2016-01-05 00:05:18 +08:00
|
|
|
/* Copyright (C) 1993-2016 Free Software Foundation, Inc.
|
2001-07-06 12:58:11 +08:00
|
|
|
This file is part of the GNU C Library.
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2001-07-06 12:58:11 +08:00
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
|
|
modify it under the terms of the GNU Lesser General Public
|
|
|
|
License as published by the Free Software Foundation; either
|
|
|
|
version 2.1 of the License, or (at your option) any later version.
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2001-07-06 12:58:11 +08:00
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
1997-12-15 06:24:57 +08:00
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
2001-07-06 12:58:11 +08:00
|
|
|
Lesser General Public License for more details.
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2001-07-06 12:58:11 +08:00
|
|
|
You should have received a copy of the GNU Lesser General Public
|
2012-02-10 07:18:22 +08:00
|
|
|
License along with the GNU C Library; if not, see
|
|
|
|
<http://www.gnu.org/licenses/>.
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2001-07-06 12:58:11 +08:00
|
|
|
As a special exception, if you link the code in this file with
|
|
|
|
files compiled with a GNU compiler to produce an executable,
|
|
|
|
that does not cause the resulting executable to be covered by
|
|
|
|
the GNU Lesser General Public License. This exception does not
|
|
|
|
however invalidate any other reasons why the executable file
|
|
|
|
might be covered by the GNU Lesser General Public License.
|
|
|
|
This exception applies to code released by its copyright holders
|
|
|
|
in files containing the exception. */
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2000-03-27 13:18:47 +08:00
|
|
|
#include <shlib-compat.h>
|
|
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
|
|
|
|
|
1997-12-15 06:24:57 +08:00
|
|
|
#define _IO_USE_OLD_IO_FILE
|
2012-01-31 05:20:32 +08:00
|
|
|
#include <stdlib.h>
|
1997-12-15 06:24:57 +08:00
|
|
|
#include "libioP.h"
|
|
|
|
#include <fcntl.h>
|
|
|
|
|
|
|
|
#ifndef _IO_fcntl
|
1998-12-17 21:58:32 +08:00
|
|
|
# define _IO_fcntl __fcntl
|
1997-12-15 06:24:57 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
_IO_FILE *
|
2004-03-10 17:29:17 +08:00
|
|
|
attribute_compat_text_section
|
2015-10-17 04:21:49 +08:00
|
|
|
_IO_old_fdopen (int fd, const char *mode)
|
1997-12-15 06:24:57 +08:00
|
|
|
{
|
|
|
|
int read_write;
|
|
|
|
int posix_mode = 0;
|
|
|
|
struct locked_FILE
|
|
|
|
{
|
2003-11-04 17:58:57 +08:00
|
|
|
struct _IO_FILE_complete_plus fp;
|
1997-12-15 06:24:57 +08:00
|
|
|
#ifdef _IO_MTSAFE_IO
|
|
|
|
_IO_lock_t lock;
|
|
|
|
#endif
|
|
|
|
} *new_f;
|
|
|
|
int fd_flags;
|
|
|
|
|
|
|
|
switch (*mode++)
|
|
|
|
{
|
|
|
|
case 'r':
|
|
|
|
read_write = _IO_NO_WRITES;
|
|
|
|
break;
|
|
|
|
case 'w':
|
|
|
|
read_write = _IO_NO_READS;
|
|
|
|
break;
|
|
|
|
case 'a':
|
|
|
|
posix_mode = O_APPEND;
|
|
|
|
read_write = _IO_NO_READS|_IO_IS_APPENDING;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
MAYBE_SET_EINVAL;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
|
|
|
|
read_write &= _IO_IS_APPENDING;
|
|
|
|
#ifdef F_GETFL
|
|
|
|
fd_flags = _IO_fcntl (fd, F_GETFL);
|
|
|
|
#ifndef O_ACCMODE
|
|
|
|
#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
|
|
|
|
#endif
|
|
|
|
if (fd_flags == -1
|
|
|
|
|| ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES))
|
|
|
|
|| ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS)))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
/* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b)
|
|
|
|
[System Application Program Interface (API) Amendment 1:
|
|
|
|
Realtime Extensions], Rationale B.8.3.3
|
|
|
|
Open a Stream on a File Descriptor says:
|
|
|
|
|
|
|
|
Although not explicitly required by POSIX.1, a good
|
|
|
|
implementation of append ("a") mode would cause the
|
|
|
|
O_APPEND flag to be set.
|
|
|
|
|
|
|
|
(Historical implementations [such as Solaris2] do a one-time
|
|
|
|
seek in fdopen.)
|
|
|
|
|
|
|
|
However, we do not turn O_APPEND off if the mode is "w" (even
|
|
|
|
though that would seem consistent) because that would be more
|
|
|
|
likely to break historical programs.
