* sysdeps/generic/ldsodefs.h: Define DL_LOOKUP_SCOPE_LOCK.
* elf/dl-lookup.c (add_dependency): If scope map is locked, unlock it before getting dl_load_lock and then relock. (_dl_lookup_symbol_x): Pass flags to add_dependency. When rerunning _dl_lookup_symbol_x, compute symbol_scope again in case we unlocked the scope. * elf/dl-runtime.c (_dl_fixup): Pass DL_LOOKUP_SCOPE_LOCK to _dl_lookup_symbol_x in case we locked the scope. (_dl_profile_fixup): Likewise. * elf/dl-sym.c (do_sym): In flags passed to call_dl_lookup, also set DL_LOOKUP_SCOPE_LOCK.
This commit is contained in:
Ulrich Drepper
parent
fb453d084d
commit
4e35ef2c71
14
ChangeLog
14
ChangeLog
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@ -1,3 +1,17 @@
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2007-01-15 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/generic/ldsodefs.h: Define DL_LOOKUP_SCOPE_LOCK.
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* elf/dl-lookup.c (add_dependency): If scope map is locked, unlock
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it before getting dl_load_lock and then relock.
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(_dl_lookup_symbol_x): Pass flags to add_dependency.
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When rerunning _dl_lookup_symbol_x, compute symbol_scope again in
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case we unlocked the scope.
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* elf/dl-runtime.c (_dl_fixup): Pass DL_LOOKUP_SCOPE_LOCK to
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_dl_lookup_symbol_x in case we locked the scope.
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(_dl_profile_fixup): Likewise.
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* elf/dl-sym.c (do_sym): In flags passed to call_dl_lookup, also
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set DL_LOOKUP_SCOPE_LOCK.
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2007-01-13 Ulrich Drepper <drepper@redhat.com>
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* inet/Makefile: Define CFLAGS-getsrvbynm_r.c and
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@ -1,5 +1,5 @@
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/* Look up a symbol in the loaded objects.
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Copyright (C) 1995-2005, 2006 Free Software Foundation, Inc.
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Copyright (C) 1995-2005, 2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -25,6 +25,7 @@
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#include <ldsodefs.h>
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#include <dl-hash.h>
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#include <dl-machine.h>
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#include <sysdep-cancel.h>
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#include <bits/libc-lock.h>
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#include <tls.h>
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@ -85,7 +86,7 @@ dl_new_hash (const char *s)
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/* Add extra dependency on MAP to UNDEF_MAP. */
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static int
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internal_function
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add_dependency (struct link_map *undef_map, struct link_map *map)
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add_dependency (struct link_map *undef_map, struct link_map *map, int flags)
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{
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struct link_map **list;
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struct link_map *runp;
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@ -98,8 +99,18 @@ add_dependency (struct link_map *undef_map, struct link_map *map)
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if (undef_map == map)
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return 0;
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/* Make sure nobody can unload the object while we are at it. */
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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/* Make sure nobody can unload the object while we are at it.
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If we hold a scope lock drop it now to avoid ABBA locking problems. */
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if ((flags & DL_LOOKUP_SCOPE_LOCK) != 0 && !RTLD_SINGLE_THREAD_P)
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{
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__rtld_mrlock_unlock (undef_map->l_scope_lock);
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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__rtld_mrlock_lock (undef_map->l_scope_lock);
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}
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else
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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/* Avoid references to objects which cannot be unloaded anyway. */
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if (map->l_type != lt_loaded
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@ -226,9 +237,10 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
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bump_num_relocations ();
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/* No other flag than DL_LOOKUP_ADD_DEPENDENCY is allowed if we look
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up a versioned symbol. */
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assert (version == NULL || flags == 0 || flags == DL_LOOKUP_ADD_DEPENDENCY);
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/* No other flag than DL_LOOKUP_ADD_DEPENDENCY and DL_LOOKUP_SCOPE_LOCK
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is allowed if we look up a versioned symbol. */
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assert (version == NULL || (flags & ~(DL_LOOKUP_ADD_DEPENDENCY
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| DL_LOOKUP_SCOPE_LOCK)) == 0);
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size_t i = 0;
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if (__builtin_expect (skip_map != NULL, 0))
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@ -338,12 +350,13 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
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runtime lookups. */
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&& (flags & DL_LOOKUP_ADD_DEPENDENCY) != 0
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/* Add UNDEF_MAP to the dependencies. */
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&& add_dependency (undef_map, current_value.m) < 0)
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&& add_dependency (undef_map, current_value.m, flags) < 0)
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/* Something went wrong. Perhaps the object we tried to reference
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was just removed. Try finding another definition. */
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return _dl_lookup_symbol_x (undef_name, undef_map, ref,
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symbol_scope, version, type_class,
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flags, skip_map);
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(flags & DL_LOOKUP_SCOPE_LOCK) == 0
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? symbol_scope : undef_map->l_scope, version,
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type_class, flags, skip_map);
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/* The object is used. */
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current_value.m->l_used = 1;
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@ -1,5 +1,5 @@
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/* On-demand PLT fixup for shared objects.
