projects/mysql-server/fix.diff

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4a4bbfa72fa..0478561e66c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -688,6 +688,7 @@ IF(WITH_JEMALLOC AND (WITH_TCMALLOC OR WITH_TCMALLOC_DEBUG))
   MESSAGE(FATAL_ERROR "Specify only *one* of WITH_TCMALLOC and WITH_JEMALLOC")
 ENDIF()
 
+OPTION(FUZZING "Fuzzing" OFF)
 OPTION(ENABLED_PROFILING "Enable profiling" ON)
 OPTION(WITHOUT_SERVER OFF)
 
@@ -1804,6 +1805,10 @@ IF(NOT WITHOUT_SERVER AND WITH_UNIT_TESTS)
   ENDIF()
 ENDIF()
 
+IF (FUZZING)
+  ADD_SUBDIRECTORY(fuzz)
+ENDIF()
+
 # scripts/mysql_config depends on client and server targets loaded above.
 # It is referenced by some of the directories below, so we insert it here.
 ADD_SUBDIRECTORY(scripts)
diff --git a/cmake/os/Linux.cmake b/cmake/os/Linux.cmake
index 0e25e8eb..3ae74839 100644
--- a/cmake/os/Linux.cmake
+++ b/cmake/os/Linux.cmake
@@ -103,7 +103,8 @@ IF(NOT WITH_ASAN AND
    NOT WITH_LSAN AND
    NOT WITH_MSAN AND
    NOT WITH_TSAN AND
-   NOT WITH_UBSAN)
+   NOT WITH_UBSAN AND
+   NOT FUZZING)
   SET(LINK_FLAG_NO_UNDEFINED "-Wl,--no-undefined")
   SET(LINK_FLAG_Z_DEFS "-z,defs")
 ENDIF()
diff --git a/include/mysql.h b/include/mysql.h
index 4700d74b853..bdf9b765ffb 100644
--- a/include/mysql.h
+++ b/include/mysql.h
@@ -262,7 +262,8 @@ enum mysql_protocol_type {
   MYSQL_PROTOCOL_TCP,
   MYSQL_PROTOCOL_SOCKET,
   MYSQL_PROTOCOL_PIPE,
-  MYSQL_PROTOCOL_MEMORY
+  MYSQL_PROTOCOL_MEMORY,
+  MYSQL_PROTOCOL_FUZZ
 };
 
 enum mysql_ssl_mode {
diff --git a/include/mysql.h.pp b/include/mysql.h.pp
index 39ebd0fcb93..c041cc4690f 100644
--- a/include/mysql.h.pp
+++ b/include/mysql.h.pp
@@ -486,7 +486,8 @@ enum mysql_protocol_type {
   MYSQL_PROTOCOL_TCP,
   MYSQL_PROTOCOL_SOCKET,
   MYSQL_PROTOCOL_PIPE,
-  MYSQL_PROTOCOL_MEMORY
+  MYSQL_PROTOCOL_MEMORY,
+  MYSQL_PROTOCOL_FUZZ
 };
 enum mysql_ssl_mode {
   SSL_MODE_DISABLED = 1,
diff --git a/include/violite.h b/include/violite.h
index a6ccd1a607d..8dc0d46dd7f 100644
--- a/include/violite.h
+++ b/include/violite.h
@@ -108,12 +108,14 @@ enum enum_vio_type : int {
   */
   VIO_TYPE_PLUGIN = 7,
 
+  VIO_TYPE_FUZZ = 8,
+
   FIRST_VIO_TYPE = VIO_TYPE_TCPIP,
   /*
     If a new type is added, please update LAST_VIO_TYPE. In addition, please
     change get_vio_type_name() in vio/vio.c to return correct name for it.
   */
-  LAST_VIO_TYPE = VIO_TYPE_PLUGIN
+  LAST_VIO_TYPE = VIO_TYPE_FUZZ
 };
 
