/* Map in a shared object's segments from the file.
- Copyright (C) 1995-2007, 2009, 2010, 2011 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 <elf.h>
#include <errno.h>
#include <stackinfo.h>
#include <caller.h>
#include <sysdep.h>
+#include <stap-probe.h>
#include <dl-dst.h>
const char *const start = name;
/* Now fill the result path. While copying over the string we keep
- track of the start of the last path element. When we come accross
+ track of the start of the last path element. When we come across
a DST we copy over the value or (if the value is not available)
leave the entire path element out. */
char *wp = result;
if ((len = is_dst (start, name, "ORIGIN", is_path,
INTUSE(__libc_enable_secure))) != 0)
{
-#ifndef SHARED
- if (l == NULL)
- repl = _dl_get_origin ();
- else
-#endif
- repl = l->l_origin;
-
+ repl = l->l_origin;
check_for_trusted = (INTUSE(__libc_enable_secure)
&& l->l_type == lt_executable);
}
static struct r_search_path_elem **
fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
- int check_trusted, const char *what, const char *where)
+ int check_trusted, const char *what, const char *where,
+ struct link_map *l)
{
char *cp;
size_t nelems = 0;
+ char *to_free;
while ((cp = __strsep (&rpath, sep)) != NULL)
{
struct r_search_path_elem *dirp;
+
+ to_free = cp = expand_dynamic_string_token (l, cp, 1);
+
size_t len = strlen (cp);
/* `strsep' can pass an empty string. This has to be
/* Make sure we don't use untrusted directories if we run SUID. */
if (__builtin_expect (check_trusted, 0) && !is_trusted_path (cp, len))
- continue;
+ {
+ free (to_free);
+ continue;
+ }
/* See if this directory is already known. */
for (dirp = GL(dl_all_dirs); dirp != NULL; dirp = dirp->next)
/* Put it in the result array. */
result[nelems++] = dirp;
}
+ free (to_free);
}
/* Terminate the array. */
while (*inhp != '\0');
}
- /* Make a writable copy. At the same time expand possible dynamic
- string tokens. */
- copy = expand_dynamic_string_token (l, rpath, 1);
+ /* Make a writable copy. */
+ copy = local_strdup (rpath);
if (copy == NULL)
{
errstring = N_("cannot create RUNPATH/RPATH copy");
_dl_signal_error (ENOMEM, NULL, NULL, errstring);
}
- fillin_rpath (copy, result, ":", 0, what, where);
+ fillin_rpath (copy, result, ":", 0, what, where, l);
/* Free the copied RPATH string. `fillin_rpath' make own copies if
necessary. */
const char *strp;
struct r_search_path_elem *pelem, **aelem;
size_t round_size;
-#ifdef SHARED
- struct link_map *l;
-#endif
+ struct link_map __attribute__ ((unused)) *l = NULL;
/* Initialize to please the compiler. */
const char *errstring = NULL;
(const void *) (D_PTR (l, l_info[DT_STRTAB])
+ l->l_info[DT_RUNPATH]->d_un.d_val),
l, "RUNPATH");
+ /* During rtld init the memory is allocated by the stub malloc,
+ prevent any attempt to free it by the normal malloc. */
+ l->l_runpath_dirs.malloced = 0;
/* The RPATH is ignored. */
l->l_rpath_dirs.dirs = (void *) -1;
(const void *) (D_PTR (l, l_info[DT_STRTAB])
+ l->l_info[DT_RPATH]->d_un.d_val),
l, "RPATH");
+ /* During rtld init the memory is allocated by the stub
+ malloc, prevent any attempt to free it by the normal
+ malloc. */
l->l_rpath_dirs.malloced = 0;
}
else
(void) fillin_rpath (llp_tmp, env_path_list.dirs, ":;",
INTUSE(__libc_enable_secure), "LD_LIBRARY_PATH",
- NULL);
+ NULL, l);
if (env_path_list.dirs[0] == NULL)
{
static void
__attribute__ ((noreturn, noinline))
lose (int code, int fd, const char *name, char *realname, struct link_map *l,
- const char *msg, struct r_debug *r)
+ const char *msg, struct r_debug *r, Lmid_t nsid)
{
/* The file might already be closed. */
if (fd != -1)
(void) __close (fd);
- if (l->l_origin != (char *) -1l)
- free (l->l_origin);
+ if (l != NULL && l->l_origin != (char *) -1l)
+ free ((char *) l->l_origin);
free (l);
free (realname);
{
r->r_state = RT_CONSISTENT;
_dl_debug_state ();
+ LIBC_PROBE (map_failed, 2, nsid, r);
}
_dl_signal_error (code, name, NULL, msg);
errval = errno;
call_lose:
lose (errval, fd, name, realname, l, errstring,
- make_consistent ? r : NULL);
+ make_consistent ? r : NULL, nsid);
}
/* Look again to see if the real name matched another already loaded. */
linking has not been used before. */
r->r_state = RT_ADD;
_dl_debug_state ();
+ LIBC_PROBE (map_start, 2, nsid, r);
make_consistent = true;
}
else
struct loadcmd
{
ElfW(Addr) mapstart, mapend, dataend, allocend;
- off_t mapoff;
+ ElfW(Off) mapoff;
int prot;
} loadcmds[l->l_phnum], *c;
size_t nloadcmds = 0;
was executed directly. The setup will happen later. */
break;
+# ifdef _LIBC_REENTRANT
/* In a static binary there is no way to tell if we dynamically
loaded libpthread. */
if (GL(dl_error_catch_tsd) == &_dl_initial_error_catch_tsd)
+# endif
#endif
{
/* We have not yet loaded libpthread.
