/* Load a shared object at runtime, relocate it, and run its initializer.
- Copyright (C) 1996-2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1996-2007, 2009 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
#include <ldsodefs.h>
#include <bp-sym.h>
#include <caller.h>
+#include <sysdep-cancel.h>
+#include <tls.h>
#include <dl-dst.h>
-#ifndef SHARED
-/* Giving this initialized value preallocates some surplus bytes in the
- static TLS area, see __libc_setup_tls (libc-tls.c). */
-size_t _dl_tls_static_size = 2048;
-#endif
-
extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
void (*dl_main) (const ElfW(Phdr) *phdr,
ElfW(Word) phnum,
in an realloc() call. Therefore we allocate a completely new
array the first time we have to add something to the locale scope. */
- if (GL(dl_ns)[new->l_ns]._ns_global_scope_alloc == 0)
+ struct link_namespaces *ns = &GL(dl_ns)[new->l_ns];
+ if (ns->_ns_global_scope_alloc == 0)
{
/* This is the first dynamic object given global scope. */
- GL(dl_ns)[new->l_ns]._ns_global_scope_alloc
- = GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_nlist + to_add + 8;
+ ns->_ns_global_scope_alloc
+ = ns->_ns_main_searchlist->r_nlist + to_add + 8;
new_global = (struct link_map **)
- malloc (GL(dl_ns)[new->l_ns]._ns_global_scope_alloc
- * sizeof (struct link_map *));
+ malloc (ns->_ns_global_scope_alloc * sizeof (struct link_map *));
if (new_global == NULL)
{
- GL(dl_ns)[new->l_ns]._ns_global_scope_alloc = 0;
+ ns->_ns_global_scope_alloc = 0;
nomem:
_dl_signal_error (ENOMEM, new->l_libname->name, NULL,
N_("cannot extend global scope"));
}
/* Copy over the old entries. */
- GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list
- = memcpy (new_global,
- GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list,
- (GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_nlist
+ ns->_ns_main_searchlist->r_list
+ = memcpy (new_global, ns->_ns_main_searchlist->r_list,
+ (ns->_ns_main_searchlist->r_nlist
* sizeof (struct link_map *)));
}
- else if (GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_nlist + to_add
- > GL(dl_ns)[new->l_ns]._ns_global_scope_alloc)
+ else if (ns->_ns_main_searchlist->r_nlist + to_add
+ > ns->_ns_global_scope_alloc)
{
/* We have to extend the existing array of link maps in the
main map. */
+ struct link_map **old_global
+ = GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list;
+ size_t new_nalloc = ((ns->_ns_global_scope_alloc + to_add) * 2);
+
new_global = (struct link_map **)
- realloc (GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list,
- ((GL(dl_ns)[new->l_ns]._ns_global_scope_alloc + to_add + 8)
- * sizeof (struct link_map *)));
+ malloc (new_nalloc * sizeof (struct link_map *));
if (new_global == NULL)
goto nomem;
- GL(dl_ns)[new->l_ns]._ns_global_scope_alloc += to_add + 8;
- GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list = new_global;
+ memcpy (new_global, old_global,
+ ns->_ns_global_scope_alloc * sizeof (struct link_map *));
+
+ ns->_ns_global_scope_alloc = new_nalloc;
+ ns->_ns_main_searchlist->r_list = new_global;
+
+ if (!RTLD_SINGLE_THREAD_P)
+ THREAD_GSCOPE_WAIT ();
+
+ free (old_global);
}
/* Now add the new entries. */
+ unsigned int new_nlist = ns->_ns_main_searchlist->r_nlist;
for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
{
struct link_map *map = new->l_searchlist.r_list[cnt];
if (map->l_global == 0)
{
map->l_global = 1;
- GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list[GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_nlist]
- = map;
- ++GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_nlist;
+ ns->_ns_main_searchlist->r_list[new_nlist++] = map;
}
}
+ atomic_write_barrier ();
+ ns->_ns_main_searchlist->r_nlist = new_nlist;
return 0;
}
+int
+_dl_scope_free (void *old)