 /**
@@ -444,4 +446,20 @@ struct Vio {
 
 #define SSL_handle SSL *
 
+
+//Vio fuzzing
+bool vio_connect_fuzz(MYSQL_VIO vio, struct sockaddr *addr, socklen_t len,
+                        int timeout);
+int vio_socket_timeout_fuzz(Vio *vio, uint which, bool b);
+void sock_initfuzz(const uint8_t *Data, size_t Size);
+size_t vio_read_buff_fuzz(Vio *vio, uchar *buf, size_t size);
+size_t vio_write_buff_fuzz(Vio *vio, const uchar *buf, size_t size);
+bool vio_is_connected_fuzz(Vio *vio);
+bool vio_was_timeout_fuzz(Vio *vio);
+int vio_shutdown_fuzz(Vio *vio);
+int vio_keepalive_fuzz(Vio *vio, bool set_keep_alive);
+int vio_io_wait_fuzz(Vio *vio, enum enum_vio_io_event event, int timeout);
+int vio_fastsend_fuzz(Vio *vio);
+bool vio_should_retry_fuzz(Vio *vio);
+
 #endif /* vio_violite_h_ */
diff --git a/libmysql/CMakeLists.txt b/libmysql/CMakeLists.txt
index 334d1b7d3ef..c37c5ad930e 100644
--- a/libmysql/CMakeLists.txt
+++ b/libmysql/CMakeLists.txt
@@ -345,11 +345,11 @@ IF(LINUX_STANDALONE AND KERBEROS_CUSTOM_LIBRARY)
 ENDIF()
 
 IF(UNIX)
-  IF(LINK_FLAG_Z_DEFS)
+  IF(LINK_FLAG_Z_DEFS AND NOT FUZZING)
     MY_TARGET_LINK_OPTIONS(libmysql "LINKER:${LINK_FLAG_Z_DEFS}")
   ENDIF()
 
-  IF(LINUX)
+  IF(LINUX AND NOT FUZZING)
     CONFIGURE_FILE(libmysql.ver.in ${CMAKE_CURRENT_BINARY_DIR}/libmysql.ver)
     MY_TARGET_LINK_OPTIONS(libmysql
       "LINKER:--version-script=${CMAKE_CURRENT_BINARY_DIR}/libmysql.ver")
diff --git a/mysys/my_rnd.cc b/mysys/my_rnd.cc
index 2fc7820eaa3..248ea909db8 100644
--- a/mysys/my_rnd.cc
+++ b/mysys/my_rnd.cc
@@ -48,6 +48,9 @@
 */
 
 double my_rnd(struct rand_struct *rand_st) {
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    return 65.43;
+#endif
   rand_st->seed1 = (rand_st->seed1 * 3 + rand_st->seed2) % rand_st->max_value;
   rand_st->seed2 = (rand_st->seed1 + rand_st->seed2 + 33) % rand_st->max_value;
   return (((double)rand_st->seed1) / rand_st->max_value_dbl);
@@ -64,6 +67,12 @@ Fill a buffer with random bytes using the SSL library routines
 */
 int my_rand_buffer(unsigned char *buffer, size_t buffer_size) {
   int rc;
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    for (size_t i = 0; i < buffer_size; i++)
+        buffer[i] = i;
+    return 0;
+#endif
+
   rc = RAND_bytes(buffer, (int)buffer_size);
 
   if (!rc) {
@@ -85,6 +94,9 @@ int my_rand_buffer(unsigned char *buffer, size_t buffer_size) {
 double my_rnd_ssl(bool *failed) {
   unsigned int res;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    return 34.56;
+#endif
   if (my_rand_buffer((unsigned char *)&res, sizeof(res))) {
     *failed = true;
     return 0;
diff --git a/sql-common/client.cc b/sql-common/client.cc
index b8050f2b1a7..9a65178c5c4 100644
--- a/sql-common/client.cc
+++ b/sql-common/client.cc
@@ -5892,6 +5892,12 @@ static mysql_state_machine_status csm_begin_connect(mysql_async_connect *ctx) {
     }
   }
 #endif /* _WIN32 */
+if (!net->vio &&
+      (mysql->options.protocol == MYSQL_PROTOCOL_FUZZ)) {
+    net->vio =
+        vio_new(0, VIO_TYPE_FUZZ, 0);
+    ctx->host_info = (char *)ER_CLIENT(CR_LOCALHOST_CONNECTION);
+}
 #if defined(HAVE_SYS_UN_H)
   if (!net->vio &&
       (!mysql->options.protocol ||
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 50b76e2fa75..871006c2d8f 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -6991,7 +6991,9 @@ int mysqld_main(int argc, char **argv)
 
   keyring_lockable_init();
 
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
   my_init_signals();
+#endif
 
   size_t guardize = 0;
 #ifndef _WIN32
@@ -7497,8 +7499,10 @@ int mysqld_main(int argc, char **argv)
     unireg_abort(MYSQLD_ABORT_EXIT);
 
 #ifndef _WIN32
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
   //  Start signal handler thread.
   start_signal_handler();
+#endif
 #endif
 
