diff options
Diffstat (limited to 'elf/dlsym.c')
| -rw-r--r-- | elf/dlsym.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/elf/dlsym.c b/elf/dlsym.c index edfe1c6..12a29e4 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); |