[compiler-rt] change internal internal libc invariants

[michaelrj]

Summary

llvm-libc is expected to be built with sanitizers and not use interceptors in
the long run. For now though, we have a hybrid process, where functions
implemented in llvm-libc are instrumented, and glibc fills and sanitizer
interceptors fill in the rest.

Current sanitizers have an invariant that the REAL(...) function called from
inside of an interceptor is uninstrumented. A lot of interceptors call strlen()
in order to figure out the size of the region to check/poison. Switch these
callsites over to the internal, unsanitized implementation.

[hctim]

Thank you for the patch.

Can you please update the commit message to be a little more clear and mention that we're changing an invariant here? Something like:

llvm-libc is expected to be built with sanitizers and not use interceptors in
the long run. For now though, we have a hybrid process, where functions
implemented in llvm-libc are instrumented, and glibc fills and sanitizer
interceptors fill in the rest.

Current sanitizers have an invariant that the REAL(...) function called from
inside of an interceptor is uninstrumented. A lot of interceptors call strlen()
in order to figure out the size of the region to check/poison. Switch these
callsites over to the internal, unsanitized implementation.

We'll need to give the same treatment to wcslen, wcsnlen, and strnlen. The interceptors of those functions should call REAL(...), but all other interceptors need to be updated. I'm sure we'll hit other points that'll need patching, but I'm happy to play whack-a-mole now that we're changing the invariant. You'll also need to add the internal_w* variants in sanitizer_libc.cpp and sanitizer_libc.h, but those should be pretty easy, something like:

uptr internal_ wcslen(wchar_t *s) {
  uptr i = 0;
  while (s[i]) i++;
  return i;
}

I've marked some of the sites that need to be updated, but it's not an exhaustive list.

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

380

this comment shouldn't be updated

387

don't update

7000–7001

internal_wcslen

7001–7002

internal_wcslen

7012–7013

internal_wcsnlen

7013–7014

internal_wcslen

7047

mitch review marker

[sivachandra]

In D108316#2955756, @hctim wrote:

I'm sure we'll hit other points that'll need patching, but I'm happy to play whack-a-mole now that we're changing the invariant.

For the long-term, it would be nice if we can set up compiler-rt to pick up libc pieces from LLVM libc directly. As in, at compiler-rt build-time, pull the libc pieces necessary from LLVM libc and pack them with the compiler-rt binaries. We will need to employ some namespace discipline of course to get it working, but at the least it has the benefit that we avoid duplication with internal_* implementations.

[michaelrj]

update commit message, add internal_wcslen and internal_wcsnlen, and use them where suggested by the comments.

[michaelrj]

fix typo that was preventing building

[hctim]

Can you do one more parse over REAL(wcsnlen), REAL(wcslen), and REAL(strnlen) to replace instances of those with internal_* variants when used in an interceptor annotation? Looks like a few are missing.

[eugenis]

In D108316#2955912, @sivachandra wrote:

In D108316#2955756, @hctim wrote:

I'm sure we'll hit other points that'll need patching, but I'm happy to play whack-a-mole now that we're changing the invariant.

For the long-term, it would be nice if we can set up compiler-rt to pick up libc pieces from LLVM libc directly. As in, at compiler-rt build-time, pull the libc pieces necessary from LLVM libc and pack them with the compiler-rt binaries. We will need to employ some namespace discipline of course to get it working, but at the least it has the benefit that we avoid duplication with internal_* implementations.

Yes, a private copy of some libc functions would be nice to have. We already had to optimize internal_memset a little because it showed up in the profiles, it would be great not to duplicate the effort.

[michaelrj]

Replace additional uses of REAL strnlen, wcslen, and wcsnlen

[vitalybuka]

internal_strlen is slower on synthetic benchmark with strlen only, but I tried CTMark and other more real sets and can't measure a difference.
LGTM with extended test

compiler-rt/lib/sanitizer_common/sanitizer_libc.cpp

261

Can you please add tests similar to InternalStrFunctions compiler-rt/lib/sanitizer_common/tests/sanitizer_libc_test.cpp

[michaelrj]

add tests for wcslen and wcsnlen

[hctim]

LGTM with final nits.

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

401

Okay to call REAL(strnlen) here as, if we're using interceptors, the backing function shouldn't be instrumented.

Assumedly the REAL() variant is SIMD and faster.

401

Okay to call REAL(strnlen) here as, if we're using interceptors, the backing function shouldn't be instrumented.

Assumedly the REAL() variant is SIMD and faster.

6981

ditto, REAL(wcslen)

6989

ditto, REAL(wcsnlen)

[michaelrj]

address final nits, will submit once the presubmits are done

compiler-rt/lib/asan/asan_interceptors.cpp

 #  endif
 
 namespace __asan {
 
 #define ASAN_READ_STRING_OF_LEN(ctx, s, len, n)                 \
   ASAN_READ_RANGE((ctx), (s),                                   \
     common_flags()->strict_string_checks ? (len) + 1 : (n))
 
-#define ASAN_READ_STRING(ctx, s, n)                             \
-  ASAN_READ_STRING_OF_LEN((ctx), (s), REAL(strlen)(s), (n))
+#  define ASAN_READ_STRING(ctx, s, n) \
+    ASAN_READ_STRING_OF_LEN((ctx), (s), internal_strlen(s), (n))
 
 static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
 #if SANITIZER_INTERCEPT_STRNLEN
   if (REAL(strnlen)) {
     return REAL(strnlen)(s, maxlen);
   }
 #endif
   return internal_strnlen(s, maxlen);

 
 // For both strcat() and strncat() we need to check the validity of |to|
 // argument irrespective of the |from| length.
   INTERCEPTOR(char *, strcat, char *to, const char *from) {
     void *ctx;
     ASAN_INTERCEPTOR_ENTER(ctx, strcat);
     ENSURE_ASAN_INITED();
     if (flags()->replace_str) {
-      uptr from_length = REAL(strlen)(from);
+      uptr from_length = internal_strlen(from);
       ASAN_READ_RANGE(ctx, from, from_length + 1);
-      uptr to_length = REAL(strlen)(to);
+      uptr to_length = internal_strlen(to);
       ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length);
       ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1);
       // If the copying actually happens, the |from| string should not overlap
       // with the resulting string starting at |to|, which has a length of
       // to_length + from_length + 1.
       if (from_length > 0) {
         CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1, from,
                              from_length + 1);
       }
     }
     return REAL(strcat)(to, from);
   }
 
 INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strncat);
   ENSURE_ASAN_INITED();
   if (flags()->replace_str) {
     uptr from_length = MaybeRealStrnlen(from, size);
     uptr copy_length = Min(size, from_length + 1);
     ASAN_READ_RANGE(ctx, from, copy_length);
-    uptr to_length = REAL(strlen)(to);
+    uptr to_length = internal_strlen(to);
     ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length);
     ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1);
     if (from_length > 0) {
       CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1,
                            from, copy_length);
     }
   }
   return REAL(strncat)(to, from, size);
 }
 
 INTERCEPTOR(char *, strcpy, char *to, const char *from) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strcpy);
 #if SANITIZER_MAC
   if (UNLIKELY(!asan_inited))
     return REAL(strcpy)(to, from);
 #endif
   // strcpy is called from malloc_default_purgeable_zone()
   // in __asan::ReplaceSystemAlloc() on Mac.
   if (asan_init_is_running) {
     return REAL(strcpy)(to, from);
   }
   ENSURE_ASAN_INITED();
   if (flags()->replace_str) {
-    uptr from_size = REAL(strlen)(from) + 1;
+    uptr from_size = internal_strlen(from) + 1;
     CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size);
     ASAN_READ_RANGE(ctx, from, from_size);
     ASAN_WRITE_RANGE(ctx, to, from_size);
   }
   return REAL(strcpy)(to, from);
 }
 
 INTERCEPTOR(char*, strdup, const char *s) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strdup);
   if (UNLIKELY(!asan_inited)) return internal_strdup(s);
   ENSURE_ASAN_INITED();
-  uptr length = REAL(strlen)(s);
+  uptr length = internal_strlen(s);
   if (flags()->replace_str) {
     ASAN_READ_RANGE(ctx, s, length + 1);
   }
   GET_STACK_TRACE_MALLOC;
   void *new_mem = asan_malloc(length + 1, &stack);
   REAL(memcpy)(new_mem, s, length + 1);
   return reinterpret_cast<char*>(new_mem);
 }
 
 #if ASAN_INTERCEPT___STRDUP
 INTERCEPTOR(char*, __strdup, const char *s) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strdup);
   if (UNLIKELY(!asan_inited)) return internal_strdup(s);
   ENSURE_ASAN_INITED();
-  uptr length = REAL(strlen)(s);
+  uptr length = internal_strlen(s);
   if (flags()->replace_str) {
     ASAN_READ_RANGE(ctx, s, length + 1);
   }
   GET_STACK_TRACE_MALLOC;
   void *new_mem = asan_malloc(length + 1, &stack);
   REAL(memcpy)(new_mem, s, length + 1);
   return reinterpret_cast<char*>(new_mem);
 }

compiler-rt/lib/memprof/memprof_interceptors.cpp

 ALIAS(WRAPPER_NAME(strchr));
 
 // For both strcat() and strncat() we need to check the validity of |to|
 // argument irrespective of the |from| length.
 INTERCEPTOR(char *, strcat, char *to, const char *from) {
   void *ctx;
   MEMPROF_INTERCEPTOR_ENTER(ctx, strcat);
   ENSURE_MEMPROF_INITED();
-  uptr from_length = REAL(strlen)(from);
+  uptr from_length = internal_strlen(from);
   MEMPROF_READ_RANGE(from, from_length + 1);
-  uptr to_length = REAL(strlen)(to);
+  uptr to_length = internal_strlen(to);
   MEMPROF_READ_STRING(to, to_length);
   MEMPROF_WRITE_RANGE(to + to_length, from_length + 1);
   return REAL(strcat)(to, from);
 }
 
 INTERCEPTOR(char *, strncat, char *to, const char *from, uptr size) {
   void *ctx;
   MEMPROF_INTERCEPTOR_ENTER(ctx, strncat);
   ENSURE_MEMPROF_INITED();
   uptr from_length = MaybeRealStrnlen(from, size);
   uptr copy_length = Min(size, from_length + 1);
   MEMPROF_READ_RANGE(from, copy_length);
-  uptr to_length = REAL(strlen)(to);
+  uptr to_length = internal_strlen(to);
   MEMPROF_READ_STRING(to, to_length);
   MEMPROF_WRITE_RANGE(to + to_length, from_length + 1);
   return REAL(strncat)(to, from, size);
 }
 
 INTERCEPTOR(char *, strcpy, char *to, const char *from) {
   void *ctx;
   MEMPROF_INTERCEPTOR_ENTER(ctx, strcpy);
   if (memprof_init_is_running) {
     return REAL(strcpy)(to, from);
   }
   ENSURE_MEMPROF_INITED();
-  uptr from_size = REAL(strlen)(from) + 1;
+  uptr from_size = internal_strlen(from) + 1;
   MEMPROF_READ_RANGE(from, from_size);
   MEMPROF_WRITE_RANGE(to, from_size);
   return REAL(strcpy)(to, from);
 }
 
 INTERCEPTOR(char *, strdup, const char *s) {
   void *ctx;
   MEMPROF_INTERCEPTOR_ENTER(ctx, strdup);
   if (UNLIKELY(!memprof_inited))
     return internal_strdup(s);
   ENSURE_MEMPROF_INITED();
-  uptr length = REAL(strlen)(s);
+  uptr length = internal_strlen(s);
   MEMPROF_READ_RANGE(s, length + 1);
   GET_STACK_TRACE_MALLOC;
   void *new_mem = memprof_malloc(length + 1, &stack);
   REAL(memcpy)(new_mem, s, length + 1);
   return reinterpret_cast<char *>(new_mem);
 }
 
 INTERCEPTOR(char *, __strdup, const char *s) {
   void *ctx;
   MEMPROF_INTERCEPTOR_ENTER(ctx, strdup);
   if (UNLIKELY(!memprof_inited))
     return internal_strdup(s);
   ENSURE_MEMPROF_INITED();
-  uptr length = REAL(strlen)(s);
+  uptr length = internal_strlen(s);
   MEMPROF_READ_RANGE(s, length + 1);
   GET_STACK_TRACE_MALLOC;
   void *new_mem = memprof_malloc(length + 1, &stack);
   REAL(memcpy)(new_mem, s, length + 1);
   return reinterpret_cast<char *>(new_mem);
 }
 
 INTERCEPTOR(char *, strncpy, char *to, const char *from, uptr size) {

compiler-rt/lib/msan/msan_interceptors.cpp

 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
 #else
 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
 #endif
 
 INTERCEPTOR(char *, strcpy, char *dest, const char *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T n = REAL(strlen)(src);
+  SIZE_T n = internal_strlen(src);
   CHECK_UNPOISONED_STRING(src + n, 0);
   char *res = REAL(strcpy)(dest, src);
   CopyShadowAndOrigin(dest, src, n + 1, &stack);
   return res;
 }
 
 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T copy_size = REAL(strnlen)(src, n);
+  SIZE_T copy_size = internal_strnlen(src, n);
   if (copy_size < n)
     copy_size++;  // trailing \0
   char *res = REAL(strncpy)(dest, src, n);
   CopyShadowAndOrigin(dest, src, copy_size, &stack);
   __msan_unpoison(dest + copy_size, n - copy_size);
   return res;
 }
 
 #if !SANITIZER_NETBSD
 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T n = REAL(strlen)(src);
+  SIZE_T n = internal_strlen(src);
   CHECK_UNPOISONED_STRING(src + n, 0);
   char *res = REAL(stpcpy)(dest, src);
   CopyShadowAndOrigin(dest, src, n + 1, &stack);
   return res;
 }
 #define MSAN_MAYBE_INTERCEPT_STPCPY INTERCEPT_FUNCTION(stpcpy)
 #else
 #define MSAN_MAYBE_INTERCEPT_STPCPY
 #endif
 
 INTERCEPTOR(char *, strdup, char *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   // On FreeBSD strdup() leverages strlen().
   InterceptorScope interceptor_scope;
-  SIZE_T n = REAL(strlen)(src);
+  SIZE_T n = internal_strlen(src);
   CHECK_UNPOISONED_STRING(src + n, 0);
   char *res = REAL(strdup)(src);
   CopyShadowAndOrigin(res, src, n + 1, &stack);
   return res;
 }
 
 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
 INTERCEPTOR(char *, __strdup, char *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T n = REAL(strlen)(src);
+  SIZE_T n = internal_strlen(src);
   CHECK_UNPOISONED_STRING(src + n, 0);
   char *res = REAL(__strdup)(src);
   CopyShadowAndOrigin(res, src, n + 1, &stack);
   return res;
 }
 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
 #else
 #define MSAN_MAYBE_INTERCEPT___STRDUP
 #endif
 
 #if !SANITIZER_NETBSD
 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
   ENSURE_MSAN_INITED();
   char *res = REAL(gcvt)(number, ndigit, buf);
-  SIZE_T n = REAL(strlen)(buf);
+  SIZE_T n = internal_strlen(buf);
   __msan_unpoison(buf, n + 1);
   return res;
 }
 #define MSAN_MAYBE_INTERCEPT_GCVT INTERCEPT_FUNCTION(gcvt)
 #else
 #define MSAN_MAYBE_INTERCEPT_GCVT
 #endif
 
 INTERCEPTOR(char *, strcat, char *dest, const char *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T src_size = REAL(strlen)(src);
-  SIZE_T dest_size = REAL(strlen)(dest);
+  SIZE_T src_size = internal_strlen(src);
+  SIZE_T dest_size = internal_strlen(dest);
   CHECK_UNPOISONED_STRING(src + src_size, 0);
   CHECK_UNPOISONED_STRING(dest + dest_size, 0);
   char *res = REAL(strcat)(dest, src);
   CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
   return res;
 }
 