l->l_text_end = l->l_addr + c->mapend;
if (l->l_phdr == 0
- && (ElfW(Off)) c->mapoff <= header->e_phoff
+ && c->mapoff <= header->e_phoff
&& ((size_t) (c->mapend - c->mapstart + c->mapoff)
>= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr))))
/* Found the program header in this segment. */
- l->l_phdr = (void *) (c->mapstart + header->e_phoff - c->mapoff);
+ l->l_phdr = (void *) (uintptr_t) (c->mapstart + header->e_phoff
+ - c->mapoff);
if (c->allocend > c->dataend)
{
if (__builtin_expect (p + s <= relro_end, 1))
{
/* The variable lies in the region protected by RELRO. */
- __mprotect ((void *) p, s, PROT_READ|PROT_WRITE);
+ if (__mprotect ((void *) p, s, PROT_READ|PROT_WRITE) < 0)
+ {
+ errstring = N_("cannot change memory protections");
+ goto call_lose_errno;
+ }
__stack_prot |= PROT_READ|PROT_WRITE|PROT_EXEC;
__mprotect ((void *) p, s, PROT_READ);
}
add_name_to_object (l, ((const char *) D_PTR (l, l_info[DT_STRTAB])
+ l->l_info[DT_SONAME]->d_un.d_val));
+#ifdef DL_AFTER_LOAD
+ DL_AFTER_LOAD (l);
+#endif
+
/* Now that the object is fully initialized add it to the object list. */
_dl_add_to_namespace_list (l, nsid);
if (name != NULL)
_dl_debug_printf_c ("\t\t(%s from file %s)\n", what,
- name[0] ? name : rtld_progname);
+ DSO_FILENAME (name));
else
_dl_debug_printf_c ("\t\t(%s)\n", what);
}
#endif
/* Open the file. We always open files read-only. */
- int fd = __open (name, O_RDONLY);
+ int fd = __open (name, O_RDONLY | O_CLOEXEC);
if (fd != -1)
{
ElfW(Ehdr) *ehdr;
/* We successfully openened the file. Now verify it is a file
we can use. */
__set_errno (0);
- fbp->len = __libc_read (fd, fbp->buf, sizeof (fbp->buf));
+ fbp->len = 0;
+ assert (sizeof (fbp->buf) > sizeof (ElfW(Ehdr)));
+ /* Read in the header. */
+ do
+ {
+ ssize_t retlen = __libc_read (fd, fbp->buf + fbp->len,
+ sizeof (fbp->buf) - fbp->len);
+ if (retlen <= 0)
+ break;
+ fbp->len += retlen;
+ }
+ while (__builtin_expect (fbp->len < sizeof (ElfW(Ehdr)), 0));
/* This is where the ELF header is loaded. */
- assert (sizeof (fbp->buf) > sizeof (ElfW(Ehdr)));
ehdr = (ElfW(Ehdr) *) fbp->buf;
/* Now run the tests. */
name = strdupa (realname);
free (realname);
}
- lose (errval, fd, name, NULL, NULL, errstring, NULL);
+ lose (errval, fd, name, NULL, NULL, errstring, NULL, 0);
}
/* See whether the ELF header is what we expect. */
_dl_debug_printf ((mode & __RTLD_CALLMAP) == 0
? "\nfile=%s [%lu]; needed by %s [%lu]\n"
: "\nfile=%s [%lu]; dynamically loaded by %s [%lu]\n",
- name, nsid, loader->l_name[0]
- ? loader->l_name : rtld_progname, loader->l_ns);
+ name, nsid, DSO_FILENAME (loader->l_name), loader->l_ns);
#ifdef SHARED
/* Give the auditing libraries a chance to change the name before we
&loader->l_runpath_dirs, &realname, &fb, loader,
LA_SER_RUNPATH, &found_other_class);
+#ifdef USE_LDCONFIG
if (fd == -1
&& (__builtin_expect (! (mode & __RTLD_SECURE), 1)
- || ! INTUSE(__libc_enable_secure)))
+ || ! INTUSE(__libc_enable_secure))
+ && __builtin_expect (GLRO(dl_inhibit_cache) == 0, 1))
{
/* Check the list of libraries in the file /etc/ld.so.cache,
for compatibility with Linux's ldconfig program. */
if (cached != NULL)
{
-#ifdef SHARED
+# ifdef SHARED
// XXX Correct to unconditionally default to namespace 0?
l = (loader
?: GL(dl_ns)[LM_ID_BASE]._ns_loaded
?: &GL(dl_rtld_map));
-#else
+# else
l = loader;
-#endif
+# endif
/* If the loader has the DF_1_NODEFLIB flag set we must not
use a cache entry from any of these directories. */
if (
-#ifndef SHARED
+# ifndef SHARED
/* 'l' is always != NULL for dynamically linked objects. */
l != NULL &&
-#endif
+# endif
__builtin_expect (l->l_flags_1 & DF_1_NODEFLIB, 0))
{
const char *dirp = system_dirs;
}
}
}
+#endif
/* Finally, try the default path. */
if (fd == -1
projects / thirdparty / glibc.git / blobdiff