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glibc/libio/vtables.c
Adhemerval Zanella Netto 3020f72618 libio: Remove the usage of __libc_IO_vtables 
Instead of using a special ELF section along with a linker script
directive to put the IO vtables within the RELRO section, the libio
vtables are all moved to an array marked as data.relro (so linker
will place in the RELRO segment without the need of extra directives).

To avoid static linking namespace issues and including all vtable
referenced objects, all required function pointers are set to weak alias.

Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2023-03-27 13:57:55 -03:00

563 lines
20 KiB
C
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/* libio vtable validation.
Copyright (C) 2016-2023 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 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.
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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <libioP.h>
#include <stdio.h>
#include <ldsodefs.h>
#include <pointer_guard.h>
#include <libio-macros.h>
/* Both _IO_str_* and _IO_new_file functions are pulled into every link (from
stdio initialization). */
#ifndef SHARED
/* NB: the following directives do add pragma weak for _IO_default _* and
_IO_wdefault_* symbols to potentially avoid link failures, since they
are always used when the __io_vtables is used. */
# pragma weak _IO_wstr_finish
# pragma weak _IO_wstr_overflow
# pragma weak _IO_wstr_pbackfail
# pragma weak _IO_wstr_seekoff
# pragma weak _IO_wstr_underflow
# pragma weak _IO_file_close
# pragma weak _IO_file_close_mmap
# pragma weak _IO_file_doallocate
# pragma weak _IO_file_finish
# pragma weak _IO_file_jumps_alias
# pragma weak _IO_file_overflow
# pragma weak _IO_file_read
# pragma weak _IO_file_seek
# pragma weak _IO_file_seekoff_maybe_mmap
# pragma weak _IO_file_seekoff_mmap
# pragma weak _IO_file_setbuf
# pragma weak _IO_file_setbuf_mmap
# pragma weak _IO_file_setbuf_mmap
# pragma weak _IO_file_stat
# pragma weak _IO_file_sync
# pragma weak _IO_file_sync_mmap
# pragma weak _IO_file_underflow
# pragma weak _IO_file_underflow_maybe_mmap
# pragma weak _IO_file_underflow_mmap
# pragma weak _IO_file_xsgetn
# pragma weak _IO_file_xsgetn_maybe_mmap
# pragma weak _IO_file_xsgetn_mmap
# pragma weak _IO_file_xsputn
# pragma weak _IO_wfile_overflow
# pragma weak _IO_wfile_sync
# pragma weak _IO_wfile_underflow
# pragma weak _IO_wfile_underflow_maybe_mmap
# pragma weak _IO_wfile_underflow_mmap
# pragma weak _IO_wfile_doallocate
# pragma weak _IO_wfile_jumps_alia
# pragma weak _IO_wfile_seekoff
# pragma weak _IO_wfile_xsputn
# pragma weak _IO_new_proc_close
# pragma weak _IO_cookie_close
# pragma weak _IO_cookie_read
# pragma weak _IO_cookie_seek
# pragma weak _IO_cookie_seekoff
# pragma weak _IO_cookie_write
# pragma weak _IO_mem_finish
# pragma weak _IO_mem_sync
# pragma weak _IO_wmem_finish
# pragma weak _IO_wmem_sync
# pragma weak __printf_buffer_as_file_overflow
# pragma weak __printf_buffer_as_file_xsputn
# pragma weak __wprintf_buffer_as_file_overflow
# pragma weak __wprintf_buffer_as_file_xsputn
#endif
const struct _IO_jump_t __io_vtables[IO_VTABLES_LEN] attribute_relro =
{
/* _IO_str_jumps */
[IO_STR_JUMPS] =
{
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_str_finish),
JUMP_INIT (overflow, _IO_str_overflow),
JUMP_INIT (underflow, _IO_str_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_str_pbackfail),
JUMP_INIT (xsputn, _IO_default_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_str_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_default_setbuf),
JUMP_INIT (sync, _IO_default_sync),
JUMP_INIT (doallocate, _IO_default_doallocate),
JUMP_INIT (read, _IO_default_read),
JUMP_INIT (write, _IO_default_write),
JUMP_INIT (seek, _IO_default_seek),
JUMP_INIT (close, _IO_default_close),
JUMP_INIT (stat, _IO_default_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_wstr_jumps */
[IO_WSTR_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_wstr_finish),
JUMP_INIT (overflow, (_IO_overflow_t) _IO_wstr_overflow),
