/* Run time dynamic linker.
- Copyright (C) 1995-2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 1995-2014 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
+ <http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <dlfcn.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <ldsodefs.h>
-#include <stdio-common/_itoa.h>
+#include <_itoa.h>
#include <entry.h>
#include <fpu_control.h>
#include <hp-timing.h>
#include <dl-osinfo.h>
#include <dl-procinfo.h>
#include <tls.h>
+#include <stap-probe.h>
+#include <stackinfo.h>
#include <assert.h>
(except those which cannot be added for some reason). */
struct rtld_global _rtld_global =
{
- /* Default presumption without further information is executable stack. */
- ._dl_stack_flags = PF_R|PF_W|PF_X,
+ /* Generally the default presumption without further information is an
+ * executable stack but this is not true for all platforms. */
+ ._dl_stack_flags = DEFAULT_STACK_PERMS,
#ifdef _LIBC_REENTRANT
._dl_load_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER,
._dl_load_write_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER,
._dl_nns = 1,
._dl_ns =
{
+#ifdef _LIBC_REENTRANT
[LM_ID_BASE] = { ._ns_unique_sym_table
= { .lock = _RTLD_LOCK_RECURSIVE_INITIALIZER } }
+#endif
}
};
/* If we would use strong_alias here the compiler would see a
._dl_lazy = 1,
._dl_fpu_control = _FPU_DEFAULT,
._dl_pointer_guard = 1,
+ ._dl_pagesize = EXEC_PAGESIZE,
+ ._dl_inhibit_cache = 0,
/* Function pointers. */
._dl_debug_printf = _dl_debug_printf,
# error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START"
#endif
-#ifndef VALIDX
-# define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
- + DT_EXTRANUM + DT_VALTAGIDX (tag))
-#endif
-#ifndef ADDRIDX
-# define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
- + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
-#endif
-
/* This is the second half of _dl_start (below). It can be inlined safely
under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT
references. When the tools don't permit us to avoid using a GOT entry
/* Relocate ourselves so we can do normal function calls and
data access using the global offset table. */
- ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0);
+ ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0, 0);
}
bootstrap_map.l_relocated = 1;
/* And finally install it for the main thread. If ld.so itself uses
TLS we know the thread pointer was initialized earlier. */
- const char *lossage = TLS_INIT_TP (tcbp, USE___THREAD);
+ const char *lossage
+#ifdef USE___THREAD
+ = TLS_INIT_TP (tcbp, USE___THREAD);
+#else
+ = TLS_INIT_TP (tcbp, 0);
+#endif
if (__builtin_expect (lossage != NULL, 0))
_dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage);
tls_init_tp_called = true;
if (__builtin_expect (err_str != NULL, 0))
{
_dl_error_printf ("\
-ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n",
- fname, where);
+ERROR: ld.so: object '%s' from %s cannot be preloaded (%s): ignored.\n",
+ fname, where, err_str);
/* No need to call free, this is still before
the libc's malloc is used. */
}
_dl_random = NULL;
}
+#include "setup-vdso.h"
/* The library search path. */
static const char *library_path attribute_relro;
{
mode = verify;
+ ++_dl_skip_args;
+ --_dl_argc;
+ ++INTUSE(_dl_argv);
+ }
+ else if (! strcmp (INTUSE(_dl_argv)[1], "--inhibit-cache"))
+ {
+ GLRO(dl_inhibit_cache) = 1;
++_dl_skip_args;
--_dl_argc;
++INTUSE(_dl_argv);
--list list all dependencies and how they are resolved\n\
--verify verify that given object really is a dynamically linked\n\
object we can handle\n\
+ --inhibit-cache Do not use " LD_SO_CACHE "\n\
--library-path PATH use given PATH instead of content of the environment\n\
variable LD_LIBRARY_PATH\n\
--inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\
/* Now the map for the main executable is available. */
main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
+ if (__builtin_expect (mode, normal) == normal
+ && GL(dl_rtld_map).l_info[DT_SONAME] != NULL
+ && main_map->l_info[DT_SONAME] != NULL
+ && strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB])
+ + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val,
+ (const char *) D_PTR (main_map, l_info[DT_STRTAB])
+ + main_map->l_info[DT_SONAME]->d_un.d_val) == 0)
+ _dl_fatal_printf ("loader cannot load itself\n");
+
phdr = main_map->l_phdr;
phnum = main_map->l_phnum;
/* We overwrite here a pointer to a malloc()ed string. But since
case AT_ENTRY:
av->a_un.a_val = *user_entry;
break;
+ case AT_EXECFN:
+ av->a_un.a_val = (uintptr_t) _dl_argv[0];
+ break;
}
#endif
}
main_map = _dl_new_object ((char *) "", "", lt_executable, NULL,
__RTLD_OPENEXEC, LM_ID_BASE);
assert (main_map != NULL);
- assert (main_map == GL(dl_ns)[LM_ID_BASE]._ns_loaded);
main_map->l_phdr = phdr;
main_map->l_phnum = phnum;
main_map->l_entry = *user_entry;
/* Even though the link map is not yet fully initialized we can add
it to the map list since there are no possible users running yet. */
_dl_add_to_namespace_list (main_map, LM_ID_BASE);
+ assert (main_map == GL(dl_ns)[LM_ID_BASE]._ns_loaded);
/* At this point we are in a bit of trouble. We would have to
fill in the values for l_dev and l_ino. But in general we
}
struct link_map **first_preload = &GL(dl_rtld_map).l_next;
-#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
/* Set up the data structures for the system-supplied DSO early,
so they can influence _dl_init_paths. */
- if (GLRO(dl_sysinfo_dso) != NULL)
- {
- /* Do an abridged version of the work _dl_map_object_from_fd would do
- to map in the object. It's already mapped and prelinked (and
- better be, since it's read-only and so we couldn't relocate it).
