_opencount values. */
i = map->l_searchlist.r_nlist;
if (__builtin_expect (i == 0, 0))
/* This can happen if we handle relocation dependencies for an
object which wasn't loaded directly. */
for (i = 1; list[i] != NULL; ++i)
;
unsigned int nopencount = i;
new_opencount = (unsigned int *) alloca (i * sizeof (unsigned int));
for (i = 0; list[i] != NULL; ++i)
/* Run over the list and assign indeces to the link maps and enter
them into the MAPS array. */
int idx = 0;
for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
{
list[i]->l_idx = i;
new_opencount[i] = list[i]->l_opencount;
l->l_idx = idx;
maps[idx] = l;
++idx;
}
--new_opencount[0];
for (i = 1; list[i] != NULL; ++i)
if ((list[i]->l_flags_1 & DF_1_NODELETE) == 0
/* Decrement counter. */
&& (assert (new_opencount[i] > 0), --new_opencount[i] == 0))
{
void mark_removed (struct link_map *remmap)
{
/* Test whether this object was also loaded directly. */
if (remmap->l_searchlist.r_list != NULL
&& remmap->l_direct_opencount > 0)
{
/* In this case we have to decrement all the dependencies of
this object. They are all in MAP's dependency list. */
unsigned int j;
struct link_map **dep_list = remmap->l_searchlist.r_list;
assert (idx == nloaded);
for (j = 1; j < remmap->l_searchlist.r_nlist; ++j)
if (! (dep_list[j]->l_flags_1 & DF_1_NODELETE)
|| ! dep_list[j]->l_init_called)
/* Prepare the bitmaps. */
memset (used, '\0', sizeof (used));
memset (done, '\0', sizeof (done));
/* Keep track of the lowest index link map we have covered already. */
int done_index = -1;
while (++done_index < nloaded)
{
struct link_map *l = maps[done_index];
if (ISSET (done, done_index))
/* Already handled. */
continue;
/* Check whether this object is still used. */
if (l->l_type == lt_loaded
&& l->l_direct_opencount == 0
&& (l->l_flags_1 & DF_1_NODELETE) == 0
&& !ISSET (used, done_index))
continue;
/* We need this object and we handle it now. */
SETBIT (done, done_index);
SETBIT (used, done_index);
/* Mark all dependencies as used. */
if (l->l_initfini != NULL)
{
struct link_map **lp = &l->l_initfini[1];
while (*lp != NULL)
{
assert ((*lp)->l_idx >= 0 && (*lp)->l_idx < nloaded);
if (!ISSET (used, (*lp)->l_idx))
{
assert (dep_list[j]->l_idx < map->l_searchlist.r_nlist);
assert (new_opencount[dep_list[j]->l_idx] > 0);
if (--new_opencount[dep_list[j]->l_idx] == 0)
{
assert (dep_list[j]->l_type == lt_loaded);
mark_removed (dep_list[j]);
}
SETBIT (used, (*lp)->l_idx);
if ((*lp)->l_idx - 1 < done_index)
done_index = (*lp)->l_idx - 1;
}
}
if (remmap->l_reldeps != NULL)
++lp;
}
}
/* And the same for relocation dependencies. */
if (l->l_reldeps != NULL)
for (unsigned int j = 0; j < l->l_reldepsact; ++j)
{
struct link_map *jmap = l->l_reldeps[j];
assert (jmap->l_idx >= 0 && jmap->l_idx < nloaded);
if (!ISSET (used, jmap->l_idx))
{
unsigned int j;
for (j = 0; j < remmap->l_reldepsact; ++j)
{
struct link_map *depmap = remmap->l_reldeps[j];
/* Find out whether this object is in our list. */
if (depmap->l_idx < nopencount
&& list[depmap->l_idx] == depmap)
{
/* Yes, it is. If is has a search list, make a
recursive call to handle this. */
if (depmap->l_searchlist.r_list != NULL)
{
assert (new_opencount[depmap->l_idx] > 0);
if (--new_opencount[depmap->l_idx] == 0)
{
/* This one is now gone, too. */
assert (depmap->l_type == lt_loaded);
mark_removed (depmap);
}
}
else
{
/* Otherwise we have to handle the dependency
deallocation here. */
unsigned int k;
for (k = 0; depmap->l_initfini[k] != NULL; ++k)
{
struct link_map *rl = depmap->l_initfini[k];
if (rl->l_idx < nopencount
&& list[rl->l_idx] == rl)
{
assert (new_opencount[rl->l_idx] > 0);
if (--new_opencount[rl->l_idx] == 0)
{
/* Another module to remove. */
assert (rl->l_type == lt_loaded);
mark_removed (rl);
}
}
else
{
assert (rl->l_opencount > 0);
if (--rl->l_opencount == 0)
mark_removed (rl);
}
}
}
}
}
SETBIT (used, jmap->l_idx);
if (jmap->l_idx - 1 < done_index)
done_index = jmap->l_idx - 1;
}
}
mark_removed (list[i]);
}
assert (new_opencount[0] == 0);
}
/* Call all termination functions at once. */
#ifdef SHARED
bool do_audit = GLRO(dl_naudit) > 0 && !GL(dl_ns)[ns]._ns_loaded->l_auditing;
#endif
for (i = 0; list[i] != NULL; ++i)
bool unload_any = false;
unsigned int first_loaded = ~0;
for (i = 0; i < nloaded; ++i)
{
struct link_map *imap = list[i];
struct link_map *imap = maps[i];
/* All elements must be in the same namespace. */
assert (imap->l_ns == ns);
if (new_opencount[i] == 0 && imap->l_type == lt_loaded
&& (imap->l_flags_1 & DF_1_NODELETE) == 0)
if (!ISSET (used, i))
{
assert (imap->l_type == lt_loaded
&& (imap->l_flags_1 & DF_1_NODELETE) == 0);
/* Call its termination function. Do not do it for
half-cooked objects. */
if (imap->l_init_called)
@ -324,42 +281,59 @@ _dl_close (void *_map)
}
#endif
/* This object must not be used anymore. We must remove the