 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T dest_size = REAL(strlen)(dest);
-  SIZE_T copy_size = REAL(strnlen)(src, n);
+  SIZE_T dest_size = internal_strlen(dest);
+  SIZE_T copy_size = internal_strnlen(src, n);
   CHECK_UNPOISONED_STRING(dest + dest_size, 0);
   char *res = REAL(strncat)(dest, src, n);
   CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
   __msan_unpoison(dest + dest_size + copy_size, 1); // \0
   return res;
 }
 
 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to

 }
 
 #if !SANITIZER_NETBSD
 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
   ENSURE_MSAN_INITED();
   char *res = REAL(fcvt)(x, a, b, c);
   __msan_unpoison(b, sizeof(*b));
   __msan_unpoison(c, sizeof(*c));
-  if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
+  if (res)
+    __msan_unpoison(res, internal_strlen(res) + 1);
   return res;
 }
 #define MSAN_MAYBE_INTERCEPT_FCVT INTERCEPT_FUNCTION(fcvt)
 #else
 #define MSAN_MAYBE_INTERCEPT_FCVT
 #endif
 
 INTERCEPTOR(char *, getenv, char *name) {
   if (msan_init_is_running)
     return REAL(getenv)(name);
   ENSURE_MSAN_INITED();
   char *res = REAL(getenv)(name);
-  if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
+  if (res)
+    __msan_unpoison(res, internal_strlen(res) + 1);
   return res;
 }
 
 extern char **environ;
 
 static void UnpoisonEnviron() {
   char **envp = environ;
   for (; *envp; ++envp) {
     __msan_unpoison(envp, sizeof(*envp));
-    __msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
+    __msan_unpoison(*envp, internal_strlen(*envp) + 1);
   }
   // Trailing NULL pointer.
   __msan_unpoison(envp, sizeof(*envp));
 }
 
 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
   ENSURE_MSAN_INITED();
   CHECK_UNPOISONED_STRING(name, 0);
INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
   return res;
 }
 
 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
   ENSURE_MSAN_INITED();
   char *res = REAL(fgets_unlocked)(s, size, stream);
   if (res)
-    __msan_unpoison(s, REAL(strlen)(s) + 1);
+    __msan_unpoison(s, internal_strlen(s) + 1);
   return res;
 }
 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
 #else
 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
 #endif
 
 #define INTERCEPTOR_GETRLIMIT_BODY(func, resource, rlim)  \

 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
 #endif
 
 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
   ENSURE_MSAN_INITED();
   int res = REAL(gethostname)(name, len);
   if (!res || (res == -1 && errno == errno_ENAMETOOLONG)) {
-    SIZE_T real_len = REAL(strnlen)(name, len);
+    SIZE_T real_len = internal_strnlen(name, len);
     if (real_len < len)
       ++real_len;
     __msan_unpoison(name, real_len);
   }
   return res;
 }
 
 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD

 
 extern char *tzname[2];
 
 INTERCEPTOR(void, tzset, int fake) {
   ENSURE_MSAN_INITED();
   InterceptorScope interceptor_scope;
   REAL(tzset)(fake);
   if (tzname[0])
-    __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
+    __msan_unpoison(tzname[0], internal_strlen(tzname[0]) + 1);
   if (tzname[1])
-    __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
+    __msan_unpoison(tzname[1], internal_strlen(tzname[1]) + 1);
   return;
 }
 
 struct MSanAtExitRecord {
   void (*func)(void *arg);
   void *arg;
 };
 

 
 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
   int res = REAL(dladdr)(addr, info);
   if (res != 0) {
     __msan_unpoison(info, sizeof(*info));
     if (info->dli_fname)
-      __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
+      __msan_unpoison(info->dli_fname, internal_strlen(info->dli_fname) + 1);
     if (info->dli_sname)
-      __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
+      __msan_unpoison(info->dli_sname, internal_strlen(info->dli_sname) + 1);
   }
   return res;
 }
 
 INTERCEPTOR(char *, dlerror, int fake) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
   char *res = REAL(dlerror)(fake);
-  if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
+  if (res)
+    __msan_unpoison(res, internal_strlen(res) + 1);
   return res;
 }
 
 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
                                   void *data);
 struct dl_iterate_phdr_data {
   dl_iterate_phdr_cb callback;
   void *data;
 };
 
 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
                                    void *data) {
   if (info) {
     __msan_unpoison(info, size);
     if (info->dlpi_phdr && info->dlpi_phnum)
       __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
     if (info->dlpi_name)
-      __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
+      __msan_unpoison(info->dlpi_name, internal_strlen(info->dlpi_name) + 1);
   }
   dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
   UnpoisonParam(3);
   return cbdata->callback(info, size, cbdata->data);
 }
 
 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
   ENSURE_MSAN_INITED();
INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
   return res;
 }
 
 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   wchar_t *res = REAL(wcscpy)(dest, src);
-  CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
+  CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (internal_wcslen(src) + 1),
                       &stack);
   return res;
 }
 
 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
-  SIZE_T copy_size = REAL(wcsnlen)(src, n);
+  SIZE_T copy_size = internal_wcsnlen(src, n);
   if (copy_size < n) copy_size++;           // trailing \0
   wchar_t *res = REAL(wcsncpy)(dest, src, n);
   CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
   __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
   return res;
 }
 
 // These interface functions reside here so that they can use
void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
   GET_STORE_STACK_TRACE;
   void *res = REAL(memmove)(dest, src, n);
   MoveShadowAndOrigin(dest, src, n, &stack);
   return res;
 }
 
 void __msan_unpoison_string(const char* s) {
   if (!MEM_IS_APP(s)) return;
-  __msan_unpoison(s, REAL(strlen)(s) + 1);
+  __msan_unpoison(s, internal_strlen(s) + 1);
 }
 
 namespace __msan {
 
 void InitializeInterceptors() {
   static int inited = 0;
   CHECK_EQ(inited, 0);
 

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

 #endif
 
 #ifndef COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED
 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (0)
 #endif
 
 #define COMMON_INTERCEPTOR_READ_STRING(ctx, s, n)                   \
     COMMON_INTERCEPTOR_READ_RANGE((ctx), (s),                       \
-      common_flags()->strict_string_checks ? (REAL(strlen)(s)) + 1 : (n) )
+      common_flags()->strict_string_checks ? (internal_strlen(s)) + 1 : (n) )
 
 #ifndef COMMON_INTERCEPTOR_ON_DLOPEN
 #define COMMON_INTERCEPTOR_ON_DLOPEN(filename, flag) \
   CheckNoDeepBind(filename, flag);
 #endif
 
 #ifndef COMMON_INTERCEPTOR_GET_TLS_RANGE
 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) *begin = *end = 0;
enum {
     CIMT_FILE
   } type;
   union {
     FileMetadata file;
   };
 };
 
 #if SI_POSIX
 typedef AddrHashMap<CommonInterceptorMetadata, 31051> MetadataHashMap;
 
 static MetadataHashMap *interceptor_metadata_map;
 
 UNUSED static void SetInterceptorMetadata(__sanitizer_FILE *addr,
                                           const FileMetadata &file) {
   MetadataHashMap::Handle h(interceptor_metadata_map, (uptr)addr);
   CHECK(h.created());
   h->type = CommonInterceptorMetadata::CIMT_FILE;
   h->file = file;
 }
 
 UNUSED static const FileMetadata *GetInterceptorMetadata(
     __sanitizer_FILE *addr) {

 
 UNUSED static void DeleteInterceptorMetadata(void *addr) {
   MetadataHashMap::Handle h(interceptor_metadata_map, (uptr)addr, true);
   CHECK(h.exists());
 }
 #endif  // SI_POSIX
 
 #if SANITIZER_INTERCEPT_STRLEN
 INTERCEPTOR(SIZE_T, strlen, const char *s) {
   // Sometimes strlen is called prior to InitializeCommonInterceptors,
   // in which case the REAL(strlen) typically used in
   // COMMON_INTERCEPTOR_ENTER will fail.  We use internal_strlen here
   // to handle that.
   if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
     return internal_strlen(s);
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strlen, s);
   SIZE_T result = REAL(strlen)(s);
   if (common_flags()->intercept_strlen)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, s, result + 1);
   return result;
 }
 #define INIT_STRLEN COMMON_INTERCEPT_FUNCTION(strlen)
 #else
 #define INIT_STRLEN
 #endif
 
 #if SANITIZER_INTERCEPT_STRNLEN
 INTERCEPTOR(SIZE_T, strnlen, const char *s, SIZE_T maxlen) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strnlen, s, maxlen);
   SIZE_T length = REAL(strnlen)(s, maxlen);
   if (common_flags()->intercept_strlen)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, s, Min(length + 1, maxlen));
   return length;
 }
 #define INIT_STRNLEN COMMON_INTERCEPT_FUNCTION(strnlen)
 #else
 #define INIT_STRNLEN
 #endif
 
 #if SANITIZER_INTERCEPT_STRNDUP
 INTERCEPTOR(char*, strndup, const char *s, uptr size) {
   void *ctx;
   COMMON_INTERCEPTOR_STRNDUP_IMPL(ctx, s, size);
 }
 #define INIT_STRNDUP COMMON_INTERCEPT_FUNCTION(strndup)
 #else
 #define INIT_STRNDUP
 #endif // SANITIZER_INTERCEPT_STRNDUP
 

 
 #if SANITIZER_INTERCEPT_TEXTDOMAIN
 INTERCEPTOR(char*, textdomain, const char *domainname) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, textdomain, domainname);
   if (domainname) COMMON_INTERCEPTOR_READ_STRING(ctx, domainname, 0);
   char *domain = REAL(textdomain)(domainname);
   if (domain) {
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(domain, REAL(strlen)(domain) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(domain, internal_strlen(domain) + 1);
   }
   return domain;
 }
 #define INIT_TEXTDOMAIN COMMON_INTERCEPT_FUNCTION(textdomain)
 #else
 #define INIT_TEXTDOMAIN
 #endif
 

 #else
 #define INIT_STRCASECMP
 #define INIT_STRNCASECMP
 #endif
 
 #if SANITIZER_INTERCEPT_STRSTR || SANITIZER_INTERCEPT_STRCASESTR
 static inline void StrstrCheck(void *ctx, char *r, const char *s1,
                                const char *s2) {
-    uptr len1 = REAL(strlen)(s1);
-    uptr len2 = REAL(strlen)(s2);
+    uptr len1 = internal_strlen(s1);
+    uptr len2 = internal_strlen(s2);
     COMMON_INTERCEPTOR_READ_STRING(ctx, s1, r ? r - s1 + len2 : len1 + 1);
     COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, len2 + 1);
 }
 #endif
 
 #if SANITIZER_INTERCEPT_STRSTR
 
 DECLARE_WEAK_INTERCEPTOR_HOOK(__sanitizer_weak_hook_strstr, uptr called_pc,
if (!common_flags()->intercept_strtok) {
     return REAL(strtok)(str, delimiters);
   }
   if (common_flags()->strict_string_checks) {
     // If strict_string_checks is enabled, we check the whole first argument
     // string on the first call (strtok saves this string in a static buffer
     // for subsequent calls). We do not need to check strtok's result.
     // As the delimiters can change, we check them every call.
     if (str != nullptr) {
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, str, REAL(strlen)(str) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, str, internal_strlen(str) + 1);
     }
     COMMON_INTERCEPTOR_READ_RANGE(ctx, delimiters,
-                                  REAL(strlen)(delimiters) + 1);
+                                  internal_strlen(delimiters) + 1);
     return REAL(strtok)(str, delimiters);
   } else {
     // However, when strict_string_checks is disabled we cannot check the
     // whole string on the first call. Instead, we check the result string
     // which is guaranteed to be a NULL-terminated substring of the first
     // argument. We also conservatively check one character of str and the
     // delimiters.
     if (str != nullptr) {
       COMMON_INTERCEPTOR_READ_STRING(ctx, str, 1);
     }
     COMMON_INTERCEPTOR_READ_RANGE(ctx, delimiters, 1);
     char *result = REAL(strtok)(str, delimiters);
     if (result != nullptr) {
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, result, REAL(strlen)(result) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, result, internal_strlen(result) + 1);
     } else if (str != nullptr) {
       // No delimiter were found, it's safe to assume that the entire str was
       // scanned.
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, str, REAL(strlen)(str) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, str, internal_strlen(str) + 1);
     }
     return result;
   }
 }
 
 #define INIT_STRTOK COMMON_INTERCEPT_FUNCTION(strtok)
 #else
 #define INIT_STRTOK
INTERCEPTOR(char*, strchr, const char *s, int c) {
   void *ctx;
   if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
     return internal_strchr(s, c);
   COMMON_INTERCEPTOR_ENTER(ctx, strchr, s, c);
   char *result = REAL(strchr)(s, c);
   if (common_flags()->intercept_strchr) {
     // Keep strlen as macro argument, as macro may ignore it.
     COMMON_INTERCEPTOR_READ_STRING(ctx, s,
-      (result ? result - s : REAL(strlen)(s)) + 1);
+      (result ? result - s : internal_strlen(s)) + 1);
   }
   return result;
 }
 #define INIT_STRCHR COMMON_INTERCEPT_FUNCTION(strchr)
 #else
 #define INIT_STRCHR
 #endif
 

 
 #if SANITIZER_INTERCEPT_STRRCHR
 INTERCEPTOR(char*, strrchr, const char *s, int c) {
   void *ctx;
   if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
     return internal_strrchr(s, c);
   COMMON_INTERCEPTOR_ENTER(ctx, strrchr, s, c);
   if (common_flags()->intercept_strchr)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, REAL(strlen)(s) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, internal_strlen(s) + 1);
   return REAL(strrchr)(s, c);
 }
 #define INIT_STRRCHR COMMON_INTERCEPT_FUNCTION(strrchr)
 #else
 #define INIT_STRRCHR
 #endif
 
 #if SANITIZER_INTERCEPT_STRSPN
 INTERCEPTOR(SIZE_T, strspn, const char *s1, const char *s2) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strspn, s1, s2);
   SIZE_T r = REAL(strspn)(s1, s2);
   if (common_flags()->intercept_strspn) {
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, REAL(strlen)(s2) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, internal_strlen(s2) + 1);
     COMMON_INTERCEPTOR_READ_STRING(ctx, s1, r + 1);
   }
   return r;
 }
 
 INTERCEPTOR(SIZE_T, strcspn, const char *s1, const char *s2) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strcspn, s1, s2);
   SIZE_T r = REAL(strcspn)(s1, s2);
   if (common_flags()->intercept_strspn) {
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, REAL(strlen)(s2) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, internal_strlen(s2) + 1);
     COMMON_INTERCEPTOR_READ_STRING(ctx, s1, r + 1);
   }
   return r;
 }
 
 #define INIT_STRSPN \
   COMMON_INTERCEPT_FUNCTION(strspn); \
   COMMON_INTERCEPT_FUNCTION(strcspn);
 #else
 #define INIT_STRSPN
 #endif
 
 #if SANITIZER_INTERCEPT_STRPBRK
 INTERCEPTOR(char *, strpbrk, const char *s1, const char *s2) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strpbrk, s1, s2);
   char *r = REAL(strpbrk)(s1, s2);
   if (common_flags()->intercept_strpbrk) {
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, REAL(strlen)(s2) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, s2, internal_strlen(s2) + 1);
     COMMON_INTERCEPTOR_READ_STRING(ctx, s1,
-        r ? r - s1 + 1 : REAL(strlen)(s1) + 1);
+        r ? r - s1 + 1 : internal_strlen(s1) + 1);
   }
   return r;
 }
 
 #define INIT_STRPBRK COMMON_INTERCEPT_FUNCTION(strpbrk);
 #else
 #define INIT_STRPBRK
 #endif
INTERCEPTOR(char *, fgets, char *s, SIZE_T size, void *file) {
   // libc file streams can call user-supplied functions, see fopencookie.
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fgets, s, size, file);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(fgets)(s, size, file);
   if (res)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, s, REAL(strlen)(s) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, s, internal_strlen(s) + 1);
   return res;
 }
 #define INIT_FGETS COMMON_INTERCEPT_FUNCTION(fgets)
 #else
 #define INIT_FGETS
 #endif
 
