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Diffstat (limited to 'elf/dlsym.c')
-rw-r--r--elf/dlsym.c38
1 files changed, 28 insertions, 10 deletions
diff --git a/elf/dlsym.c b/elf/dlsym.c
index edfe1c6cbb..12a29e4b4c 100644
--- a/elf/dlsym.c
+++ b/elf/dlsym.c
@@ -26,25 +26,43 @@
void *
dlsym (void *handle, const char *name)
{
+ ElfW(Addr) caller = (ElfW(Addr)) __builtin_return_address (0);
ElfW(Addr) loadbase;
const ElfW(Sym) *ref = NULL;
void doit (void)
{
- struct link_map *map = handle, **scope, *mapscope[2] = { map, NULL };
- const char *owner;
-
- if (map)
+ if (handle == NULL)
+ /* Search the global scope. */
+ loadbase = _dl_lookup_symbol
+ (name, &ref, &(_dl_global_scope ?: _dl_default_scope)[2], NULL, 0);
+ else if (handle == RTLD_NEXT)
{
- /* Search the scope of the given object. */
- scope = mapscope;
- owner = map->l_name;
+ struct link_map *l, *match;
+
+ /* Find the highest-addressed object that CALLER is not below. */
+ match = NULL;
+ for (l = _dl_loaded; l; l = l->l_next)
+ if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
+ match = l;
+
+ if (! match)
+ _dl_signal_error (0, NULL, _("\
+RTLD_NEXT used in code not dynamically loaded"));
+
+ l = match;
+ while (l->l_loader)
+ l = l->l_loader;
+
+ loadbase = _dl_lookup_symbol_skip
+ (name, &ref, &_dl_loaded, NULL, l, 0);
}
else
{
- scope = &(_dl_global_scope ?: _dl_default_scope)[2];
- owner = NULL;
+ /* Search the scope of the given object. */
+ struct link_map *map = handle;
+ struct link_map *mapscope[2] = { map, NULL };
+ loadbase = _dl_lookup_symbol (name, &ref, mapscope, map->l_name, 0);
}
- loadbase = _dl_lookup_symbol (name, &ref, scope, owner, 0);
}
return _dlerror_run (doit) ? NULL : (void *) (loadbase + ref->st_value);