Vendor import of compiler-rt trunk r303571:vendor/compiler-rt/compiler-rt-trunk-r303571

https://llvm.org/svn/llvm-project/compiler-rt/trunk@303571

29 files changed, 174 insertions, 219 deletions

diff --git a/include/xray/xray_interface.h b/include/xray/xray_interface.h
index c3833f0be357..dc0c277aa841 100644
--- a/include/xray/xray_interface.h
+++ b/include/xray/xray_interface.h
@@ -69,6 +69,10 @@ extern int __xray_remove_handler_arg1();
 /// Provide a function to invoke when XRay encounters a custom event.
 extern int __xray_set_customevent_handler(void (*entry)(void*, std::size_t));
 
+/// This removes whatever the currently provided custom event handler is.
+/// Returns 1 on success, 0 on error.
+extern int __xray_remove_customevent_handler();
+
 enum XRayPatchingStatus {
   NOT_INITIALIZED = 0,
   SUCCESS = 1,
diff --git a/lib/asan/asan_flags.cc b/lib/asan/asan_flags.cc
index 6be0d6e94b9a..c8ae3faed7c2 100644
--- a/lib/asan/asan_flags.cc
+++ b/lib/asan/asan_flags.cc
@@ -194,10 +194,6 @@ void InitializeFlags() {
     Report("WARNING: strchr* interceptors are enabled even though "
            "replace_str=0. Use intercept_strchr=0 to disable them.");
   }
-  if (!f->replace_str && common_flags()->intercept_strndup) {
-    Report("WARNING: strndup* interceptors are enabled even though "
-           "replace_str=0. Use intercept_strndup=0 to disable them.");
-  }
 }
 
 }  // namespace __asan
diff --git a/lib/asan/tests/asan_str_test.cc b/lib/asan/tests/asan_str_test.cc
index 8f4911fd9ff8..c790088f8f9e 100644
--- a/lib/asan/tests/asan_str_test.cc
+++ b/lib/asan/tests/asan_str_test.cc
@@ -154,27 +154,6 @@ TEST(AddressSanitizer, MAYBE_StrDupOOBTest) {
   free(str);
 }
 
-#if SANITIZER_TEST_HAS_STRNDUP
-TEST(AddressSanitizer, MAYBE_StrNDupOOBTest) {
-  size_t size = Ident(42);
-  char *str = MallocAndMemsetString(size);
-  char *new_str;
-  // Normal strndup calls.
-  str[size - 1] = '\0';
-  new_str = strndup(str, size - 13);
-  free(new_str);
-  new_str = strndup(str + size - 1, 13);
-  free(new_str);
-  // Argument points to not allocated memory.
-  EXPECT_DEATH(Ident(strndup(str - 1, 13)), LeftOOBReadMessage(1));
-  EXPECT_DEATH(Ident(strndup(str + size, 13)), RightOOBReadMessage(0));
-  // Overwrite the terminating '\0' and hit unallocated memory.
-  str[size - 1] = 'z';
-  EXPECT_DEATH(Ident(strndup(str, size + 13)), RightOOBReadMessage(0));
-  free(str);
-}
-#endif // SANITIZER_TEST_HAS_STRNDUP
-
 TEST(AddressSanitizer, StrCpyOOBTest) {
   size_t to_size = Ident(30);
   size_t from_size = Ident(6);  // less than to_size
diff --git a/lib/lsan/lsan_common_mac.cc b/lib/lsan/lsan_common_mac.cc
index 5ee1e228691a..ae10955439c8 100644
--- a/lib/lsan/lsan_common_mac.cc
+++ b/lib/lsan/lsan_common_mac.cc
@@ -110,7 +110,8 @@ void ProcessGlobalRegions(Frontier *frontier) {
 
     for (const __sanitizer::LoadedModule::AddressRange &range :
          modules[i].ranges()) {
-      if (range.executable || !range.readable) continue;
+      // Sections storing global variables are writable and non-executable
+      if (range.executable || !range.writable) continue;
 
       ScanGlobalRange(range.beg, range.end, frontier);
     }
diff --git a/lib/msan/msan_interceptors.cc b/lib/msan/msan_interceptors.cc
index 0f50693441be..15543bd912d6 100644
--- a/lib/msan/msan_interceptors.cc
+++ b/lib/msan/msan_interceptors.cc
@@ -341,6 +341,33 @@ INTERCEPTOR(char *, __strdup, char *src) {
 #define MSAN_MAYBE_INTERCEPT___STRDUP
 #endif
 
