Explicitly unpoison the result of FD_ZERO

socketft.cpp

@@ -19,6 +19,10 @@
 #include <sys/ioctl.h>
 #endif
 
+#if defined(CRYPTOPP_MSAN)
+# include <sanitizer/msan_interface.h>
+#endif
+
 #ifdef PREFER_WINDOWS_STYLE_SOCKETS
 # pragma comment(lib, "ws2_32.lib")
 #endif
@@ -239,6 +243,10 @@ bool Socket::SendReady(const timeval *timeout)
 	fd_set fds;
 	FD_ZERO(&fds);
 	FD_SET(m_s, &fds);
+#ifdef CRYPTOPP_MSAN
+	__msan_unpoison(&fds, sizeof(fds));
+#endif
+
 	int ready;
 	if (timeout == NULL)
 		ready = select((int)m_s+1, NULL, &fds, NULL, NULL);
@@ -256,6 +264,10 @@ bool Socket::ReceiveReady(const timeval *timeout)
 	fd_set fds;
 	FD_ZERO(&fds);
 	FD_SET(m_s, &fds);
+#ifdef CRYPTOPP_MSAN
+	__msan_unpoison(&fds, sizeof(fds));
+#endif
+	
 	int ready;
 	if (timeout == NULL)
 		ready = select((int)m_s+1, &fds, NULL, NULL, NULL);

wait.cpp

@@ -20,6 +20,10 @@
 #include <unistd.h>
 #endif
 
+#if defined(CRYPTOPP_MSAN)
+# include <sanitizer/msan_interface.h>
+#endif
+
 NAMESPACE_BEGIN(CryptoPP)
 
 unsigned int WaitObjectContainer::MaxWaitObjects()
@@ -47,6 +51,10 @@ void WaitObjectContainer::Clear()
 	m_maxFd = 0;
 	FD_ZERO(&m_readfds);
 	FD_ZERO(&m_writefds);
+# ifdef CRYPTOPP_MSAN
+	__msan_unpoison(&m_readfds, sizeof(m_readfds));
+	__msan_unpoison(&m_writefds, sizeof(m_writefds));
+# endif	
 #endif
 	m_noWait = false;
 	m_firstEventTime = 0;

wait.h

@@ -18,6 +18,12 @@
 
 #include "hrtimer.h"
 
+#if defined(__has_feature)
+# if __has_feature(memory_sanitizer)
+#  define CRYPTOPP_MSAN 1
+# endif
+#endif
+
 NAMESPACE_BEGIN(CryptoPP)
 
 class Tracer