JUMP_INIT (underflow, (_IO_underflow_t) _IO_wstr_underflow),
JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
JUMP_INIT (xsputn, _IO_wdefault_xsputn),
JUMP_INIT (xsgetn, _IO_wdefault_xsgetn),
JUMP_INIT (seekoff, _IO_wstr_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_default_setbuf),
JUMP_INIT (sync, _IO_default_sync),
JUMP_INIT (doallocate, _IO_wdefault_doallocate),
JUMP_INIT (read, _IO_default_read),
JUMP_INIT (write, _IO_default_write),
JUMP_INIT (seek, _IO_default_seek),
JUMP_INIT (close, _IO_default_close),
JUMP_INIT (stat, _IO_default_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_file_jumps */
[IO_FILE_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_file_finish),
JUMP_INIT (overflow, _IO_file_overflow),
JUMP_INIT (underflow, _IO_file_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_file_xsputn),
JUMP_INIT (xsgetn, _IO_file_xsgetn),
JUMP_INIT (seekoff, _IO_new_file_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_new_file_setbuf),
JUMP_INIT (sync, _IO_new_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_file_jumps_mmap */
[IO_FILE_JUMPS_MMAP] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_file_finish),
JUMP_INIT (overflow, _IO_file_overflow),
JUMP_INIT (underflow, _IO_file_underflow_mmap),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_new_file_xsputn),
JUMP_INIT (xsgetn, _IO_file_xsgetn_mmap),
JUMP_INIT (seekoff, _IO_file_seekoff_mmap),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, (_IO_setbuf_t) _IO_file_setbuf_mmap),
JUMP_INIT (sync, _IO_file_sync_mmap),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close_mmap),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_file_jumps_maybe_mmap */
[IO_FILE_JUMPS_MAYBE_MMAP] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_file_finish),
JUMP_INIT (overflow, _IO_file_overflow),
JUMP_INIT (underflow, _IO_file_underflow_maybe_mmap),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_new_file_xsputn),
JUMP_INIT (xsgetn, _IO_file_xsgetn_maybe_mmap),
JUMP_INIT (seekoff, _IO_file_seekoff_maybe_mmap),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, (_IO_setbuf_t) _IO_file_setbuf_mmap),
JUMP_INIT (sync, _IO_new_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_wfile_jumps */
[IO_WFILE_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_new_file_finish),
JUMP_INIT (overflow, (_IO_overflow_t) _IO_wfile_overflow),
JUMP_INIT (underflow, (_IO_underflow_t) _IO_wfile_underflow),
JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
JUMP_INIT (xsputn, _IO_wfile_xsputn),
JUMP_INIT (xsgetn, _IO_file_xsgetn),
JUMP_INIT (seekoff, _IO_wfile_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_new_file_setbuf),
JUMP_INIT (sync, (_IO_sync_t) _IO_wfile_sync),
JUMP_INIT (doallocate, _IO_wfile_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_wfile_jumps_mmap */
[IO_WFILE_JUMPS_MMAP] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_new_file_finish),
JUMP_INIT (overflow, (_IO_overflow_t) _IO_wfile_overflow),
JUMP_INIT (underflow, (_IO_underflow_t) _IO_wfile_underflow_mmap),
JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
JUMP_INIT (xsputn, _IO_wfile_xsputn),
JUMP_INIT (xsgetn, _IO_file_xsgetn),
JUMP_INIT (seekoff, _IO_wfile_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_file_setbuf_mmap),
JUMP_INIT (sync, (_IO_sync_t) _IO_wfile_sync),
JUMP_INIT (doallocate, _IO_wfile_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close_mmap),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_wfile_jumps_maybe_mmap */
[IO_WFILE_JUMPS_MAYBE_MMAP] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_new_file_finish),
JUMP_INIT (overflow, (_IO_overflow_t) _IO_wfile_overflow),
JUMP_INIT (underflow, (_IO_underflow_t) _IO_wfile_underflow_maybe_mmap),
JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
JUMP_INIT (xsputn, _IO_wfile_xsputn),
JUMP_INIT (xsgetn, _IO_file_xsgetn),
JUMP_INIT (seekoff, _IO_wfile_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_file_setbuf_mmap),
JUMP_INIT (sync, (_IO_sync_t) _IO_wfile_sync),
JUMP_INIT (doallocate, _IO_wfile_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_cookie_jumps */
