diff options
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | elf/dl-sym.c | 60 |
2 files changed, 37 insertions, 27 deletions
@@ -1,5 +1,9 @@ 2000-10-23 Ulrich Drepper <drepper@redhat.com> + * elf/dl-sym.c (_dl_sym): Use exact check for caller PC in range + of DSO address space. + (_dl_vsym): Likewise. + * elf/dl-sym.c (_dl_sym): For RTLD_DEFAULT, search in objects global scope if we can determine it. diff --git a/elf/dl-sym.c b/elf/dl-sym.c index 954741b365..ffc36bc8f9 100644 --- a/elf/dl-sym.c +++ b/elf/dl-sym.c @@ -35,20 +35,23 @@ _dl_sym (void *handle, const char *name, void *who) struct link_map *match; struct link_map *l; + /* If the address is not recognized the call comes from the main + program (we hope). */ + match = _dl_loaded; + /* 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; + for (l = _dl_loaded; l != NULL; l = l->l_next) + if (l->l_addr != 0 && caller >= l->l_map_start && caller < l->l_map_end) + { + /* There must be exactly one DSO for the range of the virtual + memory. Otherwise something is really broken. */ + match = l; + break; + } if (handle == RTLD_DEFAULT) - { - /* Search the global scope as seen in the caller object. */ - if (match != NULL) - result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0); - else - result = _dl_lookup_symbol (name, match, &ref, _dl_global_scope, 0, 0); - } + /* Search the global scope as seen in the caller object. */ + result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0); else { if (handle != RTLD_NEXT) @@ -56,22 +59,17 @@ _dl_sym (void *handle, const char *name, void *who) /* Search the scope of the given object. */ struct link_map *map = handle; - if (match == NULL) - /* If the address is not recognized the call comes from the - main program (we hope). */ - match = _dl_loaded; - result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope, 0, 1); } else { - if (! match) + if (__builtin_expect (match == _dl_loaded, 0)) _dl_signal_error (0, NULL, N_("\ RTLD_NEXT used in code not dynamically loaded")); l = match; - while (l->l_loader) + while (l->l_loader != NULL) l = l->l_loader; result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope, @@ -79,7 +77,7 @@ RTLD_NEXT used in code not dynamically loaded")); } } - if (ref) + if (ref != NULL) return DL_SYMBOL_ADDRESS (result, ref); return NULL; @@ -103,24 +101,32 @@ _dl_vsym (void *handle, const char *name, const char *version, void *who) /* We don't have a specific file where the symbol can be found. */ vers.filename = NULL; + /* If the address is not recognized the call comes from the main + program (we hope). */ + match = _dl_loaded; + /* 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; + for (l = _dl_loaded; l != NULL; l = l->l_next) + if (l->l_addr != 0 && caller >= l->l_map_start && caller < l->l_map_end) + { + /* There must be exactly one DSO for the range of the virtual + memory. Otherwise something is really broken. */ + match = l; + break; + } if (handle == RTLD_DEFAULT) /* Search the global scope. */ - result = _dl_lookup_versioned_symbol (name, match, &ref, _dl_global_scope, + result = _dl_lookup_versioned_symbol (name, match, &ref, match->l_scope, &vers, 0, 0); else if (handle == RTLD_NEXT) { - if (! match) + if (match == _dl_loaded) _dl_signal_error (0, NULL, N_("\ RTLD_NEXT used in code not dynamically loaded")); l = match; - while (l->l_loader) + while (l->l_loader != NULL) l = l->l_loader; result = _dl_lookup_versioned_symbol_skip (name, l, &ref, @@ -135,7 +141,7 @@ RTLD_NEXT used in code not dynamically loaded")); map->l_local_scope, &vers, 0, 1); } - if (ref) + if (ref != NULL) return DL_SYMBOL_ADDRESS (result, ref); return NULL; |