reference from the scope. */
unsigned int j;
struct link_map **searchlist = map->l_searchlist.r_list;
unsigned int nsearchlist = map->l_searchlist.r_nlist;
/* This object must not be used anymore. */
imap->l_removed = 1;
#ifndef NDEBUG
bool found = false;
#endif
for (j = 0; j < nsearchlist; ++j)
if (imap == searchlist[j])
{
/* This is the object to remove. Copy all the
following ones. */
while (++j < nsearchlist)
searchlist[j - 1] = searchlist[j];
/* We indeed have an object to remove. */
unload_any = true;
searchlist[j - 1] = NULL;
--map->l_searchlist.r_nlist;
#ifndef NDEBUG
found = true;
#endif
break;
}
assert (found);
/* Remember where the first dynamically loaded object is. */
if (i < first_loaded)
first_loaded = i;
}
/* Else ISSET (used, i). */
else if (imap->l_type == lt_loaded)
{
if (imap->l_searchlist.r_list == NULL
&& imap->l_initfini != NULL)
{
/* The object is still used. But the object we are
unloading right now is responsible for loading it. If
the current object does not have it's own scope yet we
have to create one. This has to be done before running
the finalizers.
/* Store the new l_opencount value. */
imap->l_opencount = new_opencount[i];
To do this count the number of dependencies. */
unsigned int cnt;
for (cnt = 1; imap->l_initfini[cnt] != NULL; ++cnt)
;
/* Just a sanity check. */
assert (imap->l_type == lt_loaded || imap->l_opencount > 0);
/* We simply reuse the l_initfini list. */
imap->l_searchlist.r_list = &imap->l_initfini[cnt + 1];
imap->l_searchlist.r_nlist = cnt;
for (cnt = 0; imap->l_scope[cnt] != NULL; ++cnt)
if (imap->l_scope[cnt] == &map->l_searchlist)
{
imap->l_scope[cnt] = &imap->l_searchlist;
break;
}
}
/* The loader is gone, so mark the object as not having one. */
if (imap->l_loader != NULL && !ISSET (used, imap->l_loader->l_idx))
imap->l_loader = NULL;
/* Remember where the first dynamically loaded object is. */
if (i < first_loaded)
first_loaded = i;
}
}
/* If there are no objects to unload, do nothing further. */
if (!unload_any)
goto out;
#ifdef SHARED
/* Auditing checkpoint: we will start deleting objects. */
if (__builtin_expect (do_audit, 0))
@ -393,12 +367,12 @@ _dl_close (void *_map)
/* Check each element of the search list to see if all references to
it are gone. */
for (i = 0; list[i] != NULL; ++i)
for (i = first_loaded; i < nloaded; ++i)
{
struct link_map *imap = list[i];
if (imap->l_opencount == 0 && imap->l_type == lt_loaded)
struct link_map *imap = maps[i];
if (!ISSET (used, i))
{
struct libname_list *lnp;
assert (imap->l_type == lt_loaded);
/* That was the last reference, and this was a dlopen-loaded
object. We can unmap it. */
@ -527,34 +501,7 @@ _dl_close (void *_map)
if (imap->l_origin != (char *) -1)
free ((char *) imap->l_origin);
/* If the object has relocation dependencies save this
information for latter. */
if (__builtin_expect (imap->l_reldeps != NULL, 0))
{
struct reldep_list *newrel;
newrel = (struct reldep_list *) alloca (sizeof (*reldeps)
+ (imap->l_reldepsact
* sizeof (bool)));
newrel->rellist = imap->l_reldeps;
newrel->nrellist = imap->l_reldepsact;
newrel->next = reldeps;
newrel->nhandled = imap->l_reldepsact;
unsigned int j;
for (j = 0; j < imap->l_reldepsact; ++j)
{
/* Find out whether this object is in our list. */
if (imap->l_reldeps[j]->l_idx < nopencount
&& list[imap->l_reldeps[j]->l_idx] == imap->l_reldeps[j])
/* Yes, it is. */
newrel->handled[j] = true;
else
newrel->handled[j] = false;
}
reldeps = newrel;
}
free (imap->l_reldeps);
/* Print debugging message. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
@ -564,7 +511,8 @@ _dl_close (void *_map)
/* This name always is allocated. */
free (imap->l_name);
/* Remove the list with all the names of the shared object. */
lnp = imap->l_libname;
struct libname_list *lnp = imap->l_libname;
do
{
struct libname_list *this = lnp;
@ -575,8 +523,7 @@ _dl_close (void *_map)
while (lnp != NULL);
/* Remove the searchlists. */
if (imap != map)
free (imap->l_initfini);
free (imap->l_initfini);
/* Remove the scope array if we allocated it. */
if (imap->l_scope != imap->l_scope_mem)
@ -630,26 +577,8 @@ _dl_close (void *_map)
r->r_state = RT_CONSISTENT;
_dl_debug_state ();
/* Now we can perhaps also remove the modules for which we had
dependencies because of symbol lookup. */
while (__builtin_expect (reldeps != NULL, 0))
{
while (reldeps->nrellist-- > 0)
/* Some of the relocation dependencies might be on the
dependency list of the object we are closing right now.
They were already handled. Do not close them again. */
if (reldeps->nrellist < reldeps->nhandled
&& ! reldeps->handled[reldeps->nrellist])
_dl_close (reldeps->rellist[reldeps->nrellist]);
free (reldeps->rellist);
reldeps = reldeps->next;
}
free (list);
/* Release the lock. */
out:
__rtld_lock_unlock_recursive (GL(dl_load_lock));
}

