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libio: Disable vtable validation for pre-2.1 interposed handles [BZ #25203]

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Commit c402355dfa ("libio: Disable
vtable validation in case of interposition [BZ #23313]") only covered
the interposable glibc 2.1 handles, in libio/stdfiles.c.  The
parallel code in libio/oldstdfiles.c needs similar detection logic.

Fixes (again) commit db3476aff1
("libio: Implement vtable verification [BZ #20191]").

Change-Id: Ief6f9f17e91d1f7263421c56a7dc018f4f595c21
(cherry picked from commit cb61630ed7)
This commit is contained in:
Florian Weimer 2019-11-22 22:10:42 +01:00
parent 8440c51d89
commit a0408ec51e
1 changed files with 5 additions and 0 deletions
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5
libio/oldstdfiles.c
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@ -87,6 +87,11 @@ _IO_check_libio (void)
stdout->_vtable_offset = stderr->_vtable_offset =
((int) sizeof (struct _IO_FILE)
- (int) sizeof (struct _IO_FILE_complete));
if (_IO_stdin_.vtable != &_IO_old_file_jumps
|| _IO_stdout_.vtable != &_IO_old_file_jumps
|| _IO_stderr_.vtable != &_IO_old_file_jumps)
IO_set_accept_foreign_vtables (&_IO_vtable_check);
}
}