+INTERCEPTOR(char *, strndup, char *src, SIZE_T n) {
+  ENSURE_MSAN_INITED();
+  GET_STORE_STACK_TRACE;
+  // On FreeBSD strndup() leverages strnlen().
+  InterceptorScope interceptor_scope;
+  SIZE_T copy_size = REAL(strnlen)(src, n);
+  char *res = REAL(strndup)(src, n);
+  CopyShadowAndOrigin(res, src, copy_size, &stack);
+  __msan_unpoison(res + copy_size, 1); // \0
+  return res;
+}
+
+#if !SANITIZER_FREEBSD
+INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) {
+  ENSURE_MSAN_INITED();
+  GET_STORE_STACK_TRACE;
+  SIZE_T copy_size = REAL(strnlen)(src, n);
+  char *res = REAL(__strndup)(src, n);
+  CopyShadowAndOrigin(res, src, copy_size, &stack);
+  __msan_unpoison(res + copy_size, 1); // \0
+  return res;
+}
+#define MSAN_MAYBE_INTERCEPT___STRNDUP INTERCEPT_FUNCTION(__strndup)
+#else
+#define MSAN_MAYBE_INTERCEPT___STRNDUP
+#endif
+
 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
   ENSURE_MSAN_INITED();
   char *res = REAL(gcvt)(number, ndigit, buf);
@@ -1344,13 +1371,6 @@ int OnExit() {
     return __msan_memcpy(to, from, size);                   \
   }
 
-#define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size)                    \
-  do {                                                                         \
-    GET_STORE_STACK_TRACE;                                                     \
-    CopyShadowAndOrigin(to, from, size, &stack);                               \
-    __msan_unpoison(to + size, 1);                                             \
-  } while (false)
-
 #include "sanitizer_common/sanitizer_platform_interceptors.h"
 #include "sanitizer_common/sanitizer_common_interceptors.inc"
 
@@ -1518,6 +1538,8 @@ void InitializeInterceptors() {
   INTERCEPT_FUNCTION(stpcpy);  // NOLINT
   INTERCEPT_FUNCTION(strdup);
   MSAN_MAYBE_INTERCEPT___STRDUP;
+  INTERCEPT_FUNCTION(strndup);
+  MSAN_MAYBE_INTERCEPT___STRNDUP;
   INTERCEPT_FUNCTION(strncpy);  // NOLINT
   INTERCEPT_FUNCTION(gcvt);
   INTERCEPT_FUNCTION(strcat);  // NOLINT
diff --git a/lib/msan/tests/msan_test.cc b/lib/msan/tests/msan_test.cc
index 58f695e69e12..c7c91324aa0b 100644
--- a/lib/msan/tests/msan_test.cc
+++ b/lib/msan/tests/msan_test.cc
@@ -1581,8 +1581,7 @@ TEST(MemorySanitizer, strdup) {
 TEST(MemorySanitizer, strndup) {
   char buf[4] = "abc";
   __msan_poison(buf + 2, sizeof(*buf));
-  char *x;
-  EXPECT_UMR(x = strndup(buf, 3));
+  char *x = strndup(buf, 3);
   EXPECT_NOT_POISONED(x[0]);
   EXPECT_NOT_POISONED(x[1]);
   EXPECT_POISONED(x[2]);
@@ -1594,8 +1593,7 @@ TEST(MemorySanitizer, strndup_short) {
   char buf[4] = "abc";
   __msan_poison(buf + 1, sizeof(*buf));
   __msan_poison(buf + 2, sizeof(*buf));
-  char *x;
-  EXPECT_UMR(x = strndup(buf, 2));
+  char *x = strndup(buf, 2);
   EXPECT_NOT_POISONED(x[0]);
   EXPECT_POISONED(x[1]);
   EXPECT_NOT_POISONED(x[2]);
diff --git a/lib/sanitizer_common/sanitizer_common.cc b/lib/sanitizer_common/sanitizer_common.cc
index 471c3ded2115..7e6f8fce76d2 100644
--- a/lib/sanitizer_common/sanitizer_common.cc
+++ b/lib/sanitizer_common/sanitizer_common.cc
@@ -285,9 +285,9 @@ void LoadedModule::clear() {
 }
 
 void LoadedModule::addAddressRange(uptr beg, uptr end, bool executable,
-                                   bool readable) {
+                                   bool writable) {
   void *mem = InternalAlloc(sizeof(AddressRange));
-  AddressRange *r = new(mem) AddressRange(beg, end, executable, readable);
+  AddressRange *r = new(mem) AddressRange(beg, end, executable, writable);
   ranges_.push_back(r);
   if (executable && end > max_executable_address_)
     max_executable_address_ = end;
diff --git a/lib/sanitizer_common/sanitizer_common.h b/lib/sanitizer_common/sanitizer_common.h
index bbe7aebf3279..33e652e6c3df 100644
--- a/lib/sanitizer_common/sanitizer_common.h
+++ b/lib/sanitizer_common/sanitizer_common.h
@@ -717,7 +717,7 @@ class LoadedModule {
   void set(const char *module_name, uptr base_address, ModuleArch arch,
            u8 uuid[kModuleUUIDSize], bool instrumented);
   void clear();
-  void addAddressRange(uptr beg, uptr end, bool executable, bool readable);
+  void addAddressRange(uptr beg, uptr end, bool executable, bool writable);
   bool containsAddress(uptr address) const;
 
   const char *full_name() const { return full_name_; }
@@ -732,14 +732,14 @@ class LoadedModule {
     uptr beg;
     uptr end;
     bool executable;
-    bool readable;
+    bool writable;
 
