diff options
Diffstat (limited to 'elf/dl-lookup.c')
| -rw-r--r-- | elf/dl-lookup.c | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c index 763ec16fa4..78c8669e30 100644 --- a/elf/dl-lookup.c +++ b/elf/dl-lookup.c @@ -1,5 +1,6 @@ /* Look up a symbol in the loaded objects. - Copyright (C) 1995-2005, 2006, 2007, 2009 Free Software Foundation, Inc. + Copyright (C) 1995-2005, 2006, 2007, 2009, 2010 + Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -414,6 +415,20 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash, assert (!RTLD_CHECK_FOREIGN_CALL); #endif +#ifdef SHARED + /* If tab->entries is NULL, but tab->size is not, it means + this is the second, conflict finding, lookup for + LD_TRACE_PRELINKING in _dl_debug_bindings. Don't + allocate anything and don't enter anything into the + hash table. */ + if (__builtin_expect (tab->size, 0)) + { + assert (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK); + __rtld_lock_unlock_recursive (tab->lock); + goto success; + } +#endif + #define INITIAL_NUNIQUE_SYM_TABLE 31 size = INITIAL_NUNIQUE_SYM_TABLE; entries = calloc (sizeof (struct unique_sym), size); @@ -917,13 +932,48 @@ _dl_debug_bindings (const char *undef_name, struct link_map *undef_map, { const uint_fast32_t new_hash = dl_new_hash (undef_name); unsigned long int old_hash = 0xffffffff; + struct unique_sym *saved_entries + = GL(dl_ns)[LM_ID_BASE]._ns_unique_sym_table.entries; + GL(dl_ns)[LM_ID_BASE]._ns_unique_sym_table.entries = NULL; do_lookup_x (undef_name, new_hash, &old_hash, *ref, &val, undef_map->l_local_scope[0], 0, version, 0, NULL, type_class, undef_map); - if (val.s != value->s || val.m != value->m) conflict = 1; + else if (__builtin_expect (undef_map->l_symbolic_in_local_scope, 0) + && val.s + && __builtin_expect (ELFW(ST_BIND) (val.s->st_info), + STB_GLOBAL) == STB_GNU_UNIQUE) + { + /* If it is STB_GNU_UNIQUE and undef_map's l_local_scope + contains any DT_SYMBOLIC libraries, unfortunately there + can be conflicts even if the above is equal. As symbol + resolution goes from the last library to the first and + if a STB_GNU_UNIQUE symbol is found in some late DT_SYMBOLIC + library, it would be the one that is looked up. */ + struct sym_val val2 = { NULL, NULL }; + size_t n; + struct r_scope_elem *scope = undef_map->l_local_scope[0]; + + for (n = 0; n < scope->r_nlist; n++) + if (scope->r_list[n] == val.m) + break; + + for (n++; n < scope->r_nlist; n++) + if (scope->r_list[n]->l_info[DT_SYMBOLIC] != NULL + && do_lookup_x (undef_name, new_hash, &old_hash, *ref, + &val2, + &scope->r_list[n]->l_symbolic_searchlist, + 0, version, 0, NULL, type_class, + undef_map) > 0) + { + conflict = 1; + val = val2; + break; + } + } + GL(dl_ns)[LM_ID_BASE]._ns_unique_sym_table.entries = saved_entries; } if (value->s) |