/* Call the termination functions of loaded shared objects.
- Copyright (C) 1995,96,1998-2002,2004 Free Software Foundation, Inc.
+ Copyright (C) 1995-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
-#include <alloca.h>
#include <assert.h>
#include <string.h>
#include <ldsodefs.h>
void
internal_function
-_dl_fini (void)
+_dl_sort_fini (struct link_map **maps, size_t nmaps, char *used, Lmid_t ns)
{
- /* Lots of fun ahead. We have to call the destructors for all still
- loaded objects. The problem is that the ELF specification now
- demands that dependencies between the modules are taken into account.
- I.e., the destructor for a module is called before the ones for any
- of its dependencies.
+ /* A list of one element need not be sorted. */
+ if (nmaps == 1)
+ return;
+
+ /* We can skip looking for the binary itself which is at the front
+ of the search list for the main namespace. */
+ unsigned int i = ns == LM_ID_BASE;
+ uint16_t seen[nmaps];
+ memset (seen, 0, nmaps * sizeof (seen[0]));
+ while (1)
+ {
+ /* Keep track of which object we looked at this round. */
+ ++seen[i];
+ struct link_map *thisp = maps[i];
+
+ /* Do not handle ld.so in secondary namespaces and object which
+ are not removed. */
+ if (thisp != thisp->l_real || thisp->l_idx == -1)
+ goto skip;
+
+ /* Find the last object in the list for which the current one is
+ a dependency and move the current object behind the object
+ with the dependency. */
+ unsigned int k = nmaps - 1;
+ while (k > i)
+ {
+ struct link_map **runp = maps[k]->l_initfini;
+ if (runp != NULL)
+ /* Look through the dependencies of the object. */
+ while (*runp != NULL)
+ if (__glibc_unlikely (*runp++ == thisp))
+ {
+ move:
+ /* Move the current object to the back past the last
+ object with it as the dependency. */
+ memmove (&maps[i], &maps[i + 1],
+ (k - i) * sizeof (maps[0]));
+ maps[k] = thisp;
+
+ if (used != NULL)
+ {
+ char here_used = used[i];
+ memmove (&used[i], &used[i + 1],
+ (k - i) * sizeof (used[0]));
+ used[k] = here_used;
+ }
- To make things more complicated, we cannot simply use the reverse
- order of the constructors. Since the user might have loaded objects
- using `dlopen' there are possibly several other modules with its
- dependencies to be taken into account. Therefore we have to start
- determining the order of the modules once again from the beginning. */
- unsigned int i;
- unsigned int nloaded;
- struct link_map *l;
- struct link_map **maps;
+ if (seen[i + 1] > nmaps - i)
+ {
+ ++i;
+ goto next_clear;
+ }
- /* Protect against concurrent loads and unloads. */
- __rtld_lock_lock_recursive (GL(dl_load_lock));
+ uint16_t this_seen = seen[i];
+ memmove (&seen[i], &seen[i + 1], (k - i) * sizeof (seen[0]));
+ seen[k] = this_seen;
- nloaded = GL(dl_nloaded);
+ goto next;
+ }
- /* XXX Could it be (in static binaries) that there is no object loaded? */
- assert (nloaded > 0);
+ if (__glibc_unlikely (maps[k]->l_reldeps != NULL))
+ {
+ unsigned int m = maps[k]->l_reldeps->act;
+ struct link_map **relmaps = &maps[k]->l_reldeps->list[0];
- /* Now we can allocate an array to hold all the pointers and copy
- the pointers in. */
- maps = (struct link_map **) alloca (nloaded * sizeof (struct link_map *));
- for (l = GL(dl_loaded), i = 0; l != NULL; l = l->l_next)
- {
- assert (i < nloaded);
+ /* Look through the relocation dependencies of the object. */
+ while (m-- > 0)
+ if (__glibc_unlikely (relmaps[m] == thisp))
+ {
+ /* If a cycle exists with a link time dependency,
+ preserve the latter. */
+ struct link_map **runp = thisp->l_initfini;
+ if (runp != NULL)
+ while (*runp != NULL)
+ if (__glibc_unlikely (*runp++ == maps[k]))
+ goto ignore;
+ goto move;
+ }
+ ignore:;
+ }
- maps[i++] = l;
+ --k;
+ }
- /* Bump l_opencount of all objects so that they are not dlclose()ed
- from underneath us. */