-    AddressRange(uptr beg, uptr end, bool executable, bool readable)
+    AddressRange(uptr beg, uptr end, bool executable, bool writable)
         : next(nullptr),
           beg(beg),
           end(end),
           executable(executable),
-          readable(readable) {}
+          writable(writable) {}
   };
 
   const IntrusiveList<AddressRange> &ranges() const { return ranges_; }
diff --git a/lib/sanitizer_common/sanitizer_common_interceptors.inc b/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 3c69726d7c91..53204b48e300 100644
--- a/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -34,8 +34,6 @@
 //   COMMON_INTERCEPTOR_MEMSET_IMPL
 //   COMMON_INTERCEPTOR_MEMMOVE_IMPL
 //   COMMON_INTERCEPTOR_MEMCPY_IMPL
-//   COMMON_INTERCEPTOR_COPY_STRING
-//   COMMON_INTERCEPTOR_STRNDUP_IMPL
 //===----------------------------------------------------------------------===//
 
 #include "interception/interception.h"
@@ -219,25 +217,6 @@ bool PlatformHasDifferentMemcpyAndMemmove();
   }
 #endif
 
-#ifndef COMMON_INTERCEPTOR_COPY_STRING
-#define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) {}
-#endif
-
-#ifndef COMMON_INTERCEPTOR_STRNDUP_IMPL
-#define COMMON_INTERCEPTOR_STRNDUP_IMPL(ctx, s, size)                          \
-  COMMON_INTERCEPTOR_ENTER(ctx, strndup, s, size);                             \
-  uptr from_length = internal_strnlen(s, size);                                \
-  uptr copy_length = Min(size, from_length);                                   \
-  char *new_mem = (char *)WRAP(malloc)(copy_length + 1);                       \
-  if (common_flags()->intercept_strndup) {                                     \
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, s, copy_length + 1);                    \
-  }                                                                            \
-  COMMON_INTERCEPTOR_COPY_STRING(ctx, new_mem, s, copy_length);                \
-  internal_memcpy(new_mem, s, copy_length);                                    \
-  new_mem[copy_length] = '\0';                                                 \
-  return new_mem;
-#endif
-
 struct FileMetadata {
   // For open_memstream().
   char **addr;
@@ -321,26 +300,6 @@ INTERCEPTOR(SIZE_T, strnlen, const char *s, SIZE_T maxlen) {
 #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___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;
@@ -6204,8 +6163,6 @@ static void InitializeCommonInterceptors() {
   INIT_TEXTDOMAIN;
   INIT_STRLEN;
   INIT_STRNLEN;
-  INIT_STRNDUP;
-  INIT___STRNDUP;
   INIT_STRCMP;
   INIT_STRNCMP;
   INIT_STRCASECMP;
diff --git a/lib/sanitizer_common/sanitizer_flag_parser.h b/lib/sanitizer_common/sanitizer_flag_parser.h
index 2477aeddba5f..b6ae307fc93e 100644
--- a/lib/sanitizer_common/sanitizer_flag_parser.h
+++ b/lib/sanitizer_common/sanitizer_flag_parser.h
@@ -34,25 +34,41 @@ class FlagHandler : public FlagHandlerBase {
   bool Parse(const char *value) final;
 };
 
-template <>
-inline bool FlagHandler<bool>::Parse(const char *value) {
+inline bool ParseBool(const char *value, bool *b) {
   if (internal_strcmp(value, "0") == 0 ||
       internal_strcmp(value, "no") == 0 ||
       internal_strcmp(value, "false") == 0) {
-    *t_ = false;
+    *b = false;
     return true;
   }
   if (internal_strcmp(value, "1") == 0 ||
       internal_strcmp(value, "yes") == 0 ||
       internal_strcmp(value, "true") == 0) {
-    *t_ = true;
+    *b = true;
     return true;
   }
+  return false;
+}
+
+template <>
+inline bool FlagHandler<bool>::Parse(const char *value) {
+  if (ParseBool(value, t_)) return true;
   Printf("ERROR: Invalid value for bool option: '%s'\n", value);
   return false;
 }
 
 template <>
+inline bool FlagHandler<HandleSignalMode>::Parse(const char *value) {
+  bool b;
+  if (ParseBool(value, &b)) {
+    *t_ = b ? kHandleSignalYes : kHandleSignalNo;
+    return true;
+  }
+  Printf("ERROR: Invalid value for signal handler option: '%s'\n", value);
+  return false;
+}
+
+template <>
 inline bool FlagHandler<const char *>::Parse(const char *value) {
   *t_ = internal_strdup(value);
   return true;
diff --git a/lib/sanitizer_common/sanitizer_flags.h b/lib/sanitizer_common/sanitizer_flags.h
index 503126bbe256..f22593395ed5 100644
--- a/lib/sanitizer_common/sanitizer_flags.h
+++ b/lib/sanitizer_common/sanitizer_flags.h
@@ -18,6 +18,11 @@
 
