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Update.
2000-10-21 Ulrich Drepper <drepper@redhat.com> * elf/dl-open.c (add_to_global): New function. Split out from dl_open_worker. (dl_open_worker): Call add_to_global not only for new objects, also for previously loaded objects when (mode & RTLD_GLOBAL) and the object was not yet in the global scope. * elf/Makefile: Add rules to build and run lateglobal. * elf/lateglobal.c: New file. * elf/ltglobmod1.c: New file. * elf/ltglobmod2.c: New file.
This commit is contained in:
Ulrich Drepper
parent
c91bc73e3e
commit
d785c36692
12
ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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2000-10-21 Ulrich Drepper <drepper@redhat.com>
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* elf/dl-open.c (add_to_global): New function. Split out from
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dl_open_worker.
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(dl_open_worker): Call add_to_global not only for new objects, also for
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previously loaded objects when (mode & RTLD_GLOBAL) and the object
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was not yet in the global scope.
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* elf/Makefile: Add rules to build and run lateglobal.
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* elf/lateglobal.c: New file.
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* elf/ltglobmod1.c: New file.
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* elf/ltglobmod2.c: New file.
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2000-10-20 Ulrich Drepper <drepper@redhat.com>
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* include/link.h (struct link_map): Add l_soname_added bitfield.
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11
elf/Makefile
11
elf/Makefile
@ -55,7 +55,7 @@ distribute := $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
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reldepmod1.c reldepmod2.c reldepmod3.c reldepmod4.c \
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nextmod1.c nextmod2.c \
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neededobj1.c neededobj2.c neededobj3.c \
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unload2mod.c unload2dep.c
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unload2mod.c unload2dep.c ltglobmod1.c ltglobmod2.c
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include ../Makeconfig
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@ -97,7 +97,7 @@ ifeq (yes,$(build-shared))
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tests = loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
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constload1 order $(tests-vis-$(have-protected)) noload filter unload \
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reldep reldep2 reldep3 next $(tests-nodelete-$(have-z-nodelete)) \
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$(tests-nodlopen-$(have-z-nodlopen)) neededtest unload2
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$(tests-nodlopen-$(have-z-nodlopen)) neededtest unload2 lateglobal
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tests-vis-yes = vismain
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tests-nodelete-yes = nodelete
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tests-nodlopen-yes = nodlopen
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@ -108,7 +108,8 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
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$(modules-nodelete-$(have-z-nodelete)) \
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$(modules-nodlopen-$(have-z-nodlopen)) filtmod1 filtmod2 \
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reldepmod1 reldepmod2 reldepmod3 reldepmod4 nextmod1 nextmod2 \
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neededobj1 neededobj2 neededobj3 unload2mod unload2dep
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neededobj1 neededobj2 neededobj3 unload2mod unload2dep \
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ltglobmod1 ltglobmod2
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modules-vis-yes = vismod1 vismod2 vismod3
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modules-nodelete-yes = nodelmod1 nodelmod2 nodelmod3 nodelmod4
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modules-nodlopen-yes = nodlopenmod
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@ -255,6 +256,7 @@ $(objpfx)neededobj1.so: $(libdl)
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$(objpfx)neededobj2.so: $(objpfx)neededobj1.so $(libdl)
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$(objpfx)neededobj3.so: $(objpfx)neededobj1.so $(objpfx)neededobj2.so $(libdl)
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$(objpfx)unload2mod.so: $(objpfx)unload2dep.so
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$(objpfx)ltglobmod2.so: $(libdl)
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# filtmod1.so has a special rule
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$(filter-out $(objpfx)filtmod1.so, $(test-modules)): $(objpfx)%.so: $(objpfx)%.os
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@ -356,3 +358,6 @@ $(objpfx)next: $(objpfx)nextmod1.so $(objpfx)nextmod2.so $(libdl)
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$(objpfx)unload2: $(libdl)
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$(objpfx)unload2.out: $(objpfx)unload2mod.so $(objpfx)unload2dep.so
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$(objpfx)lateglobal: $(libdl)
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$(objpfx)lateglobal.out: $(objpfx)ltglobmod1.so $(objpfx)ltglobmod2.so
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166
elf/dl-open.c
166
elf/dl-open.c
@ -80,6 +80,87 @@ struct dl_open_args
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struct link_map *map;
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};
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static int
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add_to_global (struct link_map *new)
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{
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struct link_map **new_global;
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unsigned int to_add = 0;
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unsigned int cnt;
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/* Count the objects we have to put in the global scope. */
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for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
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if (new->l_searchlist.r_list[cnt]->l_global == 0)
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++to_add;
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/* The symbols of the new objects and its dependencies are to be
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introduced into the global scope that will be used to resolve
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references from other dynamically-loaded objects.
