173 lines
5.8 KiB
C
173 lines
5.8 KiB
C
/* Relocate a shared object and resolve its references to other loaded objects.
|
|
Copyright (C) 1995,96,97,98,99,2000 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
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <ldsodefs.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/types.h>
|
|
#include "dynamic-link.h"
|
|
|
|
|
|
void
|
|
_dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
|
|
int lazy, int consider_profiling)
|
|
{
|
|
if (l->l_relocated)
|
|
return;
|
|
|
|
/* If DT_BIND_NOW is set relocate all references in this object. We
|
|
do not do this if we are profiling, of course. */
|
|
if (!consider_profiling && l->l_info[DT_BIND_NOW])
|
|
lazy = 0;
|
|
|
|
if (__builtin_expect (_dl_debug_reloc, 0))
|
|
_dl_debug_message (1, "\nrelocation processing: ",
|
|
l->l_name[0] ? l->l_name : _dl_argv[0],
|
|
lazy ? " (lazy)\n" : "\n", NULL);
|
|
|
|
if (__builtin_expect (l->l_info[DT_TEXTREL] != NULL, 0))
|
|
{
|
|
/* Bletch. We must make read-only segments writable
|
|
long enough to relocate them. */
|
|
const ElfW(Phdr) *ph;
|
|
for (ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
|
|
if (ph->p_type == PT_LOAD && (ph->p_flags & PF_W) == 0)
|
|
{
|
|
caddr_t mapstart = ((caddr_t) l->l_addr +
|
|
(ph->p_vaddr & ~(_dl_pagesize - 1)));
|
|
caddr_t mapend = ((caddr_t) l->l_addr +
|
|
((ph->p_vaddr + ph->p_memsz + _dl_pagesize - 1)
|
|
& ~(_dl_pagesize - 1)));
|
|
if (__mprotect (mapstart, mapend - mapstart,
|
|
PROT_READ|PROT_WRITE) < 0)
|
|
_dl_signal_error (errno, l->l_name,
|
|
"cannot make segment writable for relocation");
|
|
}
|
|
}
|
|
|
|
{
|
|
/* Do the actual relocation of the object's GOT and other data. */
|
|
|
|
/* String table object symbols. */
|
|
const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]);
|
|
|
|
/* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
|
|
#define RESOLVE_MAP(ref, version, flags) \
|
|
(ELFW(ST_BIND) ((*ref)->st_info) != STB_LOCAL \
|
|
? ((version) != NULL && (version)->hash != 0 \
|
|
? _dl_lookup_versioned_symbol (strtab + (*ref)->st_name, l, (ref), \
|
|
scope, (version), (flags)) \
|
|
: _dl_lookup_symbol (strtab + (*ref)->st_name, l, (ref), scope, \
|
|
(flags))) \
|
|
: l)
|
|
#define RESOLVE(ref, version, flags) \
|
|
(__builtin_expect (ELFW(ST_VISIBILITY) ((*ref)->st_other), 0) == 0 \
|
|
? ((version) != NULL && (version)->hash != 0 \
|
|
? _dl_lookup_versioned_symbol (strtab + (*ref)->st_name, l, (ref), \
|
|
scope, (version), (flags)) \
|
|
: _dl_lookup_symbol (strtab + (*ref)->st_name, l, (ref), scope, \
|
|
(flags))) \
|
|
: l->l_addr)
|
|
|
|
#include "dynamic-link.h"
|
|
ELF_DYNAMIC_RELOCATE (l, lazy, consider_profiling);
|
|
|
|
if (__builtin_expect (_dl_profile != NULL, 0))
|
|
{
|
|
/* Allocate the array which will contain the already found
|
|
relocations. */
|
|
l->l_reloc_result =
|
|
(ElfW(Addr) *) calloc (sizeof (ElfW(Addr)),
|
|
l->l_info[DT_PLTRELSZ]->d_un.d_val);
|
|
if (l->l_reloc_result == NULL)
|
|
_dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
|
|
"cannot allocate memory for profiling", NULL);
|
|
}
|
|
}
|
|
|
|
/* Mark the object so we know this work has been done. */
|
|
l->l_relocated = 1;
|
|
|
|
/* DT_TEXTREL is now in level 2 and might phase out at some time.
|
|
But we rewrite the DT_FLAGS entry to make testing easier and
|
|
therefore it will be available at all time. */
|
|
if (__builtin_expect (l->l_info[DT_TEXTREL] != NULL, 0))
|
|
{
|
|
/* Undo the protection change we made before relocating. */
|
|
const ElfW(Phdr) *ph;
|
|
for (ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
|
|
if (ph->p_type == PT_LOAD && (ph->p_flags & PF_W) == 0)
|
|
{
|
|
caddr_t mapstart = ((caddr_t) l->l_addr +
|
|
(ph->p_vaddr & ~(_dl_pagesize - 1)));
|
|
caddr_t mapend = ((caddr_t) l->l_addr +
|
|
((ph->p_vaddr + ph->p_memsz + _dl_pagesize - 1)
|
|
& ~(_dl_pagesize - 1)));
|
|
extern unsigned char _dl_pf_to_prot[8];
|
|
int prot;
|
|
|
|
if ((PF_R | PF_W | PF_X) == 7
|
|
&& (PROT_READ | PROT_WRITE | PROT_EXEC) == 7)
|
|
prot = _dl_pf_to_prot[ph->p_flags & (PF_R | PF_X)];
|
|
else
|
|
{
|
|
prot = 0;
|
|
if (ph->p_flags & PF_R)
|
|
prot |= PROT_READ;
|
|
if (ph->p_flags & PF_X)
|
|
prot |= PROT_EXEC;
|
|
}
|
|
|
|
if (__mprotect (mapstart, mapend - mapstart, prot) < 0)
|
|
_dl_signal_error (errno, l->l_name,
|
|
"can't restore segment prot after reloc");
|
|
|
|
#ifdef CLEAR_CACHE
|
|
CLEAR_CACHE (mapstart, mapend);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
#include "../stdio-common/_itoa.h"
|
|
#define DIGIT(b) _itoa_lower_digits[(b) & 0xf];
|
|
|
|
void
|
|
internal_function
|
|
_dl_reloc_bad_type (struct link_map *map, uint_fast8_t type, int plt)
|
|
{
|
|
extern const char _itoa_lower_digits[];
|
|
if (plt)
|
|
{
|
|
char msg[] = "unexpected reloc type 0x??";
|
|
msg[sizeof msg - 2] = DIGIT(type >> 8);
|
|
msg[sizeof msg - 1] = DIGIT(type);
|
|
_dl_signal_error (0, map->l_name, msg);
|
|
}
|
|
else
|
|
{
|
|
char msg[] = "unexpected PLT reloc type 0x??";
|
|
msg[sizeof msg - 2] = DIGIT(type >> 8);
|
|
msg[sizeof msg - 1] = DIGIT(type);
|
|
_dl_signal_error (0, map->l_name, msg);
|
|
}
|
|
}
|