7f7489eba3
and resolve naming conficts Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29623
297 lines
6.5 KiB
C
297 lines
6.5 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 1998 John D. Polstra
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#if !defined(IN_LIBDL) || defined(PIC)
|
|
|
|
/*
|
|
* Linkage to services provided by the dynamic linker.
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <machine/atomic.h>
|
|
#include <dlfcn.h>
|
|
#include <link.h>
|
|
#include <stddef.h>
|
|
#include "namespace.h"
|
|
#include <pthread.h>
|
|
#include "un-namespace.h"
|
|
#include "rtld.h"
|
|
#include "libc_private.h"
|
|
#include "reentrant.h"
|
|
|
|
static const char sorry[] = "Service unavailable";
|
|
|
|
void _rtld_thread_init(void *);
|
|
void _rtld_atfork_pre(int *);
|
|
void _rtld_atfork_post(int *);
|
|
|
|
/*
|
|
* For ELF, the dynamic linker directly resolves references to its
|
|
* services to functions inside the dynamic linker itself. These
|
|
* weak-symbol stubs are necessary so that "ld" won't complain about
|
|
* undefined symbols. The stubs are executed only when the program is
|
|
* linked statically, or when a given service isn't implemented in the
|
|
* dynamic linker. They must return an error if called, and they must
|
|
* be weak symbols so that the dynamic linker can override them.
|
|
*/
|
|
|
|
#pragma weak _rtld_error
|
|
void
|
|
_rtld_error(const char *fmt __unused, ...)
|
|
{
|
|
}
|
|
|
|
#pragma weak dladdr
|
|
int
|
|
dladdr(const void *addr __unused, Dl_info *dlip __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (0);
|
|
}
|
|
|
|
#pragma weak dlclose
|
|
int
|
|
dlclose(void *handle __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (-1);
|
|
}
|
|
|
|
#pragma weak dlerror
|
|
char *
|
|
dlerror(void)
|
|
{
|
|
|
|
return (__DECONST(char *, sorry));
|
|
}
|
|
|
|
#pragma weak dllockinit
|
|
void
|
|
dllockinit(void *context,
|
|
void *(*lock_create)(void *context) __unused,
|
|
void (*rlock_acquire)(void *lock) __unused,
|
|
void (*wlock_acquire)(void *lock) __unused,
|
|
void (*lock_release)(void *lock) __unused,
|
|
void (*lock_destroy)(void *lock) __unused,
|
|
void (*context_destroy)(void *context) __unused)
|
|
{
|
|
|
|
if (context_destroy != NULL)
|
|
context_destroy(context);
|
|
}
|
|
|
|
#pragma weak dlopen
|
|
void *
|
|
dlopen(const char *name __unused, int mode __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (NULL);
|
|
}
|
|
|
|
#pragma weak dlsym
|
|
void *
|
|
dlsym(void * __restrict handle __unused, const char * __restrict name __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (NULL);
|
|
}
|
|
|
|
#pragma weak dlfunc
|
|
dlfunc_t
|
|
dlfunc(void * __restrict handle __unused, const char * __restrict name __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (NULL);
|
|
}
|
|
|
|
#pragma weak dlvsym
|
|
void *
|
|
dlvsym(void * __restrict handle __unused, const char * __restrict name __unused,
|
|
const char * __restrict version __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (NULL);
|
|
}
|
|
|
|
#pragma weak dlinfo
|
|
int
|
|
dlinfo(void * __restrict handle __unused, int request __unused,
