glibc/elf/dl-reloc.c
Ulrich Drepper 06535ae948 Update.
* posix/unistd.h: Move declaration of __libc_enable_secure to...
	* include/unistd.h: ...here.

	* elf/dl-open.c (dl_open_worker): If DST is used in SUID program punt.
	* elf/dl-deps.c (expand_dst): Likewise.

	* elf/dynamic-link.h: Set DT_SYMBOLIC, DT_TEXTREL, and DT_BIND_NOW
	based on DT_FLAGS value.

	* elf/do-lookup.h: Remove reference_name parameter, add undef_map.
	Add test for symbols marked STV_HIDDEN.
	* elf/dl-lookup.c (_dl_lookup_symbol): Remove reference_name parameter,
	add undef_map.  Compute reference_name locally.  Update call to
	do_lookup.
	(_dl_lookup_symbol_skip): Likewise.
	(_dl_lookup_versioned_symbol): Likewise.
	(_dl_lookup_versioned_symbol_skip): Likewise.
	* elf/dl-libc.c: Update call to _dl_lookup_*symbol.
	* elf/dl-runtime.c: Likewise.
	* elf/dl-sym.c: Likewise.
	* elf/dl-symbol.c: Likewise.
	* elf/ldsodefs.h: Adjust prototypes.

	* elf/dl-reloc.c (RESOLV): Add test for STV_PROTECTED flag set and
	handle appropriately.  Add comment about DT_TEXTREL.
	* elf/dl-runtime.c: Likewise.
1999-07-23 22:58:50 +00:00

161 lines
5.3 KiB
C

/* Relocate a shared object and resolve its references to other loaded objects.
Copyright (C) 1995, 1996, 1997, 1998, 1999 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 <elf/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 (_dl_debug_reloc)
_dl_debug_message (1, "\nrelocation processing: ",
l->l_name[0] ? l->l_name : _dl_argv[0],
lazy ? " (lazy)\n" : "\n", NULL);
if (l->l_info[DT_TEXTREL])
{
/* 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 *) l->l_info[DT_STRTAB]->d_un.d_ptr;
/* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
#define RESOLVE(ref, version, flags) \
(ELFW(ST_VISIBILITY) ((*ref)->st_other) != STV_PROTECTED \
? ((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 (_dl_profile != NULL)
{
/* 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 (l->l_info[DT_TEXTREL])
{
/* 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");
}
}
}
#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);
}
}