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/* Relocate a shared object and resolve its references to other loaded 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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6c4009 |
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The GNU C Library is free software; you can redistribute it and/or
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6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
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6c4009 |
License as published by the Free Software Foundation; either
|
|
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6c4009 |
version 2.1 of the License, or (at your option) any later version.
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6c4009 |
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6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
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6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
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6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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6c4009 |
You should have received a copy of the GNU Lesser General Public
|
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6c4009 |
License along with the GNU C Library; if not, see
|
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6c4009 |
<http://www.gnu.org/licenses/>. */
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6c4009 |
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6c4009 |
#include <errno.h>
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6c4009 |
#include <libintl.h>
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6c4009 |
#include <stdlib.h>
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6c4009 |
#include <unistd.h>
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6c4009 |
#include <ldsodefs.h>
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#include <sys/mman.h>
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6c4009 |
#include <sys/param.h>
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6c4009 |
#include <sys/types.h>
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6c4009 |
#include <_itoa.h>
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6c4009 |
#include <libc-pointer-arith.h>
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6c4009 |
#include "dynamic-link.h"
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6c4009 |
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6c4009 |
/* Statistics function. */
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6c4009 |
#ifdef SHARED
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6c4009 |
# define bump_num_cache_relocations() ++GL(dl_num_cache_relocations)
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6c4009 |
#else
|
|
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6c4009 |
# define bump_num_cache_relocations() ((void) 0)
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6c4009 |
#endif
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6c4009 |
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6c4009 |
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6c4009 |
/* We are trying to perform a static TLS relocation in MAP, but it was
|
|
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6c4009 |
dynamically loaded. This can only work if there is enough surplus in
|
|
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6c4009 |
the static TLS area already allocated for each running thread. If this
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Packit Service |
8bbac7 |
object's TLS segment is too big to fit, we fail. If it fits,
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8bbac7 |
we set MAP->l_tls_offset and return.
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8bbac7 |
This function intentionally does not return any value but signals error
|
|
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8bbac7 |
directly, as static TLS should be rare and code handling it should
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8bbac7 |
not be inlined as much as possible. */
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|
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6c4009 |
int
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8bbac7 |
_dl_try_allocate_static_tls (struct link_map *map)
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6c4009 |
{
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|
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6c4009 |
/* If we've already used the variable with dynamic access, or if the
|
|
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6c4009 |
alignment requirements are too high, fail. */
|
|
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6c4009 |
if (map->l_tls_offset == FORCED_DYNAMIC_TLS_OFFSET
|
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6c4009 |
|| map->l_tls_align > GL(dl_tls_static_align))
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6c4009 |
{
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|
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6c4009 |
fail:
|
|
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6c4009 |
return -1;
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|
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6c4009 |
}
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6c4009 |
|
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6c4009 |
#if TLS_TCB_AT_TP
|
|
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size_t freebytes = GL(dl_tls_static_size) - GL(dl_tls_static_used);
|
|
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6c4009 |
if (freebytes < TLS_TCB_SIZE)
|
|
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6c4009 |
goto fail;
|
|
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6c4009 |
freebytes -= TLS_TCB_SIZE;
|
|
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6c4009 |
|
|
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6c4009 |
size_t blsize = map->l_tls_blocksize + map->l_tls_firstbyte_offset;