+{
+ struct dl_scope_free_list *fsl;
+#define DL_SCOPE_FREE_LIST_SIZE (sizeof (fsl->list) / sizeof (fsl->list[0]))
+
+ if (RTLD_SINGLE_THREAD_P)
+ free (old);
+ else if ((fsl = GL(dl_scope_free_list)) == NULL)
+ {
+ GL(dl_scope_free_list) = fsl = malloc (sizeof (*fsl));
+ if (fsl == NULL)
+ {
+ THREAD_GSCOPE_WAIT ();
+ free (old);
+ return 1;
+ }
+ else
+ {
+ fsl->list[0] = old;
+ fsl->count = 1;
+ }
+ }
+ else if (fsl->count < DL_SCOPE_FREE_LIST_SIZE)
+ fsl->list[fsl->count++] = old;
+ else
+ {
+ THREAD_GSCOPE_WAIT ();
+ while (fsl->count > 0)
+ free (fsl->list[--fsl->count]);
+ return 1;
+ }
+ return 0;
+}
static void
dl_open_worker (void *a)
struct dl_open_args *args = a;
const char *file = args->file;
int mode = args->mode;
- struct link_map *new, *l;
- int lazy;
- unsigned int i;
-#ifdef USE_TLS
- bool any_tls = false;
-#endif
struct link_map *call_map = NULL;
/* Check whether _dl_open() has been called from a valid DSO. */
By default we assume this is the main application. */
call_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
- for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
+ struct link_map *l;
+ for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
if (caller_dlopen >= (const void *) l->l_map_start
- && caller_dlopen < (const void *) l->l_map_end)
+ && caller_dlopen < (const void *) l->l_map_end
+ && (l->l_contiguous
+ || _dl_addr_inside_object (l, (ElfW(Addr)) caller_dlopen)))
{
- /* There must be exactly one DSO for the range of the virtual
- memory. Otherwise something is really broken. */
assert (ns == l->l_ns);
call_map = l;
goto found_caller;
if (__builtin_expect (dst != NULL, 0))
{
size_t len = strlen (file);
- size_t required;
- char *new_file;
-
- /* DSTs must not appear in SUID/SGID programs. */
- if (INTUSE(__libc_enable_secure))
- /* This is an error. */
- _dl_signal_error (0, "dlopen", NULL,
- N_("DST not allowed in SUID/SGID programs"));
-
/* Determine how much space we need. We have to allocate the
memory locally. */
- required = DL_DST_REQUIRED (call_map, file, len, _dl_dst_count (dst, 0));
+ size_t required = DL_DST_REQUIRED (call_map, file, len,
+ _dl_dst_count (dst, 0));
/* Get space for the new file name. */
- new_file = (char *) alloca (required + 1);
+ char *new_file = (char *) alloca (required + 1);
/* Generate the new file name. */
_dl_dst_substitute (call_map, file, new_file, 0);
}
/* Load the named object. */
+ struct link_map *new;
args->map = new = _dl_map_object (call_map, file, 0, lt_loaded, 0,
mode | __RTLD_CALLMAP, args->nsid);
{
/* Let the user know about the opencount. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
- _dl_debug_printf ("opening file=%s [%lu]; opencount=%u\n\n",
- new->l_name, new->l_ns, new->l_opencount + 1);
+ _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
+ new->l_name, new->l_ns, new->l_direct_opencount);
/* If the user requested the object to be in the global namespace
but it is not so far, add it now. */
if ((mode & RTLD_GLOBAL) && new->l_global == 0)
(void) add_to_global (new);
- if (new->l_direct_opencount == 1)
- /* This is the only direct reference. Increment all the
- dependencies' reference counter. */
- for (i = 0; i < new->l_searchlist.r_nlist; ++i)
- ++new->l_searchlist.r_list[i]->l_opencount;
- else
- /* Increment just the reference counter of the object. */
- ++new->l_opencount;
-
assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
return;
mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));
/* So far, so good. Now check the versions. */
- for (i = 0; i < new->l_searchlist.r_nlist; ++i)
+ for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
if (new->l_searchlist.r_list[i]->l_real->l_versions == NULL)
(void) _dl_check_map_versions (new->l_searchlist.r_list[i]->l_real,
0, 0);