- ++l->l_opencount;
- }
- assert (i == nloaded);
+ skip:
+ if (++i == nmaps)
+ break;
+ next_clear:
+ memset (&seen[i], 0, (nmaps - i) * sizeof (seen[0]));
- /* Now we have to do the sorting. */
- for (l = GL(dl_loaded)->l_next; l != NULL; l = l->l_next)
- {
- unsigned int j;
- unsigned int k;
+ next:;
+ }
+}
- /* Find the place in the 'maps' array. */
- for (j = 1; maps[j] != l; ++j)
- ;
- /* Find all object for which the current one is a dependency and
- move the found object (if necessary) in front. */
- for (k = j + 1; k < nloaded; ++k)
- {
- struct link_map **runp = maps[k]->l_initfini;
- if (runp != NULL)
- {
- while (*runp != NULL)
- if (*runp == l)
- {
- struct link_map *here = maps[k];
-
- /* Move it now. */
- memmove (&maps[j] + 1,
- &maps[j],
- (k - j) * sizeof (struct link_map *));
- maps[j++] = here;
+void
+internal_function
+_dl_fini (void)
+{
+ /* Lots of fun ahead. We have to call the destructors for all still
+ loaded objects, in all namespaces. The problem is that the ELF
+ specification now demands that dependencies between the modules
+ are taken into account. I.e., the destructor for a module is
+ called before the ones for any of its dependencies.
- break;
- }
- else
- ++runp;
- }
+ To make things more complicated, we cannot simply use the reverse
+ order of the constructors. Since the user might have loaded objects
+ using `dlopen' there are possibly several other modules with its
+ dependencies to be taken into account. Therefore we have to start
+ determining the order of the modules once again from the beginning. */
- if (__builtin_expect (maps[k]->l_reldeps != NULL, 0))
+ /* We run the destructors of the main namespaces last. As for the
+ other namespaces, we pick run the destructors in them in reverse
+ order of the namespace ID. */
+#ifdef SHARED
+ int do_audit = 0;
+ again:
+#endif
+ for (Lmid_t ns = GL(dl_nns) - 1; ns >= 0; --ns)
+ {
+ /* Protect against concurrent loads and unloads. */
+ __rtld_lock_lock_recursive (GL(dl_load_lock));
+
+ unsigned int nloaded = GL(dl_ns)[ns]._ns_nloaded;
+ /* No need to do anything for empty namespaces or those used for
+ auditing DSOs. */
+ if (nloaded == 0
+#ifdef SHARED
+ || GL(dl_ns)[ns]._ns_loaded->l_auditing != do_audit
+#endif
+ )
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+ else
+ {
+ /* Now we can allocate an array to hold all the pointers and
+ copy the pointers in. */
+ struct link_map *maps[nloaded];
+
+ unsigned int i;
+ struct link_map *l;
+ assert (nloaded != 0 || GL(dl_ns)[ns]._ns_loaded == NULL);
+ for (l = GL(dl_ns)[ns]._ns_loaded, i = 0; l != NULL; l = l->l_next)
+ /* Do not handle ld.so in secondary namespaces. */
+ if (l == l->l_real)
+ {
+ assert (i < nloaded);
+
+ maps[i] = l;
+ l->l_idx = i;
+ ++i;
+
+ /* Bump l_direct_opencount of all objects so that they
+ are not dlclose()ed from underneath us. */
+ ++l->l_direct_opencount;
+ }
+ assert (ns != LM_ID_BASE || i == nloaded);
+ assert (ns == LM_ID_BASE || i == nloaded || i == nloaded - 1);
+ unsigned int nmaps = i;
+
+ /* Now we have to do the sorting. */
+ _dl_sort_fini (maps, nmaps, NULL, ns);
+
+ /* We do not rely on the linked list of loaded object anymore
+ from this point on. We have our own list here (maps). The
+ various members of this list cannot vanish since the open
+ count is too high and will be decremented in this loop. So
+ we release the lock so that some code which might be called
+ from a destructor can directly or indirectly access the
+ lock. */
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+
+ /* 'maps' now contains the objects in the right order. Now
+ call the destructors. We have to process this array from
+ the front. */
+ for (i = 0; i < nmaps; ++i)
{
- unsigned int m = maps[k]->l_reldepsact;
- struct link_map **relmaps = maps[k]->l_reldeps;
+ struct link_map *l = maps[i];
- while (m-- > 0)