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The global scope is the searchlist in the main link map. We
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extend this list if necessary. There is one problem though:
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since this structure was allocated very early (before the libc
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is loaded) the memory it uses is allocated by the malloc()-stub
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in the ld.so. When we come here these functions are not used
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anymore. Instead the malloc() implementation of the libc is
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used. But this means the block from the main map cannot be used
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in an realloc() call. Therefore we allocate a completely new
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array the first time we have to add something to the locale scope. */
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if (_dl_global_scope_alloc == 0)
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{
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/* This is the first dynamic object given global scope. */
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_dl_global_scope_alloc = _dl_main_searchlist->r_nlist + to_add + 8;
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new_global = (struct link_map **)
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malloc (_dl_global_scope_alloc * sizeof (struct link_map *));
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if (new_global == NULL)
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{
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_dl_global_scope_alloc = 0;
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nomem:
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_dl_signal_error (ENOMEM, new->l_libname->name,
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N_("cannot extend global scope"));
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return 1;
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}
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/* Copy over the old entries. */
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memcpy (new_global, _dl_main_searchlist->r_list,
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(_dl_main_searchlist->r_nlist * sizeof (struct link_map *)));
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_dl_main_searchlist->r_list = new_global;
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}
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else if (_dl_main_searchlist->r_nlist + to_add > _dl_global_scope_alloc)
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{
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/* We have to extend the existing array of link maps in the
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main map. */
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new_global = (struct link_map **)
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realloc (_dl_main_searchlist->r_list,
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((_dl_global_scope_alloc + to_add + 8)
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* sizeof (struct link_map *)));
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if (new_global == NULL)
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goto nomem;
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_dl_global_scope_alloc += to_add + 8;
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_dl_main_searchlist->r_list = new_global;
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}
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/* Now add the new entries. */
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for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
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{
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struct link_map *map = new->l_searchlist.r_list[cnt];
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if (map->l_global == 0)
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{
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map->l_global = 1;
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_dl_main_searchlist->r_list[_dl_main_searchlist->r_nlist] = map;
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++_dl_main_searchlist->r_nlist;
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}
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}
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/* XXX Do we have to add something to r_dupsearchlist??? --drepper */
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return 0;
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}
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static void
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dl_open_worker (void *a)
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{
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@ -172,6 +253,12 @@ dl_open_worker (void *a)
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buf + sizeof buf - 1, 10, 0),
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"\n\n", NULL);
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}
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/* If the user requested the object t be in the global namespace
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but it is not so far, add it now. */
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if ((mode & RTLD_GLOBAL) && new->l_global == 0)
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(void) add_to_global (new);
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/* It was already open. */
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return;
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}
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@ -232,81 +319,10 @@ dl_open_worker (void *a)
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/* Now we can make the new map available in the global scope. */
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if (mode & RTLD_GLOBAL)
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{
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struct link_map **new_global;
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unsigned int to_add = 0;
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unsigned int cnt;
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/* Count the objects we have to put in the global scope. */
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for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
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if (new->l_searchlist.r_list[cnt]->l_global == 0)
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++to_add;
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/* The symbols of the new objects and its dependencies are to be
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introduced into the global scope that will be used to resolve
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references from other dynamically-loaded objects.