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6c4009 |
if (freebytes < blsize)
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6c4009 |
goto fail;
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|
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6c4009 |
|
|
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6c4009 |
size_t n = (freebytes - blsize) / map->l_tls_align;
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6c4009 |
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|
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8bbac7 |
size_t offset = GL(dl_tls_static_used) + (freebytes - n * map->l_tls_align
|
|
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8bbac7 |
- map->l_tls_firstbyte_offset);
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|
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6c4009 |
|
|
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6c4009 |
map->l_tls_offset = GL(dl_tls_static_used) = offset;
|
|
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6c4009 |
#elif TLS_DTV_AT_TP
|
|
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6c4009 |
/* dl_tls_static_used includes the TCB at the beginning. */
|
|
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6c4009 |
size_t offset = (ALIGN_UP(GL(dl_tls_static_used)
|
|
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6c4009 |
- map->l_tls_firstbyte_offset,
|
|
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6c4009 |
map->l_tls_align)
|
|
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6c4009 |
+ map->l_tls_firstbyte_offset);
|
|
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6c4009 |
size_t used = offset + map->l_tls_blocksize;
|
|
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6c4009 |
|
|
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6c4009 |
if (used > GL(dl_tls_static_size))
|
|
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6c4009 |
goto fail;
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|
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6c4009 |
|
|
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6c4009 |
map->l_tls_offset = offset;
|
|
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6c4009 |
map->l_tls_firstbyte_offset = GL(dl_tls_static_used);
|
|
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6c4009 |
GL(dl_tls_static_used) = used;
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|
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6c4009 |
#else
|
|
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6c4009 |
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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6c4009 |
#endif
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6c4009 |
|
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6c4009 |
/* If the object is not yet relocated we cannot initialize the
|
|
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6c4009 |
static TLS region. Delay it. */
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|
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6c4009 |
if (map->l_real->l_relocated)
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6c4009 |
{
|
|
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6c4009 |
#ifdef SHARED
|
|
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6c4009 |
if (__builtin_expect (THREAD_DTV()[0].counter != GL(dl_tls_generation),
|
|
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6c4009 |
0))
|
|
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6c4009 |
/* Update the slot information data for at least the generation of
|
|
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6c4009 |
the DSO we are allocating data for. */
|
|
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6c4009 |
(void) _dl_update_slotinfo (map->l_tls_modid);
|
|
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6c4009 |
#endif
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|
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6c4009 |
|
|
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6c4009 |
GL(dl_init_static_tls) (map);
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|
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6c4009 |
}
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|
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6c4009 |
else
|
|
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6c4009 |
map->l_need_tls_init = 1;
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|
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6c4009 |
|
|
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6c4009 |
return 0;
|
|
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6c4009 |
}
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6c4009 |
|
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6c4009 |
void
|
|
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6c4009 |
__attribute_noinline__
|
|
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6c4009 |
_dl_allocate_static_tls (struct link_map *map)
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|
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6c4009 |
{
|
|
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6c4009 |
if (map->l_tls_offset == FORCED_DYNAMIC_TLS_OFFSET
|
|
Packit Service |
8bbac7 |
|| _dl_try_allocate_static_tls (map))
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|
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6c4009 |
{
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|
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6c4009 |
_dl_signal_error (0, map->l_name, NULL, N_("\
|
|
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6c4009 |
cannot allocate memory in static TLS block"));
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|
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6c4009 |
}
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|
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6c4009 |
}
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6c4009 |
|
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6c4009 |
/* Initialize static TLS area and DTV for current (only) thread.