 #if SANITIZER_INTERCEPT_FPUTS
 INTERCEPTOR_WITH_SUFFIX(int, fputs, char *s, void *file) {
   // libc file streams can call user-supplied functions, see fopencookie.
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fputs, s, file);
   if (!SANITIZER_MAC || s) {  // `fputs(NULL, file)` is supported on Darwin.
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, REAL(strlen)(s) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, internal_strlen(s) + 1);
   }
   return REAL(fputs)(s, file);
 }
 #define INIT_FPUTS COMMON_INTERCEPT_FUNCTION(fputs)
 #else
 #define INIT_FPUTS
 #endif
 
 #if SANITIZER_INTERCEPT_PUTS
 INTERCEPTOR(int, puts, char *s) {
   // libc file streams can call user-supplied functions, see fopencookie.
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, puts, s);
   if (!SANITIZER_MAC || s) {  // `puts(NULL)` is supported on Darwin.
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, REAL(strlen)(s) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, internal_strlen(s) + 1);
   }
   return REAL(puts)(s);
 }
 #define INIT_PUTS COMMON_INTERCEPT_FUNCTION(puts)
 #else
 #define INIT_PUTS
 #endif
 
INTERCEPTOR(char *, ctime, unsigned long *timep) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ctime, timep);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(ctime)(timep);
   if (res) {
     COMMON_INTERCEPTOR_READ_RANGE(ctx, timep, sizeof(*timep));
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   }
   return res;
 }
 INTERCEPTOR(char *, ctime_r, unsigned long *timep, char *result) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ctime_r, timep, result);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(ctime_r)(timep, result);
   if (res) {
     COMMON_INTERCEPTOR_READ_RANGE(ctx, timep, sizeof(*timep));
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   }
   return res;
 }
 INTERCEPTOR(char *, asctime, __sanitizer_tm *tm) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, asctime, tm);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(asctime)(tm);
   if (res) {
     COMMON_INTERCEPTOR_READ_RANGE(ctx, tm, sizeof(*tm));
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   }
   return res;
 }
 INTERCEPTOR(char *, asctime_r, __sanitizer_tm *tm, char *result) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, asctime_r, tm, result);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(asctime_r)(tm, result);
   if (res) {
     COMMON_INTERCEPTOR_READ_RANGE(ctx, tm, sizeof(*tm));
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   }
   return res;
 }
 INTERCEPTOR(long, mktime, __sanitizer_tm *tm) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, mktime, tm);
   COMMON_INTERCEPTOR_READ_RANGE(ctx, &tm->tm_sec, sizeof(tm->tm_sec));
   COMMON_INTERCEPTOR_READ_RANGE(ctx, &tm->tm_min, sizeof(tm->tm_min));

 #define INIT_LOCALTIME_AND_FRIENDS
 #endif  // SANITIZER_INTERCEPT_LOCALTIME_AND_FRIENDS
 
 #if SANITIZER_INTERCEPT_STRPTIME
 INTERCEPTOR(char *, strptime, char *s, char *format, __sanitizer_tm *tm) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strptime, s, format, tm);
   if (format)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, format, REAL(strlen)(format) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, format, internal_strlen(format) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(strptime)(s, format, tm);
   COMMON_INTERCEPTOR_READ_STRING(ctx, s, res ? res - s : 0);
   if (res && tm) {
     // Do not call unpoison_tm here, because strptime does not, in fact,
     // initialize the entire struct tm. For example, tm_zone pointer is left

 #endif
 
 #if SANITIZER_POSIX
 UNUSED static void unpoison_passwd(void *ctx, __sanitizer_passwd *pwd) {
   if (pwd) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd, sizeof(*pwd));
     if (pwd->pw_name)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd->pw_name,
-                                     REAL(strlen)(pwd->pw_name) + 1);
+                                     internal_strlen(pwd->pw_name) + 1);
     if (pwd->pw_passwd)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd->pw_passwd,
-                                     REAL(strlen)(pwd->pw_passwd) + 1);
+                                     internal_strlen(pwd->pw_passwd) + 1);
 #if !SANITIZER_ANDROID
     if (pwd->pw_gecos)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd->pw_gecos,
-                                     REAL(strlen)(pwd->pw_gecos) + 1);
+                                     internal_strlen(pwd->pw_gecos) + 1);
 #endif
 #if SANITIZER_MAC || SANITIZER_FREEBSD || SANITIZER_NETBSD
     if (pwd->pw_class)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd->pw_class,
-                                     REAL(strlen)(pwd->pw_class) + 1);
+                                     internal_strlen(pwd->pw_class) + 1);
 #endif
     if (pwd->pw_dir)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd->pw_dir,
-                                     REAL(strlen)(pwd->pw_dir) + 1);
+                                     internal_strlen(pwd->pw_dir) + 1);
     if (pwd->pw_shell)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pwd->pw_shell,
-                                     REAL(strlen)(pwd->pw_shell) + 1);
+                                     internal_strlen(pwd->pw_shell) + 1);
   }
 }
 
 UNUSED static void unpoison_group(void *ctx, __sanitizer_group *grp) {
   if (grp) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, grp, sizeof(*grp));
     if (grp->gr_name)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, grp->gr_name,
-                                     REAL(strlen)(grp->gr_name) + 1);
+                                     internal_strlen(grp->gr_name) + 1);
     if (grp->gr_passwd)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, grp->gr_passwd,
-                                     REAL(strlen)(grp->gr_passwd) + 1);
+                                     internal_strlen(grp->gr_passwd) + 1);
     char **p = grp->gr_mem;
     for (; *p; ++p) {
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, REAL(strlen)(*p) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, internal_strlen(*p) + 1);
     }
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, grp->gr_mem,
                                    (p - grp->gr_mem + 1) * sizeof(*p));
   }
 }
 #endif  // SANITIZER_POSIX
 
 #if SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
 INTERCEPTOR(__sanitizer_passwd *, getpwnam, const char *name) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getpwnam, name);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   __sanitizer_passwd *res = REAL(getpwnam)(name);
   unpoison_passwd(ctx, res);
   return res;
 }
 INTERCEPTOR(__sanitizer_passwd *, getpwuid, u32 uid) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getpwuid, uid);
   __sanitizer_passwd *res = REAL(getpwuid)(uid);
   unpoison_passwd(ctx, res);
   return res;
 }
 INTERCEPTOR(__sanitizer_group *, getgrnam, const char *name) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getgrnam, name);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   __sanitizer_group *res = REAL(getgrnam)(name);
   unpoison_group(ctx, res);
   return res;
 }
 INTERCEPTOR(__sanitizer_group *, getgrgid, u32 gid) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getgrgid, gid);
   __sanitizer_group *res = REAL(getgrgid)(gid);

 #define INIT_GETPWNAM_AND_FRIENDS
 #endif
 
 #if SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
 INTERCEPTOR(int, getpwnam_r, const char *name, __sanitizer_passwd *pwd,
             char *buf, SIZE_T buflen, __sanitizer_passwd **result) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getpwnam_r, name, pwd, buf, buflen, result);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(getpwnam_r)(name, pwd, buf, buflen, result);
   if (!res && result)
     unpoison_passwd(ctx, *result);
   if (result) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, result, sizeof(*result));
   return res;
if (!res && result)
     unpoison_passwd(ctx, *result);
   if (result) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, result, sizeof(*result));
   return res;
 }
 INTERCEPTOR(int, getgrnam_r, const char *name, __sanitizer_group *grp,
             char *buf, SIZE_T buflen, __sanitizer_group **result) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getgrnam_r, name, grp, buf, buflen, result);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(getgrnam_r)(name, grp, buf, buflen, result);
   if (!res && result)
     unpoison_group(ctx, *result);
   if (result) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, result, sizeof(*result));
   return res;

 static void unpoison_glob_t(void *ctx, __sanitizer_glob_t *pglob) {
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pglob, sizeof(*pglob));
   // +1 for NULL pointer at the end.
   if (pglob->gl_pathv)
     COMMON_INTERCEPTOR_WRITE_RANGE(
         ctx, pglob->gl_pathv, (pglob->gl_pathc + 1) * sizeof(*pglob->gl_pathv));
   for (SIZE_T i = 0; i < pglob->gl_pathc; ++i) {
     char *p = pglob->gl_pathv[i];
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, REAL(strlen)(p) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, internal_strlen(p) + 1);
   }
 }
 
 #if SANITIZER_SOLARIS
 INTERCEPTOR(int, glob, const char *pattern, int flags,
             int (*errfunc)(const char *epath, int eerrno),
             __sanitizer_glob_t *pglob) {
   void *ctx;

 
 static void *wrapped_gl_readdir(void *dir) {
   COMMON_INTERCEPTOR_UNPOISON_PARAM(1);
   return pglob_copy->gl_readdir(dir);
 }
 
 static void *wrapped_gl_opendir(const char *s) {
   COMMON_INTERCEPTOR_UNPOISON_PARAM(1);
-  COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, REAL(strlen)(s) + 1);
+  COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, internal_strlen(s) + 1);
   return pglob_copy->gl_opendir(s);
 }
 
 static int wrapped_gl_lstat(const char *s, void *st) {
   COMMON_INTERCEPTOR_UNPOISON_PARAM(2);
-  COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, REAL(strlen)(s) + 1);
+  COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, internal_strlen(s) + 1);
   return pglob_copy->gl_lstat(s, st);
 }
 
 static int wrapped_gl_stat(const char *s, void *st) {
   COMMON_INTERCEPTOR_UNPOISON_PARAM(2);
-  COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, REAL(strlen)(s) + 1);
+  COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, internal_strlen(s) + 1);
   return pglob_copy->gl_stat(s, st);
 }
 
 static const __sanitizer_glob_t kGlobCopy = {
       0,                  0,                   0,
       0,                  wrapped_gl_closedir, wrapped_gl_readdir,
       wrapped_gl_opendir, wrapped_gl_lstat,    wrapped_gl_stat};
 
INTERCEPTOR(char *, inet_ntop, int af, const void *src, char *dst, u32 size) {
   COMMON_INTERCEPTOR_ENTER(ctx, inet_ntop, af, src, dst, size);
   uptr sz = __sanitizer_in_addr_sz(af);
   if (sz) COMMON_INTERCEPTOR_READ_RANGE(ctx, src, sz);
   // FIXME: figure out read size based on the address family.
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(inet_ntop)(af, src, dst, size);
-  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 INTERCEPTOR(int, inet_pton, int af, const char *src, void *dst) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, inet_pton, af, src, dst);
   COMMON_INTERCEPTOR_READ_STRING(ctx, src, 0);
   // FIXME: figure out read size based on the address family.
   // FIXME: under ASan the call below may write to freed memory and corrupt

 #else
 #define INIT_INET
 #endif
 
 #if SANITIZER_INTERCEPT_INET
 INTERCEPTOR(int, inet_aton, const char *cp, void *dst) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, inet_aton, cp, dst);
-  if (cp) COMMON_INTERCEPTOR_READ_RANGE(ctx, cp, REAL(strlen)(cp) + 1);
+  if (cp) COMMON_INTERCEPTOR_READ_RANGE(ctx, cp, internal_strlen(cp) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(inet_aton)(cp, dst);
   if (res != 0) {
     uptr sz = __sanitizer_in_addr_sz(af_inet);
     if (sz) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, sz);
   }

 #endif
 
 #if SANITIZER_INTERCEPT_GETADDRINFO
 INTERCEPTOR(int, getaddrinfo, char *node, char *service,
             struct __sanitizer_addrinfo *hints,
             struct __sanitizer_addrinfo **out) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getaddrinfo, node, service, hints, out);
-  if (node) COMMON_INTERCEPTOR_READ_RANGE(ctx, node, REAL(strlen)(node) + 1);
+  if (node) COMMON_INTERCEPTOR_READ_RANGE(ctx, node, internal_strlen(node) + 1);
   if (service)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, service, REAL(strlen)(service) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, service, internal_strlen(service) + 1);
   if (hints)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, hints, sizeof(__sanitizer_addrinfo));
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(getaddrinfo)(node, service, hints, out);
   if (res == 0 && out) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, out, sizeof(*out));
     struct __sanitizer_addrinfo *p = *out;
     while (p) {
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, sizeof(*p));
       if (p->ai_addr)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->ai_addr, p->ai_addrlen);
       if (p->ai_canonname)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->ai_canonname,
-                                       REAL(strlen)(p->ai_canonname) + 1);
+                                       internal_strlen(p->ai_canonname) + 1);
       p = p->ai_next;
     }
   }
   return res;
 }
 #define INIT_GETADDRINFO COMMON_INTERCEPT_FUNCTION(getaddrinfo);
 #else
 #define INIT_GETADDRINFO
INTERCEPTOR(int, getnameinfo, void *sockaddr, unsigned salen, char *host,
   // There is padding in in_addr that may make this too noisy
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res =
       REAL(getnameinfo)(sockaddr, salen, host, hostlen, serv, servlen, flags);
   if (res == 0) {
     if (host && hostlen)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, host, REAL(strlen)(host) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, host, internal_strlen(host) + 1);
     if (serv && servlen)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, serv, REAL(strlen)(serv) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, serv, internal_strlen(serv) + 1);
   }
   return res;
 }
 #define INIT_GETNAMEINFO COMMON_INTERCEPT_FUNCTION(getnameinfo);
 #else
 #define INIT_GETNAMEINFO
 #endif
 

 #else
 #define INIT_GETSOCKNAME
 #endif
 
 #if SANITIZER_INTERCEPT_GETHOSTBYNAME || SANITIZER_INTERCEPT_GETHOSTBYNAME_R
 static void write_hostent(void *ctx, struct __sanitizer_hostent *h) {
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, h, sizeof(__sanitizer_hostent));
   if (h->h_name)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, h->h_name, REAL(strlen)(h->h_name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, h->h_name, internal_strlen(h->h_name) + 1);
   char **p = h->h_aliases;
   while (*p) {
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, REAL(strlen)(*p) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, internal_strlen(*p) + 1);
     ++p;
   }
   COMMON_INTERCEPTOR_WRITE_RANGE(
       ctx, h->h_aliases, (p - h->h_aliases + 1) * sizeof(*h->h_aliases));
   p = h->h_addr_list;
   while (*p) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, h->h_length);
     ++p;

 #else
 #define INIT_SYSINFO
 #endif
 
 #if SANITIZER_INTERCEPT_READDIR
 INTERCEPTOR(__sanitizer_dirent *, opendir, const char *path) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, opendir, path);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   __sanitizer_dirent *res = REAL(opendir)(path);
   if (res)
     COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path);
   return res;
 }
 
 INTERCEPTOR(__sanitizer_dirent *, readdir, void *dirp) {
   void *ctx;
#if SANITIZER_NETBSD
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, _tolower_tab_, 257 * sizeof(short));
 #endif
 }
 
 INTERCEPTOR(char *, setlocale, int category, char *locale) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, setlocale, category, locale);
   if (locale)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, locale, REAL(strlen)(locale) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, locale, internal_strlen(locale) + 1);
   char *res = REAL(setlocale)(category, locale);
   if (res) {
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
     unpoison_ctype_arrays(ctx);
   }
   return res;
 }
 
 #define INIT_SETLOCALE COMMON_INTERCEPT_FUNCTION(setlocale);
 #else
 #define INIT_SETLOCALE
 #endif
 
 #if SANITIZER_INTERCEPT_GETCWD
 INTERCEPTOR(char *, getcwd, char *buf, SIZE_T size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getcwd, buf, size);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(getcwd)(buf, size);
-  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_GETCWD COMMON_INTERCEPT_FUNCTION(getcwd);
 #else
 #define INIT_GETCWD
 #endif
 
 #if SANITIZER_INTERCEPT_GET_CURRENT_DIR_NAME
 INTERCEPTOR(char *, get_current_dir_name, int fake) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, get_current_dir_name, fake);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(get_current_dir_name)(fake);
-  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 
 #define INIT_GET_CURRENT_DIR_NAME \
   COMMON_INTERCEPT_FUNCTION(get_current_dir_name);
 #else
 #define INIT_GET_CURRENT_DIR_NAME
 #endif