_dl_debug_state ();
/* Only do lazy relocation if `LD_BIND_NOW' is not set. */
- lazy = (mode & RTLD_BINDING_MASK) == RTLD_LAZY && GLRO(dl_lazy);
+ int reloc_mode = mode & __RTLD_AUDIT;
+ if (GLRO(dl_lazy))
+ reloc_mode |= mode & RTLD_LAZY;
/* Relocate the objects loaded. We do this in reverse order so that copy
relocs of earlier objects overwrite the data written by later objects. */
- l = new;
+ struct link_map *l = new;
while (l->l_next)
l = l->l_next;
while (1)
if (! l->l_real->l_relocated)
{
#ifdef SHARED
- if (GLRO(dl_profile) != NULL)
+ if (__builtin_expect (GLRO(dl_profile) != NULL, 0))
{
/* If this here is the shared object which we want to profile
make sure the profile is started. We can find out whether
start the profiling. */
struct link_map *old_profile_map = GL(dl_profile_map);
- _dl_relocate_object (l, l->l_scope, 1, 1);
+ _dl_relocate_object (l, l->l_scope, reloc_mode | RTLD_LAZY, 1);
if (old_profile_map == NULL && GL(dl_profile_map) != NULL)
{
}
else
#endif
- _dl_relocate_object (l, l->l_scope, lazy, 0);
+ _dl_relocate_object (l, l->l_scope, reloc_mode, 0);
}
if (l == new)
l = l->l_prev;
}
- /* Increment the open count for all dependencies. If the file is
- not loaded as a dependency here add the search list of the newly
- loaded object to the scope. */
- for (i = 0; i < new->l_searchlist.r_nlist; ++i)
- if (++new->l_searchlist.r_list[i]->l_opencount > 1
- && new->l_real->l_searchlist.r_list[i]->l_type == lt_loaded)
- {
- struct link_map *imap = new->l_searchlist.r_list[i];
- struct r_scope_elem **runp = imap->l_scope;
- size_t cnt = 0;
-
- while (*runp != NULL)
- {
- /* This can happen if imap was just loaded, but during
- relocation had l_opencount bumped because of relocation
- dependency. Avoid duplicates in l_scope. */
- if (__builtin_expect (*runp == &new->l_searchlist, 0))
- break;
-
- ++cnt;
- ++runp;
- }
-
- if (*runp != NULL)
- /* Avoid duplicates. */
- continue;
-
- if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))
- {
- /* The 'r_scope' array is too small. Allocate a new one
- dynamically. */
- struct r_scope_elem **newp;
- size_t new_size = imap->l_scope_max * 2;
-
- if (imap->l_scope == imap->l_scope_mem)
- {
- newp = (struct r_scope_elem **)
- malloc (new_size * sizeof (struct r_scope_elem *));
- if (newp == NULL)
- _dl_signal_error (ENOMEM, "dlopen", NULL,
- N_("cannot create scope list"));
- imap->l_scope = memcpy (newp, imap->l_scope,
- cnt * sizeof (imap->l_scope[0]));
- }
- else
- {
- newp = (struct r_scope_elem **)
- realloc (imap->l_scope,
- new_size * sizeof (struct r_scope_elem *));
- if (newp == NULL)
- _dl_signal_error (ENOMEM, "dlopen", NULL,
- N_("cannot create scope list"));
- imap->l_scope = newp;
- }
-
- imap->l_scope_max = new_size;
- }
-
- imap->l_scope[cnt++] = &new->l_searchlist;
- imap->l_scope[cnt] = NULL;
- }
-#if USE_TLS
- else if (new->l_searchlist.r_list[i]->l_opencount == 1
- /* Only if the module defines thread local data. */
- && __builtin_expect (new->l_searchlist.r_list[i]->l_tls_blocksize
- > 0, 0))
- {
- /* Now that we know the object is loaded successfully add
- modules containing TLS data to the slot info table. We
- might have to increase its size. */
- _dl_add_to_slotinfo (new->l_searchlist.r_list[i]);
-
- if (new->l_searchlist.r_list[i]->l_need_tls_init)
- {
- new->l_searchlist.r_list[i]->l_need_tls_init = 0;
-# ifdef SHARED
- /* Update the slot information data for at least the
- generation of the DSO we are allocating data for. */
- _dl_update_slotinfo (new->l_searchlist.r_list[i]->l_tls_modid);
-# endif
-
- GL(dl_init_static_tls) (new->l_searchlist.r_list[i]);
- assert (new->l_searchlist.r_list[i]->l_need_tls_init == 0);
- }
-
- /* We have to bump the generation counter. */
- any_tls = true;
- }