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6c4009 |
libpthread implementations should provide their own hook
|
|
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6c4009 |
to handle all threads. */
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6c4009 |
void
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6c4009 |
_dl_nothread_init_static_tls (struct link_map *map)
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6c4009 |
{
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|
Packit |
6c4009 |
#if TLS_TCB_AT_TP
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|
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6c4009 |
void *dest = (char *) THREAD_SELF - map->l_tls_offset;
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6c4009 |
#elif TLS_DTV_AT_TP
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|
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6c4009 |
void *dest = (char *) THREAD_SELF + map->l_tls_offset + TLS_PRE_TCB_SIZE;
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|
Packit |
6c4009 |
#else
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Packit |
6c4009 |
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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|
Packit |
6c4009 |
#endif
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Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Initialize the memory. */
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|
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6c4009 |
memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
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|
Packit |
6c4009 |
'\0', map->l_tls_blocksize - map->l_tls_initimage_size);
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|
Packit |
6c4009 |
}
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6c4009 |
|
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6c4009 |
|
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Packit |
6c4009 |
void
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6c4009 |
_dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
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Packit |
6c4009 |
int reloc_mode, int consider_profiling)
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|
Packit |
6c4009 |
{
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|
Packit |
6c4009 |
struct textrels
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|
Packit |
6c4009 |
{
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|
Packit |
6c4009 |
caddr_t start;
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|
Packit |
6c4009 |
size_t len;
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|
Packit |
6c4009 |
int prot;
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|
Packit |
6c4009 |
struct textrels *next;
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|
Packit |
6c4009 |
} *textrels = NULL;
|
|
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6c4009 |
/* Initialize it to make the compiler happy. */
|
|
Packit |
6c4009 |
const char *errstring = NULL;
|
|
Packit |
6c4009 |
int lazy = reloc_mode & RTLD_LAZY;
|
|
Packit |
6c4009 |
int skip_ifunc = reloc_mode & __RTLD_NOIFUNC;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifdef SHARED
|
|
Packit |
6c4009 |
/* If we are auditing, install the same handlers we need for profiling. */
|
|
Packit |
6c4009 |
if ((reloc_mode & __RTLD_AUDIT) == 0)
|
|
Packit |
6c4009 |
consider_profiling |= GLRO(dl_audit) != NULL;
|
|
Packit |
6c4009 |
#elif defined PROF
|
|
Packit |
6c4009 |
/* Never use dynamic linker profiling for gprof profiling code. */
|
|
Packit |
6c4009 |
# define consider_profiling 0
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (l->l_relocated)
|
|
Packit |
6c4009 |
return;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* If DT_BIND_NOW is set relocate all references in this object. We
|
|
Packit |
6c4009 |
do not do this if we are profiling, of course. */
|
|
Packit |
6c4009 |
// XXX Correct for auditing?
|
|
Packit |
6c4009 |
if (!consider_profiling
|
|
Packit |
6c4009 |
&& __builtin_expect (l->l_info[DT_BIND_NOW] != NULL, 0))
|
|
Packit |
6c4009 |
lazy = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_RELOC))
|
|
Packit |
6c4009 |
_dl_debug_printf ("\nrelocation processing: %s%s\n",
|
|
Packit |
6c4009 |
