/* Storage management for the chain of loaded shared objects.
- Copyright (C) 1995-2002,2004,2006-2008,2009 Free Software Foundation, Inc.
+ Copyright (C) 1995-2022 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <assert.h>
+/* Add the new link_map NEW to the end of the namespace list. */
+void
+_dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
+{
+ /* We modify the list of loaded objects. */
+ __rtld_lock_lock_recursive (GL(dl_load_write_lock));
+
+ if (GL(dl_ns)[nsid]._ns_loaded != NULL)
+ {
+ struct link_map *l = GL(dl_ns)[nsid]._ns_loaded;
+ while (l->l_next != NULL)
+ l = l->l_next;
+ new->l_prev = l;
+ /* new->l_next = NULL; Would be necessary but we use calloc. */
+ l->l_next = new;
+ }
+ else
+ GL(dl_ns)[nsid]._ns_loaded = new;
+ ++GL(dl_ns)[nsid]._ns_nloaded;
+ new->l_serial = GL(dl_load_adds);
+ ++GL(dl_load_adds);
+
+ __rtld_lock_unlock_recursive (GL(dl_load_write_lock));
+}
+
+
/* Allocate a `struct link_map' for a new object being loaded,
and enter it into the _dl_loaded list. */
-
struct link_map *
-internal_function
_dl_new_object (char *realname, const char *libname, int type,
struct link_map *loader, int mode, Lmid_t nsid)
{
- struct link_map *l;
- int idx;
+#ifdef SHARED
+ unsigned int naudit;
+ if (__glibc_unlikely ((mode & (__RTLD_OPENEXEC | __RTLD_VDSO)) != 0))
+ {
+ if (mode & __RTLD_OPENEXEC)
+ {
+ assert (type == lt_executable);
+ assert (nsid == LM_ID_BASE);
+
+ /* Ignore the specified libname for the main executable. It is
+ only known with an explicit loader invocation. */
+ libname = "";
+ }
+
+ /* We create the map for the executable and vDSO before we know whether
+ we have auditing libraries and if yes, how many. Assume the
+ worst. */
+ naudit = DL_NNS;
+ }
+ else
+ naudit = GLRO (dl_naudit);
+#endif
+
size_t libname_len = strlen (libname) + 1;
struct link_map *new;
struct libname_list *newname;
#ifdef SHARED
- /* We create the map for the executable before we know whether we have
- auditing libraries and if yes, how many. Assume the worst. */
- unsigned int naudit = GLRO(dl_naudit) ?: ((mode & __RTLD_OPENEXEC)
- ? DL_NNS : 0);
- size_t audit_space = naudit * sizeof (new->l_audit[0]);
+ size_t audit_space = naudit * sizeof (struct auditstate);
#else
# define audit_space 0
#endif
/* newname->next = NULL; We use calloc therefore not necessary. */
newname->dont_free = 1;
- new->l_name = realname;
+ /* When we create the executable link map, or a VDSO link map, we start
+ with "" for the l_name. In these cases "" points to ld.so rodata
+ and won't get dumped during core file generation. Therefore to assist
+ gdb and to create more self-contained core files we adjust l_name to
+ point at the newly allocated copy (which will get dumped) instead of
+ the ld.so rodata copy.
+
+ Furthermore, in case of explicit loader invocation, discard the
+ name of the main executable, to match the regular behavior, where
+ name of the executable is not known. */
+#ifdef SHARED
+ if (*realname != '\0' && (mode & __RTLD_OPENEXEC) == 0)
+#else
+ if (*realname != '\0')
+#endif
+ new->l_name = realname;
+ else
+ new->l_name = (char *) newname->name + libname_len - 1;
+
new->l_type = type;
/* If we set the bit now since we know it is never used we avoid
dirtying the cache line later. */
#ifdef SHARED
for (unsigned int cnt = 0; cnt < naudit; ++cnt)
- {
- new->l_audit[cnt].cookie = (uintptr_t) new;
- /* new->l_audit[cnt].bindflags = 0; */
- }
+ /* No need to initialize bindflags due to calloc. */
+ link_map_audit_state (new, cnt)->cookie = (uintptr_t) new;
#endif
/* new->l_global = 0; We use calloc therefore not necessary. */
- /* Use the 'l_scope_mem' array by default for the the 'l_scope'
+ /* Use the 'l_scope_mem' array by default for the 'l_scope'
information. If we need more entries we will allocate a large
array dynamically. */
new->l_scope = new->l_scope_mem;
new->l_scope_max = sizeof (new->l_scope_mem) / sizeof (new->l_scope_mem[0]);
- /* We modify the list of loaded objects. */
- __rtld_lock_lock_recursive (GL(dl_load_write_lock));
-
/* Counter for the scopes we have to handle. */
- idx = 0;
+ int idx = 0;
if (GL(dl_ns)[nsid]._ns_loaded != NULL)
- {
- l = GL(dl_ns)[nsid]._ns_loaded;
- while (l->l_next != NULL)
- l = l->l_next;
- new->l_prev = l;
- /* new->l_next = NULL; Would be necessary but we use calloc. */
- l->l_next = new;
-
- /* Add the global scope. */
- new->l_scope[idx++] = &GL(dl_ns)[nsid]._ns_loaded->l_searchlist;
- }
- else
- GL(dl_ns)[nsid]._ns_loaded = new;
- ++GL(dl_ns)[nsid]._ns_nloaded;
- new->l_serial = GL(dl_load_adds);
- ++GL(dl_load_adds);
-
- __rtld_lock_unlock_recursive (GL(dl_load_write_lock));
+ /* Add the global scope. */
+ new->l_scope[idx++] = &GL(dl_ns)[nsid]._ns_loaded->l_searchlist;
/* If we have no loader the new object acts as it. */
if (loader == NULL)
new->l_local_scope[0] = &new->l_searchlist;
- /* Don't try to find the origin for the main map which has the name "". */
+ /* Determine the origin. If allocating the link map for the main
+ executable, the realname is not known and "". In this case, the
+ origin needs to be determined by other means. However, in case
+ of an explicit loader invocation, the pathname of the main
+ executable is known and needs to be processed here: From the
+ point of view of the kernel, the main executable is the
+ dynamic loader, and this would lead to a computation of the wrong
+ origin. */
if (realname[0] != '\0')
{
size_t realname_len = strlen (realname) + 1;
projects / thirdparty / glibc.git / blobdiff