   /* set all persistent options */
@@ -7543,8 +7547,9 @@ int mysqld_main(int argc, char **argv)
   }
 
   start_handle_manager();
-
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
   create_compress_gtid_table_thread();
+#endif
 
   LogEvent()
       .type(LOG_TYPE_ERROR)
@@ -7591,6 +7596,10 @@ int mysqld_main(int argc, char **argv)
 
   (void)RUN_HOOK(server_state, before_handle_connection, (nullptr));
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+  return 0;
+#endif
+
 #if defined(_WIN32)
   if (mysqld_socket_acceptor != nullptr)
     mysqld_socket_acceptor->check_and_spawn_admin_connection_handler_thread();
@@ -10500,6 +10509,9 @@ static int get_options(int *argc_ptr, char ***argv_ptr) {
 
   if (opt_short_log_format) opt_specialflag |= SPECIAL_SHORT_LOG_FORMAT;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+  Connection_handler_manager::thread_handling = Connection_handler_manager::SCHEDULER_NO_THREADS;
+#endif
   if (Connection_handler_manager::init()) {
     LogErr(ERROR_LEVEL, ER_CONNECTION_HANDLING_OOM);
     return 1;
diff --git a/storage/innobase/buf/buf0buf.cc b/storage/innobase/buf/buf0buf.cc
index 7ecc10961ac..5f13f94eb02 100644
--- a/storage/innobase/buf/buf0buf.cc
+++ b/storage/innobase/buf/buf0buf.cc
@@ -1476,18 +1476,14 @@ dberr_t buf_pool_init(ulint total_size, ulint n_instances) {
       n = n_instances;
     }
 
-    std::vector<std::thread> threads;
-
     std::mutex m;
 
     for (ulint id = i; id < n; ++id) {
-      threads.emplace_back(std::thread(buf_pool_create, &buf_pool_ptr[id], size,
-                                       id, &m, std::ref(errs[id])));
+      buf_pool_create(&buf_pool_ptr[id], size,
+                                       id, &m, std::ref(errs[id]));
     }
 
     for (ulint id = i; id < n; ++id) {
-      threads[id - i].join();
-
       if (errs[id] != DB_SUCCESS) {
         err = errs[id];
       }
diff --git a/vio/CMakeLists.txt b/vio/CMakeLists.txt
index 35ab5f17f15..9b39bfdbdbf 100644
--- a/vio/CMakeLists.txt
+++ b/vio/CMakeLists.txt
@@ -27,6 +27,7 @@ SET(VIO_SOURCES
   viosocket.cc
   viossl.cc
   viosslfactories.cc
+  viofuzz.cc
 )
 
 IF(WIN32)
diff --git a/vio/vio.cc b/vio/vio.cc
index 368c8d7b581..50c3231a8b0 100644
--- a/vio/vio.cc
+++ b/vio/vio.cc
@@ -284,6 +284,26 @@ static bool vio_init(Vio *vio, enum enum_vio_type type, my_socket sd,
       vio->is_blocking_flag = true;
       break;
 
+    case VIO_TYPE_FUZZ:
+      vio->viodelete = vio_delete;
+      vio->vioerrno = vio_errno;
+      vio->read = vio_read_buff_fuzz;
+      vio->write = vio_write_buff_fuzz;
+      vio->fastsend = vio_fastsend_fuzz;
+      vio->viokeepalive = vio_keepalive_fuzz;
+      vio->should_retry = vio_should_retry_fuzz;
+      vio->was_timeout = vio_was_timeout_fuzz;
+      vio->vioshutdown = vio_shutdown_fuzz;
+      vio->peer_addr = vio_peer_addr;
+      vio->timeout = vio_socket_timeout_fuzz;
+      vio->io_wait = vio_io_wait_fuzz;
+      vio->is_connected = vio_is_connected_fuzz;
+      vio->has_data = vio->read_buffer ? vio_buff_has_data : has_no_data;
+      vio->is_blocking = vio_is_blocking;
+      vio->set_blocking = vio_set_blocking;
+      vio->set_blocking_flag = vio_set_blocking_flag;
+      vio->is_blocking_flag = false;
+
     default:
       vio->viodelete = vio_delete;
       vio->vioerrno = vio_errno;
@@ -568,7 +588,8 @@ static const vio_string vio_type_names[] = {{"", 0},
                                             {STRING_WITH_LEN("SSL/TLS")},
                                             {STRING_WITH_LEN("Shared Memory")},
                                             {STRING_WITH_LEN("Internal")},
-                                            {STRING_WITH_LEN("Plugin")}};
+                                            {STRING_WITH_LEN("Plugin")},
+                                            {STRING_WITH_LEN("Fuzz")}};
 