DSO_FILENAME (l->l_name), lazy ? " (lazy)" : "");
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* DT_TEXTREL is now in level 2 and might phase out at some time.
|
|
Packit |
6c4009 |
But we rewrite the DT_FLAGS entry to a DT_TEXTREL entry to make
|
|
Packit |
6c4009 |
testing easier and therefore it will be available at all time. */
|
|
Packit |
6c4009 |
if (__glibc_unlikely (l->l_info[DT_TEXTREL] != NULL))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Bletch. We must make read-only segments writable
|
|
Packit |
6c4009 |
long enough to relocate them. */
|
|
Packit |
6c4009 |
const ElfW(Phdr) *ph;
|
|
Packit |
6c4009 |
for (ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
|
|
Packit |
6c4009 |
if (ph->p_type == PT_LOAD && (ph->p_flags & PF_W) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct textrels *newp;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
newp = (struct textrels *) alloca (sizeof (*newp));
|
|
Packit |
6c4009 |
newp->len = ALIGN_UP (ph->p_vaddr + ph->p_memsz, GLRO(dl_pagesize))
|
|
Packit |
6c4009 |
- ALIGN_DOWN (ph->p_vaddr, GLRO(dl_pagesize));
|
|
Packit |
6c4009 |
newp->start = PTR_ALIGN_DOWN (ph->p_vaddr, GLRO(dl_pagesize))
|
|
Packit |
6c4009 |
+ (caddr_t) l->l_addr;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__mprotect (newp->start, newp->len, PROT_READ|PROT_WRITE) < 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
errstring = N_("cannot make segment writable for relocation");
|
|
Packit |
6c4009 |
call_error:
|
|
Packit |
6c4009 |
_dl_signal_error (errno, l->l_name, NULL, errstring);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7
|
|
Packit |
6c4009 |
newp->prot = (PF_TO_PROT
|
|
Packit |
6c4009 |
>> ((ph->p_flags & (PF_R | PF_W | PF_X)) * 4)) & 0xf;
|
|
Packit |
6c4009 |
#else
|
|
Packit |
6c4009 |
newp->prot = 0;
|
|
Packit |
6c4009 |
if (ph->p_flags & PF_R)
|
|
Packit |
6c4009 |
newp->prot |= PROT_READ;
|
|
Packit |
6c4009 |
if (ph->p_flags & PF_W)
|
|
Packit |
6c4009 |
newp->prot |= PROT_WRITE;
|
|
Packit |
6c4009 |
if (ph->p_flags & PF_X)
|
|
Packit |
6c4009 |
newp->prot |= PROT_EXEC;
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
newp->next = textrels;
|
|
Packit |
6c4009 |
textrels = newp;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Do the actual relocation of the object's GOT and other data. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* String table object symbols. */
|
|
Packit |
6c4009 |
const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
|
|
Packit |
6c4009 |
#define RESOLVE_MAP(ref, version, r_type) \
|
|
Packit |
6c4009 |
((ELFW(ST_BIND) ((*ref)->st_info) != STB_LOCAL \
|
|
Packit |
6c4009 |
&& __glibc_likely (!dl_symbol_visibility_binds_local_p (*ref))) \
|
|
Packit |
6c4009 |
? ((__builtin_expect ((*ref) == l->l_lookup_cache.sym, 0) \
|
|
Packit |
6c4009 |
&& elf_machine_type_class (r_type) == l->l_lookup_cache.type_class) \
|
|
Packit |
6c4009 |
? (bump_num_cache_relocations (), \
|
|
Packit |
6c4009 |
(*ref) = l->l_lookup_cache.ret, \
|
|
Packit |
6c4009 |
l->l_lookup_cache.value) \
|
|
Packit |
6c4009 |
: ({ lookup_t _lr; \
|
|
Packit |
6c4009 |
int _tc = elf_machine_type_class (r_type); \
|
|
Packit |
6c4009 |
l->l_lookup_cache.type_class = _tc; \
|
|
Packit |
6c4009 |
l->l_lookup_cache.sym = (*ref); \
|
|
Packit |
6c4009 |
const struct r_found_version *v = NULL; \
|
|
Packit |
6c4009 |
if ((version) != NULL && (version)->hash != 0) \
|
|
Packit |
6c4009 |
v = (version); \
|
|
Packit |
6c4009 |
_lr = _dl_lookup_symbol_x (strtab + (*ref)->st_name, l, (ref), \
|
|
Packit |
6c4009 |
scope, v, _tc, \
|
|
Packit Service |
1bb1a5 |
DL_LOOKUP_ADD_DEPENDENCY \
|
|
Packit Service |
1bb1a5 |
| DL_LOOKUP_FOR_RELOCATE, NULL); \
|
|
Packit |
6c4009 |
l->l_lookup_cache.ret = (*ref); \
|
|
Packit |
6c4009 |
l->l_lookup_cache.value = _lr; })) \
|
|
Packit |
6c4009 |
: l)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include "dynamic-link.h"
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
ELF_DYNAMIC_RELOCATE (l, lazy, consider_profiling, skip_ifunc);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifndef PROF
|
|
Packit |
6c4009 |
if (__glibc_unlikely (consider_profiling)
|
|
Packit |
6c4009 |
&& l->l_info[DT_PLTRELSZ] != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Allocate the array which will contain the already found
|
|