 #else
 #define INIT_TCGETATTR
 #endif
 
 #if SANITIZER_INTERCEPT_REALPATH
 INTERCEPTOR(char *, realpath, const char *path, char *resolved_path) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, realpath, path, resolved_path);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   char *res = REAL(realpath)(path, resolved_path);
-  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_REALPATH COMMON_INTERCEPT_FUNCTION_GLIBC_VER_MIN(realpath, "GLIBC_2.3");
 #else
 #define INIT_REALPATH
 #endif
 
 #if SANITIZER_INTERCEPT_CANONICALIZE_FILE_NAME
 INTERCEPTOR(char *, canonicalize_file_name, const char *path) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, canonicalize_file_name, path);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   char *res = REAL(canonicalize_file_name)(path);
-  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_CANONICALIZE_FILE_NAME \
   COMMON_INTERCEPT_FUNCTION(canonicalize_file_name);
 #else
 #define INIT_CANONICALIZE_FILE_NAME
 #endif
 

 #endif
 
 #if SANITIZER_INTERCEPT_STRERROR
 INTERCEPTOR(char *, strerror, int errnum) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strerror, errnum);
   COMMON_INTERCEPTOR_STRERROR();
   char *res = REAL(strerror)(errnum);
-  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_STRERROR COMMON_INTERCEPT_FUNCTION(strerror);
 #else
 #define INIT_STRERROR
 #endif
 
 #if SANITIZER_INTERCEPT_STRERROR_R

 INTERCEPTOR(char *, strerror_r, int errnum, char *buf, SIZE_T buflen) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strerror_r, errnum, buf, buflen);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(strerror_r)(errnum, buf, buflen);
   if (res == buf)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   else
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   return res;
 }
 #endif //(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE ||
        //SANITIZER_MAC
 #define INIT_STRERROR_R COMMON_INTERCEPT_FUNCTION(strerror_r);
 #else
 #define INIT_STRERROR_R
 #endif
 
 #if SANITIZER_INTERCEPT_XPG_STRERROR_R
 INTERCEPTOR(int, __xpg_strerror_r, int errnum, char *buf, SIZE_T buflen) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, __xpg_strerror_r, errnum, buf, buflen);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(__xpg_strerror_r)(errnum, buf, buflen);
   // This version always returns a null-terminated string.
   if (buf && buflen)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, REAL(strlen)(buf) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, internal_strlen(buf) + 1);
   return res;
 }
 #define INIT_XPG_STRERROR_R COMMON_INTERCEPT_FUNCTION(__xpg_strerror_r);
 #else
 #define INIT_XPG_STRERROR_R
 #endif
 
 #if SANITIZER_INTERCEPT_SCANDIR
static int wrapped_scandir_compar(const struct __sanitizer_dirent **a,
   COMMON_INTERCEPTOR_INITIALIZE_RANGE(*b, (*b)->d_reclen);
   return scandir_compar(a, b);
 }
 
 INTERCEPTOR(int, scandir, char *dirp, __sanitizer_dirent ***namelist,
             scandir_filter_f filter, scandir_compar_f compar) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, scandir, dirp, namelist, filter, compar);
-  if (dirp) COMMON_INTERCEPTOR_READ_RANGE(ctx, dirp, REAL(strlen)(dirp) + 1);
+  if (dirp) COMMON_INTERCEPTOR_READ_RANGE(ctx, dirp, internal_strlen(dirp) + 1);
   scandir_filter = filter;
   scandir_compar = compar;
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(scandir)(dirp, namelist,
                           filter ? wrapped_scandir_filter : nullptr,
                           compar ? wrapped_scandir_compar : nullptr);
static int wrapped_scandir64_compar(const struct __sanitizer_dirent64 **a,
   COMMON_INTERCEPTOR_INITIALIZE_RANGE(*b, (*b)->d_reclen);
   return scandir64_compar(a, b);
 }
 
 INTERCEPTOR(int, scandir64, char *dirp, __sanitizer_dirent64 ***namelist,
             scandir64_filter_f filter, scandir64_compar_f compar) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, scandir64, dirp, namelist, filter, compar);
-  if (dirp) COMMON_INTERCEPTOR_READ_RANGE(ctx, dirp, REAL(strlen)(dirp) + 1);
+  if (dirp) COMMON_INTERCEPTOR_READ_RANGE(ctx, dirp, internal_strlen(dirp) + 1);
   scandir64_filter = filter;
   scandir64_compar = compar;
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res =
       REAL(scandir64)(dirp, namelist,
                       filter ? wrapped_scandir64_filter : nullptr,

 #else
 #define INIT_PPOLL
 #endif
 
 #if SANITIZER_INTERCEPT_WORDEXP
 INTERCEPTOR(int, wordexp, char *s, __sanitizer_wordexp_t *p, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, wordexp, s, p, flags);
-  if (s) COMMON_INTERCEPTOR_READ_RANGE(ctx, s, REAL(strlen)(s) + 1);
+  if (s) COMMON_INTERCEPTOR_READ_RANGE(ctx, s, internal_strlen(s) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(wordexp)(s, p, flags);
   if (!res && p) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, sizeof(*p));
     if (p->we_wordc)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->we_wordv,
                                      sizeof(*p->we_wordv) * p->we_wordc);
     for (uptr i = 0; i < p->we_wordc; ++i) {
       char *w = p->we_wordv[i];
-      if (w) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, w, REAL(strlen)(w) + 1);
+      if (w) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, w, internal_strlen(w) + 1);
     }
   }
   return res;
 }
 #define INIT_WORDEXP COMMON_INTERCEPT_FUNCTION(wordexp);
 #else
 #define INIT_WORDEXP
 #endif

 #define INIT___LIBC_THR_SETCANCELSTATE
 #endif
 
 #if SANITIZER_INTERCEPT_GETMNTENT || SANITIZER_INTERCEPT_GETMNTENT_R
 static void write_mntent(void *ctx, __sanitizer_mntent *mnt) {
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, mnt, sizeof(*mnt));
   if (mnt->mnt_fsname)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, mnt->mnt_fsname,
-                                   REAL(strlen)(mnt->mnt_fsname) + 1);
+                                   internal_strlen(mnt->mnt_fsname) + 1);
   if (mnt->mnt_dir)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, mnt->mnt_dir,
-                                   REAL(strlen)(mnt->mnt_dir) + 1);
+                                   internal_strlen(mnt->mnt_dir) + 1);
   if (mnt->mnt_type)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, mnt->mnt_type,
-                                   REAL(strlen)(mnt->mnt_type) + 1);
+                                   internal_strlen(mnt->mnt_type) + 1);
   if (mnt->mnt_opts)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, mnt->mnt_opts,
-                                   REAL(strlen)(mnt->mnt_opts) + 1);
+                                   internal_strlen(mnt->mnt_opts) + 1);
 }
 #endif
 
 #if SANITIZER_INTERCEPT_GETMNTENT
 INTERCEPTOR(__sanitizer_mntent *, getmntent, void *fp) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getmntent, fp);
   __sanitizer_mntent *res = REAL(getmntent)(fp);

 #else
 #define INIT_GETMNTENT_R
 #endif
 
 #if SANITIZER_INTERCEPT_STATFS
 INTERCEPTOR(int, statfs, char *path, void *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statfs, path, buf);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(statfs)(path, buf);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statfs_sz);
   return res;
 }
 INTERCEPTOR(int, fstatfs, int fd, void *buf) {

 #else
 #define INIT_STATFS
 #endif
 
 #if SANITIZER_INTERCEPT_STATFS64
 INTERCEPTOR(int, statfs64, char *path, void *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statfs64, path, buf);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(statfs64)(path, buf);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statfs64_sz);
   return res;
 }
 INTERCEPTOR(int, fstatfs64, int fd, void *buf) {

 #else
 #define INIT_STATFS64
 #endif
 
 #if SANITIZER_INTERCEPT_STATVFS
 INTERCEPTOR(int, statvfs, char *path, void *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statvfs, path, buf);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(statvfs)(path, buf);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statvfs_sz);
   return res;
 }
 INTERCEPTOR(int, fstatvfs, int fd, void *buf) {

 #else
 #define INIT_STATVFS
 #endif
 
 #if SANITIZER_INTERCEPT_STATVFS64
 INTERCEPTOR(int, statvfs64, char *path, void *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statvfs64, path, buf);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(statvfs64)(path, buf);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statvfs64_sz);
   return res;
 }
 INTERCEPTOR(int, fstatvfs64, int fd, void *buf) {

 #else
 #define INIT_STATVFS64
 #endif
 
 #if SANITIZER_INTERCEPT_INITGROUPS
 INTERCEPTOR(int, initgroups, char *user, u32 group) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, initgroups, user, group);
-  if (user) COMMON_INTERCEPTOR_READ_RANGE(ctx, user, REAL(strlen)(user) + 1);
+  if (user) COMMON_INTERCEPTOR_READ_RANGE(ctx, user, internal_strlen(user) + 1);
   int res = REAL(initgroups)(user, group);
   return res;
 }
 #define INIT_INITGROUPS COMMON_INTERCEPT_FUNCTION(initgroups);
 #else
 #define INIT_INITGROUPS
 #endif
 
 #if SANITIZER_INTERCEPT_ETHER_NTOA_ATON
 INTERCEPTOR(char *, ether_ntoa, __sanitizer_ether_addr *addr) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_ntoa, addr);
   if (addr) COMMON_INTERCEPTOR_READ_RANGE(ctx, addr, sizeof(*addr));
   char *res = REAL(ether_ntoa)(addr);
-  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   return res;
 }
 INTERCEPTOR(__sanitizer_ether_addr *, ether_aton, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_aton, buf);
-  if (buf) COMMON_INTERCEPTOR_READ_RANGE(ctx, buf, REAL(strlen)(buf) + 1);
+  if (buf) COMMON_INTERCEPTOR_READ_RANGE(ctx, buf, internal_strlen(buf) + 1);
   __sanitizer_ether_addr *res = REAL(ether_aton)(buf);
   if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, sizeof(*res));
   return res;
 }
 #define INIT_ETHER_NTOA_ATON             \
   COMMON_INTERCEPT_FUNCTION(ether_ntoa); \
   COMMON_INTERCEPT_FUNCTION(ether_aton);
 #else
 #define INIT_ETHER_NTOA_ATON
 #endif
 
 #if SANITIZER_INTERCEPT_ETHER_HOST
 INTERCEPTOR(int, ether_ntohost, char *hostname, __sanitizer_ether_addr *addr) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_ntohost, hostname, addr);
   if (addr) COMMON_INTERCEPTOR_READ_RANGE(ctx, addr, sizeof(*addr));
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(ether_ntohost)(hostname, addr);
   if (!res && hostname)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, hostname, REAL(strlen)(hostname) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, hostname, internal_strlen(hostname) + 1);
   return res;
 }
 INTERCEPTOR(int, ether_hostton, char *hostname, __sanitizer_ether_addr *addr) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_hostton, hostname, addr);
   if (hostname)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, hostname, REAL(strlen)(hostname) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, hostname, internal_strlen(hostname) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(ether_hostton)(hostname, addr);
   if (!res && addr) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, addr, sizeof(*addr));
   return res;
 }
 INTERCEPTOR(int, ether_line, char *line, __sanitizer_ether_addr *addr,
             char *hostname) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_line, line, addr, hostname);
-  if (line) COMMON_INTERCEPTOR_READ_RANGE(ctx, line, REAL(strlen)(line) + 1);
+  if (line) COMMON_INTERCEPTOR_READ_RANGE(ctx, line, internal_strlen(line) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(ether_line)(line, addr, hostname);
   if (!res) {
     if (addr) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, addr, sizeof(*addr));
     if (hostname)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, hostname, REAL(strlen)(hostname) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, hostname, internal_strlen(hostname) + 1);
   }
   return res;
 }
 #define INIT_ETHER_HOST                     \
   COMMON_INTERCEPT_FUNCTION(ether_ntohost); \
   COMMON_INTERCEPT_FUNCTION(ether_hostton); \
   COMMON_INTERCEPT_FUNCTION(ether_line);
 #else
 #define INIT_ETHER_HOST
 #endif
 
 #if SANITIZER_INTERCEPT_ETHER_R
 INTERCEPTOR(char *, ether_ntoa_r, __sanitizer_ether_addr *addr, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_ntoa_r, addr, buf);
   if (addr) COMMON_INTERCEPTOR_READ_RANGE(ctx, addr, sizeof(*addr));
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(ether_ntoa_r)(addr, buf);
-  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 INTERCEPTOR(__sanitizer_ether_addr *, ether_aton_r, char *buf,
             __sanitizer_ether_addr *addr) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ether_aton_r, buf, addr);
-  if (buf) COMMON_INTERCEPTOR_READ_RANGE(ctx, buf, REAL(strlen)(buf) + 1);
+  if (buf) COMMON_INTERCEPTOR_READ_RANGE(ctx, buf, internal_strlen(buf) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   __sanitizer_ether_addr *res = REAL(ether_aton_r)(buf, addr);
   if (res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, sizeof(*res));
   return res;
 }
 #define INIT_ETHER_R                       \
INTERCEPTOR(char *, tmpnam, char *s) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, tmpnam, s);
   char *res = REAL(tmpnam)(s);
   if (res) {
     if (s)
       // FIXME: under ASan the call below may write to freed memory and corrupt
       // its metadata. See
       // https://github.com/google/sanitizers/issues/321.
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, s, REAL(strlen)(s) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, s, internal_strlen(s) + 1);
     else
-      COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+      COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   }
   return res;
 }
 #define INIT_TMPNAM COMMON_INTERCEPT_FUNCTION(tmpnam);
 #else
 #define INIT_TMPNAM
 #endif
 
 #if SANITIZER_INTERCEPT_TMPNAM_R
 INTERCEPTOR(char *, tmpnam_r, char *s) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, tmpnam_r, s);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(tmpnam_r)(s);
-  if (res && s) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, s, REAL(strlen)(s) + 1);
+  if (res && s) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, s, internal_strlen(s) + 1);
   return res;
 }
 #define INIT_TMPNAM_R COMMON_INTERCEPT_FUNCTION(tmpnam_r);
 #else
 #define INIT_TMPNAM_R
 #endif
 
 #if SANITIZER_INTERCEPT_PTSNAME
 INTERCEPTOR(char *, ptsname, int fd) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ptsname, fd);
   char *res = REAL(ptsname)(fd);
   if (res != nullptr)
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_PTSNAME COMMON_INTERCEPT_FUNCTION(ptsname);
 #else
 #define INIT_PTSNAME
 #endif
 
 #if SANITIZER_INTERCEPT_PTSNAME_R
 INTERCEPTOR(int, ptsname_r, int fd, char *name, SIZE_T namesize) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ptsname_r, fd, name, namesize);
   int res = REAL(ptsname_r)(fd, name, namesize);
   if (res == 0)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, internal_strlen(name) + 1);
   return res;
 }
 #define INIT_PTSNAME_R COMMON_INTERCEPT_FUNCTION(ptsname_r);
 #else
 #define INIT_PTSNAME_R
 #endif
 
 #if SANITIZER_INTERCEPT_TTYNAME
 INTERCEPTOR(char *, ttyname, int fd) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ttyname, fd);
   char *res = REAL(ttyname)(fd);
   if (res != nullptr)
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_TTYNAME COMMON_INTERCEPT_FUNCTION(ttyname);
 #else
 #define INIT_TTYNAME
 #endif
 
 #if SANITIZER_INTERCEPT_TTYNAME_R
 INTERCEPTOR(int, ttyname_r, int fd, char *name, SIZE_T namesize) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ttyname_r, fd, name, namesize);
   int res = REAL(ttyname_r)(fd, name, namesize);
   if (res == 0)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, internal_strlen(name) + 1);
   return res;
 }
 #define INIT_TTYNAME_R COMMON_INTERCEPT_FUNCTION(ttyname_r);
 #else
 #define INIT_TTYNAME_R
 #endif
 
