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authorFlorian Weimer <fweimer@redhat.com>2019-05-20 21:54:57 +0200
committerFlorian Weimer <fweimer@redhat.com>2019-05-20 21:54:57 +0200
commit09e1b0e3f6facc1af2dbcfef204f0aaa8718772b (patch)
tree18056a8f7177511eff47519d176c310901f5e455 /libio/iofsetpos64.c
parent75c51570c710aa9c6df6b7a1e131392e1408c63f (diff)
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libio: Remove codecvt vtable [BZ #24588]
The codecvt vtable is not a real vtable because it also contains the
conversion state data.  Furthermore, wide stream support was added to
GCC 3.0, after a C++ ABI bump, so there is no compatibility
requirement with libstdc++.

This change removes several unmangled function pointers which could
be used with a corrupted FILE object to redirect execution.  (libio
vtable verification did not cover the codecvt vtable.)

Reviewed-by: Yann Droneaud <ydroneaud@opteya.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'libio/iofsetpos64.c')
-rw-r--r--libio/iofsetpos64.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/libio/iofsetpos64.c b/libio/iofsetpos64.c
index d1865b728e..f382ba0dc1 100644
--- a/libio/iofsetpos64.c
+++ b/libio/iofsetpos64.c
@@ -48,8 +48,7 @@ _IO_new_fsetpos64 (FILE *fp, const fpos64_t *posp)
   else
     {
       result = 0;
-      if (fp->_mode > 0
-	  && (*fp->_codecvt->__codecvt_do_encoding) (fp->_codecvt) < 0)
+      if (fp->_mode > 0 && __libio_codecvt_encoding (fp->_codecvt) < 0)
 	/* This is a stateful encoding, safe the state.  */
 	fp->_wide_data->_IO_state = posp->__state;
     }