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-rw-r--r--elf/dl-deps.c65
1 files changed, 48 insertions, 17 deletions
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index f87475a670..92403d4110 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -25,20 +25,33 @@ Cambridge, MA 02139, USA. */
void
_dl_map_object_deps (struct link_map *map)
{
- unsigned int nlist = 1;
- struct link_map **list = malloc (sizeof *list);
- unsigned int done;
+ struct list
+ {
+ struct link_map *map;
+ struct list *next;
+ };
+ struct list head, *tailp, *scanp;
+ unsigned int nlist;
/* Start the search list with one element: MAP itself. */
- list[0] = map;
+ head.map = map;
+ head.next = NULL;
+ nlist = 1;
+
/* Process each element of the search list, loading each of its immediate
dependencies and appending them to the list as we step through it.
This produces a flat, ordered list that represents a breadth-first
search of the dependency tree. */
- for (done = 0; done < nlist; ++done)
+ for (scanp = tailp = &head; scanp; scanp = scanp->next)
{
- struct link_map *l = list[done];
+ struct link_map *l = scanp->map;
+
+ /* We use `l_reserved' as a mark bit to detect objects we have
+ already put in the search list and avoid adding duplicate elements
+ later in the list. */
+ l->l_reserved = 1;
+
if (l->l_info[DT_NEEDED])
{
const char *strtab
@@ -47,24 +60,42 @@ _dl_map_object_deps (struct link_map *map)
for (d = l->l_ld; d->d_tag != DT_NULL; ++d)
if (d->d_tag == DT_NEEDED)
{
- /* Extend the list and put this object on the end. */
- struct link_map **n
- = realloc (list, (nlist + 1) * sizeof *list);
- if (n)
- list = n;
+ /* Map in the needed object. */
+ struct link_map *dep
+ = _dl_map_object (l, strtab + d->d_un.d_val);
+
+ if (dep->l_reserved)
+ /* This object is already in the search list we are
+ building. Don't add a duplicate pointer. Release the
+ reference just added by _dl_map_object. */
+ --dep->l_opencount;
else
{
- free (list);
- _dl_signal_error (ENOMEM, map->l_name,
- "finding dependencies");
+ /* Append DEP to the search list. */
+ tailp->next = alloca (sizeof *tailp);
+ tailp = tailp->next;
+ tailp->map = dep;
+ tailp->next = NULL;
+ ++nlist;
}
- list[nlist++] = _dl_map_object (l, strtab + d->d_un.d_val);
}
}
}
- map->l_searchlist = list;
+ /* Store the search list we built in the object. It will be used for
+ searches in the scope of this object. */
+ map->l_searchlist = malloc (nlist * sizeof (struct link_map *));
map->l_nsearchlist = nlist;
+
+ nlist = 0;
+ for (scanp = &head; scanp; scanp = scanp->next)
+ {
+ map->l_searchlist[nlist++] = scanp->map;
+
+ /* Now clear all the mark bits we set in the objects on the search list
+ to avoid duplicates, so the next call starts fresh. */
+ scanp->map->l_reserved = 0;
+ }
}
@@ -86,7 +117,7 @@ _dl_open (struct link_map *parent, const char *file, int mode)
_dl_relocate_object (l, (mode & RTLD_BINDING_MASK) == RTLD_LAZY);
/* Run the initializer functions of new objects. */
- while (init = _dl_init_next ())
+ while (init = _dl_init_next (new))
(*(void (*) (void)) init) ();
return new;