2
elf/dl-deps.c
View File

@ -566,8 +566,6 @@ Filters not supported with LD_TRACE_PRELINKING"));
{
/* A direct or transitive dependency is also on the list
of relocation dependencies. Remove the latter. */
--map->l_reldeps[i]->l_opencount;
for (j = i + 1; j < map->l_reldepsact; ++j)
map->l_reldeps[j - 1] = map->l_reldeps[j];

8
elf/dl-fini.c
View File

@ -98,9 +98,9 @@ _dl_fini (void)
maps[i++] = l;
/* Bump l_opencount of all objects so that they are not
dlclose()ed from underneath us. */
++l->l_opencount;
/* Bump l_direct_opencount of all objects so that they are
not dlclose()ed from underneath us. */
++l->l_direct_opencount;
}
assert (cnt != LM_ID_BASE || i == nloaded);
assert (cnt == LM_ID_BASE || i == nloaded || i == nloaded - 1);
@ -237,7 +237,7 @@ _dl_fini (void)
}
/* Correct the previous increment. */
--l->l_opencount;
--l->l_direct_opencount;
}
}

5
elf/dl-load.c
View File

@ -849,7 +849,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
/* Look again to see if the real name matched another already loaded. */
for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
if (l->l_ino == st.st_ino && l->l_dev == st.st_dev)
if (l->l_removed == 0 && l->l_ino == st.st_ino && l->l_dev == st.st_dev)
{
/* The object is already loaded.
Just bump its reference count and return it. */
@ -1914,7 +1914,8 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
/* If the requested name matches the soname of a loaded object,
use that object. Elide this check for names that have not
yet been opened. */
if (__builtin_expect (l->l_faked, 0) != 0)
if (__builtin_expect (l->l_faked, 0) != 0
|| __builtin_expect (l->l_removed, 0) != 0)
continue;
if (!_dl_name_match_p (name, l))
{