 #if SANITIZER_INTERCEPT_TEMPNAM
 INTERCEPTOR(char *, tempnam, char *dir, char *pfx) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, tempnam, dir, pfx);
-  if (dir) COMMON_INTERCEPTOR_READ_RANGE(ctx, dir, REAL(strlen)(dir) + 1);
-  if (pfx) COMMON_INTERCEPTOR_READ_RANGE(ctx, pfx, REAL(strlen)(pfx) + 1);
+  if (dir) COMMON_INTERCEPTOR_READ_RANGE(ctx, dir, internal_strlen(dir) + 1);
+  if (pfx) COMMON_INTERCEPTOR_READ_RANGE(ctx, pfx, internal_strlen(pfx) + 1);
   char *res = REAL(tempnam)(dir, pfx);
-  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   return res;
 }
 #define INIT_TEMPNAM COMMON_INTERCEPT_FUNCTION(tempnam);
 #else
 #define INIT_TEMPNAM
 #endif
 
 #if SANITIZER_INTERCEPT_PTHREAD_SETNAME_NP && !SANITIZER_NETBSD
#endif
   ".size __tls_get_offset_wrapper, .-__tls_get_offset_wrapper\n"
 );
 #endif
 
 #if SANITIZER_INTERCEPT_LISTXATTR
 INTERCEPTOR(SSIZE_T, listxattr, const char *path, char *list, SIZE_T size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, listxattr, path, list, size);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   SSIZE_T res = REAL(listxattr)(path, list, size);
   // Here and below, size == 0 is a special case where nothing is written to the
   // buffer, and res contains the desired buffer size.
   if (size && res > 0 && list) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, list, res);
   return res;
 }
 INTERCEPTOR(SSIZE_T, llistxattr, const char *path, char *list, SIZE_T size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, llistxattr, path, list, size);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   SSIZE_T res = REAL(llistxattr)(path, list, size);
   if (size && res > 0 && list) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, list, res);
   return res;
 }
 INTERCEPTOR(SSIZE_T, flistxattr, int fd, char *list, SIZE_T size) {

 #define INIT_LISTXATTR
 #endif
 
 #if SANITIZER_INTERCEPT_GETXATTR
 INTERCEPTOR(SSIZE_T, getxattr, const char *path, const char *name, char *value,
             SIZE_T size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getxattr, path, name, value, size);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
-  if (name) COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
+  if (name) COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   SSIZE_T res = REAL(getxattr)(path, name, value, size);
   if (size && res > 0 && value) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, value, res);
   return res;
 }
 INTERCEPTOR(SSIZE_T, lgetxattr, const char *path, const char *name, char *value,
             SIZE_T size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, lgetxattr, path, name, value, size);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
-  if (name) COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
+  if (name) COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   SSIZE_T res = REAL(lgetxattr)(path, name, value, size);
   if (size && res > 0 && value) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, value, res);
   return res;
 }
 INTERCEPTOR(SSIZE_T, fgetxattr, int fd, const char *name, char *value,
             SIZE_T size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fgetxattr, fd, name, value, size);
-  if (name) COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  if (name) COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   SSIZE_T res = REAL(fgetxattr)(fd, name, value, size);
   if (size && res > 0 && value) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, value, res);
   return res;
 }
 #define INIT_GETXATTR                   \
INTERCEPTOR(int, getifaddrs, __sanitizer_ifaddrs **ifap) {
   int res = REAL(getifaddrs)(ifap);
   if (res == 0 && ifap) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ifap, sizeof(void *));
     __sanitizer_ifaddrs *p = *ifap;
     while (p) {
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, sizeof(__sanitizer_ifaddrs));
       if (p->ifa_name)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->ifa_name,
-                                       REAL(strlen)(p->ifa_name) + 1);
+                                       internal_strlen(p->ifa_name) + 1);
       if (p->ifa_addr)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->ifa_addr, struct_sockaddr_sz);
       if (p->ifa_netmask)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->ifa_netmask, struct_sockaddr_sz);
       // On Linux this is a union, but the other member also points to a
       // struct sockaddr, so the following is sufficient.
       if (p->ifa_dstaddr)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->ifa_dstaddr, struct_sockaddr_sz);

 INTERCEPTOR(char *, if_indextoname, unsigned int ifindex, char* ifname) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, if_indextoname, ifindex, ifname);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   char *res = REAL(if_indextoname)(ifindex, ifname);
   if (res && ifname)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ifname, REAL(strlen)(ifname) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ifname, internal_strlen(ifname) + 1);
   return res;
 }
 INTERCEPTOR(unsigned int, if_nametoindex, const char* ifname) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, if_nametoindex, ifname);
   if (ifname)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, ifname, REAL(strlen)(ifname) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, ifname, internal_strlen(ifname) + 1);
   return REAL(if_nametoindex)(ifname);
 }
 #define INIT_IF_INDEXTONAME                  \
   COMMON_INTERCEPT_FUNCTION(if_indextoname); \
   COMMON_INTERCEPT_FUNCTION(if_nametoindex);
 #else
 #define INIT_IF_INDEXTONAME
 #endif

 }
 
 INTERCEPTOR(int, xdr_string, __sanitizer_XDR *xdrs, char **p,
             unsigned maxsize) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, xdr_string, xdrs, p, maxsize);
   if (p && xdrs->x_op == __sanitizer_XDR_ENCODE) {
     COMMON_INTERCEPTOR_READ_RANGE(ctx, p, sizeof(*p));
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, *p, REAL(strlen)(*p) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, *p, internal_strlen(*p) + 1);
   }
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(xdr_string)(xdrs, p, maxsize);
   if (p && xdrs->x_op == __sanitizer_XDR_DECODE) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, sizeof(*p));
     if (res && *p)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, REAL(strlen)(*p) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *p, internal_strlen(*p) + 1);
   }
   return res;
 }
 
 #define INIT_XDR                               \
   COMMON_INTERCEPT_FUNCTION(xdrmem_create);    \
   COMMON_INTERCEPT_FUNCTION(xdrstdio_create);  \
   COMMON_INTERCEPT_FUNCTION(xdr_short);        \

 #else
 #define INIT_LIBIO_INTERNALS
 #endif
 
 #if SANITIZER_INTERCEPT_FOPEN
 INTERCEPTOR(__sanitizer_FILE *, fopen, const char *path, const char *mode) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fopen, path, mode);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, REAL(strlen)(mode) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, internal_strlen(mode) + 1);
   __sanitizer_FILE *res = REAL(fopen)(path, mode);
   COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, path);
   if (res) unpoison_file(res);
   return res;
 }
 INTERCEPTOR(__sanitizer_FILE *, fdopen, int fd, const char *mode) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fdopen, fd, mode);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, REAL(strlen)(mode) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, internal_strlen(mode) + 1);
   __sanitizer_FILE *res = REAL(fdopen)(fd, mode);
   if (res) unpoison_file(res);
   return res;
 }
 INTERCEPTOR(__sanitizer_FILE *, freopen, const char *path, const char *mode,
             __sanitizer_FILE *fp) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, freopen, path, mode, fp);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, REAL(strlen)(mode) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, internal_strlen(mode) + 1);
   COMMON_INTERCEPTOR_FILE_CLOSE(ctx, fp);
   __sanitizer_FILE *res = REAL(freopen)(path, mode, fp);
   COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, path);
   if (res) unpoison_file(res);
   return res;
 }
 #define INIT_FOPEN                   \
   COMMON_INTERCEPT_FUNCTION(fopen);  \
   COMMON_INTERCEPT_FUNCTION(fdopen); \
   COMMON_INTERCEPT_FUNCTION(freopen);
 #else
 #define INIT_FOPEN
 #endif
 
 #if SANITIZER_INTERCEPT_FLOPEN
 INTERCEPTOR(int, flopen, const char *path, int flags, ...) {
   void *ctx;
   va_list ap;
   va_start(ap, flags);
   u16 mode = static_cast<u16>(va_arg(ap, u32));
   va_end(ap);
   COMMON_INTERCEPTOR_ENTER(ctx, flopen, path, flags, mode);
   if (path) {
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   }
   return REAL(flopen)(path, flags, mode);
 }
 
 INTERCEPTOR(int, flopenat, int dirfd, const char *path, int flags, ...) {
   void *ctx;
   va_list ap;
   va_start(ap, flags);
   u16 mode = static_cast<u16>(va_arg(ap, u32));
   va_end(ap);
   COMMON_INTERCEPTOR_ENTER(ctx, flopen, path, flags, mode);
   if (path) {
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   }
   return REAL(flopenat)(dirfd, path, flags, mode);
 }
 
 #define INIT_FLOPEN    \
   COMMON_INTERCEPT_FUNCTION(flopen); \
   COMMON_INTERCEPT_FUNCTION(flopenat);
 #else
 #define INIT_FLOPEN
 #endif
 
 #if SANITIZER_INTERCEPT_FOPEN64
 INTERCEPTOR(__sanitizer_FILE *, fopen64, const char *path, const char *mode) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fopen64, path, mode);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, REAL(strlen)(mode) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, internal_strlen(mode) + 1);
   __sanitizer_FILE *res = REAL(fopen64)(path, mode);
   COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, path);
   if (res) unpoison_file(res);
   return res;
 }
 INTERCEPTOR(__sanitizer_FILE *, freopen64, const char *path, const char *mode,
             __sanitizer_FILE *fp) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, freopen64, path, mode, fp);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, REAL(strlen)(mode) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, internal_strlen(mode) + 1);
   COMMON_INTERCEPTOR_FILE_CLOSE(ctx, fp);
   __sanitizer_FILE *res = REAL(freopen64)(path, mode, fp);
   COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, path);
   if (res) unpoison_file(res);
   return res;
 }
 #define INIT_FOPEN64                  \
   COMMON_INTERCEPT_FUNCTION(fopen64); \

 #define INIT_DLOPEN_DLCLOSE
 #endif
 
 #if SANITIZER_INTERCEPT_GETPASS
 INTERCEPTOR(char *, getpass, const char *prompt) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getpass, prompt);
   if (prompt)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, prompt, REAL(strlen)(prompt)+1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, prompt, internal_strlen(prompt)+1);
   char *res = REAL(getpass)(prompt);
-  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res)+1);
+  if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res)+1);
   return res;
 }
 
 #define INIT_GETPASS COMMON_INTERCEPT_FUNCTION(getpass);
 #else
 #define INIT_GETPASS
 #endif
 

 
 INTERCEPTOR(__sanitizer_sem_t *, sem_open, const char *name, int oflag, ...) {
   void *ctx;
   va_list ap;
   va_start(ap, oflag);
   u32 mode = va_arg(ap, u32);
   u32 value = va_arg(ap, u32);
   COMMON_INTERCEPTOR_ENTER(ctx, sem_open, name, oflag, mode, value);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   __sanitizer_sem_t *s = REAL(sem_open)(name, oflag, mode, value);
   if (s)
     COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, sizeof(*s));
   va_end(ap);
   return s;
 }
 
 INTERCEPTOR(int, sem_unlink, const char *name) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sem_unlink, name);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   return REAL(sem_unlink)(name);
 }
 
 #  define INIT_SEM                            \
     COMMON_INTERCEPT_FUNCTION(sem_init);      \
     COMMON_INTERCEPT_FUNCTION(sem_destroy);   \
     COMMON_INTERCEPT_FUNCTION(sem_wait);      \
     COMMON_INTERCEPT_FUNCTION(sem_trywait);   \

 #endif
 
 #if SANITIZER_INTERCEPT_CTERMID
 INTERCEPTOR(char *, ctermid, char *s) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ctermid, s);
   char *res = REAL(ctermid)(s);
   if (res) {
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   }
   return res;
 }
 #define INIT_CTERMID COMMON_INTERCEPT_FUNCTION(ctermid);
 #else
 #define INIT_CTERMID
 #endif
 
 #if SANITIZER_INTERCEPT_CTERMID_R
 INTERCEPTOR(char *, ctermid_r, char *s) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ctermid_r, s);
   char *res = REAL(ctermid_r)(s);
   if (res) {
-    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, internal_strlen(res) + 1);
   }
   return res;
 }
 #define INIT_CTERMID_R COMMON_INTERCEPT_FUNCTION(ctermid_r);
 #else
 #define INIT_CTERMID_R
 #endif
 

 INTERCEPTOR(int, mprobe, void *ptr) {
   return 0;
 }
 #endif
 
 INTERCEPTOR(SIZE_T, wcslen, const wchar_t *s) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, wcslen, s);
   SIZE_T res = REAL(wcslen)(s);
   COMMON_INTERCEPTOR_READ_RANGE(ctx, s, sizeof(wchar_t) * (res + 1));
   return res;
 }
 
 INTERCEPTOR(SIZE_T, wcsnlen, const wchar_t *s, SIZE_T n) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, wcsnlen, s, n);
   SIZE_T res = REAL(wcsnlen)(s, n);
   COMMON_INTERCEPTOR_READ_RANGE(ctx, s, sizeof(wchar_t) * Min(res + 1, n));
   return res;
 }
 #define INIT_WCSLEN                  \
   COMMON_INTERCEPT_FUNCTION(wcslen); \
   COMMON_INTERCEPT_FUNCTION(wcsnlen);
 
 #if SANITIZER_INTERCEPT_WCSCAT
 INTERCEPTOR(wchar_t *, wcscat, wchar_t *dst, const wchar_t *src) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, wcscat, dst, src);
-  SIZE_T src_size = REAL(wcslen)(src);
-  SIZE_T dst_size = REAL(wcslen)(dst);
+  SIZE_T src_size = internal_wcslen(src);
+  SIZE_T dst_size = internal_wcslen(dst);
   COMMON_INTERCEPTOR_READ_RANGE(ctx, src, (src_size + 1) * sizeof(wchar_t));
   COMMON_INTERCEPTOR_READ_RANGE(ctx, dst, (dst_size + 1) * sizeof(wchar_t));
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst + dst_size,
                                  (src_size + 1) * sizeof(wchar_t));
   return REAL(wcscat)(dst, src);
 }
 
 INTERCEPTOR(wchar_t *, wcsncat, wchar_t *dst, const wchar_t *src, SIZE_T n) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, wcsncat, dst, src, n);
-  SIZE_T src_size = REAL(wcsnlen)(src, n);
-  SIZE_T dst_size = REAL(wcslen)(dst);
+  SIZE_T src_size = internal_wcsnlen(src, n);
+  SIZE_T dst_size = internal_wcslen(dst);
   COMMON_INTERCEPTOR_READ_RANGE(ctx, src,
                                 Min(src_size + 1, n) * sizeof(wchar_t));
   COMMON_INTERCEPTOR_READ_RANGE(ctx, dst, (dst_size + 1) * sizeof(wchar_t));
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst + dst_size,
                                  (src_size + 1) * sizeof(wchar_t));
   return REAL(wcsncat)(dst, src, n);
 }
 #define INIT_WCSCAT                  \
   COMMON_INTERCEPT_FUNCTION(wcscat); \
   COMMON_INTERCEPT_FUNCTION(wcsncat);
 #else
 #define INIT_WCSCAT
 #endif
 
 #if SANITIZER_INTERCEPT_WCSDUP
 INTERCEPTOR(wchar_t *, wcsdup, wchar_t *s) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, wcsdup, s);
-  SIZE_T len = REAL(wcslen)(s);
+  SIZE_T len = internal_wcslen(s);
   COMMON_INTERCEPTOR_READ_RANGE(ctx, s, sizeof(wchar_t) * (len + 1));
   wchar_t *result = REAL(wcsdup)(s);
   if (result)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, result, sizeof(wchar_t) * (len + 1));
   return result;
 }
 
 #define INIT_WCSDUP COMMON_INTERCEPT_FUNCTION(wcsdup);
 #else
 #define INIT_WCSDUP
 #endif
 