+ /* If the file is not loaded now as a dependency, add the search
+ list of the newly loaded object to the scope. */
+ bool any_tls = false;
+ for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
+ {
+ struct link_map *imap = new->l_searchlist.r_list[i];
+
+ /* If the initializer has been called already, the object has
+ not been loaded here and now. */
+ if (imap->l_init_called && imap->l_type == lt_loaded)
+ {
+ struct r_scope_elem **runp = imap->l_scope;
+ size_t cnt = 0;
+
+ while (*runp != NULL)
+ {
+ if (*runp == &new->l_searchlist)
+ break;
+ ++cnt;
+ ++runp;
+ }
+
+ if (*runp != NULL)
+ /* Avoid duplicates. */
+ continue;
+
+ if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))
+ {
+ /* The 'r_scope' array is too small. Allocate a new one
+ dynamically. */
+ size_t new_size;
+ struct r_scope_elem **newp;
+
+#define SCOPE_ELEMS(imap) \
+ (sizeof (imap->l_scope_mem) / sizeof (imap->l_scope_mem[0]))
+
+ if (imap->l_scope != imap->l_scope_mem
+ && imap->l_scope_max < SCOPE_ELEMS (imap))
+ {
+ new_size = SCOPE_ELEMS (imap);
+ newp = imap->l_scope_mem;
+ }
+ else
+ {
+ new_size = imap->l_scope_max * 2;
+ newp = (struct r_scope_elem **)
+ malloc (new_size * sizeof (struct r_scope_elem *));
+ if (newp == NULL)
+ _dl_signal_error (ENOMEM, "dlopen", NULL,
+ N_("cannot create scope list"));
+ }
+
+ memcpy (newp, imap->l_scope, cnt * sizeof (imap->l_scope[0]));
+ struct r_scope_elem **old = imap->l_scope;
+
+ imap->l_scope = newp;
+
+ if (old != imap->l_scope_mem)
+ _dl_scope_free (old);
+
+ imap->l_scope_max = new_size;
+ }
+
+ /* First terminate the extended list. Otherwise a thread
+ might use the new last element and then use the garbage
+ at offset IDX+1. */
+ imap->l_scope[cnt + 1] = NULL;
+ atomic_write_barrier ();
+ imap->l_scope[cnt] = &new->l_searchlist;
+ }
+ /* Only add TLS memory if this object is loaded now and
+ therefore is not yet initialized. */
+ else if (! imap->l_init_called
+ /* Only if the module defines thread local data. */
+ && __builtin_expect (imap->l_tls_blocksize > 0, 0))
+ {
+ /* Now that we know the object is loaded successfully add
+ modules containing TLS data to the slot info table. We
+ might have to increase its size. */
+ _dl_add_to_slotinfo (imap);
+
+ if (imap->l_need_tls_init)
+ {
+ imap->l_need_tls_init = 0;
+#ifdef SHARED
+ /* Update the slot information data for at least the
+ generation of the DSO we are allocating data for. */
+ _dl_update_slotinfo (imap->l_tls_modid);
+#endif
+
+ GL(dl_init_static_tls) (imap);
+ assert (imap->l_need_tls_init == 0);
+ }
+
+ /* We have to bump the generation counter. */
+ any_tls = true;
+ }
+ }
/* Bump the generation number if necessary. */
if (any_tls && __builtin_expect (++GL(dl_tls_generation) == 0, 0))
_dl_fatal_printf (N_("\
TLS generation counter wrapped! Please report this."));
-#endif
/* Run the initializer functions of new objects. */
_dl_init (new, args->argc, args->argv, args->env);
/* Let the user know about the opencount. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
- _dl_debug_printf ("opening file=%s [%lu]; opencount=%u\n\n",
- new->l_name, new->l_ns, new->l_opencount);
+ _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
+ new->l_name, new->l_ns, new->l_direct_opencount);
}
_dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid,
int argc, char *argv[], char *env[])
{
- struct dl_open_args args;
- const char *objname;
- const char *errstring;
- int errcode;
-
if ((mode & RTLD_BINDING_MASK) == 0)
/* One of the flags must be set. */
_dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));
/* Make sure we are alone. */
__rtld_lock_lock_recursive (GL(dl_load_lock));
- if (nsid == LM_ID_NEWLM)
+ if (__builtin_expect (nsid == LM_ID_NEWLM, 0))
{
/* Find a new namespace. */
- for (nsid = 1; nsid < DL_NNS; ++nsid)