- We just want our data structures to describe it as if we had just
- mapped and relocated it normally. */
- struct link_map *l = _dl_new_object ((char *) "", "", lt_library, NULL,
- 0, LM_ID_BASE);
- if (__builtin_expect (l != NULL, 1))
- {
- static ElfW(Dyn) dyn_temp[DL_RO_DYN_TEMP_CNT] attribute_relro;
-
- l->l_phdr = ((const void *) GLRO(dl_sysinfo_dso)
- + GLRO(dl_sysinfo_dso)->e_phoff);
- l->l_phnum = GLRO(dl_sysinfo_dso)->e_phnum;
- for (uint_fast16_t i = 0; i < l->l_phnum; ++i)
- {
- const ElfW(Phdr) *const ph = &l->l_phdr[i];
- if (ph->p_type == PT_DYNAMIC)
- {
- l->l_ld = (void *) ph->p_vaddr;
- l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn));
- }
- else if (ph->p_type == PT_LOAD)
- {
- if (! l->l_addr)
- l->l_addr = ph->p_vaddr;
- if (ph->p_vaddr + ph->p_memsz >= l->l_map_end)
- l->l_map_end = ph->p_vaddr + ph->p_memsz;
- if ((ph->p_flags & PF_X)
- && ph->p_vaddr + ph->p_memsz >= l->l_text_end)
- l->l_text_end = ph->p_vaddr + ph->p_memsz;
- }
- else
- /* There must be no TLS segment. */
- assert (ph->p_type != PT_TLS);
- }
- l->l_map_start = (ElfW(Addr)) GLRO(dl_sysinfo_dso);
- l->l_addr = l->l_map_start - l->l_addr;
- l->l_map_end += l->l_addr;
- l->l_text_end += l->l_addr;
- l->l_ld = (void *) ((ElfW(Addr)) l->l_ld + l->l_addr);
- elf_get_dynamic_info (l, dyn_temp);
- _dl_setup_hash (l);
- l->l_relocated = 1;
-
- /* Initialize l_local_scope to contain just this map. This allows
- the use of dl_lookup_symbol_x to resolve symbols within the vdso.