Packit |
6c4009 |
relocations. If the shared object lacks a PLT (for example
|
|
Packit |
6c4009 |
if it only contains lead function) the l_info[DT_PLTRELSZ]
|
|
Packit |
6c4009 |
will be NULL. */
|
|
Packit |
6c4009 |
size_t sizeofrel = l->l_info[DT_PLTREL]->d_un.d_val == DT_RELA
|
|
Packit |
6c4009 |
? sizeof (ElfW(Rela))
|
|
Packit |
6c4009 |
: sizeof (ElfW(Rel));
|
|
Packit |
6c4009 |
size_t relcount = l->l_info[DT_PLTRELSZ]->d_un.d_val / sizeofrel;
|
|
Packit |
6c4009 |
l->l_reloc_result = calloc (sizeof (l->l_reloc_result[0]), relcount);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (l->l_reloc_result == NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
errstring = N_("\
|
|
Packit |
6c4009 |
%s: out of memory to store relocation results for %s\n");
|
|
Packit |
6c4009 |
_dl_fatal_printf (errstring, RTLD_PROGNAME, l->l_name);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Mark the object so we know this work has been done. */
|
|
Packit |
6c4009 |
l->l_relocated = 1;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Undo the segment protection changes. */
|
|
Packit |
6c4009 |
while (__builtin_expect (textrels != NULL, 0))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (__mprotect (textrels->start, textrels->len, textrels->prot) < 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
errstring = N_("cannot restore segment prot after reloc");
|
|
Packit |
6c4009 |
goto call_error;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifdef CLEAR_CACHE
|
|
Packit |
6c4009 |
CLEAR_CACHE (textrels->start, textrels->start + textrels->len);
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
textrels = textrels->next;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* In case we can protect the data now that the relocations are
|
|
Packit |
6c4009 |
done, do it. */
|
|
Packit |
6c4009 |
if (l->l_relro_size != 0)
|
|
Packit |
6c4009 |
_dl_protect_relro (l);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void
|
|
Packit |
6c4009 |
_dl_protect_relro (struct link_map *l)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Addr) start = ALIGN_DOWN((l->l_addr
|
|
Packit |
6c4009 |
+ l->l_relro_addr),
|
|
Packit |
6c4009 |
GLRO(dl_pagesize));
|
|
Packit |
6c4009 |
ElfW(Addr) end = ALIGN_DOWN((l->l_addr
|
|
Packit |
6c4009 |
+ l->l_relro_addr
|
|
Packit |
6c4009 |
+ l->l_relro_size),
|
|
Packit |
6c4009 |
GLRO(dl_pagesize));
|
|
Packit |
6c4009 |
if (start != end
|
|
Packit |
6c4009 |
&& __mprotect ((void *) start, end - start, PROT_READ) < 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
static const char errstring[] = N_("\
|
|
Packit |
6c4009 |
cannot apply additional memory protection after relocation");
|
|
Packit |
6c4009 |
_dl_signal_error (errno, l->l_name, NULL, errstring);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void
|
|
Packit |
6c4009 |
__attribute_noinline__
|
|
Packit |
6c4009 |
_dl_reloc_bad_type (struct link_map *map, unsigned int type, int plt)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
#define DIGIT(b) _itoa_lower_digits[(b) & 0xf];
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* XXX We cannot translate these messages. */
|
|
Packit |
6c4009 |
static const char msg[2][32
|
|
Packit |
6c4009 |
#if __ELF_NATIVE_CLASS == 64
|
|
Packit |
6c4009 |
+ 6
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
] = { "unexpected reloc type 0x",
|
|
Packit |
6c4009 |
"unexpected PLT reloc type 0x" };
|
|
Packit |
6c4009 |
char msgbuf[sizeof (msg[0])];
|
|
Packit |
6c4009 |
char *cp;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
cp = __stpcpy (msgbuf, msg[plt]);
|
|
Packit |
6c4009 |
#if __ELF_NATIVE_CLASS == 64
|
|
Packit |
6c4009 |
if (__builtin_expect(type > 0xff, 0))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 28);
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 24);
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 20);
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 16);
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 12);
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 8);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type >> 4);
|
|
Packit |
6c4009 |
*cp++ = DIGIT (type);
|
|
Packit |
6c4009 |
*cp = '\0';
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
_dl_signal_error (0, map->l_name, NULL, msgbuf);
|
|
Packit |
6c4009 |
}
|