+ for (nsid = 1; nsid < GL(dl_nns); ++nsid)
if (GL(dl_ns)[nsid]._ns_loaded == NULL)
break;
no more namespaces available for dlmopen()"));
}
+ if (nsid == GL(dl_nns))
+ ++GL(dl_nns);
+
_dl_debug_initialize (0, nsid)->r_state = RT_CONSISTENT;
}
/* Never allow loading a DSO in a namespace which is empty. Such
direct placements is only causing problems. Also don't allow
loading into a namespace used for auditing. */
- else if (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER
+ else if (__builtin_expect (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER, 0)
&& (GL(dl_ns)[nsid]._ns_nloaded == 0
|| GL(dl_ns)[nsid]._ns_loaded->l_auditing))
_dl_signal_error (EINVAL, file, NULL,
N_("invalid target namespace in dlmopen()"));
+#ifndef SHARED
+ else if ((nsid == LM_ID_BASE || nsid == __LM_ID_CALLER)
+ && GL(dl_ns)[LM_ID_BASE]._ns_loaded == NULL
+ && GL(dl_nns) == 0)
+ GL(dl_nns) = 1;
+#endif
+ struct dl_open_args args;
args.file = file;
args.mode = mode;
args.caller_dlopen = caller_dlopen;
args.argc = argc;
args.argv = argv;
args.env = env;
- errcode = _dl_catch_error (&objname, &errstring, dl_open_worker, &args);
+
+ const char *objname;
+ const char *errstring;
+ bool malloced;
+ int errcode = _dl_catch_error (&objname, &errstring, &malloced,
+ dl_open_worker, &args);
#ifndef MAP_COPY
/* We must munmap() the cache file. */
_dl_unload_cache ();
#endif
- /* Release the lock. */
- __rtld_lock_unlock_recursive (GL(dl_load_lock));
-
+ /* See if an error occurred during loading. */
if (__builtin_expect (errstring != NULL, 0))
{
- /* Some error occurred during loading. */
- char *local_errstring;
- size_t len_errstring;
-
/* Remove the object from memory. It may be in an inconsistent
state if relocation failed, for example. */
if (args.map)
{
- /* Increment open counters for all objects since this
- sometimes has not happened yet. */
- if (args.map->l_searchlist.r_list[0]->l_opencount == 0)
- for (unsigned int i = 0; i < args.map->l_searchlist.r_nlist; ++i)
- ++args.map->l_searchlist.r_list[i]->l_opencount;
-
-#ifdef USE_TLS
/* Maybe some of the modules which were loaded use TLS.
Since it will be removed in the following _dl_close call
we have to mark the dtv array as having gaps to fill the
up. */
if ((mode & __RTLD_AUDIT) == 0)
GL(dl_tls_dtv_gaps) = true;
-#endif
- _dl_close (args.map);
+ _dl_close_worker (args.map);
}
+ assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
+
+ /* Release the lock. */
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+
/* Make a local copy of the error string so that we can release the
memory allocated for it. */
- len_errstring = strlen (errstring) + 1;
+ size_t len_errstring = strlen (errstring) + 1;
+ char *local_errstring;
if (objname == errstring + len_errstring)
{
size_t total_len = len_errstring + strlen (objname) + 1;
memcpy (local_errstring, errstring, len_errstring);
}
- if (errstring != _dl_out_of_memory)
+ if (malloced)
free ((char *) errstring);
- assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
-
/* Reraise the error. */
_dl_signal_error (errcode, objname, NULL, local_errstring);
}
assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
+ /* Release the lock. */
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+
#ifndef SHARED
DL_STATIC_INIT (args.map);
#endif
}
}
#endif
+
+#ifdef IS_IN_rtld
+/* Return non-zero if ADDR lies within one of L's segments. */
+int
+internal_function
+_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
+{
+ int n = l->l_phnum;
+ const ElfW(Addr) reladdr = addr - l->l_addr;
+
+ while (--n >= 0)
+ if (l->l_phdr[n].p_type == PT_LOAD
+ && reladdr - l->l_phdr[n].p_vaddr >= 0
+ && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
+ return 1;
+ return 0;
+}
+#endif
projects / platform / upstream / glibc.git / blobdiff