 #if SANITIZER_INTERCEPT_STRXFRM
-static SIZE_T RealStrLen(const char *str) { return REAL(strlen)(str); }
+static SIZE_T RealStrLen(const char *str) { return internal_strlen(str); }
 
 static SIZE_T RealStrLen(const wchar_t *str) { return REAL(wcslen)(str); }
 
 #define STRXFRM_INTERCEPTOR_IMPL(strxfrm, dest, src, len, ...)             \
   {                                                                        \
     void *ctx;                                                             \
     COMMON_INTERCEPTOR_ENTER(ctx, strxfrm, dest, src, len, ##__VA_ARGS__); \
     COMMON_INTERCEPTOR_READ_RANGE(ctx, src,                                \

 #define INIT___WCSXFRM_L
 #endif
 
 #if SANITIZER_INTERCEPT_ACCT
 INTERCEPTOR(int, acct, const char *file) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, acct, file);
   if (file)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, file, REAL(strlen)(file) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, file, internal_strlen(file) + 1);
   return REAL(acct)(file);
 }
 #define INIT_ACCT COMMON_INTERCEPT_FUNCTION(acct)
 #else
 #define INIT_ACCT
 #endif
 
 #if SANITIZER_INTERCEPT_USER_FROM_UID
 INTERCEPTOR(const char *, user_from_uid, u32 uid, int nouser) {
   void *ctx;
   const char *user;
   COMMON_INTERCEPTOR_ENTER(ctx, user_from_uid, uid, nouser);
   user = REAL(user_from_uid)(uid, nouser);
   if (user)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, user, REAL(strlen)(user) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, user, internal_strlen(user) + 1);
   return user;
 }
 #define INIT_USER_FROM_UID COMMON_INTERCEPT_FUNCTION(user_from_uid)
 #else
 #define INIT_USER_FROM_UID
 #endif
 
 #if SANITIZER_INTERCEPT_UID_FROM_USER
 INTERCEPTOR(int, uid_from_user, const char *name, u32 *uid) {
   void *ctx;
   int res;
   COMMON_INTERCEPTOR_ENTER(ctx, uid_from_user, name, uid);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   res = REAL(uid_from_user)(name, uid);
   if (uid)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, uid, sizeof(*uid));
   return res;
 }
 #define INIT_UID_FROM_USER COMMON_INTERCEPT_FUNCTION(uid_from_user)
 #else
 #define INIT_UID_FROM_USER
 #endif
 
 #if SANITIZER_INTERCEPT_GROUP_FROM_GID
 INTERCEPTOR(const char *, group_from_gid, u32 gid, int nogroup) {
   void *ctx;
   const char *group;
   COMMON_INTERCEPTOR_ENTER(ctx, group_from_gid, gid, nogroup);
   group = REAL(group_from_gid)(gid, nogroup);
   if (group)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, group, REAL(strlen)(group) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, group, internal_strlen(group) + 1);
   return group;
 }
 #define INIT_GROUP_FROM_GID COMMON_INTERCEPT_FUNCTION(group_from_gid)
 #else
 #define INIT_GROUP_FROM_GID
 #endif
 
 #if SANITIZER_INTERCEPT_GID_FROM_GROUP
 INTERCEPTOR(int, gid_from_group, const char *group, u32 *gid) {
   void *ctx;
   int res;
   COMMON_INTERCEPTOR_ENTER(ctx, gid_from_group, group, gid);
   if (group)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, group, REAL(strlen)(group) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, group, internal_strlen(group) + 1);
   res = REAL(gid_from_group)(group, gid);
   if (gid)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, gid, sizeof(*gid));
   return res;
 }
 #define INIT_GID_FROM_GROUP COMMON_INTERCEPT_FUNCTION(gid_from_group)
 #else
 #define INIT_GID_FROM_GROUP
 #endif
 
 #if SANITIZER_INTERCEPT_ACCESS
 INTERCEPTOR(int, access, const char *path, int mode) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, access, path, mode);
   if (path)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   return REAL(access)(path, mode);
 }
 #define INIT_ACCESS COMMON_INTERCEPT_FUNCTION(access)
 #else
 #define INIT_ACCESS
 #endif
 
 #if SANITIZER_INTERCEPT_FACCESSAT
 INTERCEPTOR(int, faccessat, int fd, const char *path, int mode, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, faccessat, fd, path, mode, flags);
   if (path)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   return REAL(faccessat)(fd, path, mode, flags);
 }
 #define INIT_FACCESSAT COMMON_INTERCEPT_FUNCTION(faccessat)
 #else
 #define INIT_FACCESSAT
 #endif
 
 #if SANITIZER_INTERCEPT_GETGROUPLIST
 INTERCEPTOR(int, getgrouplist, const char *name, u32 basegid, u32 *groups,
             int *ngroups) {
   void *ctx;
   int res;
   COMMON_INTERCEPTOR_ENTER(ctx, getgrouplist, name, basegid, groups, ngroups);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   if (ngroups)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, ngroups, sizeof(*ngroups));
   res = REAL(getgrouplist)(name, basegid, groups, ngroups);
   if (!res && groups && ngroups) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, groups, sizeof(*groups) * (*ngroups));
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ngroups, sizeof(*ngroups));
   }
   return res;
 }
 
 #define INIT_GETGROUPLIST COMMON_INTERCEPT_FUNCTION(getgrouplist);
 #else
 #define INIT_GETGROUPLIST
 #endif
 
 #if SANITIZER_INTERCEPT_GETGROUPMEMBERSHIP
 INTERCEPTOR(int, getgroupmembership, const char *name, u32 basegid, u32 *groups,
             int maxgrp, int *ngroups) {
   void *ctx;
   int res;
   COMMON_INTERCEPTOR_ENTER(ctx, getgroupmembership, name, basegid, groups,
                            maxgrp, ngroups);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   res = REAL(getgroupmembership)(name, basegid, groups, maxgrp, ngroups);
   if (!res && groups && ngroups) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, groups, sizeof(*groups) * (*ngroups));
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ngroups, sizeof(*ngroups));
   }
   return res;
 }
 
 #define INIT_GETGROUPMEMBERSHIP COMMON_INTERCEPT_FUNCTION(getgroupmembership);
 #else
 #define INIT_GETGROUPMEMBERSHIP
 #endif
 
 #if SANITIZER_INTERCEPT_READLINK
 INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) {
   void* ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, readlink, path, buf, bufsiz);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   SSIZE_T res = REAL(readlink)(path, buf, bufsiz);
   if (res > 0)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, res);
   return res;
 }
 
 #define INIT_READLINK COMMON_INTERCEPT_FUNCTION(readlink)
 #else
 #define INIT_READLINK
 #endif
 
 #if SANITIZER_INTERCEPT_READLINKAT
 INTERCEPTOR(SSIZE_T, readlinkat, int dirfd, const char *path, char *buf,
             SIZE_T bufsiz) {
   void* ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, readlinkat, dirfd, path, buf, bufsiz);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   SSIZE_T res = REAL(readlinkat)(dirfd, path, buf, bufsiz);
   if (res > 0)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, res);
   return res;
 }
 
 #define INIT_READLINKAT COMMON_INTERCEPT_FUNCTION(readlinkat)
 #else
 #define INIT_READLINKAT
 #endif
 
 #if SANITIZER_INTERCEPT_NAME_TO_HANDLE_AT
 INTERCEPTOR(int, name_to_handle_at, int dirfd, const char *pathname,
             struct file_handle *handle, int *mount_id, int flags) {
   void* ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, name_to_handle_at, dirfd, pathname, handle,
                            mount_id, flags);
-  COMMON_INTERCEPTOR_READ_RANGE(ctx, pathname, REAL(strlen)(pathname) + 1);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, pathname, internal_strlen(pathname) + 1);
 
   __sanitizer_file_handle *sanitizer_handle =
       reinterpret_cast<__sanitizer_file_handle*>(handle);
   COMMON_INTERCEPTOR_READ_RANGE(
       ctx, &sanitizer_handle->handle_bytes,
       sizeof(sanitizer_handle->handle_bytes));
 
   int res = REAL(name_to_handle_at)(dirfd, pathname, handle, mount_id, flags);
INTERCEPTOR(SIZE_T, strlcpy, char *dst, char *src, SIZE_T size) {
   SIZE_T res;
   COMMON_INTERCEPTOR_ENTER(ctx, strlcpy, dst, src, size);
   if (src) {
     // Keep strnlen as macro argument, as macro may ignore it.
     COMMON_INTERCEPTOR_READ_STRING(
         ctx, src, Min(internal_strnlen(src, size), size - 1) + 1);
   }
   res = REAL(strlcpy)(dst, src, size);
-  COMMON_INTERCEPTOR_COPY_STRING(ctx, dst, src, REAL(strlen)(dst) + 1);
+  COMMON_INTERCEPTOR_COPY_STRING(ctx, dst, src, internal_strlen(dst) + 1);
   return res;
 }
 
 INTERCEPTOR(SIZE_T, strlcat, char *dst, char *src, SIZE_T size) {
   void *ctx;
   SIZE_T len = 0;
   COMMON_INTERCEPTOR_ENTER(ctx, strlcat, dst, src, size);
   // src is checked in the strlcpy() interceptor

 
 #if SANITIZER_INTERCEPT_DEVNAME
 INTERCEPTOR(char *, devname, u64 dev, u32 type) {
   void *ctx;
   char *name;
   COMMON_INTERCEPTOR_ENTER(ctx, devname, dev, type);
   name = REAL(devname)(dev, type);
   if (name)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, internal_strlen(name) + 1);
   return name;
 }
 #define INIT_DEVNAME COMMON_INTERCEPT_FUNCTION(devname);
 #else
 #define INIT_DEVNAME
 #endif
 
 #if SANITIZER_INTERCEPT_DEVNAME_R
 #if SANITIZER_NETBSD
 #define DEVNAME_R_RETTYPE int
 #define DEVNAME_R_SUCCESS(x) (!(x))
 #else
 #define DEVNAME_R_RETTYPE char*
 #define DEVNAME_R_SUCCESS(x) (x)
 #endif
 INTERCEPTOR(DEVNAME_R_RETTYPE, devname_r, u64 dev, u32 type, char *path,
             uptr len) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, devname_r, dev, type, path, len);
   DEVNAME_R_RETTYPE res = REAL(devname_r)(dev, type, path, len);
   if (DEVNAME_R_SUCCESS(res))
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, path, internal_strlen(path) + 1);
   return res;
 }
 #define INIT_DEVNAME_R COMMON_INTERCEPT_FUNCTION(devname_r);
 #else
 #define INIT_DEVNAME_R
 #endif
 
 #if SANITIZER_INTERCEPT_FGETLN

 #endif
 
 #if SANITIZER_INTERCEPT_STRMODE
 INTERCEPTOR(void, strmode, u32 mode, char *bp) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strmode, mode, bp);
   REAL(strmode)(mode, bp);
   if (bp)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, bp, REAL(strlen)(bp) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, bp, internal_strlen(bp) + 1);
 }
 #define INIT_STRMODE COMMON_INTERCEPT_FUNCTION(strmode)
 #else
 #define INIT_STRMODE
 #endif
 
 #if SANITIZER_INTERCEPT_TTYENT
 INTERCEPTOR(struct __sanitizer_ttyent *, getttyent, void) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getttyent);
   struct __sanitizer_ttyent *ttyent = REAL(getttyent)();
   if (ttyent)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ttyent, struct_ttyent_sz);
   return ttyent;
 }
 INTERCEPTOR(struct __sanitizer_ttyent *, getttynam, char *name) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getttynam, name);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   struct __sanitizer_ttyent *ttyent = REAL(getttynam)(name);
   if (ttyent)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ttyent, struct_ttyent_sz);
   return ttyent;
 }
 INTERCEPTOR(int, setttyentpath, char *path) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, setttyentpath, path);
   if (path)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   return REAL(setttyentpath)(path);
 }
 #define INIT_TTYENT \
   COMMON_INTERCEPT_FUNCTION(getttyent); \
   COMMON_INTERCEPT_FUNCTION(getttynam); \
   COMMON_INTERCEPT_FUNCTION(setttyentpath)
 #else
 #define INIT_TTYENT
 #endif
 
 #if SANITIZER_INTERCEPT_PROTOENT
 static void write_protoent(void *ctx, struct __sanitizer_protoent *p) {
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p, sizeof(*p));
 
-  COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->p_name, REAL(strlen)(p->p_name) + 1);
+  COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->p_name, internal_strlen(p->p_name) + 1);
 
   SIZE_T pp_size = 1; // One handles the trailing \0
 
   for (char **pp = p->p_aliases; *pp; ++pp, ++pp_size)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *pp, REAL(strlen)(*pp) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *pp, internal_strlen(*pp) + 1);
 
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, p->p_aliases,
                                   pp_size * sizeof(char **));
 }
 
 INTERCEPTOR(struct __sanitizer_protoent *, getprotoent) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getprotoent);
   struct __sanitizer_protoent *p = REAL(getprotoent)();
   if (p)
     write_protoent(ctx, p);
   return p;
 }
 
 INTERCEPTOR(struct __sanitizer_protoent *, getprotobyname, const char *name) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getprotobyname, name);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   struct __sanitizer_protoent *p = REAL(getprotobyname)(name);
   if (p)
     write_protoent(ctx, p);
   return p;
 }
 
 INTERCEPTOR(struct __sanitizer_protoent *, getprotobynumber, int proto) {
   void *ctx;

 
 INTERCEPTOR(int, getprotobyname_r, const char *name,
             struct __sanitizer_protoent *result_buf, char *buf, SIZE_T buflen,
             struct __sanitizer_protoent **result) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getprotobyname_r, name, result_buf, buf,
                            buflen, result);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   int res = REAL(getprotobyname_r)(name, result_buf, buf, buflen, result);
 
   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, result, sizeof *result);
   if (!res && *result)
     write_protoent(ctx, *result);
   return res;
 }
 

 #if SANITIZER_INTERCEPT_NETENT
 INTERCEPTOR(struct __sanitizer_netent *, getnetent) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getnetent);
   struct __sanitizer_netent *n = REAL(getnetent)();
   if (n) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n, sizeof(*n));
 
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, REAL(strlen)(n->n_name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, internal_strlen(n->n_name) + 1);
 
     SIZE_T nn_size = 1; // One handles the trailing \0
 
     for (char **nn = n->n_aliases; *nn; ++nn, ++nn_size)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, REAL(strlen)(*nn) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, internal_strlen(*nn) + 1);
 
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_aliases,
                                    nn_size * sizeof(char **));
   }
   return n;
 }
 
 INTERCEPTOR(struct __sanitizer_netent *, getnetbyname, const char *name) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getnetbyname, name);
   if (name)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   struct __sanitizer_netent *n = REAL(getnetbyname)(name);
   if (n) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n, sizeof(*n));
 
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, REAL(strlen)(n->n_name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, internal_strlen(n->n_name) + 1);
 
     SIZE_T nn_size = 1; // One handles the trailing \0
 
     for (char **nn = n->n_aliases; *nn; ++nn, ++nn_size)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, REAL(strlen)(*nn) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, internal_strlen(*nn) + 1);
 
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_aliases,
                                    nn_size * sizeof(char **));
   }
   return n;
 }
 
 INTERCEPTOR(struct __sanitizer_netent *, getnetbyaddr, u32 net, int type) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getnetbyaddr, net, type);
   struct __sanitizer_netent *n = REAL(getnetbyaddr)(net, type);
   if (n) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n, sizeof(*n));
 
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, REAL(strlen)(n->n_name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, internal_strlen(n->n_name) + 1);
 
     SIZE_T nn_size = 1; // One handles the trailing \0
 
     for (char **nn = n->n_aliases; *nn; ++nn, ++nn_size)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, REAL(strlen)(*nn) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, internal_strlen(*nn) + 1);
 
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_aliases,
                                    nn_size * sizeof(char **));
   }
   return n;
 }
 #define INIT_NETENT \
   COMMON_INTERCEPT_FUNCTION(getnetent); \

