/* Look up a symbol in the loaded objects.
- Copyright (C) 1995-2018 Free Software Foundation, Inc.
+ Copyright (C) 1995-2020 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
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
+ <https://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <libintl.h>
unsigned int stt = ELFW(ST_TYPE) (sym->st_info);
assert (ELF_RTYPE_CLASS_PLT == 1);
if (__glibc_unlikely ((sym->st_value == 0 /* No value. */
+ && sym->st_shndx != SHN_ABS
&& stt != STT_TLS)
|| ELF_MACHINE_SYM_NO_MATCH (sym)
|| (type_class & (sym->st_shndx == SHN_UNDEF))))
table[idx].map = map;
}
+/* Mark MAP as NODELETE according to the lookup mode in FLAGS. During
+ initial relocation, NODELETE state is pending only. */
+static void
+mark_nodelete (struct link_map *map, int flags)
+{
+ if (flags & DL_LOOKUP_FOR_RELOCATE)
+ map->l_nodelete_pending = true;
+ else
+ map->l_nodelete_active = true;
+}
+
+/* Return true if MAP is marked as NODELETE according to the lookup
+ mode in FLAGS> */
+static bool
+is_nodelete (struct link_map *map, int flags)
+{
+ /* Non-pending NODELETE always counts. Pending NODELETE only counts
+ during initial relocation processing. */
+ return map->l_nodelete_active
+ || ((flags & DL_LOOKUP_FOR_RELOCATE) && map->l_nodelete_pending);
+}
+
/* Utility function for do_lookup_x. Lookup an STB_GNU_UNIQUE symbol
in the unique symbol table, creating a new entry if necessary.
Return the matching symbol in RESULT. */
static void
do_lookup_unique (const char *undef_name, uint_fast32_t new_hash,
- const struct link_map *map, struct sym_val *result,
+ struct link_map *map, struct sym_val *result,
int type_class, const ElfW(Sym) *sym, const char *strtab,
- const ElfW(Sym) *ref, const struct link_map *undef_map)
+ const ElfW(Sym) *ref, const struct link_map *undef_map,
+ int flags)
{
/* We have to determine whether we already found a symbol with this
name before. If not then we have to add it to the search table.
copy from the copy addressed through the
relocation. */
result->s = sym;
- result->m = (struct link_map *) map;
+ result->m = map;
}
else
{
enter_unique_sym (entries, size,
new_hash, strtab + sym->st_name, sym, map);
- if (map->l_type == lt_loaded)
- /* Make sure we don't unload this object by
- setting the appropriate flag. */
- ((struct link_map *) map)->l_flags_1 |= DF_1_NODELETE;
+ if (map->l_type == lt_loaded && !is_nodelete (map, flags))
+ {
+ /* Make sure we don't unload this object by
+ setting the appropriate flag. */
+ if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_BINDINGS))
+ _dl_debug_printf ("\
+marking %s [%lu] as NODELETE due to unique symbol\n",
+ map->l_name, map->l_ns);
+ mark_nodelete (map, flags);
+ }
}
++tab->n_elements;
do
if (((*hasharr ^ new_hash) >> 1) == 0)
{
- symidx = hasharr - map->l_gnu_chain_zero;
+ symidx = ELF_MACHINE_HASH_SYMIDX (map, hasharr);
sym = check_match (undef_name, ref, version, flags,
type_class, &symtab[symidx], symidx,
strtab, map, &versioned_sym,
return 1;
case STB_GNU_UNIQUE:;
- do_lookup_unique (undef_name, new_hash, map, result, type_class,
- sym, strtab, ref, undef_map);
+ do_lookup_unique (undef_name, new_hash, (struct link_map *) map,
+ result, type_class, sym, strtab, ref,
+ undef_map, flags);
return 1;
default:
}
skip:
- /* If this current map is the one mentioned in the verneed entry
- and we have not found a weak entry, it is a bug. */
- if (symidx == STN_UNDEF && version != NULL && version->filename != NULL
- && __glibc_unlikely (_dl_name_match_p (version->filename, map)))
- return -1;
+ ;
}
while (++i < n);
if (undef_map == map)
return 0;
- /* Avoid references to objects which cannot be unloaded anyway. */
+ /* Avoid references to objects which cannot be unloaded anyway. We
+ do not need to record dependencies if this object goes away
+ during dlopen failure, either. IFUNC resolvers with relocation
+ dependencies may pick an dependency which can be dlclose'd, but
+ such IFUNC resolvers are undefined anyway. */
assert (map->l_type == lt_loaded);
- if ((map->l_flags_1 & DF_1_NODELETE) != 0)
+ if (is_nodelete (map, flags))
return 0;
struct link_map_reldeps *l_reldeps
