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commit f55e312bcd6582b5ff68fdcc1781c7017796dc91
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Nov 28 14:42:11 2019 +0100
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libio: Disable vtable validation for pre-2.1 interposed handles [BZ #25203]
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Commit c402355dfa7807b8e0adb27c009135a7e2b9f1b0 ("libio: Disable
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vtable validation in case of interposition [BZ #23313]") only covered
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the interposable glibc 2.1 handles, in libio/stdfiles.c. The
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parallel code in libio/oldstdfiles.c needs similar detection logic.
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Fixes (again) commit db3476aff19b75c4fdefbe65fcd5f0a90588ba51
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("libio: Implement vtable verification [BZ #20191]").
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Change-Id: Ief6f9f17e91d1f7263421c56a7dc018f4f595c21
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(cherry picked from commit cb61630ed712d033f54295f776967532d3f4b46a)
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diff --git a/libio/oldstdfiles.c b/libio/oldstdfiles.c
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index f3dda89004..9fe809bd68 100644
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--- a/libio/oldstdfiles.c
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+++ b/libio/oldstdfiles.c
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@@ -87,6 +87,11 @@ _IO_check_libio (void)
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stdout->_vtable_offset = stderr->_vtable_offset =
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((int) sizeof (struct _IO_FILE)
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- (int) sizeof (struct _IO_FILE_complete));
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+
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+ if (_IO_stdin_.vtable != &_IO_old_file_jumps
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+ || _IO_stdout_.vtable != &_IO_old_file_jumps
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+ || _IO_stderr_.vtable != &_IO_old_file_jumps)
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+ IO_set_accept_foreign_vtables (&_IO_vtable_check);
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}
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}
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