+ if (l->l_init_called)
{
- if (relmaps[m] == l)
- {
- struct link_map *here = maps[k];
+ /* Make sure nothing happens if we are called twice. */
+ l->l_init_called = 0;
- /* Move it now. */
- memmove (&maps[j] + 1,
- &maps[j],
- (k - j) * sizeof (struct link_map *));
- maps[j] = here;
+ /* Is there a destructor function? */
+ if (l->l_info[DT_FINI_ARRAY] != NULL
+ || l->l_info[DT_FINI] != NULL)
+ {
+ /* When debugging print a message first. */
+ if (__builtin_expect (GLRO(dl_debug_mask)
+ & DL_DEBUG_IMPCALLS, 0))
+ _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
+ DSO_FILENAME (l->l_name),
+ ns);
+
+ /* First see whether an array is given. */
+ if (l->l_info[DT_FINI_ARRAY] != NULL)
+ {
+ ElfW(Addr) *array =
+ (ElfW(Addr) *) (l->l_addr
+ + l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
+ unsigned int i = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
+ / sizeof (ElfW(Addr)));
+ while (i-- > 0)
+ ((fini_t) array[i]) ();
+ }
+
+ /* Next try the old-style destructor. */
+ if (l->l_info[DT_FINI] != NULL)
+ DL_CALL_DT_FINI
+ (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr);
+ }
- break;
+#ifdef SHARED
+ /* Auditing checkpoint: another object closed. */
+ if (!do_audit && __builtin_expect (GLRO(dl_naudit) > 0, 0))
+ {
+ struct audit_ifaces *afct = GLRO(dl_audit);
+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ {
+ if (afct->objclose != NULL)
+ /* Return value is ignored. */
+ (void) afct->objclose (&l->l_audit[cnt].cookie);
+
+ afct = afct->next;
+ }
}
+#endif
}
+
+ /* Correct the previous increment. */
+ --l->l_direct_opencount;
}
}
}
- /* We do not rely on the linked list of loaded object anymore from
- this point on. We have our own list here (maps). The various
- members of this list cannot vanish since the open count is too
- high and will be decremented in this loop. So we release the
- lock so that some code which might be called from a destructor
- can directly or indirectly access the lock. */
- __rtld_lock_unlock_recursive (GL(dl_load_lock));
-
- /* 'maps' now contains the objects in the right order. Now call the
- destructors. We have to process this array from the front. */
- for (i = 0; i < nloaded; ++i)
+#ifdef SHARED
+ if (! do_audit && GLRO(dl_naudit) > 0)
{
- l = maps[i];
-
- if (l->l_init_called)
- {
- /* Make sure nothing happens if we are called twice. */
- l->l_init_called = 0;
-
- /* Don't call the destructors for objects we are not supposed to. */
- if (l->l_name[0] == '\0' && l->l_type == lt_executable)
- continue;
-
- /* Is there a destructor function? */
- if (l->l_info[DT_FINI_ARRAY] == NULL && l->l_info[DT_FINI] == NULL)
- continue;
-
- /* When debugging print a message first. */
- if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
- _dl_debug_printf ("\ncalling fini: %s\n\n",
- l->l_name[0] ? l->l_name : rtld_progname);
-
- /* First see whether an array is given. */
- if (l->l_info[DT_FINI_ARRAY] != NULL)
- {
- ElfW(Addr) *array =
- (ElfW(Addr) *) (l->l_addr
- + l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
- unsigned int i = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
- / sizeof (ElfW(Addr)));
- while (i-- > 0)
- ((fini_t) array[i]) ();
- }
-
- /* Next try the old-style destructor. */
- if (l->l_info[DT_FINI] != NULL)
- ((fini_t) DL_DT_FINI_ADDRESS (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr)) ();
- }
-
- /* Correct the previous increment. */
- --l->l_opencount;
+ do_audit = 1;
+ goto again;
}
- if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS, 0))
+ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS))
_dl_debug_printf ("\nruntime linker statistics:\n"
" final number of relocations: %lu\n"
"final number of relocations from cache: %lu\n",
GL(dl_num_relocations),
GL(dl_num_cache_relocations));
+#endif
}
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