 namespace __sanitizer {
 
+enum HandleSignalMode {
+  kHandleSignalNo,
+  kHandleSignalYes,
+};
+
 struct CommonFlags {
 #define COMMON_FLAG(Type, Name, DefaultValue, Description) Type Name;
 #include "sanitizer_flags.inc"
diff --git a/lib/sanitizer_common/sanitizer_flags.inc b/lib/sanitizer_common/sanitizer_flags.inc
index 67a0a5810a28..c5aaf411fcc2 100644
--- a/lib/sanitizer_common/sanitizer_flags.inc
+++ b/lib/sanitizer_common/sanitizer_flags.inc
@@ -78,16 +78,20 @@ COMMON_FLAG(int, print_module_map, 0,
             "OS X only. 0 = don't print, 1 = print only once before process "
             "exits, 2 = print after each report.")
 COMMON_FLAG(bool, check_printf, true, "Check printf arguments.")
-COMMON_FLAG(bool, handle_segv, true,
-            "If set, registers the tool's custom SIGSEGV handler.")
-COMMON_FLAG(bool, handle_sigbus, true,
-            "If set, registers the tool's custom SIGBUS handler.")
-COMMON_FLAG(bool, handle_abort, false,
-            "If set, registers the tool's custom SIGABRT handler.")
-COMMON_FLAG(bool, handle_sigill, false,
-            "If set, registers the tool's custom SIGILL handler.")
-COMMON_FLAG(bool, handle_sigfpe, true,
-            "If set, registers the tool's custom SIGFPE handler.")
+#define COMMON_FLAG_HANDLE_SIGNAL_HELP(signal) \
+    "Controls custom tool's " #signal " handler (0 - do not registers the " \
+    "handler, 1 - register the handler). "
+COMMON_FLAG(HandleSignalMode, handle_segv, kHandleSignalYes,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGSEGV))
+COMMON_FLAG(HandleSignalMode, handle_sigbus, kHandleSignalYes,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGBUS))
+COMMON_FLAG(HandleSignalMode, handle_abort, kHandleSignalNo,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGABRT))
+COMMON_FLAG(HandleSignalMode, handle_sigill, kHandleSignalNo,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGILL))
+COMMON_FLAG(HandleSignalMode, handle_sigfpe, kHandleSignalYes,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGFPE))
+#undef COMMON_FLAG_HANDLE_SIGNAL_HELP
 COMMON_FLAG(bool, allow_user_segv_handler, false,
             "If set, allows user to register a SEGV handler even if the tool "
             "registers one.")
@@ -195,9 +199,6 @@ COMMON_FLAG(bool, intercept_strpbrk, true,
 COMMON_FLAG(bool, intercept_strlen, true,
             "If set, uses custom wrappers for strlen and strnlen functions "
             "to find more errors.")
-COMMON_FLAG(bool, intercept_strndup, true,
-            "If set, uses custom wrappers for strndup functions "
-            "to find more errors.")
 COMMON_FLAG(bool, intercept_strchr, true,
             "If set, uses custom wrappers for strchr, strchrnul, and strrchr "
             "functions to find more errors.")
diff --git a/lib/sanitizer_common/sanitizer_linux.cc b/lib/sanitizer_common/sanitizer_linux.cc
index fce78fe590d5..87f32c44d71a 100644
--- a/lib/sanitizer_common/sanitizer_linux.cc
+++ b/lib/sanitizer_common/sanitizer_linux.cc
@@ -1395,15 +1395,19 @@ AndroidApiLevel AndroidGetApiLevel() {
 #endif
 
 bool IsHandledDeadlySignal(int signum) {
-  if (common_flags()->handle_abort && signum == SIGABRT)
-    return true;
-  if (common_flags()->handle_sigill && signum == SIGILL)
-    return true;
-  if (common_flags()->handle_sigfpe && signum == SIGFPE)
-    return true;
-  if (common_flags()->handle_segv && signum == SIGSEGV)
-    return true;
-  return common_flags()->handle_sigbus && signum == SIGBUS;
+  switch (signum) {
+    case SIGABRT:
+      return common_flags()->handle_abort;
+    case SIGILL:
+      return common_flags()->handle_sigill;
+    case SIGFPE:
+      return common_flags()->handle_sigfpe;
+    case SIGSEGV:
+      return common_flags()->handle_segv;
+    case SIGBUS:
+      return common_flags()->handle_sigbus;
+  }
+  return false;
 }
 
