Fix asan false-positive errors: (#15563)

- Call __asan_handle_no_return in RtlRestoreContext if it doesn't return
  and in ThrowExceptionFromContextInternal function;

- Increase alternate signal stack size and use it also for asan.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/pal/src/exception/signal.cpp b/src/pal/src/exception/signal.cpp
index 012e320338..a27382315c 100644
--- a/src/pal/src/exception/signal.cpp
+++ b/src/pal/src/exception/signal.cpp
@@ -153,6 +153,11 @@ BOOL EnsureSignalAlternateStack()
         // We include the size of the SignalHandlerWorkerReturnPoint in the alternate stack size since the 
         // context contained in it is large and the SIGSTKSZ was not sufficient on ARM64 during testing.
         int altStackSize = SIGSTKSZ + ALIGN_UP(sizeof(SignalHandlerWorkerReturnPoint), 16) + GetVirtualPageSize();
+#ifdef HAS_ASAN
+        // Asan also uses alternate stack so we increase its size on the SIGSTKSZ * 4 that enough for asan
+        // (see kAltStackSize in compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc)
+        altStackSize += SIGSTKSZ * 4;
+#endif
         void* altStack;
         int st = posix_memalign(&altStack, GetVirtualPageSize(), altStackSize);
         if (st == 0)