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/* Storage management for the chain of loaded shared objects.
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Copyright (C) 1995-2018 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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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <assert.h>
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/* Add the new link_map NEW to the end of the namespace list. */
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void
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_dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
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{
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/* We modify the list of loaded objects. */
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__rtld_lock_lock_recursive (GL(dl_load_write_lock));
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if (GL(dl_ns)[nsid]._ns_loaded != NULL)
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{
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struct link_map *l = GL(dl_ns)[nsid]._ns_loaded;
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while (l->l_next != NULL)
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l = l->l_next;
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new->l_prev = l;
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/* new->l_next = NULL; Would be necessary but we use calloc. */
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l->l_next = new;
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}
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else
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GL(dl_ns)[nsid]._ns_loaded = new;
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++GL(dl_ns)[nsid]._ns_nloaded;
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new->l_serial = GL(dl_load_adds);
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++GL(dl_load_adds);
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__rtld_lock_unlock_recursive (GL(dl_load_write_lock));
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}
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/* Allocate a `struct link_map' for a new object being loaded,
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and enter it into the _dl_loaded list. */
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struct link_map *
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_dl_new_object (char *realname, const char *libname, int type,
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struct link_map *loader, int mode, Lmid_t nsid)
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{
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#ifdef SHARED
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unsigned int naudit;
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if (__glibc_unlikely ((mode & __RTLD_OPENEXEC) != 0))
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{
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assert (type == lt_executable);
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assert (nsid == LM_ID_BASE);
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/* Ignore the specified libname for the main executable. It is
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only known with an explicit loader invocation. */
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libname = "";
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/* We create the map for the executable before we know whether
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we have auditing libraries and if yes, how many. Assume the
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worst. */
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naudit = DL_NNS;
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}
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else
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naudit = GLRO (dl_naudit);
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#endif
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size_t libname_len = strlen (libname) + 1;
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struct link_map *new;
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struct libname_list *newname;
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#ifdef SHARED
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dd92fb |
size_t audit_space = naudit * sizeof (struct auditstate);
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#else
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# define audit_space 0
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#endif
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new = (struct link_map *) calloc (sizeof (*new) + audit_space
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+ sizeof (struct link_map *)
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+ sizeof (*newname) + libname_len, 1);
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if (new == NULL)
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return NULL;
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new->l_real = new;
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new->l_symbolic_searchlist.r_list = (struct link_map **) ((char *) (new + 1)
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+ audit_space);
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new->l_libname = newname
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= (struct libname_list *) (new->l_symbolic_searchlist.r_list + 1);
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newname->name = (char *) memcpy (newname + 1, libname, libname_len);
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/* newname->next = NULL; We use calloc therefore not necessary. */
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newname->dont_free = 1;
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/* When we create the executable link map, or a VDSO link map, we start
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with "" for the l_name. In these cases "" points to ld.so rodata
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and won't get dumped during core file generation. Therefore to assist
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gdb and to create more self-contained core files we adjust l_name to
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point at the newly allocated copy (which will get dumped) instead of
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the ld.so rodata copy.