 #define INIT_GETVFSSTAT
 #endif
 
 #if SANITIZER_INTERCEPT_REGEX
 INTERCEPTOR(int, regcomp, void *preg, const char *pattern, int cflags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, regcomp, preg, pattern, cflags);
   if (pattern)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, pattern, REAL(strlen)(pattern) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, pattern, internal_strlen(pattern) + 1);
   int res = REAL(regcomp)(preg, pattern, cflags);
   if (!res)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, preg, struct_regex_sz);
   return res;
 }
 INTERCEPTOR(int, regexec, const void *preg, const char *string, SIZE_T nmatch,
             struct __sanitizer_regmatch *pmatch[], int eflags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, regexec, preg, string, nmatch, pmatch, eflags);
   if (preg)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, preg, struct_regex_sz);
   if (string)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, string, REAL(strlen)(string) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, string, internal_strlen(string) + 1);
   int res = REAL(regexec)(preg, string, nmatch, pmatch, eflags);
   if (!res && pmatch)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, pmatch, nmatch * struct_regmatch_sz);
   return res;
 }
 INTERCEPTOR(SIZE_T, regerror, int errcode, const void *preg, char *errbuf,
             SIZE_T errbuf_size) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, regerror, errcode, preg, errbuf, errbuf_size);
   if (preg)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, preg, struct_regex_sz);
   SIZE_T res = REAL(regerror)(errcode, preg, errbuf, errbuf_size);
   if (errbuf)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, errbuf, REAL(strlen)(errbuf) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, errbuf, internal_strlen(errbuf) + 1);
   return res;
 }
 INTERCEPTOR(void, regfree, const void *preg) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, regfree, preg);
   if (preg)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, preg, struct_regex_sz);
   REAL(regfree)(preg);
 }
 #define INIT_REGEX                                                             \
   COMMON_INTERCEPT_FUNCTION(regcomp);                                          \
   COMMON_INTERCEPT_FUNCTION_GLIBC_VER_MIN(regexec, "GLIBC_2.3.4");             \
   COMMON_INTERCEPT_FUNCTION(regerror);                                         \
   COMMON_INTERCEPT_FUNCTION(regfree);
 #else
 #define INIT_REGEX
 #endif
 
 #if SANITIZER_INTERCEPT_REGEXSUB
 INTERCEPTOR(SSIZE_T, regnsub, char *buf, SIZE_T bufsiz, const char *sub,
             const struct __sanitizer_regmatch *rm, const char *str) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, regnsub, buf, bufsiz, sub, rm, str);
   if (sub)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sub, REAL(strlen)(sub) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sub, internal_strlen(sub) + 1);
   // The implementation demands and hardcodes 10 elements
   if (rm)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, rm, 10 * struct_regmatch_sz);
   if (str)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, str, REAL(strlen)(str) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, str, internal_strlen(str) + 1);
   SSIZE_T res = REAL(regnsub)(buf, bufsiz, sub, rm, str);
   if (res > 0 && buf)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, REAL(strlen)(buf) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, internal_strlen(buf) + 1);
   return res;
 }
 INTERCEPTOR(SSIZE_T, regasub, char **buf, const char *sub,
             const struct __sanitizer_regmatch *rm, const char *sstr) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, regasub, buf, sub, rm, sstr);
   if (sub)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sub, REAL(strlen)(sub) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sub, internal_strlen(sub) + 1);
   // Hardcode 10 elements as this is hardcoded size
   if (rm)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, rm, 10 * struct_regmatch_sz);
   if (sstr)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sstr, REAL(strlen)(sstr) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sstr, internal_strlen(sstr) + 1);
   SSIZE_T res = REAL(regasub)(buf, sub, rm, sstr);
   if (res > 0 && buf) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, sizeof(char *));
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *buf, REAL(strlen)(*buf) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *buf, internal_strlen(*buf) + 1);
   }
   return res;
 }
 
 #define INIT_REGEXSUB                                                          \
   COMMON_INTERCEPT_FUNCTION(regnsub);                                          \
   COMMON_INTERCEPT_FUNCTION(regasub);
 #else
 #define INIT_REGEXSUB
 #endif
 
 #if SANITIZER_INTERCEPT_FTS
 INTERCEPTOR(void *, fts_open, char *const *path_argv, int options,
             int (*compar)(void **, void **)) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fts_open, path_argv, options, compar);
   if (path_argv) {
     for (char *const *pa = path_argv; ; ++pa) {
       COMMON_INTERCEPTOR_READ_RANGE(ctx, pa, sizeof(char **));
       if (!*pa)
         break;
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, REAL(strlen)(*pa) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, internal_strlen(*pa) + 1);
     }
   }
   // TODO(kamil): handle compar callback
   void *fts = REAL(fts_open)(path_argv, options, compar);
   if (fts)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, fts, struct_FTS_sz);
   return fts;
 }

 INTERCEPTOR(int, sysctlbyname, char *sname, void *oldp, SIZE_T *oldlenp,
             void *newp, SIZE_T newlen) {
   void *ctx;
   if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
     return internal_sysctlbyname(sname, oldp, oldlenp, newp, newlen);
   COMMON_INTERCEPTOR_ENTER(ctx, sysctlbyname, sname, oldp, oldlenp, newp,
                            newlen);
   if (sname)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, REAL(strlen)(sname) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, internal_strlen(sname) + 1);
   if (oldlenp)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, oldlenp, sizeof(*oldlenp));
   if (newp && newlen)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, newp, newlen);
   int res = REAL(sysctlbyname)(sname, oldp, oldlenp, newp, newlen);
   if (!res) {
     if (oldlenp) {
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, oldlenp, sizeof(*oldlenp));
       if (oldp)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, oldp, *oldlenp);
     }
   }
   return res;
 }
 
 INTERCEPTOR(int, sysctlnametomib, const char *sname, int *name,
             SIZE_T *namelenp) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sysctlnametomib, sname, name, namelenp);
   if (sname)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, REAL(strlen)(sname) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, internal_strlen(sname) + 1);
   if (namelenp)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, namelenp, sizeof(*namelenp));
   int res = REAL(sysctlnametomib)(sname, name, namelenp);
   if (!res) {
     if (namelenp) {
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, namelenp, sizeof(*namelenp));
       if (name)
         COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, *namelenp * sizeof(*name));
INTERCEPTOR(void *, asysctl, const int *name, SIZE_T namelen, SIZE_T *len) {
   }
   return res;
 }
 
 INTERCEPTOR(void *, asysctlbyname, const char *sname, SIZE_T *len) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, asysctlbyname, sname, len);
   if (sname)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, REAL(strlen)(sname) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, internal_strlen(sname) + 1);
   void *res = REAL(asysctlbyname)(sname, len);
   if (res && len) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, len, sizeof(*len));
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, *len);
   }
   return res;
 }
 #define INIT_ASYSCTL                           \
   COMMON_INTERCEPT_FUNCTION(asysctl);          \
   COMMON_INTERCEPT_FUNCTION(asysctlbyname);
 #else
 #define INIT_ASYSCTL
 #endif
 
 #if SANITIZER_INTERCEPT_SYSCTLGETMIBINFO
 INTERCEPTOR(int, sysctlgetmibinfo, char *sname, int *name,
             unsigned int *namelenp, char *cname, SIZE_T *csz, void **rnode,
             int v) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sysctlgetmibinfo, sname, name, namelenp, cname,
                            csz, rnode, v);
   if (sname)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, REAL(strlen)(sname) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, sname, internal_strlen(sname) + 1);
   if (namelenp)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, namelenp, sizeof(*namelenp));
   if (csz)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, csz, sizeof(*csz));
   // Skip rnode, it's rarely used and not trivial to sanitize
   // It's also used mostly internally
   int res = REAL(sysctlgetmibinfo)(sname, name, namelenp, cname, csz, rnode, v);
   if (!res) {

 #endif
 
 #if SANITIZER_INTERCEPT_NL_LANGINFO
 INTERCEPTOR(char *, nl_langinfo, long item) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, nl_langinfo, item);
   char *ret = REAL(nl_langinfo)(item);
   if (ret)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, REAL(strlen)(ret) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, internal_strlen(ret) + 1);
   return ret;
 }
 #define INIT_NL_LANGINFO COMMON_INTERCEPT_FUNCTION(nl_langinfo)
 #else
 #define INIT_NL_LANGINFO
 #endif
 
 #if SANITIZER_INTERCEPT_MODCTL
 INTERCEPTOR(int, modctl, int operation, void *argp) {
   void *ctx;
   int ret;
   COMMON_INTERCEPTOR_ENTER(ctx, modctl, operation, argp);
 
   if (operation == modctl_load) {
     if (argp) {
       __sanitizer_modctl_load_t *ml = (__sanitizer_modctl_load_t *)argp;
       COMMON_INTERCEPTOR_READ_RANGE(ctx, ml, sizeof(*ml));
       if (ml->ml_filename)
         COMMON_INTERCEPTOR_READ_RANGE(ctx, ml->ml_filename,
-                                      REAL(strlen)(ml->ml_filename) + 1);
+                                      internal_strlen(ml->ml_filename) + 1);
       if (ml->ml_props)
         COMMON_INTERCEPTOR_READ_RANGE(ctx, ml->ml_props, ml->ml_propslen);
     }
     ret = REAL(modctl)(operation, argp);
   } else if (operation == modctl_unload) {
     if (argp) {
       const char *name = (const char *)argp;
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
     }
     ret = REAL(modctl)(operation, argp);
   } else if (operation == modctl_stat) {
     uptr iov_len;
     struct __sanitizer_iovec *iov = (struct __sanitizer_iovec *)argp;
     if (iov) {
       COMMON_INTERCEPTOR_READ_RANGE(ctx, iov, sizeof(*iov));
       iov_len = iov->iov_len;
INTERCEPTOR(long long, strtonum, const char *nptr, long long minval,
   char *real_endptr;
   long long ret = (long long)REAL(strtoimax)(nptr, &real_endptr, 10);
   StrtolFixAndCheck(ctx, nptr, nullptr, real_endptr, 10);
 
   ret = REAL(strtonum)(nptr, minval, maxval, errstr);
   if (errstr) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, errstr, sizeof(const char *));
      if (*errstr)
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *errstr, REAL(strlen)(*errstr) + 1);
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *errstr, internal_strlen(*errstr) + 1);
   }
   return ret;
 }
 #define INIT_STRTONUM COMMON_INTERCEPT_FUNCTION(strtonum)
 #else
 #define INIT_STRTONUM
 #endif
 
 #if SANITIZER_INTERCEPT_FPARSELN
 INTERCEPTOR(char *, fparseln, __sanitizer_FILE *stream, SIZE_T *len,
             SIZE_T *lineno, const char delim[3], int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fparseln, stream, len, lineno, delim, flags);
   if (lineno)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, lineno, sizeof(*lineno));
   if (delim)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, delim, sizeof(delim[0]) * 3);
   char *ret = REAL(fparseln)(stream, len, lineno, delim, flags);
   if (ret) {
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, REAL(strlen)(ret) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, internal_strlen(ret) + 1);
     if (len)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, len, sizeof(*len));
     if (lineno)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, lineno, sizeof(*lineno));
   }
   return ret;
 }
 #define INIT_FPARSELN COMMON_INTERCEPT_FUNCTION(fparseln)
 #else
 #define INIT_FPARSELN
 #endif
 
 #if SANITIZER_INTERCEPT_STATVFS1
 INTERCEPTOR(int, statvfs1, const char *path, void *buf, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statvfs1, path, buf, flags);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   int res = REAL(statvfs1)(path, buf, flags);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statvfs_sz);
   return res;
 }
 INTERCEPTOR(int, fstatvfs1, int fd, void *buf, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fstatvfs1, fd, buf, flags);
   COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd);
INTERCEPTOR(char *, SHA1End, void *context, char *buf) {
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, SHA1_return_length);
   return ret;
 }
 INTERCEPTOR(char *, SHA1File, char *filename, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, SHA1File, filename, buf);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(SHA1File)(filename, buf);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, SHA1_return_length);
   return ret;
 }
 INTERCEPTOR(char *, SHA1FileChunk, char *filename, char *buf, OFF_T offset,
   OFF_T length) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, SHA1FileChunk, filename, buf, offset, length);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(SHA1FileChunk)(filename, buf, offset, length);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, SHA1_return_length);
   return ret;
 }
 INTERCEPTOR(char *, SHA1Data, u8 *data, SIZE_T len, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, SHA1Data, data, len, buf);
if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, MD4_return_length);
   return ret;
 }
 
 INTERCEPTOR(char *, MD4File, const char *filename, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, MD4File, filename, buf);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(MD4File)(filename, buf);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, MD4_return_length);
   return ret;
 }
 
 INTERCEPTOR(char *, MD4Data, const unsigned char *data, unsigned int len,
             char *buf) {
INTERCEPTOR(char *, RMD160End, void *context, char *buf) {
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, RMD160_return_length);
   return ret;
 }
 INTERCEPTOR(char *, RMD160File, char *filename, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, RMD160File, filename, buf);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(RMD160File)(filename, buf);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, RMD160_return_length);
   return ret;
 }
 INTERCEPTOR(char *, RMD160FileChunk, char *filename, char *buf, OFF_T offset,
   OFF_T length) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, RMD160FileChunk, filename, buf, offset, length);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(RMD160FileChunk)(filename, buf, offset, length);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, RMD160_return_length);
   return ret;
 }
 INTERCEPTOR(char *, RMD160Data, u8 *data, SIZE_T len, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, RMD160Data, data, len, buf);
if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, MD5_return_length);
   return ret;
 }
 
 INTERCEPTOR(char *, MD5File, const char *filename, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, MD5File, filename, buf);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(MD5File)(filename, buf);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, MD5_return_length);
   return ret;
 }
 
 INTERCEPTOR(char *, MD5Data, const unsigned char *data, unsigned int len,
             char *buf) {
if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, MD2_return_length);
   return ret;
 }
 
 INTERCEPTOR(char *, MD2File, const char *filename, char *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, MD2File, filename, buf);
   if (filename)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);
   char *ret = REAL(MD2File)(filename, buf);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, MD2_return_length);
   return ret;
 }
 