19
elf/dl-lookup.c
View File

@ -91,11 +91,6 @@ add_dependency (struct link_map *undef_map, struct link_map *map)
/* Make sure nobody can unload the object while we are at it. */
__rtld_lock_lock_recursive (GL(dl_load_lock));
/* Don't create cross-reference between modules which are
dynamically loaded by the same dlopen() call. */
if (undef_map->l_opencount == 0 && map->l_opencount == 0)
goto out;
/* Avoid references to objects which cannot be unloaded anyway. */
if (map->l_type != lt_loaded
|| (map->l_flags_1 & DF_1_NODELETE) != 0)
@ -107,7 +102,6 @@ add_dependency (struct link_map *undef_map, struct link_map *map)
if (undef_map->l_type != lt_loaded
|| (undef_map->l_flags_1 & DF_1_NODELETE) != 0)
{
++map->l_opencount;
map->l_flags_1 |= DF_1_NODELETE;
goto out;
}
@ -172,19 +166,6 @@ add_dependency (struct link_map *undef_map, struct link_map *map)
if (__builtin_expect (act < undef_map->l_reldepsmax, 1))
undef_map->l_reldeps[undef_map->l_reldepsact++] = map;
if (map->l_searchlist.r_list != NULL)
/* And increment the counter in the referenced object. */
++map->l_opencount;
else
/* We have to bump the counts for all dependencies since so far
this object was only a normal or transitive dependency.
Now it might be closed with _dl_close() directly. */
for (list = map->l_initfini; *list != NULL; ++list)
++(*list)->l_opencount;
/* As if it is opened through _dl_open. */
++map->l_direct_opencount;
/* Display information if we are debugging. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
_dl_debug_printf ("\