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Furthermore, in case of explicit loader invocation, discard the
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name of the main executable, to match the regular behavior, where
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name of the executable is not known. */
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#ifdef SHARED
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if (*realname != '\0' && (mode & __RTLD_OPENEXEC) == 0)
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#else
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if (*realname != '\0')
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#endif
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new->l_name = realname;
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else
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new->l_name = (char *) newname->name + libname_len - 1;
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new->l_type = type;
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/* If we set the bit now since we know it is never used we avoid
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dirtying the cache line later. */
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if ((GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) == 0)
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new->l_used = 1;
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new->l_loader = loader;
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#if NO_TLS_OFFSET != 0
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new->l_tls_offset = NO_TLS_OFFSET;
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#endif
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new->l_ns = nsid;
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#ifdef SHARED
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for (unsigned int cnt = 0; cnt < naudit; ++cnt)
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/* No need to initialize bindflags due to calloc. */
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link_map_audit_state (new, cnt)->cookie = (uintptr_t) new;
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#endif
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/* new->l_global = 0; We use calloc therefore not necessary. */
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/* Use the 'l_scope_mem' array by default for the 'l_scope'
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information. If we need more entries we will allocate a large
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array dynamically. */
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new->l_scope = new->l_scope_mem;
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new->l_scope_max = sizeof (new->l_scope_mem) / sizeof (new->l_scope_mem[0]);
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/* Counter for the scopes we have to handle. */
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int idx = 0;
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if (GL(dl_ns)[nsid]._ns_loaded != NULL)
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/* Add the global scope. */
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new->l_scope[idx++] = &GL(dl_ns)[nsid]._ns_loaded->l_searchlist;
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/* If we have no loader the new object acts as it. */
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if (loader == NULL)
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loader = new;
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else
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/* Determine the local scope. */
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while (loader->l_loader != NULL)
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loader = loader->l_loader;
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/* Insert the scope if it isn't the global scope we already added. */
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if (idx == 0 || &loader->l_searchlist != new->l_scope[0])
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{
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if ((mode & RTLD_DEEPBIND) != 0 && idx != 0)
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{
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new->l_scope[1] = new->l_scope[0];
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idx = 0;
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}
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new->l_scope[idx] = &loader->l_searchlist;
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}
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new->l_local_scope[0] = &new->l_searchlist;
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/* Determine the origin. If allocating the link map for the main
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6016f2 |
executable, the realname is not known and "". In this case, the
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6016f2 |
origin needs to be determined by other means. However, in case
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6016f2 |
of an explicit loader invocation, the pathname of the main
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6016f2 |
executable is known and needs to be processed here: From the
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6016f2 |
point of view of the kernel, the main executable is the
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6016f2 |
dynamic loader, and this would lead to a computation of the wrong
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6016f2 |
origin. */
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if (realname[0] != '\0')
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{
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size_t realname_len = strlen (realname) + 1;
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char *origin;
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char *cp;
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if (realname[0] == '/')
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{
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/* It is an absolute path. Use it. But we have to make a
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copy since we strip out the trailing slash. */
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cp = origin = (char *) malloc (realname_len);
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if (origin == NULL)
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{
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origin = (char *) -1;
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goto out;
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}
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}
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else
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{
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size_t len = realname_len;
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char *result = NULL;
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/* Get the current directory name. */
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origin = NULL;
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do
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{
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char *new_origin;
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len += 128;
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new_origin = (char *) realloc (origin, len);
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if (new_origin == NULL)
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/* We exit the loop. Note that result == NULL. */
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break;
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origin = new_origin;
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}
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while ((result = __getcwd (origin, len - realname_len)) == NULL
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&& errno == ERANGE);
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if (result == NULL)
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{
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/* We were not able to determine the current directory.
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Note that free(origin) is OK if origin == NULL. */
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free (origin);
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origin = (char *) -1;
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goto out;
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}
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/* Find the end of the path and see whether we have to add a
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6c4009 |
slash. We could use rawmemchr but this need not be
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fast. */
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cp = (strchr) (origin, '\0');
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if (cp[-1] != '/')
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*cp++ = '/';
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}
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/* Add the real file name. */
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cp = __mempcpy (cp, realname, realname_len);
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6c4009 |
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/* Now remove the filename and the slash. Leave the slash if
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6c4009 |
the name is something like "/foo". */
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do
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--cp;
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6c4009 |
while (*cp != '/');
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6c4009 |
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6c4009 |
if (cp == origin)
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6c4009 |
/* Keep the only slash which is the first character. */
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6c4009 |
++cp;
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*cp = '\0';
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6c4009 |
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out:
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new->l_origin = origin;
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6c4009 |
}
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6c4009 |
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return new;
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6c4009 |
}
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