- So we create a single entry list pointing to l_real as its only
- element */
- l->l_local_scope[0]->r_nlist = 1;
- l->l_local_scope[0]->r_list = &l->l_real;
-
- /* Now that we have the info handy, use the DSO image's soname
- so this object can be looked up by name. Note that we do not
- set l_name here. That field gives the file name of the DSO,
- and this DSO is not associated with any file. */
- if (l->l_info[DT_SONAME] != NULL)
- {
- /* Work around a kernel problem. The kernel cannot handle
- addresses in the vsyscall DSO pages in writev() calls. */
- const char *dsoname = ((char *) D_PTR (l, l_info[DT_STRTAB])
- + l->l_info[DT_SONAME]->d_un.d_val);
- size_t len = strlen (dsoname);
- char *copy = malloc (len);
- if (copy == NULL)
- _dl_fatal_printf ("out of memory\n");
- l->l_libname->name = memcpy (copy, dsoname, len);
- }
-
- /* Add the vDSO to the object list. */
- _dl_add_to_namespace_list (l, LM_ID_BASE);
-
- /* Rearrange the list so this DSO appears after rtld_map. */
- assert (l->l_next == NULL);
- assert (l->l_prev == main_map);
- GL(dl_rtld_map).l_next = l;
- l->l_prev = &GL(dl_rtld_map);
- first_preload = &l->l_next;
-
- /* We have a prelinked DSO preloaded by the system. */
- GLRO(dl_sysinfo_map) = l;
-# ifdef NEED_DL_SYSINFO
- if (GLRO(dl_sysinfo) == DL_SYSINFO_DEFAULT)
- GLRO(dl_sysinfo) = GLRO(dl_sysinfo_dso)->e_entry + l->l_addr;
-# endif
- }
- }
-#endif
+ setup_vdso (main_map, &first_preload);
#ifdef DL_SYSDEP_OSCHECK
- DL_SYSDEP_OSCHECK (dl_fatal);
+ DL_SYSDEP_OSCHECK (_dl_fatal_printf);
#endif
/* Initialize the data structures for the search paths for shared
/* We start adding objects. */
r->r_state = RT_ADD;
_dl_debug_state ();
+ LIBC_PROBE (init_start, 2, LM_ID_BASE, r);
/* Auditing checkpoint: we are ready to signal that the initial map
is being constructed. */
GL(dl_rtld_map).l_next = (i + 1 < main_map->l_searchlist.r_nlist
? main_map->l_searchlist.r_list[i + 1]
: NULL);
-#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
+#ifdef NEED_DL_SYSINFO_DSO
if (GLRO(dl_sysinfo_map) != NULL
&& GL(dl_rtld_map).l_prev->l_next == GLRO(dl_sysinfo_map)
&& GL(dl_rtld_map).l_next != GLRO(dl_sysinfo_map))
if (_dl_name_match_p (GLRO(dl_trace_prelink), l))
GLRO(dl_trace_prelink_map) = l;
_dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)",
- l->l_libname->name[0] ? l->l_libname->name
- : rtld_progname ?: "<main program>",
- l->l_name[0] ? l->l_name
- : rtld_progname ?: "<main program>",
+ DSO_FILENAME (l->l_libname->name),
+ DSO_FILENAME (l->l_name),
(int) sizeof l->l_map_start * 2,
(size_t) l->l_map_start,
(int) sizeof l->l_addr * 2,
/* Relocate the main executable. */
struct relocate_args args = { .l = l,
- .reloc_mode = (GLRO(dl_lazy)
- ? RTLD_LAZY : 0) };
+ .reloc_mode = ((GLRO(dl_lazy)
+ ? RTLD_LAZY : 0)
+ | __RTLD_NOIFUNC) };
_dl_receive_error (print_unresolved, relocate_doit, &args);
/* This loop depends on the dependencies of the executable to
if (dyn->d_tag == DT_NEEDED)
{
l = l->l_next;
-
+#ifdef NEED_DL_SYSINFO_DSO
+ /* Skip the VDSO since it's not part of the list
+ of objects we brought in via DT_NEEDED entries. */
+ if (l == GLRO(dl_sysinfo_map))
+ l = l->l_next;
+#endif
if (!l->l_used)
{
if (first)
{
/* We have to do symbol dependency testing. */
struct relocate_args args;
- struct link_map *l;
+ unsigned int i;
- args.reloc_mode = GLRO(dl_lazy) ? RTLD_LAZY : 0;
+ args.reloc_mode = ((GLRO(dl_lazy) ? RTLD_LAZY : 0)
+ | __RTLD_NOIFUNC);
- l = main_map;
- while (l->l_next != NULL)
- l = l->l_next;
- do
+ i = main_map->l_searchlist.r_nlist;
+ while (i-- > 0)
{
+ struct link_map *l = main_map->l_initfini[i];
if (l != &GL(dl_rtld_map) && ! l->l_faked)
{
args.l = l;
_dl_receive_error (print_unresolved, relocate_doit,
&args);
}
- l = l->l_prev;
}
- while (l != NULL);
if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK)
&& rtld_multiple_ref)
/* Mark the link map as not yet relocated again. */
GL(dl_rtld_map).l_relocated = 0;
_dl_relocate_object (&GL(dl_rtld_map),
- main_map->l_scope, 0, 0);
+ main_map->l_scope, __RTLD_NOIFUNC, 0);
}
}
#define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED))
first = 0;
}
- _dl_printf ("\t%s:\n",
- map->l_name[0] ? map->l_name : rtld_progname);
+ _dl_printf ("\t%s:\n", DSO_FILENAME (map->l_name));