[IO_COOKIE_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_file_finish),
JUMP_INIT (overflow, _IO_file_overflow),
JUMP_INIT (underflow, _IO_file_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_file_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_cookie_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_file_setbuf),
JUMP_INIT (sync, _IO_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_cookie_read),
JUMP_INIT (write, _IO_cookie_write),
JUMP_INIT (seek, _IO_cookie_seek),
JUMP_INIT (close, _IO_cookie_close),
JUMP_INIT (stat, _IO_default_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue),
},
/* _IO_proc_jumps */
[IO_PROC_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_new_file_finish),
JUMP_INIT (overflow, _IO_new_file_overflow),
JUMP_INIT (underflow, _IO_new_file_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_new_file_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_new_file_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_new_file_setbuf),
JUMP_INIT (sync, _IO_new_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_new_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_new_proc_close),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_mem_jumps */
[IO_MEM_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_mem_finish),
JUMP_INIT (overflow, _IO_str_overflow),
JUMP_INIT (underflow, _IO_str_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_str_pbackfail),
JUMP_INIT (xsputn, _IO_default_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_str_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_default_setbuf),
JUMP_INIT (sync, _IO_mem_sync),
JUMP_INIT (doallocate, _IO_default_doallocate),
JUMP_INIT (read, _IO_default_read),
JUMP_INIT (write, _IO_default_write),
JUMP_INIT (seek, _IO_default_seek),
JUMP_INIT (close, _IO_default_close),
JUMP_INIT (stat, _IO_default_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
/* _IO_wmem_jumps */
[IO_WMEM_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_wmem_finish),
JUMP_INIT (overflow, (_IO_overflow_t) _IO_wstr_overflow),
JUMP_INIT (underflow, (_IO_underflow_t) _IO_wstr_underflow),
JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
JUMP_INIT (xsputn, _IO_wdefault_xsputn),
JUMP_INIT (xsgetn, _IO_wdefault_xsgetn),
JUMP_INIT (seekoff, _IO_wstr_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_default_setbuf),
JUMP_INIT (sync, _IO_wmem_sync),
JUMP_INIT (doallocate, _IO_wdefault_doallocate),
JUMP_INIT (read, _IO_default_read),
JUMP_INIT (write, _IO_default_write),
JUMP_INIT (seek, _IO_default_seek),
JUMP_INIT (close, _IO_default_close),
JUMP_INIT (stat, _IO_default_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
[IO_PRINTF_BUFFER_AS_FILE_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, NULL),
JUMP_INIT (overflow, __printf_buffer_as_file_overflow),
JUMP_INIT (underflow, NULL),
JUMP_INIT (uflow, NULL),
JUMP_INIT (pbackfail, NULL),
JUMP_INIT (xsputn, __printf_buffer_as_file_xsputn),
JUMP_INIT (xsgetn, NULL),
JUMP_INIT (seekoff, NULL),
JUMP_INIT (seekpos, NULL),
JUMP_INIT (setbuf, NULL),
JUMP_INIT (sync, NULL),
JUMP_INIT (doallocate, NULL),
JUMP_INIT (read, NULL),
JUMP_INIT (write, NULL),
JUMP_INIT (seek, NULL),
JUMP_INIT (close, NULL),
JUMP_INIT (stat, NULL),
JUMP_INIT (showmanyc, NULL),
JUMP_INIT (imbue, NULL)
},
[IO_WPRINTF_BUFFER_AS_FILE_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, NULL),
JUMP_INIT (overflow, (_IO_overflow_t) __wprintf_buffer_as_file_overflow),
JUMP_INIT (underflow, NULL),
JUMP_INIT (uflow, NULL),
JUMP_INIT (pbackfail, NULL),
JUMP_INIT (xsputn, __wprintf_buffer_as_file_xsputn),
JUMP_INIT (xsgetn, NULL),
JUMP_INIT (seekoff, NULL),
JUMP_INIT (seekpos, NULL),
JUMP_INIT (setbuf, NULL),
JUMP_INIT (sync, NULL),
JUMP_INIT (doallocate, NULL),
JUMP_INIT (read, NULL),
JUMP_INIT (write, NULL),
JUMP_INIT (seek, NULL),
JUMP_INIT (close, NULL),
JUMP_INIT (stat, NULL),
JUMP_INIT (showmanyc, NULL),
JUMP_INIT (imbue, NULL)
},
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
/* _IO_old_file_jumps */