 #if !SANITIZER_GO
diff --git a/lib/sanitizer_common/sanitizer_linux_libcdep.cc b/lib/sanitizer_common/sanitizer_linux_libcdep.cc
index 25f1e12c0374..a15b5858af40 100644
--- a/lib/sanitizer_common/sanitizer_linux_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -447,9 +447,9 @@ static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
       uptr cur_beg = info->dlpi_addr + phdr->p_vaddr;
       uptr cur_end = cur_beg + phdr->p_memsz;
       bool executable = phdr->p_flags & PF_X;
-      bool readable = phdr->p_flags & PF_R;
+      bool writable = phdr->p_flags & PF_W;
       cur_module.addAddressRange(cur_beg, cur_end, executable,
-                                 readable);
+                                 writable);
     }
   }
   data->modules->push_back(cur_module);
diff --git a/lib/sanitizer_common/sanitizer_mac.cc b/lib/sanitizer_common/sanitizer_mac.cc
index 2f990b805ff9..f1a6bf91635c 100644
--- a/lib/sanitizer_common/sanitizer_mac.cc
+++ b/lib/sanitizer_common/sanitizer_mac.cc
@@ -394,18 +394,22 @@ void ListOfModules::init() {
 }
 
 bool IsHandledDeadlySignal(int signum) {
+  // Handling fatal signals on watchOS and tvOS devices is disallowed.
   if ((SANITIZER_WATCHOS || SANITIZER_TVOS) && !(SANITIZER_IOSSIM))
-    // Handling fatal signals on watchOS and tvOS devices is disallowed.
     return false;
-  if (common_flags()->handle_abort && signum == SIGABRT)
-    return true;
-  if (common_flags()->handle_sigill && signum == SIGILL)
-    return true;
-  if (common_flags()->handle_sigfpe && signum == SIGFPE)
-    return true;
-  if (common_flags()->handle_segv && signum == SIGSEGV)
-    return true;
-  return common_flags()->handle_sigbus && signum == SIGBUS;
+  switch (signum) {
+    case SIGABRT:
+      return common_flags()->handle_abort;
+    case SIGILL:
+      return common_flags()->handle_sigill;
+    case SIGFPE:
+      return common_flags()->handle_sigfpe;
+    case SIGSEGV:
+      return common_flags()->handle_segv;
+    case SIGBUS:
+      return common_flags()->handle_sigbus;
+  }
+  return false;
 }
 
 MacosVersion cached_macos_version = MACOS_VERSION_UNINITIALIZED;
diff --git a/lib/sanitizer_common/sanitizer_platform_interceptors.h b/lib/sanitizer_common/sanitizer_platform_interceptors.h
index a95497467d61..e5644ef25e83 100644
--- a/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ b/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -25,12 +25,6 @@
 # define SI_NOT_WINDOWS 0
 #endif
 
-#if SANITIZER_POSIX
-# define SI_POSIX 1
-#else
-# define SI_POSIX 0
-#endif
-
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
 # define SI_LINUX_NOT_ANDROID 1
 #else
@@ -75,12 +69,6 @@
 # define SI_UNIX_NOT_MAC 0
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_FREEBSD
-# define SI_LINUX_NOT_FREEBSD 1
-# else
-# define SI_LINUX_NOT_FREEBSD 0
-#endif
-
 #define SANITIZER_INTERCEPT_STRLEN 1
 #define SANITIZER_INTERCEPT_STRNLEN SI_NOT_MAC
 #define SANITIZER_INTERCEPT_STRCMP 1
@@ -98,8 +86,6 @@
 #define SANITIZER_INTERCEPT_MEMMOVE 1
 #define SANITIZER_INTERCEPT_MEMCPY 1
 #define SANITIZER_INTERCEPT_MEMCMP 1
-#define SANITIZER_INTERCEPT_STRNDUP SI_POSIX
-#define SANITIZER_INTERCEPT___STRNDUP SI_LINUX_NOT_FREEBSD
 #if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \
     __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070
 # define SI_MAC_DEPLOYMENT_BELOW_10_7 1
diff --git a/lib/sanitizer_common/sanitizer_procmaps_common.cc b/lib/sanitizer_common/sanitizer_procmaps_common.cc
index 67a659010aaf..c583f42f25d8 100644
--- a/lib/sanitizer_common/sanitizer_procmaps_common.cc
+++ b/lib/sanitizer_common/sanitizer_procmaps_common.cc
@@ -142,7 +142,7 @@ void MemoryMappingLayout::DumpListOfModules(
     LoadedModule cur_module;
     cur_module.set(cur_name, base_address);
     cur_module.addAddressRange(cur_beg, cur_end, prot & kProtectionExecute,
-                               prot & kProtectionRead);
+                               prot & kProtectionWrite);
     modules->push_back(cur_module);
   }
 }
diff --git a/lib/sanitizer_common/sanitizer_procmaps_mac.cc b/lib/sanitizer_common/sanitizer_procmaps_mac.cc
index 0b4171a90f60..131017458d4c 100644
--- a/lib/sanitizer_common/sanitizer_procmaps_mac.cc
+++ b/lib/sanitizer_common/sanitizer_procmaps_mac.cc
@@ -336,7 +336,7 @@ void MemoryMappingLayout::DumpListOfModules(
                       current_instrumented_);
     }
     cur_module->addAddressRange(cur_beg, cur_end, prot & kProtectionExecute,
-                                prot & kProtectionRead);
+                                prot & kProtectionWrite);
   }
 }
 
