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>

1 files changed, 478 insertions, 0 deletions

diff --git a/libio/vtables.c b/libio/vtables.c
index 5d5906a818..3facd40a51 100644
--- a/libio/vtables.c
+++ b/libio/vtables.c
@@ -21,6 +21,472 @@
 #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
 
@@ -82,3 +548,15 @@ check_stdfiles_vtables (void)
     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)