ssp: add Object Size Checking for wchar.h, part 1

The following functions are also guarded in glibc:
fwprintf, swprintf, wprintf, vfwprintf, vswprintf, vwprintf.

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

newlib/libc/include/ssp/wchar.h

@@ -0,0 +1,97 @@
+#ifndef _SSP_WCHAR_H_
+#define _SSP_WCHAR_H_
+
+#include <sys/cdefs.h>
+#include <ssp/ssp.h>
+
+#if __SSP_FORTIFY_LEVEL > 0
+
+/* wide character variant, __wlen is number of wchar_t */
+#define __ssp_redirect_wc(rtype, fun, args, call, cond, bos) \
+__ssp_decl(rtype, fun, args) \
+{ \
+	if (cond) \
+		__ssp_check(__buf, __wlen * sizeof(wchar_t), bos); \
+	return __ssp_real_(fun) call; \
+}
+
+#define __ssp_bos_wicheck3(fun) \
+__ssp_redirect_wc(wchar_t *, fun, \
+    (wchar_t *__buf, const wchar_t *__src, size_t __wlen), \
+    (__buf, __src, __wlen), 1, __ssp_bos0)
+
+#define __ssp_bos_wicheck3_restrict(fun) \
+__ssp_redirect_wc(wchar_t *, fun, \
+    (wchar_t *__restrict __buf, const wchar_t *__restrict __src, size_t __wlen), \
+    (__buf, __src, __wlen), 1, __ssp_bos0)
+
+#define __ssp_bos_wicheck2_restrict(fun) \
+__ssp_decl(wchar_t *, fun, (wchar_t *__restrict __buf, const wchar_t *__restrict __src)) \
+{ \
+  __ssp_check(__buf, (wcslen(__src) + 1) * sizeof(wchar_t), __ssp_bos0); \
+  return __ssp_real_(fun) (__buf, __src); \
+}
+
+__BEGIN_DECLS
+#if __POSIX_VISIBLE >= 200809
+__ssp_bos_wicheck2_restrict(wcpcpy)
+__ssp_bos_wicheck3_restrict(wcpncpy)
+#endif
+__ssp_bos_wicheck2_restrict(wcscpy)
+__ssp_bos_wicheck2_restrict(wcscat)
+__ssp_bos_wicheck3_restrict(wcsncpy)
+__ssp_bos_wicheck3_restrict(wcsncat)
+__ssp_bos_wicheck3_restrict(wmemcpy)
+__ssp_bos_wicheck3(wmemmove)
+#if __GNU_VISIBLE
+__ssp_bos_wicheck3_restrict(wmempcpy)
+#endif
+__ssp_redirect_wc(wchar_t *, wmemset, \
+    (wchar_t *__buf, wchar_t __src, size_t __wlen), \
+    (__buf, __src, __wlen), 1, __ssp_bos0)
+
+__ssp_decl(size_t, wcrtomb, (char *__buf, wchar_t __src, mbstate_t *__ps))
+{
+  if (__buf != NULL && __src != L'\0')
+    __ssp_check(__buf, sizeof(wchar_t), __ssp_bos);
+  return __ssp_real_wcrtomb (__buf, __src, __ps);
+}
+
+__ssp_redirect_wc(size_t, mbsrtowcs, \
+    (wchar_t *__buf, const char **__src, size_t __wlen, mbstate_t *__ps), \
+    (__buf, __src, __wlen, __ps), __buf != NULL, __ssp_bos)
+
+__ssp_redirect_raw(size_t, wcsrtombs, \
+    (char *__buf, const wchar_t **__src, size_t __len, mbstate_t *__ps), \
+    (__buf, __src, __len, __ps), __buf != NULL, __ssp_bos)
+
+#if __POSIX_VISIBLE >= 200809
+__ssp_redirect_wc(size_t, mbsnrtowcs, \
+    (wchar_t *__buf, const char **__src, size_t __nms, size_t __wlen, mbstate_t *__ps), \
+    (__buf, __src, __nms, __wlen, __ps), __buf != NULL, __ssp_bos)
+
+__ssp_redirect_raw(size_t, wcsnrtombs, \
+    (char *__buf, const wchar_t **__src, size_t __nwc, size_t __len, mbstate_t *__ps), \
+    (__buf, __src, __nwc, __len, __ps), __buf != NULL, __ssp_bos)
+#endif
+
+__ssp_decl(wchar_t *, fgetws, (wchar_t *__restrict __buf, int __wlen, FILE *__restrict __fp))
+{
+  if (__wlen > 0)
+    __ssp_check(__buf, (size_t)__wlen * sizeof(wchar_t) , __ssp_bos);
+  return __ssp_real_fgetws(__buf, __wlen, __fp);
+}
+
+#if __GNU_VISIBLE
+__ssp_decl(wchar_t *, fgetws_unlocked, (wchar_t *__buf, int __wlen, FILE *__fp))
+{
+  if (__wlen > 0)
+    __ssp_check(__buf, (size_t)__wlen * sizeof(wchar_t) , __ssp_bos);
+  return __ssp_real_fgetws_unlocked(__buf, __wlen, __fp);
+}
+#endif /* __GNU_VISIBLE */
+
+__END_DECLS
+
+#endif /* __SSP_FORTIFY_LEVEL > 0 */
+#endif /* _SSP_WCHAR_H_ */

newlib/libc/include/wchar.h

@@ -332,4 +332,8 @@ int	_EXFUN(_wscanf_r, (struct _reent *, const wchar_t *, ...));
 
 _END_STD_C
 
+#if __SSP_FORTIFY_LEVEL > 0
+#include <ssp/wchar.h>
+#endif
+
 #endif /* _WCHAR_H_ */

newlib/libc/ssp/ssp.tex

@@ -34,6 +34,14 @@ bzero           mempcpy         strcat
 explicit_bzero  memset          strncat
 memcpy          stpcpy          strncpy
 
+@exdent @emph{Wide Character String functions:}
+fgetws          wcrtomb         wcsrtombs
+fgetws_unlocked wcscat          wmemcpy
+mbsnrtowcs      wcscpy          wmemmove
+mbsrtowcs       wcsncat         wmempcpy
+wcpcpy          wcsncpy         wmemset
+wcpncpy         wcsnrtombs
+
 @exdent @emph{Stdio functions:}
 fgets           fread_unlocked  sprintf
 fgets_unlocked  gets            vsnprintf