while (1)
{
we need it in the memory handling later. */
GLRO(dl_initial_searchlist) = *GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist;
+ /* Remember the last search directory added at startup, now that
+ malloc will no longer be the one from dl-minimal.c. */
+ GLRO(dl_init_all_dirs) = GL(dl_all_dirs);
+
+ /* Print scope information. */
+ if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
+ {
+ _dl_debug_printf ("\nInitial object scopes\n");
+
+ for (struct link_map *l = main_map; l != NULL; l = l->l_next)
+ _dl_show_scope (l, 0);
+ }
+
if (prelinked)
{
if (main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL)
/* If we are profiling we also must do lazy reloaction. */
GLRO(dl_lazy) |= consider_profiling;
- struct link_map *l = main_map;
- while (l->l_next)
- l = l->l_next;
-
HP_TIMING_NOW (start);
- do
+ unsigned i = main_map->l_searchlist.r_nlist;
+ while (i-- > 0)
{
+ struct link_map *l = main_map->l_initfini[i];
+
/* While we are at it, help the memory handling a bit. We have to
mark some data structures as allocated with the fake malloc()
implementation in ld.so. */
lnp->dont_free = 1;
lnp = lnp->next;
}
+ /* Also allocated with the fake malloc(). */
+ l->l_free_initfini = 0;
if (l != &GL(dl_rtld_map))
_dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0,
/* Add object to slot information data if necessasy. */
if (l->l_tls_blocksize != 0 && tls_init_tp_called)
_dl_add_to_slotinfo (l);
-
- l = l->l_prev;
}
- while (l);
HP_TIMING_NOW (stop);
HP_TIMING_DIFF (relocate_time, start, stop);
_dl_start_profile ();
}
-#ifndef NONTLS_INIT_TP
-# define NONTLS_INIT_TP do { } while (0)
-#endif
-
if (!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0)
++GL(dl_tls_generation);
TLS we know the thread pointer was initialized earlier. */
if (! tls_init_tp_called)
{
- const char *lossage = TLS_INIT_TP (tcbp, USE___THREAD);
+ const char *lossage
+#ifdef USE___THREAD
+ = TLS_INIT_TP (tcbp, USE___THREAD);
+#else
+ = TLS_INIT_TP (tcbp, 0);
+#endif
if (__builtin_expect (lossage != NULL, 0))
_dl_fatal_printf ("cannot set up thread-local storage: %s\n",
lossage);
}
- /* Remember the last search directory added at startup, now that
- malloc will no longer be the one from dl-minimal.c. */
- GLRO(dl_init_all_dirs) = GL(dl_all_dirs);
+ /* Make sure no new search directories have been added. */
+ assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs));
if (! prelinked && rtld_multiple_ref)
{
r = _dl_debug_initialize (0, LM_ID_BASE);
r->r_state = RT_CONSISTENT;
_dl_debug_state ();
+ LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
-#ifndef MAP_COPY
+#if defined USE_LDCONFIG && !defined MAP_COPY
/* We must munmap() the cache file. */
_dl_unload_cache ();
#endif
const char *errstring)
{
if (objname[0] == '\0')
- objname = rtld_progname ?: "<main program>";
+ objname = RTLD_PROGNAME;
_dl_error_printf ("%s (%s)\n", errstring, objname);
}
\f
print_missing_version (int errcode __attribute__ ((unused)),
const char *objname, const char *errstring)
{
- _dl_error_printf ("%s: %s: %s\n", rtld_progname ?: "<program name unknown>",
+ _dl_error_printf ("%s: %s: %s\n", RTLD_PROGNAME,
objname, errstring);
}
\f
DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS },
{ LEN_AND_STR ("versions"), "display version dependencies",
DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS },
+ { LEN_AND_STR ("scopes"), "display scope information",
+ DL_DEBUG_SCOPES },
{ LEN_AND_STR ("all"), "all previous options combined",
DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS
- | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS },
+ | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS
+ | DL_DEBUG_SCOPES },
{ LEN_AND_STR ("statistics"), "display relocation statistics",
DL_DEBUG_STATISTICS },
{ LEN_AND_STR ("unused"), "determined unused DSOs",
++dl_debug;
}
+ if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED)
+ {
+ /* In order to get an accurate picture of whether a particular
+ DT_NEEDED entry is actually used we have to process both
+ the PLT and non-PLT relocation entries. */
+ GLRO(dl_lazy) = 0;
+ }
+
if (GLRO(dl_debug_mask) & DL_DEBUG_HELP)
{
size_t cnt;
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