/* Redo the NODELETE check, as when dl_load_lock wasn't held
yet this could have changed. */
- if ((map->l_flags_1 & DF_1_NODELETE) != 0)
+ if (is_nodelete (map, flags))
goto out;
/* If the object with the undefined reference cannot be removed ever
just make sure the same is true for the object which contains the
definition. */
- if (undef_map->l_type != lt_loaded
- || (undef_map->l_flags_1 & DF_1_NODELETE) != 0)
+ if (undef_map->l_type != lt_loaded || is_nodelete (map, flags))
{
- map->l_flags_1 |= DF_1_NODELETE;
+ if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_BINDINGS)
+ && !is_nodelete (map, flags))
+ {
+ if (undef_map->l_name[0] == '\0')
+ _dl_debug_printf ("\
+marking %s [%lu] as NODELETE due to reference to main program\n",
+ map->l_name, map->l_ns);
+ else
+ _dl_debug_printf ("\
+marking %s [%lu] as NODELETE due to reference to %s [%lu]\n",
+ map->l_name, map->l_ns,
+ undef_map->l_name, undef_map->l_ns);
+ }
+ mark_nodelete (map, flags);
goto out;
}
no fatal problem. We simply make sure the referenced object
cannot be unloaded. This is semantically the correct
behavior. */
- map->l_flags_1 |= DF_1_NODELETE;
+ if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_BINDINGS)
+ && !is_nodelete (map, flags))
+ _dl_debug_printf ("\
+marking %s [%lu] as NODELETE due to memory allocation failure\n",
+ map->l_name, map->l_ns);
+ /* In case of non-lazy binding, we could actually report
+ the memory allocation error, but for now, we use the
+ conservative approximation as well. */
+ mark_nodelete (map, flags);
goto out;
}
else
bump_num_relocations ();
- /* No other flag than DL_LOOKUP_ADD_DEPENDENCY or DL_LOOKUP_GSCOPE_LOCK
- is allowed if we look up a versioned symbol. */
- assert (version == NULL
- || (flags & ~(DL_LOOKUP_ADD_DEPENDENCY | DL_LOOKUP_GSCOPE_LOCK))
- == 0);
+ /* DL_LOOKUP_RETURN_NEWEST does not make sense for versioned
+ lookups. */
+ assert (version == NULL || !(flags & DL_LOOKUP_RETURN_NEWEST));
size_t i = 0;
if (__glibc_unlikely (skip_map != NULL))
/* Search the relevant loaded objects for a definition. */
for (size_t start = i; *scope != NULL; start = 0, ++scope)
- {
- int res = do_lookup_x (undef_name, new_hash, &old_hash, *ref,
- ¤t_value, *scope, start, version, flags,
- skip_map, type_class, undef_map);
- if (res > 0)
- break;
-
- if (__glibc_unlikely (res < 0) && skip_map == NULL)
- {
- /* Oh, oh. The file named in the relocation entry does not
- contain the needed symbol. This code is never reached
- for unversioned lookups. */
- assert (version != NULL);
- const char *reference_name = undef_map ? undef_map->l_name : "";
- struct dl_exception exception;
- /* XXX We cannot translate the message. */
- _dl_exception_create_format
- (&exception, DSO_FILENAME (reference_name),
- "symbol %s version %s not defined in file %s"
- " with link time reference%s",
- undef_name, version->name, version->filename,
- res == -2 ? " (no version symbols)" : "");
- _dl_signal_cexception (0, &exception, N_("relocation error"));
- _dl_exception_free (&exception);
- *ref = NULL;
- return 0;
- }
- }
+ if (do_lookup_x (undef_name, new_hash, &old_hash, *ref,
+ ¤t_value, *scope, start, version, flags,
+ skip_map, type_class, undef_map) != 0)
+ break;
if (__glibc_unlikely (current_value.s == NULL))
{
{
Elf_Symndx *hash;
- if (__glibc_likely (map->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
- + DT_THISPROCNUM + DT_VERSIONTAGNUM
- + DT_EXTRANUM + DT_VALNUM] != NULL))
+ if (__glibc_likely (map->l_info[ELF_MACHINE_GNU_HASH_ADDRIDX] != NULL))
{
Elf32_Word *hash32
- = (void *) D_PTR (map, l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
- + DT_THISPROCNUM + DT_VERSIONTAGNUM
- + DT_EXTRANUM + DT_VALNUM]);
+ = (void *) D_PTR (map, l_info[ELF_MACHINE_GNU_HASH_ADDRIDX]);
map->l_nbuckets = *hash32++;
Elf32_Word symbias = *hash32++;
Elf32_Word bitmask_nwords = *hash32++;
map->l_gnu_buckets = hash32;
hash32 += map->l_nbuckets;
map->l_gnu_chain_zero = hash32 - symbias;
+
+ /* Initialize MIPS xhash translation table. */
+ ELF_MACHINE_XHASH_SETUP (hash32, symbias, map);
+
return;
}
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