fortify-headers

commit 76fef96b2b29fc90cdfea3e595ab98d267c6b965
parent 160298c6fb4c5151ef58ef1556ae2c271d8a9a9e
Author: jvoisin <julien.voisin@dustri.org>
Date:   Sat, 30 Sep 2023 20:24:58 +0200

Add `vprintf`

Diffstat:
M
include/stdio.h
 | 
19
++++++++++++++++++-
M
tests/Makefile
 | 
1
+
A
tests/test_vprintf.c
 | 
16
++++++++++++++++

3 files changed, 35 insertions(+), 1 deletion(-)
diff --git a/include/stdio.h b/include/stdio.h
@@ -36,9 +36,10 @@ extern "C" {
 #undef fread
 #undef fwrite
 #undef popen
+#undef printf
+#undef vprintf
 #undef vsnprintf
 #undef vsprintf
-#undef printf
 
 __access(read_only, 2)
 #if __has_builtin(__builtin_fdopen)
@@ -183,6 +184,22 @@ _FORTIFY_FN(vsprintf) int vsprintf(char * _FORTIFY_POS0 __s, const char *__f,
 #endif
 }
 
+#ifndef __clang__  /* FIXME */
+__access(read_only, 1)
+__format(printf, 1, 0)
+#if __has_builtin(__builtin_vprintf)
+__diagnose_as_builtin(__builtin_vprintf, 1, 2)
+#endif
+_FORTIFY_FN(vprintf) int vprintf(const char *__f, __builtin_va_list __v)
+{
+#if __has_builtin(__builtin___vprintf_chk) && USE_NATIVE_CHK
+	return __builtin___vprintf_chk(_FORTIFY_SOURCE, __f, __v);
+#else
+	return __orig_vprintf(__f, __v);
+#endif
+}
+#endif
+
 
 #if __has_builtin(__builtin_va_arg_pack)
 
diff --git a/tests/Makefile b/tests/Makefile
@@ -113,6 +113,7 @@ RUNTIME_TARGETS= \
 	test_vsnprintf_dynamic       \
 	test_vsnprintf_static        \
 	test_vsprintf                \
+	test_vprintf                 \
 	test_wcscat_static_write     \
 	test_wcscpy_static_write     \
 	test_wcsncat_static_write    \
diff --git a/tests/test_vprintf.c b/tests/test_vprintf.c
@@ -0,0 +1,16 @@
+#include "common.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+void wrap(char *format, ...) {
+  va_list args;
+  va_start(args, format);
+  vprintf(format, args);
+  va_end(args);
+}
+
+
+int main(int argc, char** argv) {
+  wrap("%s", "1234567");
+}