diff --git a/lib/sanitizer_common/sanitizer_win.cc b/lib/sanitizer_common/sanitizer_win.cc
index 1a454ba42c8e..d0a5c078cd68 100644
--- a/lib/sanitizer_common/sanitizer_win.cc
+++ b/lib/sanitizer_common/sanitizer_win.cc
@@ -554,7 +554,7 @@ void ListOfModules::init() {
     cur_module.set(module_name, adjusted_base);
     // We add the whole module as one single address range.
     cur_module.addAddressRange(base_address, end_address, /*executable*/ true,
-                               /*readable*/ true);
+                               /*writable*/ true);
     modules_.push_back(cur_module);
   }
   UnmapOrDie(hmodules, modules_buffer_size);
diff --git a/lib/sanitizer_common/tests/CMakeLists.txt b/lib/sanitizer_common/tests/CMakeLists.txt
index b310f93743ac..2acedd0ef56a 100644
--- a/lib/sanitizer_common/tests/CMakeLists.txt
+++ b/lib/sanitizer_common/tests/CMakeLists.txt
@@ -146,6 +146,15 @@ set_target_properties(SanitizerUnitTests PROPERTIES FOLDER "Compiler-RT Tests")
 # Adds sanitizer tests for architecture.
 macro(add_sanitizer_tests_for_arch arch)
   get_target_flags_for_arch(${arch} TARGET_FLAGS)
+
+  # If the sanitizer library was built with _FILE_OFFSET_BITS=64 we need
+  # to ensure that the library and tests agree on the layout of certain
+  # structures such as 'struct stat'.
+  if( CMAKE_SIZEOF_VOID_P EQUAL 4 )
+    list(APPEND TARGET_FLAGS "-D_LARGEFILE_SOURCE")
+    list(APPEND TARGET_FLAGS "-D_FILE_OFFSET_BITS=64")
+  endif()
+
   set(SANITIZER_TEST_SOURCES ${SANITIZER_UNITTESTS}
                              ${COMPILER_RT_GTEST_SOURCE})
   set(SANITIZER_TEST_COMPILE_DEPS ${SANITIZER_TEST_HEADERS})
diff --git a/lib/sanitizer_common/tests/sanitizer_flags_test.cc b/lib/sanitizer_common/tests/sanitizer_flags_test.cc
index 24a3f3d3c7eb..34d7067f85ff 100644
--- a/lib/sanitizer_common/tests/sanitizer_flags_test.cc
+++ b/lib/sanitizer_common/tests/sanitizer_flags_test.cc
@@ -59,6 +59,36 @@ TEST(SanitizerCommon, BooleanFlags) {
   TestFlag(true, "flag_name=0", false);
   TestFlag(true, "flag_name=no", false);
   TestFlag(true, "flag_name=false", false);
+
+  EXPECT_DEATH(TestFlag(false, "flag_name", true), "expected '='");
+  EXPECT_DEATH(TestFlag(false, "flag_name=", true),
+               "Invalid value for bool option: ''");
+  EXPECT_DEATH(TestFlag(false, "flag_name=2", true),
+               "Invalid value for bool option: '2'");
+  EXPECT_DEATH(TestFlag(false, "flag_name=-1", true),
+               "Invalid value for bool option: '-1'");
+  EXPECT_DEATH(TestFlag(false, "flag_name=on", true),
+               "Invalid value for bool option: 'on'");
+}
+
+TEST(SanitizerCommon, HandleSignalMode) {
+  TestFlag(kHandleSignalNo, "flag_name=1", kHandleSignalYes);
+  TestFlag(kHandleSignalNo, "flag_name=yes", kHandleSignalYes);
+  TestFlag(kHandleSignalNo, "flag_name=true", kHandleSignalYes);
+  TestFlag(kHandleSignalYes, "flag_name=0", kHandleSignalNo);
+  TestFlag(kHandleSignalYes, "flag_name=no", kHandleSignalNo);
+  TestFlag(kHandleSignalYes, "flag_name=false", kHandleSignalNo);
+
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name", kHandleSignalNo),
+               "expected '='");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=", kHandleSignalNo),
+               "Invalid value for signal handler option: ''");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=2", kHandleSignalNo),
+               "Invalid value for signal handler option: '2'");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=-1", kHandleSignalNo),
+               "Invalid value for signal handler option: '-1'");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=on", kHandleSignalNo),
+               "Invalid value for signal handler option: 'on'");
 }
 