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Copyright (C) 1995-2002,2003,2004,2005,2006 Free Software Foundation, Inc.
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Copyright (C) 1995-2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -93,14 +93,20 @@ _dl_fixup (
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version = NULL;
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}
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/* We need to keep the scope around so do some locking. This is
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not necessary for objects which cannot be unloaded or when
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we are not using any threads (yet). */
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int flags = DL_LOOKUP_ADD_DEPENDENCY;
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if (l->l_type == lt_loaded && !RTLD_SINGLE_THREAD_P)
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__rtld_mrlock_lock (l->l_scope_lock);
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{
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__rtld_mrlock_lock (l->l_scope_lock);
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flags |= DL_LOOKUP_SCOPE_LOCK;
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}
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result = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym,
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l->l_scope, version, ELF_RTYPE_CLASS_PLT,
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DL_LOOKUP_ADD_DEPENDENCY, NULL);
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result = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym, l->l_scope,
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version, ELF_RTYPE_CLASS_PLT, flags, NULL);
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if (l->l_type == lt_loaded && !RTLD_SINGLE_THREAD_P)
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if ((flags & DL_LOOKUP_SCOPE_LOCK) != 0)
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__rtld_mrlock_unlock (l->l_scope_lock);
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/* Currently result contains the base load address (or link map)
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@ -181,15 +187,21 @@ _dl_profile_fixup (
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version = NULL;
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}
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/* We need to keep the scope around so do some locking. This is
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not necessary for objects which cannot be unloaded or when
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we are not using any threads (yet). */
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int flags = DL_LOOKUP_ADD_DEPENDENCY;
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if (l->l_type == lt_loaded && !RTLD_SINGLE_THREAD_P)
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__rtld_mrlock_lock (l->l_scope_lock);
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{
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__rtld_mrlock_lock (l->l_scope_lock);
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flags |= DL_LOOKUP_SCOPE_LOCK;
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}
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result = _dl_lookup_symbol_x (strtab + refsym->st_name, l, &defsym,
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l->l_scope, version,
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ELF_RTYPE_CLASS_PLT,
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DL_LOOKUP_ADD_DEPENDENCY, NULL);
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result = _dl_lookup_symbol_x (strtab + refsym->st_name, l,
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&defsym, l->l_scope, version,
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ELF_RTYPE_CLASS_PLT, flags, NULL);
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if (l->l_type == lt_loaded && !RTLD_SINGLE_THREAD_P)
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if ((flags & DL_LOOKUP_SCOPE_LOCK) != 0)
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__rtld_mrlock_unlock (l->l_scope_lock);
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/* Currently result contains the base load address (or link map)
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@ -1,5 +1,5 @@
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/* Look up a symbol in a shared object loaded by `dlopen'.
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Copyright (C) 1999,2000,2001,2002,2004,2006 Free Software Foundation, Inc.
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Copyright (C) 1999-2002,2004,2006,2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -126,7 +126,7 @@ do_sym (void *handle, const char *name, void *who,
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args.name = name;
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args.map = match;
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args.vers = vers;
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args.flags = flags | DL_LOOKUP_ADD_DEPENDENCY;
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args.flags = flags | DL_LOOKUP_ADD_DEPENDENCY | DL_LOOKUP_SCOPE_LOCK;
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args.refp = &ref;
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const char *objname;
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@ -1,5 +1,5 @@
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/* Run-time dynamic linker data structures for loaded ELF shared objects.
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Copyright (C) 1995-2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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Copyright (C) 1995-2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -838,7 +838,9 @@ enum
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DL_LOOKUP_ADD_DEPENDENCY = 1,
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/* Return most recent version instead of default version for
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unversioned lookup. */
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DL_LOOKUP_RETURN_NEWEST = 2
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DL_LOOKUP_RETURN_NEWEST = 2,
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/* Set if the scopr lock in the UNDEF_MAP is taken. */
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DL_LOOKUP_SCOPE_LOCK = 4
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};
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/* Lookup versioned symbol. */
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@ -847,7 +849,7 @@ extern lookup_t _dl_lookup_symbol_x (const char *undef,
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const ElfW(Sym) **sym,
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struct r_scope_elem *symbol_scope[],
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const struct r_found_version *version,
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int type_class, int explicit,
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int type_class, int flags,
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struct link_map *skip_map)
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internal_function attribute_hidden;
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