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The global scope is the searchlist in the main link map. We
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extend this list if necessary. There is one problem though:
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since this structure was allocated very early (before the libc
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is loaded) the memory it uses is allocated by the malloc()-stub
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in the ld.so. When we come here these functions are not used
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anymore. Instead the malloc() implementation of the libc is
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used. But this means the block from the main map cannot be used
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in an realloc() call. Therefore we allocate a completely new
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array the first time we have to add something to the locale scope. */
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if (_dl_global_scope_alloc == 0)
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{
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/* This is the first dynamic object given global scope. */
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_dl_global_scope_alloc = _dl_main_searchlist->r_nlist + to_add + 8;
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new_global = (struct link_map **)
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malloc (_dl_global_scope_alloc * sizeof (struct link_map *));
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if (new_global == NULL)
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{
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_dl_global_scope_alloc = 0;
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nomem:
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_dl_signal_error (ENOMEM, new->l_libname->name,
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N_("cannot extend global scope"));
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return;
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}
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/* Copy over the old entries. */
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memcpy (new_global, _dl_main_searchlist->r_list,
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(_dl_main_searchlist->r_nlist * sizeof (struct link_map *)));
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_dl_main_searchlist->r_list = new_global;
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}
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else if (_dl_main_searchlist->r_nlist + to_add > _dl_global_scope_alloc)
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{
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/* We have to extend the existing array of link maps in the
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main map. */
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new_global = (struct link_map **)
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realloc (_dl_main_searchlist->r_list,
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((_dl_global_scope_alloc + to_add + 8)
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* sizeof (struct link_map *)));
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if (new_global == NULL)
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goto nomem;
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_dl_global_scope_alloc += to_add + 8;
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_dl_main_searchlist->r_list = new_global;
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}
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/* Now add the new entries. */
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for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
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{
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struct link_map *map = new->l_searchlist.r_list[cnt];
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if (map->l_global == 0)
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{
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map->l_global = 1;
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_dl_main_searchlist->r_list[_dl_main_searchlist->r_nlist] = map;
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++_dl_main_searchlist->r_nlist;
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}
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}
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/* XXX Do we have to add something to r_dupsearchlist??? --drepper */
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}
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/* Move the object in the global namespace. */
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if (add_to_global (new) != 0)
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/* It failed. */
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return;
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/* Mark the object as not deletable if the RTLD_NODELETE flags was
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passed. */
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47
elf/lateglobal.c
Normal file
47
elf/lateglobal.c
Normal file
@ -0,0 +1,47 @@
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#include <dlfcn.h>
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#include <mcheck.h>
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#include <stdio.h>
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#include <stdlib.h>
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int
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main (void)
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{
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void *h[2];
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int fail;
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int (*fp) (void);
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mtrace ();
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h[0] = dlopen ("ltglobmod1.so", RTLD_LAZY);
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if (h == NULL)
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{
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printf ("%s: cannot open %s: %s",
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__FUNCTION__, "ltglobmod1.so", dlerror ());
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exit (EXIT_FAILURE);
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}
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h[1] = dlopen ("ltglobmod2.so", RTLD_LAZY);
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if (h == NULL)
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{
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printf ("%s: cannot open %s: %s",
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__FUNCTION__, "ltglobmod2.so", dlerror ());
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exit (EXIT_FAILURE);
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}
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puts ("loaded \"ltglobmod1.so\" without RTLD_GLOBAL");
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fp = dlsym (h[1], "foo");
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if (fp == NULL)
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{
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printf ("cannot get address of `foo': %s", dlerror ());
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exit (EXIT_FAILURE);
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}
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fail = fp ();
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puts ("back in main");
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dlclose (h[1]);
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dlclose (h[0]);
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return fail;
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}
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5
elf/ltglobmod1.c
Normal file
5
elf/ltglobmod1.c
Normal file
@ -0,0 +1,5 @@
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int
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bar (void)
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{
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return 42;
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}
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32
elf/ltglobmod2.c
Normal file
32
elf/ltglobmod2.c
Normal file
@ -0,0 +1,32 @@
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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extern int bar (void);
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int
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foo (void)
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{
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void *h;
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int res;
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/* Load ltglobalmod1 in the global namespace. */
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h = dlopen ("ltglobmod1.so", RTLD_GLOBAL | RTLD_LAZY);
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if (h == NULL)
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{
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printf ("%s: cannot open %s: %s",
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__FUNCTION__, "ltglobmod1.so", dlerror ());
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exit (EXIT_FAILURE);
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}
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/* Call bar. This is undefined in the DSO. */
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puts ("about to call `bar'");
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fflush (stdout);
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res = bar ();
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printf ("bar returned %d\n", res);
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dlclose (h);
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return res != 42;
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}
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