 TEST(SanitizerCommon, IntFlags) {
diff --git a/lib/sanitizer_common/tests/sanitizer_test_utils.h b/lib/sanitizer_common/tests/sanitizer_test_utils.h
index b7728d9ea25e..9c162a66f547 100644
--- a/lib/sanitizer_common/tests/sanitizer_test_utils.h
+++ b/lib/sanitizer_common/tests/sanitizer_test_utils.h
@@ -124,10 +124,4 @@ static inline uint32_t my_rand() {
 # define SANITIZER_TEST_HAS_PRINTF_L 0
 #endif
 
-#if !defined(_MSC_VER)
-# define SANITIZER_TEST_HAS_STRNDUP 1
-#else
-# define SANITIZER_TEST_HAS_STRNDUP 0
-#endif
-
 #endif  // SANITIZER_TEST_UTILS_H
diff --git a/lib/scudo/scudo_flags.cpp b/lib/scudo/scudo_flags.cpp
index 64da1d9d8ec1..90f0cbf4bb86 100644
--- a/lib/scudo/scudo_flags.cpp
+++ b/lib/scudo/scudo_flags.cpp
@@ -68,7 +68,7 @@ void initFlags() {
   // Sanity checks and default settings for the Quarantine parameters.
 
   if (f->QuarantineSizeMb < 0) {
-    const int DefaultQuarantineSizeMb = FIRST_32_SECOND_64(16, 64);
+    const int DefaultQuarantineSizeMb = FIRST_32_SECOND_64(4, 16);
     f->QuarantineSizeMb = DefaultQuarantineSizeMb;
   }
   // We enforce an upper limit for the quarantine size of 4Gb.
@@ -77,7 +77,7 @@ void initFlags() {
   }
   if (f->ThreadLocalQuarantineSizeKb < 0) {
     const int DefaultThreadLocalQuarantineSizeKb =
-        FIRST_32_SECOND_64(256, 1024);
+        FIRST_32_SECOND_64(64, 256);
     f->ThreadLocalQuarantineSizeKb = DefaultThreadLocalQuarantineSizeKb;
   }
   // And an upper limit of 128Mb for the thread quarantine cache.
diff --git a/lib/xray/xray_interface.cc b/lib/xray/xray_interface.cc
index c437a72e3f05..e912b6e478a3 100644
--- a/lib/xray/xray_interface.cc
+++ b/lib/xray/xray_interface.cc
@@ -119,10 +119,15 @@ int __xray_set_customevent_handler(void (*entry)(void *, size_t))
   return 0;
 }
 
+
 int __xray_remove_handler() XRAY_NEVER_INSTRUMENT {
   return __xray_set_handler(nullptr);
 }
 
+int __xray_remove_customevent_handler() XRAY_NEVER_INSTRUMENT {
+  return __xray_set_customevent_handler(nullptr);
+}
+
 __sanitizer::atomic_uint8_t XRayPatching{0};
 
 using namespace __xray;
@@ -326,7 +331,14 @@ uintptr_t __xray_function_address(int32_t FuncId) XRAY_NEVER_INSTRUMENT {
   __sanitizer::SpinMutexLock Guard(&XRayInstrMapMutex);
   if (FuncId <= 0 || static_cast<size_t>(FuncId) > XRayInstrMap.Functions)
     return 0;
-  return XRayInstrMap.SledsIndex[FuncId - 1].Begin->Address;
+  return XRayInstrMap.SledsIndex[FuncId - 1].Begin->Address
+// On PPC, function entries are always aligned to 16 bytes. The beginning of a
+// sled might be a local entry, which is always +8 based on the global entry.
+// Always return the global entry.
+#ifdef __PPC__
+         & ~0xf
+#endif
+      ;
 }
 
 size_t __xray_max_function_id() XRAY_NEVER_INSTRUMENT {
diff --git a/test/asan/TestCases/Posix/asan-sigbus.cpp b/test/asan/TestCases/Posix/asan-sigbus.cpp
index a7d032acec03..d02ebbd9d8b0 100644
--- a/test/asan/TestCases/Posix/asan-sigbus.cpp
+++ b/test/asan/TestCases/Posix/asan-sigbus.cpp
@@ -2,7 +2,7 @@
 // Defaults to true
 // RUN: %clangxx_asan -std=c++11 %s -o %t
 // RUN: not %run %t %T/file 2>&1 | FileCheck %s -check-prefix=CHECK-BUS
-// RUN: %env_asan_opts=handle_sigbus=false not --crash %run %t %T/file 2>&1 | FileCheck %s
+// RUN: %env_asan_opts=handle_sigbus=0 not --crash %run %t %T/file 2>&1 | FileCheck %s
 