|
|
void * __restrict p __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (0);
|
|
}
|
|
|
|
#pragma weak _rtld_thread_init
|
|
void
|
|
_rtld_thread_init(void *li __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
}
|
|
|
|
#ifndef IN_LIBDL
|
|
static pthread_once_t dl_phdr_info_once = PTHREAD_ONCE_INIT;
|
|
static struct dl_phdr_info phdr_info;
|
|
static mutex_t dl_phdr_info_lock = MUTEX_INITIALIZER;
|
|
|
|
static void
|
|
dl_init_phdr_info(void)
|
|
{
|
|
Elf_Auxinfo *auxp;
|
|
unsigned int i;
|
|
|
|
for (auxp = __elf_aux_vector; auxp->a_type != AT_NULL; auxp++) {
|
|
switch (auxp->a_type) {
|
|
case AT_BASE:
|
|
phdr_info.dlpi_addr = (Elf_Addr)auxp->a_un.a_ptr;
|
|
break;
|
|
case AT_EXECPATH:
|
|
phdr_info.dlpi_name = (const char *)auxp->a_un.a_ptr;
|
|
break;
|
|
case AT_PHDR:
|
|
phdr_info.dlpi_phdr =
|
|
(const Elf_Phdr *)auxp->a_un.a_ptr;
|
|
break;
|
|
case AT_PHNUM:
|
|
phdr_info.dlpi_phnum = (Elf_Half)auxp->a_un.a_val;
|
|
break;
|
|
}
|
|
}
|
|
for (i = 0; i < phdr_info.dlpi_phnum; i++) {
|
|
if (phdr_info.dlpi_phdr[i].p_type == PT_TLS) {
|
|
phdr_info.dlpi_tls_modid = 1;
|
|
phdr_info.dlpi_tls_data =
|
|
(void*)phdr_info.dlpi_phdr[i].p_vaddr;
|
|
}
|
|
}
|
|
phdr_info.dlpi_adds = 1;
|
|
}
|
|
#endif
|
|
|
|
#pragma weak dl_iterate_phdr
|
|
int
|
|
dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *) __unused,
|
|
void *data __unused)
|
|
{
|
|
#ifndef IN_LIBDL
|
|
int ret;
|
|
|
|
__init_elf_aux_vector();
|
|
if (__elf_aux_vector == NULL)
|
|
return (1);
|
|
_once(&dl_phdr_info_once, dl_init_phdr_info);
|
|
mutex_lock(&dl_phdr_info_lock);
|
|
ret = callback(&phdr_info, sizeof(phdr_info), data);
|
|
mutex_unlock(&dl_phdr_info_lock);
|
|
return (ret);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
#pragma weak fdlopen
|
|
void *
|
|
fdlopen(int fd __unused, int mode __unused)
|
|
{
|
|
|
|
_rtld_error(sorry);
|
|
return (NULL);
|
|
}
|
|
|
|
#pragma weak _rtld_atfork_pre
|
|
void
|
|
_rtld_atfork_pre(int *locks __unused)
|
|
{
|
|
}
|
|
|
|
#pragma weak _rtld_atfork_post
|
|
void
|
|
_rtld_atfork_post(int *locks __unused)
|
|
{
|
|
}
|
|
|
|
#pragma weak _rtld_addr_phdr
|
|
int
|
|
_rtld_addr_phdr(const void *addr __unused,
|
|
struct dl_phdr_info *phdr_info_a __unused)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
#pragma weak _rtld_get_stack_prot
|
|
int
|
|
_rtld_get_stack_prot(void)
|
|
{
|
|
#ifndef IN_LIBDL
|
|
unsigned i;
|
|
int r;
|
|
static int ret;
|
|
|
|
r = atomic_load_int(&ret);
|
|
if (r != 0)
|
|
return (r);
|
|
|
|
_once(&dl_phdr_info_once, dl_init_phdr_info);
|
|
r = PROT_EXEC | PROT_READ | PROT_WRITE;
|
|
for (i = 0; i < phdr_info.dlpi_phnum; i++) {
|
|
if (phdr_info.dlpi_phdr[i].p_type != PT_GNU_STACK)
|
|
continue;
|
|
r = PROT_READ | PROT_WRITE;
|
|
if ((phdr_info.dlpi_phdr[i].p_flags & PF_X) != 0)
|
|
r |= PROT_EXEC;
|
|
break;
|
|
}
|
|
atomic_store_int(&ret, r);
|
|
return (r);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
#pragma weak _rtld_is_dlopened
|
|
int
|
|
_rtld_is_dlopened(void *arg __unused)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
#endif /* !defined(IN_LIBDL) || defined(PIC) */
|