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diff --git a/test/msan/strlen_of_shadow.cc b/test/msan/strlen_of_shadow.cc
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+++ b/test/msan/strlen_of_shadow.cc
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+// RUN: %clangxx_msan -m64 -O0 %s -o %t && %run %t
+
+// Check that strlen() and similar intercepted functions can be called on shadow
+// memory.
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+const char *mem_to_shadow(const char *p) {
+ return (char *)((uintptr_t)p & ~0x400000000000ULL);
+}
+
+int main(void) {
+ const char *s = "abcdef";
+ assert(strlen(s) == 6);
+ assert(strlen(mem_to_shadow(s)) == 0);
+
+ char *t = new char[42];
+ t[41] = 0;
+ assert(strlen(mem_to_shadow(t)) == 41);
+ return 0;
+}