169
elf/dl-open.c
View File

@ -281,23 +281,14 @@ dl_open_worker (void *a)
{
/* Let the user know about the opencount. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
_dl_debug_printf ("opening file=%s [%lu]; opencount=%u\n\n",
new->l_name, new->l_ns, new->l_opencount + 1);
_dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
new->l_name, new->l_ns, new->l_direct_opencount + 1);
/* If the user requested the object to be in the global namespace
but it is not so far, add it now. */
if ((mode & RTLD_GLOBAL) && new->l_global == 0)
(void) add_to_global (new);
if (new->l_direct_opencount == 1)
/* This is the only direct reference. Increment all the
dependencies' reference counter. */
for (i = 0; i < new->l_searchlist.r_nlist; ++i)
++new->l_searchlist.r_list[i]->l_opencount;
else
/* Increment just the reference counter of the object. */
++new->l_opencount;
assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
return;
@ -386,94 +377,92 @@ dl_open_worker (void *a)
l = l->l_prev;
}
/* Increment the open count for all dependencies. If the file is
not loaded as a dependency here add the search list of the newly
loaded object to the scope. */
/* If the file is not loaded now as a dependency, add the search
list of the newly loaded object to the scope. */
for (i = 0; i < new->l_searchlist.r_nlist; ++i)
if (++new->l_searchlist.r_list[i]->l_opencount > 1
&& new->l_real->l_searchlist.r_list[i]->l_type == lt_loaded)
{
struct link_map *imap = new->l_searchlist.r_list[i];
struct r_scope_elem **runp = imap->l_scope;
size_t cnt = 0;
{
struct link_map *imap = new->l_searchlist.r_list[i];
while (*runp != NULL)
{
/* This can happen if imap was just loaded, but during
relocation had l_opencount bumped because of relocation
dependency. Avoid duplicates in l_scope. */
if (__builtin_expect (*runp == &new->l_searchlist, 0))
break;
/* If the initializer has been called already, the object has
not been loaded here and now. */
if (imap->l_init_called && imap->l_type == lt_loaded)
{
struct r_scope_elem **runp = imap->l_scope;
size_t cnt = 0;
++cnt;
++runp;
}
while (*runp != NULL)
{
++cnt;
++runp;
}
if (*runp != NULL)
/* Avoid duplicates. */
continue;
if (*runp != NULL)
/* Avoid duplicates. */
continue;
if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))
{
/* The 'r_scope' array is too small. Allocate a new one
dynamically. */
struct r_scope_elem **newp;
size_t new_size = imap->l_scope_max * 2;
if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))
{
/* The 'r_scope' array is too small. Allocate a new one
dynamically. */
struct r_scope_elem **newp;
size_t new_size = imap->l_scope_max * 2;
if (imap->l_scope == imap->l_scope_mem)
{
newp = (struct r_scope_elem **)
malloc (new_size * sizeof (struct r_scope_elem *));
if (newp == NULL)
_dl_signal_error (ENOMEM, "dlopen", NULL,
N_("cannot create scope list"));
imap->l_scope = memcpy (newp, imap->l_scope,
cnt * sizeof (imap->l_scope[0]));
}
else
{
newp = (struct r_scope_elem **)
realloc (imap->l_scope,
new_size * sizeof (struct r_scope_elem *));
if (newp == NULL)
_dl_signal_error (ENOMEM, "dlopen", NULL,
N_("cannot create scope list"));
imap->l_scope = newp;
}
if (imap->l_scope == imap->l_scope_mem)
{
newp = (struct r_scope_elem **)
malloc (new_size * sizeof (struct r_scope_elem *));
if (newp == NULL)
_dl_signal_error (ENOMEM, "dlopen", NULL,
N_("cannot create scope list"));
imap->l_scope = memcpy (newp, imap->l_scope,
cnt * sizeof (imap->l_scope[0]));
}
else
{
newp = (struct r_scope_elem **)
realloc (imap->l_scope,
new_size * sizeof (struct r_scope_elem *));
if (newp == NULL)
_dl_signal_error (ENOMEM, "dlopen", NULL,
N_("cannot create scope list"));
imap->l_scope = newp;
}
imap->l_scope_max = new_size;
}
imap->l_scope_max = new_size;
}
imap->l_scope[cnt++] = &new->l_searchlist;
imap->l_scope[cnt] = NULL;
}
imap->l_scope[cnt++] = &new->l_searchlist;
imap->l_scope[cnt] = NULL;
}
#if USE_TLS
else if (new->l_searchlist.r_list[i]->l_opencount == 1
/* Only if the module defines thread local data. */
&& __builtin_expect (new->l_searchlist.r_list[i]->l_tls_blocksize
> 0, 0))
{
/* Now that we know the object is loaded successfully add
modules containing TLS data to the slot info table. We
might have to increase its size. */
_dl_add_to_slotinfo (new->l_searchlist.r_list[i]);
/* Only add TLS memory if this object is loaded now and
therefore is not yet initialized. */
else if (! imap->l_init_called
/* Only if the module defines thread local data. */
&& __builtin_expect (imap->l_tls_blocksize > 0, 0))
{
/* Now that we know the object is loaded successfully add
modules containing TLS data to the slot info table. We
might have to increase its size. */
_dl_add_to_slotinfo (imap);
if (new->l_searchlist.r_list[i]->l_need_tls_init)
{
new->l_searchlist.r_list[i]->l_need_tls_init = 0;
if (imap->l_need_tls_init)
{
imap->l_need_tls_init = 0;
# ifdef SHARED
/* Update the slot information data for at least the
generation of the DSO we are allocating data for. */
_dl_update_slotinfo (new->l_searchlist.r_list[i]->l_tls_modid);
/* Update the slot information data for at least the
generation of the DSO we are allocating data for. */
_dl_update_slotinfo (imap->l_tls_modid);
# endif
GL(dl_init_static_tls) (new->l_searchlist.r_list[i]);
assert (new->l_searchlist.r_list[i]->l_need_tls_init == 0);
}
GL(dl_init_static_tls) (imap);
assert (imap->l_need_tls_init == 0);
}
/* We have to bump the generation counter. */
any_tls = true;
}
/* We have to bump the generation counter. */
any_tls = true;
}
}
/* Bump the generation number if necessary. */
if (any_tls && __builtin_expect (++GL(dl_tls_generation) == 0, 0))
@ -504,8 +493,8 @@ TLS generation counter wrapped! Please report this."));
/* Let the user know about the opencount. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
_dl_debug_printf ("opening file=%s [%lu]; opencount=%u\n\n",
new->l_name, new->l_ns, new->l_opencount);
_dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
new->l_name, new->l_ns, new->l_direct_opencount);
}
@ -581,12 +570,6 @@ no more namespaces available for dlmopen()"));
state if relocation failed, for example. */
if (args.map)
{
/* Increment open counters for all objects since this
sometimes has not happened yet. */
if (args.map->l_searchlist.r_list[0]->l_opencount == 0)
for (unsigned int i = 0; i < args.map->l_searchlist.r_nlist; ++i)
++args.map->l_searchlist.r_list[i]->l_opencount;
#ifdef USE_TLS
/* Maybe some of the modules which were loaded use TLS.
Since it will be removed in the following _dl_close call