 void get_vio_type_name(enum enum_vio_type vio_type, const char **str,
                        int *len) {
diff --git a/vio/viofuzz.cc b/vio/viofuzz.cc
new file mode 100644
index 00000000000..5b368d685cb
--- /dev/null
+++ b/vio/viofuzz.cc
@@ -0,0 +1,124 @@
+
+#include "my_config.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <time.h>
+#ifndef _WIN32
+#include <netdb.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "my_compiler.h"
+#include "my_dbug.h"
+#include "my_inttypes.h"
+#include "my_io.h"
+#include "my_macros.h"
+#include "vio/vio_priv.h"
+
+#ifdef FIONREAD_IN_SYS_FILIO
+#include <sys/filio.h>
+#endif
+#ifndef _WIN32
+#include <netinet/tcp.h>
+#endif
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+static const uint8_t *fuzzBuffer;
+static size_t fuzzSize;
+static size_t fuzzPos;
+
+
+void sock_initfuzz(const uint8_t *Data, size_t Size) {
+    fuzzPos = 0;
+    fuzzSize = Size;
+    fuzzBuffer = Data;
+}
+
+bool vio_connect_fuzz(Vio *vio, struct sockaddr *addr, socklen_t len,
+                        int timeout) {
+  DBUG_ENTER("vio_socket_connect");
+
+  /* Only for socket-based transport types. */
+  //DBUG_ASSERT(vio->type == VIO_TYPE_SOCKET || vio->type == VIO_TYPE_TCPIP);
+
+  /* Initiate the connection. */
+  return 0;
+}
+
+
+int vio_socket_timeout_fuzz(Vio *vio, uint which, bool b) {
+    DBUG_ENTER("vio_socket_timeout_fuzz\n");
+    return 0;
+}
+
+
+size_t vio_read_buff_fuzz(Vio *vio, uchar *bufp, size_t size) {
+    DBUG_ENTER("vio_read_buff_fuzz.\n");
+    if (size > fuzzSize - fuzzPos) {
+        size = fuzzSize - fuzzPos;
+    }
+    if (fuzzPos < fuzzSize) {
+        memcpy(bufp, fuzzBuffer + fuzzPos, size);
+    }
+    fuzzPos += size;
+#ifdef FUZZ_DEBUG
+    printf("net cli %zu ", size);
+    for (size_t i=0; i<size; i++)
+        printf("%02x ", bufp[i]);
+    printf("\n");
+#endif //FUZZ_DEBUG
+    return size;
+}
+
+size_t vio_write_buff_fuzz(Vio *vio, const uchar *bufp, size_t size) {
+    DBUG_ENTER("vio_write_buff_fuzz\n");
+#ifdef FUZZ_DEBUG
+    printf("net srv %zu ", size);
+    for (size_t i=0; i<size; i++)
+        printf("%02x ", bufp[i]);
+    printf("\n");
+#endif //FUZZ_DEBUG
+    return size;
+}
+
+bool vio_is_connected_fuzz(Vio *vio) {
+    DBUG_ENTER("vio_is_connected_fuzz\n");
+    return (fuzzPos < fuzzSize);
+}
+
+bool vio_was_timeout_fuzz(Vio *vio) {
+    DBUG_ENTER("vio_was_timeout_fuzz\n");
+    return false;
+}
+
+int vio_shutdown_fuzz(Vio *vio) {
+    DBUG_ENTER("vio_shutdown_fuzz");
+    return 0;
+}
+
+int vio_keepalive_fuzz(Vio *vio, bool set_keep_alive) {
+    DBUG_ENTER("vio_keepalive_fuzz\n");
+    return 0;
+}
+int vio_io_wait_fuzz(Vio *vio, enum enum_vio_io_event event, int timeout) {
+    DBUG_ENTER("vio_io_wait_fuzz");
+    return 1;
+}
+
+int vio_fastsend_fuzz(Vio *vio) {
+    DBUG_ENTER("vio_fastsend_fuzz\n");
+    return 0;
+}
+
+bool vio_should_retry_fuzz(Vio *vio) {
+    DBUG_ENTER("vio_should_retry_fuzz\n");
+    return (fuzzPos < fuzzSize);
+}