[IO_OLD_FILE_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_old_file_finish),
JUMP_INIT (overflow, _IO_old_file_overflow),
JUMP_INIT (underflow, _IO_old_file_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_old_file_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_old_file_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_old_file_setbuf),
JUMP_INIT (sync, _IO_old_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_old_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_file_close),
JUMP_INIT (stat, _IO_file_stat)
},
/* _IO_old_proc_jumps */
[IO_OLD_PROC_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_old_file_finish),
JUMP_INIT (overflow, _IO_old_file_overflow),
JUMP_INIT (underflow, _IO_old_file_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_old_file_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_old_file_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_old_file_setbuf),
JUMP_INIT (sync, _IO_old_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_file_read),
JUMP_INIT (write, _IO_old_file_write),
JUMP_INIT (seek, _IO_file_seek),
JUMP_INIT (close, _IO_old_proc_close),
JUMP_INIT (stat, _IO_file_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue)
},
#endif
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
/* _IO_old_cookie_jumps */
[IO_OLD_COOKIED_JUMPS] = {
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_file_finish),
JUMP_INIT (overflow, _IO_file_overflow),
JUMP_INIT (underflow, _IO_file_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_file_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_cookie_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_file_setbuf),
JUMP_INIT (sync, _IO_file_sync),
JUMP_INIT (doallocate, _IO_file_doallocate),
JUMP_INIT (read, _IO_cookie_read),
JUMP_INIT (write, _IO_cookie_write),
JUMP_INIT (seek, _IO_old_cookie_seek),
JUMP_INIT (close, _IO_cookie_close),
JUMP_INIT (stat, _IO_default_stat),
JUMP_INIT (showmanyc, _IO_default_showmanyc),
JUMP_INIT (imbue, _IO_default_imbue),
},
#endif
};
#ifdef SHARED
void (*IO_accept_foreign_vtables) (void) attribute_hidden;
#else /* !SHARED */
/* Used to check whether static dlopen support is needed. */
# pragma weak __dlopen
#endif
void attribute_hidden
_IO_vtable_check (void)
{
#ifdef SHARED
/* Honor the compatibility flag. */
void (*flag) (void) = atomic_load_relaxed (&IO_accept_foreign_vtables);
PTR_DEMANGLE (flag);
if (flag == &_IO_vtable_check)
return;
/* In case this libc copy is in a non-default namespace, we always
need to accept foreign vtables because there is always a
possibility that FILE * objects are passed across the linking
boundary. */
{
Dl_info di;
struct link_map *l;
if (!rtld_active ()
|| (_dl_addr (_IO_vtable_check, &di, &l, NULL) != 0
&& l->l_ns != LM_ID_BASE))
return;
}
#else /* !SHARED */
/* We cannot perform vtable validation in the static dlopen case
because FILE * handles might be passed back and forth across the
boundary. Therefore, we disable checking in this case. */
if (__dlopen != NULL)
return;
#endif
__libc_fatal ("Fatal error: glibc detected an invalid stdio handle\n");
}
/* Some variants of libstdc++ interpose _IO_2_1_stdin_ etc. and
install their own vtables directly, without calling _IO_init or
other functions. Detect this by looking at the vtables values
during startup, and disable vtable validation in this case. */
#ifdef SHARED
__attribute__ ((constructor))
static void
check_stdfiles_vtables (void)
{
if (_IO_2_1_stdin_.vtable != &_IO_file_jumps
|| _IO_2_1_stdout_.vtable != &_IO_file_jumps
|| _IO_2_1_stderr_.vtable != &_IO_file_jumps)
IO_set_accept_foreign_vtables (&_IO_vtable_check);
}
#endif
#define STR(s) XSTR(s)
#define XSTR(s) #s
#undef _IO_file_jumps
#define _IO_file_jumps_alias "__io_vtables + " STR(IO_FILE_JUMPS_OFFSET)
declare_object_symbol_alias (_IO_file_jumps, _IO_file_jumps_alias,
IO_JUMP_T_SIZE)
#undef _IO_wfile_jumps
#define _IO_wfile_jumps_alias "__io_vtables + " STR(IO_WFILE_JUMPS_OFFSET)
declare_object_symbol_alias (_IO_wfile_jumps, _IO_wfile_jumps_alias,
IO_JUMP_T_SIZE)
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