|
|
|
|
*/
|
|
|
|
if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND))
|
|
|
|
{
|
|
|
|
#ifdef F_SETFL
|
|
|
|
if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
|
|
|
|
#endif
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
|
|
|
|
if (new_f == NULL)
|
|
|
|
return NULL;
|
|
|
|
#ifdef _IO_MTSAFE_IO
|
2003-11-04 17:58:57 +08:00
|
|
|
new_f->fp.file._file._lock = &new_f->lock;
|
1997-12-15 06:24:57 +08:00
|
|
|
#endif
|
2003-11-04 17:58:57 +08:00
|
|
|
_IO_old_init (&new_f->fp.file._file, 0);
|
2015-05-18 19:58:54 +08:00
|
|
|
_IO_JUMPS_FILE_plus (&new_f->fp) = &_IO_old_file_jumps;
|
libio: Implement vtable verification [BZ #20191]
This commit puts all libio vtables in a dedicated, read-only ELF
section, so that they are consecutive in memory. Before any indirect
jump, the vtable pointer is checked against the section boundaries,
and the process is terminated if the vtable pointer does not fall into
the special ELF section.
To enable backwards compatibility, a special flag variable
(_IO_accept_foreign_vtables), protected by the pointer guard, avoids
process termination if libio stream object constructor functions have
been called earlier. Such constructor functions are called by the GCC
2.95 libstdc++ library, and this mechanism ensures compatibility with
old binaries. Existing callers inside glibc of these functions are
adjusted to call the original functions, not the wrappers which enable
vtable compatiblity.
The compatibility mechanism is used to enable passing FILE * objects
across a static dlopen boundary, too.
2016-06-24 02:01:40 +08:00
|
|
|
_IO_old_file_init_internal ((struct _IO_FILE_plus *) &new_f->fp);
|
1997-12-15 06:24:57 +08:00
|
|
|
#if !_IO_UNIFIED_JUMPTABLES
|
|
|
|
new_f->fp.vtable = NULL;
|
|
|
|
#endif
|
2003-11-04 17:58:57 +08:00
|
|
|
if (_IO_old_file_attach (&new_f->fp.file._file, fd) == NULL)
|
1997-12-15 06:24:57 +08:00
|
|
|
{
|
2012-05-23 19:33:15 +08:00
|
|
|
_IO_un_link ((struct _IO_FILE_plus *) &new_f->fp);
|
1997-12-15 06:24:57 +08:00
|
|
|
free (new_f);
|
|
|
|
return NULL;
|
|
|
|
}
|
2003-11-04 17:58:57 +08:00
|
|
|
new_f->fp.file._file._flags &= ~_IO_DELETE_DONT_CLOSE;
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2010-07-18 20:51:45 +08:00
|
|
|
_IO_mask_flags (&new_f->fp.file._file, read_write,
|
|
|
|
_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
|
1997-12-15 06:24:57 +08:00
|
|
|
|
2000-06-28 Greg McGary <greg@mcgary.org>
* libio/libio.h (struct _IO_cookie_file): Move struct type defintion out.
(_IO_FILE): Declare chain as (struct _IO_FILE_plus *).
* libio/libioP.h (struct _IO_cookie_file): Move struct type defintion in.
(_IO_JUMPS): Don't cast THIS--expect arg to be a (struct _IO_FILE_plus *).
(_IO_JUMPS_FUNC): Express in terms of _IO_JUMPS, and add cast to
THIS, since _IO_JUMPS no longer does it implicitly.
(_IO_file_init, _IO_old_file_init, _IO_new_file_init): Declare
arg type as (struct _IO_FILE_plus *).
(_IO_str_init_static, _IO_str_init_readonly): Declare 1st
arg as (_IO_strfile *).
* libio/strops.c (_IO_str_init_static, _IO_str_init_readonly):
Declare 1st arg as (_IO_strfile *).
* libio/fileops.c (_IO_new_file_init): Declare
arg type as (struct _IO_FILE_plus *).
* libio/oldfileops.c (_IO_old_file_init): Likewise.
* libio/genops.c (_IO_link_in, _IO_un_link): Likewise.
(_IO_flush_all, _IO_flush_all_linebuffered, _IO_unbuffer_write):
Declare iteration pointer as (struct _IO_FILE_plus *).
(_IO_iter_next, _IO_iter_file): _IO_ITER is now (struct _IO_FILE_plus *).
* libio/stdfiles.c (_IO_list_all): Declare as (struct _IO_FILE_plus *).
* libio/oldstdfiles.c (_IO_list_all): Likewise.
(_IO_check_libio): Set user-visible handles to (struct _IO_FILE_plus *).
* libio/stdio.c (stdin, stdout, stderr): Set user-visible handles
to (struct _IO_FILE_plus *).
* libio/iofdopen.c (_IO_new_fdopen): Pass FILE handle pointer
whose high bound includes vtable to all functions that will use
vtable. For streambufs, pass pointer whose bounds include struct
_IO_strfile.
* libio/wgenops.c (_IO_wdefault_finish): Likewise.
* libio/oldiofdopen.c (_IO_old_fdopen): Likewise.
* libio/iofopen.c (_IO_new_fopen): Likewise.
* libio/oldiofopen.c (_IO_old_fopen): Likewise.
* libio/iofopen64.c (_IO_fopen64): Likewise.
* libio/iopopen.c (_IO_new_popen): Likewise.
