[msan] Intercept wcsncpy, wcsnlen.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@297793 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/msan/msan_interceptors.cc b/lib/msan/msan_interceptors.cc
index 6447bb1b2..f3d5f4a09 100644
--- a/lib/msan/msan_interceptors.cc
+++ b/lib/msan/msan_interceptors.cc
@@ -580,6 +580,13 @@ INTERCEPTOR(SIZE_T, wcslen, const wchar_t *s) {
   return res;
 }
 
+INTERCEPTOR(SIZE_T, wcsnlen, const wchar_t *s, SIZE_T n) {
+  ENSURE_MSAN_INITED();
+  SIZE_T res = REAL(wcsnlen)(s, n);
+  CHECK_UNPOISONED(s, sizeof(wchar_t) * Min(res + 1, n));
+  return res;
+}
+
 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
   ENSURE_MSAN_INITED();
@@ -597,6 +604,18 @@ INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
   return res;
 }
 
+INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src,
+            SIZE_T n) {  // NOLINT
+  ENSURE_MSAN_INITED();
+  GET_STORE_STACK_TRACE;
+  SIZE_T copy_size = REAL(wcsnlen)(src, n);
+  if (copy_size < n) copy_size++;           // trailing \0
+  wchar_t *res = REAL(wcsncpy)(dest, src, n);  // NOLINT
+  CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
+  __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
+  return res;
+}
+
 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
@@ -1565,8 +1584,10 @@ void InitializeInterceptors() {
   INTERCEPT_FUNCTION(mbtowc);
   INTERCEPT_FUNCTION(mbrtowc);
   INTERCEPT_FUNCTION(wcslen);
+  INTERCEPT_FUNCTION(wcsnlen);
   INTERCEPT_FUNCTION(wcschr);
   INTERCEPT_FUNCTION(wcscpy);
+  INTERCEPT_FUNCTION(wcsncpy);
   INTERCEPT_FUNCTION(wcscmp);
   INTERCEPT_FUNCTION(getenv);
   INTERCEPT_FUNCTION(setenv);