4
elf/do-lookup.h
View File

@ -52,6 +52,10 @@ do_lookup_x (const char *undef_name, unsigned long int hash,
if ((type_class & ELF_RTYPE_CLASS_COPY) && map->l_type == lt_executable)
continue;
/* Do not look into objects which are going to be removed. */
if (map->l_removed)
continue;
/* Print some debugging info if wanted. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SYMBOLS, 0))
_dl_debug_printf ("symbol=%s; lookup in file=%s [%lu]\n",

8
elf/loadtest.c
View File

@ -73,8 +73,8 @@ static const struct
#define OUT \
for (map = _r_debug.r_map; map != NULL; map = map->l_next) \
if (map->l_type == lt_loaded) \
printf ("name = \"%s\", opencount = %d\n", \
map->l_name, (int) map->l_opencount); \
printf ("name = \"%s\", direct_opencount = %d\n", \
map->l_name, (int) map->l_direct_opencount); \
fflush (stdout)
@ -183,8 +183,8 @@ main (int argc, char *argv[])
for (map = _r_debug.r_map; map != NULL; map = map->l_next)
if (map->l_type == lt_loaded)
{
printf ("name = \"%s\", opencount = %d\n",
map->l_name, (int) map->l_opencount);
printf ("name = \"%s\", direct_opencount = %d\n",
map->l_name, (int) map->l_direct_opencount);
result = 1;
}

2
elf/neededtest.c
View File

@ -27,7 +27,7 @@ check_loaded_objects (const char **loaded)
for (lm = _r_debug.r_map; lm; lm = lm->l_next)
{
if (lm->l_name && lm->l_name[0])
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_opencount);
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
if (lm->l_type == lt_loaded && lm->l_name)
{
int match = 0;

2
elf/neededtest2.c
View File

@ -27,7 +27,7 @@ check_loaded_objects (const char **loaded)
for (lm = _r_debug.r_map; lm; lm = lm->l_next)
{
if (lm->l_name && lm->l_name[0])
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_opencount);
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
if (lm->l_type == lt_loaded && lm->l_name)
{
int match = 0;

2
elf/neededtest3.c
View File

@ -27,7 +27,7 @@ check_loaded_objects (const char **loaded)
for (lm = _r_debug.r_map; lm; lm = lm->l_next)
{
if (lm->l_name && lm->l_name[0])
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_opencount);
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
if (lm->l_type == lt_loaded && lm->l_name)
{
int match = 0;

2
elf/neededtest4.c
View File

@ -27,7 +27,7 @@ check_loaded_objects (const char **loaded)
for (lm = _r_debug.r_map; lm; lm = lm->l_next)
{
if (lm->l_name && lm->l_name[0])
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_opencount);
printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
if (lm->l_type == lt_loaded && lm->l_name)
{
int match = 0;