* libio/oldiopopen.c (_IO_old_popen): Likewise.
* libio/memstream.c (open_memstream): Likewise.
* libio/iovsscanf.c (_IO_vsscanf): Likewise.
* libio/iovsprintf.c (_IO_vsprintf): Likewise.
* libio/iovdprintf.c (_IO_vdprintf): Likewise.
* libio/iofopncook.c (_IO_cookie_init): Likewise.
* libio/obprintf.c (_IO_obstack_vprintf): Likewise.
* libio/vasprintf.c (_IO_vasprintf): Likewise.
* libio/vsnprintf.c (_IO_vsnprintf): Likewise.
* libio/stdfiles.c (_IO_stdout_, _IO_stderr_): Likewise.
* libio/oldstdfiles.c (_IO_stdout_, _IO_stderr_): Likewise.
* stdlib/strfmon.c (__strfmon_l): Likewise.
* stdio-common/vfprintf.c (buffered_vfprintf): Likewise.
(vfprintf): Qualify computed-goto targets as unbounded.
2000-06-28 Greg McGary <greg@mcgary.org>
* libio/libio.h (struct _IO_cookie_file): Move struct type defintion out.
(_IO_FILE): Declare chain as (struct _IO_FILE_plus *).
* libio/libioP.h (struct _IO_cookie_file): Move struct type defintion in.
(_IO_JUMPS): Don't cast THIS--expect arg to be a (struct _IO_FILE_plus *).
(_IO_JUMPS_FUNC): Express in terms of _IO_JUMPS, and add cast to
THIS, since _IO_JUMPS no longer does it implicitly.
(_IO_file_init, _IO_old_file_init, _IO_new_file_init): Declare
arg type as (struct _IO_FILE_plus *).
(_IO_str_init_static, _IO_str_init_readonly): Declare 1st
arg as (_IO_strfile *).
* libio/strops.c (_IO_str_init_static, _IO_str_init_readonly):
Declare 1st arg as (_IO_strfile *).
* libio/fileops.c (_IO_new_file_init): Declare
arg type as (struct _IO_FILE_plus *).
* libio/oldfileops.c (_IO_old_file_init): Likewise.
* libio/genops.c (_IO_link_in, _IO_un_link): Likewise.
(_IO_flush_all, _IO_flush_all_linebuffered, _IO_unbuffer_write):
Declare iteration pointer as (struct _IO_FILE_plus *).
(_IO_iter_next, _IO_iter_file): _IO_ITER is now (struct _IO_FILE_plus *).
* libio/stdfiles.c (_IO_list_all): Declare as (struct _IO_FILE_plus *).
* libio/oldstdfiles.c (_IO_list_all): Likewise.
(_IO_check_libio): Set user-visible handles to (struct _IO_FILE_plus *).
* libio/stdio.c (stdin, stdout, stderr): Set user-visible handles
to (struct _IO_FILE_plus *).
* libio/iofdopen.c (_IO_new_fdopen): Pass FILE handle pointer
whose high bound includes vtable to all functions that will use
vtable. For streambufs, pass pointer whose bounds include struct
_IO_strfile.
* libio/wgenops.c (_IO_wdefault_finish): Likewise.
* libio/oldiofdopen.c (_IO_old_fdopen): Likewise.
* libio/iofopen.c (_IO_new_fopen): Likewise.
* libio/oldiofopen.c (_IO_old_fopen): Likewise.
* libio/iofopen64.c (_IO_fopen64): Likewise.
* libio/iopopen.c (_IO_new_popen): Likewise.
* libio/oldiopopen.c (_IO_old_popen): Likewise.
* libio/memstream.c (open_memstream): Likewise.
* libio/iovsscanf.c (_IO_vsscanf): Likewise.
* libio/iovsprintf.c (_IO_vsprintf): Likewise.
* libio/iovdprintf.c (_IO_vdprintf): Likewise.
* libio/iofopncook.c (_IO_cookie_init): Likewise.
* libio/obprintf.c (_IO_obstack_vprintf): Likewise.
* libio/vasprintf.c (_IO_vasprintf): Likewise.
* libio/vsnprintf.c (_IO_vsnprintf): Likewise.
* libio/stdfiles.c (_IO_stdout_, _IO_stderr_): Likewise.
* libio/oldstdfiles.c (_IO_stdout_, _IO_stderr_): Likewise.
* stdlib/strfmon.c (__strfmon_l): Likewise.
* stdio-common/vfprintf.c (buffered_vfprintf): Likewise.
(vfprintf): Qualify computed-goto targets as unbounded.
2000-06-29 15:16:42 +08:00
|
|
|
return (_IO_FILE *) &new_f->fp;
|
1997-12-15 06:24:57 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
strong_alias (_IO_old_fdopen, __old_fdopen)
|
2000-03-27 13:18:47 +08:00
|
|
|
compat_symbol (libc, _IO_old_fdopen, _IO_fdopen, GLIBC_2_0);
|
|
|
|
compat_symbol (libc, __old_fdopen, fdopen, GLIBC_2_0);
|
|
|
|
|
|
|
|
#endif
|