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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/libioP.h
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/libioP.h')
-rw-r--r--libio/libioP.h29
1 files changed, 28 insertions, 1 deletions
diff --git a/libio/libioP.h b/libio/libioP.h
index 7bdec86a62..66afaa8968 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -476,7 +476,6 @@ extern const struct _IO_jump_t _IO_streambuf_jumps;
 extern const struct _IO_jump_t _IO_old_proc_jumps attribute_hidden;
 extern const struct _IO_jump_t _IO_str_jumps attribute_hidden;
 extern const struct _IO_jump_t _IO_wstr_jumps attribute_hidden;
-extern const struct _IO_codecvt __libio_codecvt attribute_hidden;
 extern int _IO_do_write (FILE *, const char *, size_t);
 libc_hidden_proto (_IO_do_write)
 extern int _IO_new_do_write (FILE *, const char *, size_t);
@@ -932,4 +931,32 @@ IO_validate_vtable (const struct _IO_jump_t *vtable)
   return vtable;
 }
 
+/* Character set conversion.  */
+
+enum __codecvt_result
+{
+  __codecvt_ok,
+  __codecvt_partial,
+  __codecvt_error,
+  __codecvt_noconv
+};
+
+enum __codecvt_result __libio_codecvt_out (struct _IO_codecvt *,
+					   __mbstate_t *,
+					   const wchar_t *,
+					   const wchar_t *,
+					   const wchar_t **, char *,
+					   char *, char **)
+  attribute_hidden;
+enum __codecvt_result __libio_codecvt_in (struct _IO_codecvt *,
+					  __mbstate_t *,
+					  const char *, const char *,
+					  const char **, wchar_t *,
+					  wchar_t *, wchar_t **)
+  attribute_hidden;
+int __libio_codecvt_encoding (struct _IO_codecvt *) attribute_hidden;
+int __libio_codecvt_length (struct _IO_codecvt *, __mbstate_t *,
+			    const char *, const char *, size_t)
+  attribute_hidden;
+
 #endif /* libioP.h.  */