126
elf/rtld.c
View File

@ -267,7 +267,6 @@ _dl_start_final (void *arg, struct dl_start_final_info *info)
#endif
_dl_setup_hash (&GL(dl_rtld_map));
GL(dl_rtld_map).l_real = &GL(dl_rtld_map);
GL(dl_rtld_map).l_opencount = 1;
GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin;
GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end;
GL(dl_rtld_map).l_text_end = (ElfW(Addr)) _etext;
@ -764,14 +763,48 @@ _dl_initial_error_catch_tsd (void)
}
#endif
static unsigned int
do_preload (char *fname, struct link_map *main_map, const char *where)
{
const char *objname;
const char *err_str = NULL;
struct map_args args;
args.str = fname;
args.loader = main_map;
args.is_preloaded = 1;
args.mode = 0;
unsigned int old_nloaded = GL(dl_ns)[LM_ID_BASE]._ns_nloaded;
(void) _dl_catch_error (&objname, &err_str, map_doit, &args);
if (__builtin_expect (err_str != NULL, 0))
{
_dl_error_printf ("\
ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
fname, where);
/* No need to call free, this is still before
the libc's malloc is used. */
}
else if (GL(dl_ns)[LM_ID_BASE]._ns_nloaded != old_nloaded)
/* It is no duplicate. */
return 1;
/* Nothing loaded. */
return 0;
}
#if defined SHARED && defined _LIBC_REENTRANT \
&& defined __rtld_lock_default_lock_recursive
static void rtld_lock_default_lock_recursive (void *lock)
static void
rtld_lock_default_lock_recursive (void *lock)
{
__rtld_lock_default_lock_recursive (lock);
}
static void rtld_lock_default_unlock_recursive (void *lock)
static void
rtld_lock_default_unlock_recursive (void *lock)
{
__rtld_lock_default_unlock_recursive (lock);
}
@ -792,8 +825,6 @@ dl_main (const ElfW(Phdr) *phdr,
{
const ElfW(Phdr) *ph;
enum mode mode;
struct link_map **preloads;
unsigned int npreloads;
struct link_map *main_map;
size_t file_size;
char *file;
@ -1024,8 +1055,6 @@ of this helper program; chances are you did not intend to run this program.\n\
main_map->l_text_end = 0;
/* Perhaps the executable has no PT_LOAD header entries at all. */
main_map->l_map_start = ~0;
/* We opened the file, account for it. */
++main_map->l_opencount;
/* And it was opened directly. */
++main_map->l_direct_opencount;
@ -1449,8 +1478,9 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
/* We have two ways to specify objects to preload: via environment
variable and via the file /etc/ld.so.preload. The latter can also
be used when security is enabled. */
preloads = NULL;
npreloads = 0;
assert (GL(dl_rtld_map).l_next == NULL);
struct link_map **preloads = NULL;
unsigned int npreloads = 0;
if (__builtin_expect (preloadlist != NULL, 0))
{
@ -1469,14 +1499,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
if (p[0] != '\0'
&& (__builtin_expect (! INTUSE(__libc_enable_secure), 1)
|| strchr (p, '/') == NULL))
{
struct link_map *new_map = _dl_map_object (main_map, p, 1,
lt_library, 0, 0,
LM_ID_BASE);
if (++new_map->l_opencount == 1)
/* It is no duplicate. */
++npreloads;
}
npreloads += do_preload (p, main_map, "LD_PRELOAD");
HP_TIMING_NOW (stop);
HP_TIMING_DIFF (diff, start, stop);
@ -1548,41 +1571,14 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
runp = file;
while ((p = strsep (&runp, ": \t\n")) != NULL)
if (p[0] != '\0')
{
const char *objname;
const char *err_str = NULL;
struct map_args args;
args.str = p;
args.loader = main_map;
args.is_preloaded = 1;
args.mode = 0;
(void) _dl_catch_error (&objname, &err_str, map_doit,
&args);
if (__builtin_expect (err_str != NULL, 0))
{
_dl_error_printf ("\
ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
p, preload_file);
/* No need to call free, this is still before
the libc's malloc is used. */
}
else if (++args.map->l_opencount == 1)
/* It is no duplicate. */
++npreloads;
}
npreloads += do_preload (p, main_map, preload_file);
}
if (problem != NULL)
{
char *p = strndupa (problem, file_size - (problem - file));
struct link_map *new_map = _dl_map_object (main_map, p, 1,
lt_library, 0, 0,
LM_ID_BASE);
if (++new_map->l_opencount == 1)
/* It is no duplicate. */
++npreloads;
npreloads += do_preload (p, main_map, preload_file);
}
HP_TIMING_NOW (stop);
@ -1594,7 +1590,7 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
}
}
if (__builtin_expect (npreloads, 0) != 0)
if (__builtin_expect (GL(dl_rtld_map).l_next != NULL, 0))
{
/* Set up PRELOADS with a vector of the preloaded libraries. */
struct link_map *l;
@ -1694,14 +1690,9 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
HP_TIMING_DIFF (diff, start, stop);
HP_TIMING_ACCUM_NT (load_time, diff);
/* Mark all objects as being in the global scope and set the open
counter. */
/* Mark all objects as being in the global scope. */
for (i = main_map->l_searchlist.r_nlist; i > 0; )
{
--i;
main_map->l_searchlist.r_list[i]->l_global = 1;
++main_map->l_searchlist.r_list[i]->l_opencount;
}
main_map->l_searchlist.r_list[--i]->l_global = 1;
#ifndef MAP_ANON
/* We are done mapping things, so close the zero-fill descriptor. */
@ -1711,18 +1702,22 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
/* Remove _dl_rtld_map from the chain. */
GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next;
if (GL(dl_rtld_map).l_next)
if (GL(dl_rtld_map).l_next != NULL)
GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev;
if (__builtin_expect (GL(dl_rtld_map).l_opencount > 1, 1))
for (i = 1; i < main_map->l_searchlist.r_nlist; ++i)
if (main_map->l_searchlist.r_list[i] == &GL(dl_rtld_map))
break;
bool rtld_multiple_ref = false;
if (__builtin_expect (i < main_map->l_searchlist.r_nlist, 1))
{
/* Some DT_NEEDED entry referred to the interpreter object itself, so
put it back in the list of visible objects. We insert it into the
chain in symbol search order because gdb uses the chain's order as
its symbol search order. */
i = 1;
while (main_map->l_searchlist.r_list[i] != &GL(dl_rtld_map))
++i;
rtld_multiple_ref = true;
GL(dl_rtld_map).l_prev = main_map->l_searchlist.r_list[i - 1];
if (__builtin_expect (mode, normal) == normal)
{
@ -1894,7 +1889,7 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
}
else
{
/* If LD_WARN is set warn about undefined symbols. */
/* If LD_WARN is set, warn about undefined symbols. */
if (GLRO(dl_lazy) >= 0 && GLRO(dl_verbose))
{
/* We have to do symbol dependency testing. */
@ -1904,7 +1899,7 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
args.lazy = GLRO(dl_lazy);
l = main_map;
while (l->l_next)
while (l->l_next != NULL)
l = l->l_next;
do
{
@ -1915,10 +1910,11 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
&args);
}
l = l->l_prev;
} while (l);
}
while (l != NULL);
if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK)
&& GL(dl_rtld_map).l_opencount > 1)
&& rtld_multiple_ref)
{
/* Mark the link map as not yet relocated again. */
GL(dl_rtld_map).l_relocated = 0;
@ -2198,7 +2194,7 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
/* We must prepare the profiling. */
_dl_start_profile ();
if (GL(dl_rtld_map).l_opencount > 1)
if (rtld_multiple_ref)
{
/* There was an explicit ref to the dynamic linker as a shared lib.
Re-relocate ourselves with user-controlled symbol definitions. */