 // UNSUPPORTED: ios
 
diff --git a/test/asan/TestCases/Posix/strndup_oob_test.cc b/test/asan/TestCases/Posix/strndup_oob_test.cc
deleted file mode 100644
index 7ea0b7a33400..000000000000
--- a/test/asan/TestCases/Posix/strndup_oob_test.cc
+++ /dev/null
@@ -1,27 +0,0 @@
-// RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s
-
-// When built as C on Linux, strndup is transformed to __strndup.
-// RUN: %clangxx_asan -O3 -xc %s -o %t && not %run %t 2>&1 | FileCheck %s
-
-// Unwind problem on arm: "main" is missing from the allocation stack trace.
-// UNSUPPORTED: win32,s390,armv7l-unknown-linux-gnueabihf
-
-#include <string.h>
-
-char kString[] = "foo";
-
-int main(int argc, char **argv) {
-  char *copy = strndup(kString, 2);
-  int x = copy[2 + argc];  // BOOM
-  // CHECK: AddressSanitizer: heap-buffer-overflow
-  // CHECK: #0 {{.*}}main {{.*}}strndup_oob_test.cc:[[@LINE-2]]
-  // CHECK-LABEL: allocated by thread T{{.*}} here:
-  // CHECK: #{{[01]}} {{.*}}strndup
-  // CHECK: #{{.*}}main {{.*}}strndup_oob_test.cc:[[@LINE-6]]
-  // CHECK-LABEL: SUMMARY
-  // CHECK: strndup_oob_test.cc:[[@LINE-7]]
-  return x;
-}
diff --git a/test/msan/strndup.cc b/test/msan/strndup.cc
deleted file mode 100644
index d4b9af1a9a6e..000000000000
--- a/test/msan/strndup.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-// RUN: %clangxx_msan %s -o %t && not %run %t 2>&1 | FileCheck --check-prefix=ON %s
-// RUN: %clangxx_msan %s -o %t && MSAN_OPTIONS=intercept_strndup=0 %run %t 2>&1 | FileCheck --check-prefix=OFF --allow-empty %s
-
-// When built as C on Linux, strndup is transformed to __strndup.
-// RUN: %clangxx_msan -O3 -xc %s -o %t && not %run %t 2>&1 | FileCheck --check-prefix=ON %s
-
-// UNSUPPORTED: win32
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sanitizer/msan_interface.h>
-
-int main(int argc, char **argv) {
-  char kString[4] = "abc";
-  __msan_poison(kString + 2, 1);
-  char *copy = strndup(kString, 4); // BOOM
-  assert(__msan_test_shadow(copy, 4) == 2); // Poisoning is preserved.
-  free(copy);
-  return 0;
-  // ON: Uninitialized bytes in __interceptor_{{(__)?}}strndup at offset 2 inside [{{.*}}, 4)
-  // ON: MemorySanitizer: use-of-uninitialized-value
-  // ON: #0 {{.*}}main {{.*}}strndup.cc:[[@LINE-6]]
-  // ON-LABEL: SUMMARY
-  // ON: {{.*}}strndup.cc:[[@LINE-8]]
-  // OFF-NOT: MemorySanitizer
-}
-
diff --git a/test/xray/TestCases/Linux/custom-event-logging.cc b/test/xray/TestCases/Linux/custom-event-logging.cc
index b1a766d46045..9bb5d44e1111 100644
--- a/test/xray/TestCases/Linux/custom-event-logging.cc
+++ b/test/xray/TestCases/Linux/custom-event-logging.cc
@@ -33,7 +33,7 @@ int main() {
   // CHECK-NEXT: after calling the custom logging...
   printf("removing custom event handler...\n");
   // CHECK-NEXT: removing custom event handler...
-  __xray_set_customevent_handler(nullptr);
+  __xray_remove_customevent_handler();
   foo();
   // CHECK-NEXT: before calling the custom logging...
   // CHECK-NEXT: after calling the custom logging...
diff --git a/test/xray/TestCases/Linux/func-id-utils.cc b/test/xray/TestCases/Linux/func-id-utils.cc
index c9a2952c695d..17185c34c01e 100644
--- a/test/xray/TestCases/Linux/func-id-utils.cc
+++ b/test/xray/TestCases/Linux/func-id-utils.cc
@@ -31,18 +31,10 @@
          "each function id must be assigned to a unique function");
 
   std::set<void *> not_instrumented;
-  const auto comp = [](void *lhs, void *rhs) {
-#ifdef __PPC__
-    return reinterpret_cast<uintptr_t>(lhs) + 8 <
-           reinterpret_cast<uintptr_t>(rhs);
-#else
-    return lhs < rhs;
-#endif
-  };
-  std::set_difference(must_be_instrumented.begin(), must_be_instrumented.end(),
-                      all_instrumented.begin(), all_instrumented.end(),
-                      std::inserter(not_instrumented, not_instrumented.begin()),
-                      comp);
+  std::set_difference(
+      must_be_instrumented.begin(), must_be_instrumented.end(),
+      all_instrumented.begin(), all_instrumented.end(),
+      std::inserter(not_instrumented, not_instrumented.begin()));
   assert(
       not_instrumented.empty() &&
       "we should see all explicitly instrumented functions with function ids");