 INTERCEPTOR(char *, MD2Data, const unsigned char *data, unsigned int len,
             char *buf) {
INTERCEPTOR(char *, SHA##LEN##_End, void *context, char *buf) { \
     if (ret) \
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, SHA##LEN##_return_length); \
     return ret; \
   } \
   INTERCEPTOR(char *, SHA##LEN##_File, const char *filename, char *buf) { \
     void *ctx; \
     COMMON_INTERCEPTOR_ENTER(ctx, SHA##LEN##_File, filename, buf); \
     if (filename) \
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);\
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);\
     char *ret = REAL(SHA##LEN##_File)(filename, buf); \
     if (ret) \
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, SHA##LEN##_return_length); \
     return ret; \
   } \
   INTERCEPTOR(char *, SHA##LEN##_FileChunk, const char *filename, char *buf, \
               OFF_T offset, OFF_T length) { \
     void *ctx; \
     COMMON_INTERCEPTOR_ENTER(ctx, SHA##LEN##_FileChunk, filename, buf, offset, \
   length); \
     if (filename) \
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, REAL(strlen)(filename) + 1);\
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, filename, internal_strlen(filename) + 1);\
     char *ret = REAL(SHA##LEN##_FileChunk)(filename, buf, offset, length); \
     if (ret) \
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, SHA##LEN##_return_length); \
     return ret; \
   } \
   INTERCEPTOR(char *, SHA##LEN##_Data, u8 *data, SIZE_T len, char *buf) { \
     void *ctx; \
     COMMON_INTERCEPTOR_ENTER(ctx, SHA##LEN##_Data, data, len, buf); \
INTERCEPTOR(char *, nvis, char *dst, SIZE_T dlen, int c, int flag, int nextc) {
   if (dst && end)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, end - dst + 1);
   return end;
 }
 INTERCEPTOR(int, strvis, char *dst, const char *src, int flag) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strvis, dst, src, flag);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int len = REAL(strvis)(dst, src, flag);
   if (dst)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, len + 1);
   return len;
 }
 INTERCEPTOR(int, stravis, char **dst, const char *src, int flag) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, stravis, dst, src, flag);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int len = REAL(stravis)(dst, src, flag);
   if (dst) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, sizeof(char *));
     if (*dst)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *dst, len + 1);
   }
   return len;
 }
 INTERCEPTOR(int, strnvis, char *dst, SIZE_T dlen, const char *src, int flag) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strnvis, dst, dlen, src, flag);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int len = REAL(strnvis)(dst, dlen, src, flag);
   // The interface will be valid even if there is no space for NULL char
   if (dst && len > 0)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, len + 1);
   return len;
 }
 INTERCEPTOR(int, strvisx, char *dst, const char *src, SIZE_T len, int flag) {
   void *ctx;
if (cerr_ptr)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, cerr_ptr, sizeof(int));
   return ret;
 }
 INTERCEPTOR(char *, svis, char *dst, int c, int flag, int nextc,
             const char *extra) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, svis, dst, c, flag, nextc, extra);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   char *end = REAL(svis)(dst, c, flag, nextc, extra);
   if (dst && end)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, end - dst + 1);
   return end;
 }
 INTERCEPTOR(char *, snvis, char *dst, SIZE_T dlen, int c, int flag, int nextc,
             const char *extra) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, snvis, dst, dlen, c, flag, nextc, extra);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   char *end = REAL(snvis)(dst, dlen, c, flag, nextc, extra);
   if (dst && end)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst,
                                    Min((SIZE_T)(end - dst + 1), dlen));
   return end;
 }
 INTERCEPTOR(int, strsvis, char *dst, const char *src, int flag,
             const char *extra) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strsvis, dst, src, flag, extra);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   int len = REAL(strsvis)(dst, src, flag, extra);
   if (dst)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, len + 1);
   return len;
 }
 INTERCEPTOR(int, strsnvis, char *dst, SIZE_T dlen, const char *src, int flag,
             const char *extra) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strsnvis, dst, dlen, src, flag, extra);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   int len = REAL(strsnvis)(dst, dlen, src, flag, extra);
   // The interface will be valid even if there is no space for NULL char
   if (dst && len >= 0)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, len + 1);
   return len;
 }
 INTERCEPTOR(int, strsvisx, char *dst, const char *src, SIZE_T len, int flag,
             const char *extra) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strsvisx, dst, src, len, flag, extra);
   if (src)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, src, len);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   int ret = REAL(strsvisx)(dst, src, len, flag, extra);
   if (dst)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   return ret;
 }
 INTERCEPTOR(int, strsnvisx, char *dst, SIZE_T dlen, const char *src, SIZE_T len,
             int flag, const char *extra) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strsnvisx, dst, dlen, src, len, flag, extra);
   if (src)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, src, len);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   int ret = REAL(strsnvisx)(dst, dlen, src, len, flag, extra);
   if (dst && ret >= 0)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   return ret;
 }
 INTERCEPTOR(int, strsenvisx, char *dst, SIZE_T dlen, const char *src,
             SIZE_T len, int flag, const char *extra, int *cerr_ptr) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strsenvisx, dst, dlen, src, len, flag, extra,
                            cerr_ptr);
   if (src)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, src, len);
   if (extra)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, REAL(strlen)(extra) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, extra, internal_strlen(extra) + 1);
   // FIXME: only need to be checked when "flag | VIS_NOLOCALE" doesn't hold
   // according to the implementation
   if (cerr_ptr)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, cerr_ptr, sizeof(int));
   int ret = REAL(strsenvisx)(dst, dlen, src, len, flag, extra, cerr_ptr);
   if (dst && ret >= 0)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   if (cerr_ptr)
if (ret == unvis_valid || ret == unvis_validpush) {
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, cp, sizeof(*cp));
   }
   return ret;
 }
 INTERCEPTOR(int, strunvis, char *dst, const char *src) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strunvis, dst, src);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int ret = REAL(strunvis)(dst, src);
   if (ret != -1)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   return ret;
 }
 INTERCEPTOR(int, strnunvis, char *dst, SIZE_T dlen, const char *src) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strnunvis, dst, dlen, src);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int ret = REAL(strnunvis)(dst, dlen, src);
   if (ret != -1)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   return ret;
 }
 INTERCEPTOR(int, strunvisx, char *dst, const char *src, int flag) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strunvisx, dst, src, flag);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int ret = REAL(strunvisx)(dst, src, flag);
   if (ret != -1)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   return ret;
 }
 INTERCEPTOR(int, strnunvisx, char *dst, SIZE_T dlen, const char *src,
             int flag) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strnunvisx, dst, dlen, src, flag);
   if (src)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, REAL(strlen)(src) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, src, internal_strlen(src) + 1);
   int ret = REAL(strnunvisx)(dst, dlen, src, flag);
   if (ret != -1)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, ret + 1);
   return ret;
 }
 #define INIT_VIS                                                               \
   COMMON_INTERCEPT_FUNCTION(vis);                                              \
   COMMON_INTERCEPT_FUNCTION(nvis);                                             \

 #define INIT_VIS
 #endif
 
 #if SANITIZER_INTERCEPT_CDB
 INTERCEPTOR(struct __sanitizer_cdbr *, cdbr_open, const char *path, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, cdbr_open, path, flags);
   if (path)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   struct __sanitizer_cdbr *cdbr = REAL(cdbr_open)(path, flags);
   if (cdbr)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, cdbr, sizeof(*cdbr));
   return cdbr;
 }
 
 INTERCEPTOR(struct __sanitizer_cdbr *, cdbr_open_mem, void *base, SIZE_T size,
   int flags, void (*unmap)(void *, void *, SIZE_T), void *cookie) {
if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, struct_fstab_sz);
   return ret;
 }
 
 INTERCEPTOR(void *, getfsspec, const char *spec) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getfsspec, spec);
   if (spec)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, spec, REAL(strlen)(spec) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, spec, internal_strlen(spec) + 1);
   void *ret = REAL(getfsspec)(spec);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, struct_fstab_sz);
   return ret;
 }
 
 INTERCEPTOR(void *, getfsfile, const char *file) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getfsfile, file);
   if (file)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, file, REAL(strlen)(file) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, file, internal_strlen(file) + 1);
   void *ret = REAL(getfsfile)(file);
   if (ret)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, struct_fstab_sz);
   return ret;
 }
 
 #define INIT_GETFSENT \
   COMMON_INTERCEPT_FUNCTION(getfsent); \

 #define INIT_ARC4RANDOM
 #endif
 
 #if SANITIZER_INTERCEPT_POPEN
 INTERCEPTOR(__sanitizer_FILE *, popen, const char *command, const char *type) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, popen, command, type);
   if (command)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, command, REAL(strlen)(command) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, command, internal_strlen(command) + 1);
   if (type)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, type, REAL(strlen)(type) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, type, internal_strlen(type) + 1);
   __sanitizer_FILE *res = REAL(popen)(command, type);
   COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, nullptr);
   if (res) unpoison_file(res);
   return res;
 }
 #define INIT_POPEN COMMON_INTERCEPT_FUNCTION(popen)
 #else
 #define INIT_POPEN
 #endif
 
 #if SANITIZER_INTERCEPT_POPENVE
 INTERCEPTOR(__sanitizer_FILE *, popenve, const char *path,
             char *const *argv, char *const *envp, const char *type) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, popenve, path, argv, envp, type);
   if (path)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   if (argv) {
     for (char *const *pa = argv; ; ++pa) {
       COMMON_INTERCEPTOR_READ_RANGE(ctx, pa, sizeof(char **));
       if (!*pa)
         break;
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, REAL(strlen)(*pa) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, internal_strlen(*pa) + 1);
     }
   }
   if (envp) {
     for (char *const *pa = envp; ; ++pa) {
       COMMON_INTERCEPTOR_READ_RANGE(ctx, pa, sizeof(char **));
       if (!*pa)
         break;
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, REAL(strlen)(*pa) + 1);
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, internal_strlen(*pa) + 1);
     }
   }
   if (type)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, type, REAL(strlen)(type) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, type, internal_strlen(type) + 1);
   __sanitizer_FILE *res = REAL(popenve)(path, argv, envp, type);
   COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, nullptr);
   if (res) unpoison_file(res);
   return res;
 }
 #define INIT_POPENVE COMMON_INTERCEPT_FUNCTION(popenve)
 #else
 #define INIT_POPENVE

 
 #if SANITIZER_INTERCEPT_FDEVNAME
 INTERCEPTOR(char *, fdevname,  int fd) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fdevname, fd);
   COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd);
   char *name = REAL(fdevname)(fd);
   if (name) {
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, REAL(strlen)(name) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, name, internal_strlen(name) + 1);
     if (fd > 0)
       COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd);
   }
   return name;
 }
 
 INTERCEPTOR(char *, fdevname_r,  int fd, char *buf, SIZE_T len) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fdevname_r, fd, buf, len);
   COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd);
   char *name = REAL(fdevname_r)(fd, buf, len);
   if (name && buf && len > 0) {
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, REAL(strlen)(buf) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, internal_strlen(buf) + 1);
     if (fd > 0)
       COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd);
   }
   return name;
 }
 
 #define INIT_FDEVNAME \
   COMMON_INTERCEPT_FUNCTION(fdevname); \
   COMMON_INTERCEPT_FUNCTION(fdevname_r);
 #else
 #define INIT_FDEVNAME
 #endif
 
 #if SANITIZER_INTERCEPT_GETUSERSHELL
 INTERCEPTOR(char *, getusershell) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getusershell);
   char *res = REAL(getusershell)();
   if (res)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 
 #define INIT_GETUSERSHELL COMMON_INTERCEPT_FUNCTION(getusershell);
 #else
 #define INIT_GETUSERSHELL
 #endif
 
 #if SANITIZER_INTERCEPT_SL_INIT
 INTERCEPTOR(void *, sl_init) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sl_init);
   void *res = REAL(sl_init)();
   if (res)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, __sanitizer::struct_StringList_sz);
   return res;
 }
 
 INTERCEPTOR(int, sl_add, void *sl, char *item) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sl_add, sl, item);
   if (sl)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, sl, __sanitizer::struct_StringList_sz);
   if (item)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, item, REAL(strlen)(item) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, item, internal_strlen(item) + 1);
   int res = REAL(sl_add)(sl, item);
   if (!res)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, sl, __sanitizer::struct_StringList_sz);
   return res;
 }
 
 INTERCEPTOR(char *, sl_find, void *sl, const char *item) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sl_find, sl, item);
   if (sl)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, sl, __sanitizer::struct_StringList_sz);
   if (item)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, item, REAL(strlen)(item) + 1);
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, item, internal_strlen(item) + 1);
   char *res = REAL(sl_find)(sl, item);
   if (res)
-    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, REAL(strlen)(res) + 1);
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, res, internal_strlen(res) + 1);
   return res;
 }
 
 INTERCEPTOR(void, sl_free, void *sl, int freeall) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, sl_free, sl, freeall);
   if (sl)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, sl, __sanitizer::struct_StringList_sz);

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors_netbsd_compat.inc

 #undef getmntinfo
 #undef getvfsstat
 #undef statvfs
 #undef statvfs1
 
 INTERCEPTOR(int, statvfs, char *path, void *buf) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statvfs, path, buf);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(statvfs)(path, buf);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statvfs90_sz);
   return res;
 }
 

 #undef INIT_GETVFSSTAT
 #define INIT_GETVFSSTAT \
   COMMON_INTERCEPT_FUNCTION(getvfsstat); \
   COMMON_INTERCEPT_FUNCTION(__getvfsstat90)
 
 INTERCEPTOR(int, statvfs1, const char *path, void *buf, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, statvfs1, path, buf, flags);
-  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, internal_strlen(path) + 1);
   int res = REAL(statvfs1)(path, buf, flags);
   if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, struct_statvfs90_sz);
   return res;
 }
 
 INTERCEPTOR(int, fstatvfs1, int fd, void *buf, int flags) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, fstatvfs1, fd, buf, flags);

compiler-rt/lib/sanitizer_common/sanitizer_libc.h

 char *internal_strncpy(char *dst, const char *src, uptr n);
 uptr internal_strnlen(const char *s, uptr maxlen);
 char *internal_strrchr(const char *s, int c);
 char *internal_strstr(const char *haystack, const char *needle);
 // Works only for base=10 and doesn't set errno.
 s64 internal_simple_strtoll(const char *nptr, const char **endptr, int base);
 int internal_snprintf(char *buffer, uptr length, const char *format, ...)
     FORMAT(3, 4);
+uptr internal_wcslen(const wchar_t *s);
+uptr internal_wcsnlen(const wchar_t *s, uptr maxlen);
 
 // Return true if all bytes in [mem, mem+size) are zero.
 // Optimized for the case when the result is true.
 bool mem_is_zero(const char *mem, uptr size);
 
 // I/O
 // Define these as macros so we can use them in linker initialized global
 // structs without dynamic initialization.

compiler-rt/lib/sanitizer_common/sanitizer_libc.cpp

s64 internal_simple_strtoll(const char *nptr, const char **endptr, int base) {
   }
   if (sgn > 0) {
     return (s64)(Min((u64)INT64_MAX, res));
   } else {
     return (res > INT64_MAX) ? INT64_MIN : ((s64)res * -1);
   }
 }
 
+uptr internal_wcslen(const wchar_t *s) {
+  uptr i = 0;
+  while (s[i]) i++;
+  return i;
+}
+
+uptr internal_wcsnlen(const wchar_t *s, uptr maxlen) {
+  uptr i = 0;
+  while (i < maxlen && s[i]) i++;
+  return i;
+}
+
 bool mem_is_zero(const char *beg, uptr size) {
   CHECK_LE(size, 1ULL << FIRST_32_SECOND_64(30, 40));  // Sanity check.
   const char *end = beg + size;
   uptr *aligned_beg = (uptr *)RoundUpTo((uptr)beg, sizeof(uptr));
   uptr *aligned_end = (uptr *)RoundDownTo((uptr)end, sizeof(uptr));
   uptr all = 0;
   // Prologue.
   for (const char *mem = beg; mem < (char*)aligned_beg && mem < end; mem++)

compiler-rt/lib/sanitizer_common/tests/sanitizer_libc_test.cpp

 //===-- sanitizer_libc_test.cpp -------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // Tests for sanitizer_libc.h.
 //===----------------------------------------------------------------------===//
 #include <algorithm>
 #include <vector>
 #include <stdio.h>
 
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_file.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_platform.h"
 #include "gtest/gtest.h"
TEST(SanitizerCommon, InternalStrFunctions) {
   EXPECT_EQ(retval, (uptr)6);
 
   retval = internal_strlcat(dcatbuf, "123", kStrlcpyBufSize);
   EXPECT_EQ(internal_strcmp(dcatbuf, "1231231"), 0);
   EXPECT_EQ(internal_strlen(dcatbuf), (uptr)7);
   EXPECT_EQ(retval, (uptr)9);
 }
 
+TEST(SanitizerCommon, InternalWideStringFunctions) {
+  const wchar_t *emptystr = L"";
+  const wchar_t *samesizestr = L"1234567";
+  const wchar_t *shortstr = L"123";
+  const wchar_t *longerstr = L"123456789";
+
+  ASSERT_EQ(internal_wcslen(emptystr), 0ul);
+  ASSERT_EQ(internal_wcslen(samesizestr), 7ul);
+  ASSERT_EQ(internal_wcslen(shortstr), 3ul);
+  ASSERT_EQ(internal_wcslen(longerstr), 9ul);
+
+  ASSERT_EQ(internal_wcsnlen(emptystr, 7), 0ul);
+  ASSERT_EQ(internal_wcsnlen(samesizestr, 7), 7ul);
+  ASSERT_EQ(internal_wcsnlen(shortstr, 7), 3ul);
+  ASSERT_EQ(internal_wcsnlen(longerstr, 7), 7ul);
+}
+
 // FIXME: File manipulations are not yet supported on Windows
 #if SANITIZER_POSIX && !SANITIZER_MAC
 TEST(SanitizerCommon, InternalMmapWithOffset) {
   char tmpfile[128];
   temp_file_name(tmpfile, sizeof(tmpfile),
                  "sanitizer_common.internalmmapwithoffset.tmp.");
   fd_t fd = OpenFile(tmpfile, RdWr);
   ASSERT_NE(fd, kInvalidFd);