4
elf/unload.c
View File

@ -12,8 +12,8 @@
#define OUT \
for (map = _r_debug.r_map; map != NULL; map = map->l_next) \
if (map->l_type == lt_loaded) \
printf ("name = \"%s\", opencount = %d\n", \
map->l_name, (int) map->l_opencount); \
printf ("name = \"%s\", direct_opencount = %d\n", \
map->l_name, (int) map->l_direct_opencount); \
fflush (stdout)
typedef struct

4
elf/unload2.c
View File

@ -9,8 +9,8 @@
#define OUT \
for (map = _r_debug.r_map; map != NULL; map = map->l_next) \
if (map->l_type == lt_loaded) \
printf ("name = \"%s\", opencount = %d\n", \
map->l_name, (int) map->l_opencount); \
printf ("name = \"%s\", direct_opencount = %d\n", \
map->l_name, (int) map->l_direct_opencount); \
fflush (stdout)
int

5
include/link.h
View File

@ -178,7 +178,6 @@ struct link_map
Elf_Symndx l_nbuckets;
const Elf_Symndx *l_buckets, *l_chain;
unsigned int l_opencount; /* Counter for direct and indirect usage. */
unsigned int l_direct_opencount; /* Reference count for dlopen/dlclose. */
enum /* Where this object came from. */
{
@ -203,6 +202,8 @@ struct link_map
unsigned int l_auditing:1; /* Nonzero if the DSO is used in auditing. */
unsigned int l_audit_any_plt:1; /* Nonzero if at least one audit module
is interested in the PLT interception.*/
unsigned int l_removed:1; /* Nozero if the object cannot be used anymore
since it is removed. */
/* Array with version names. */
unsigned int l_nversions;
@ -267,7 +268,7 @@ struct link_map
ElfW(Word) l_flags;
/* Temporarily used in `dl_close'. */
unsigned int l_idx;
int l_idx;
struct link_map_machine l_mach;