initial/final commitHEADmaster

1 files changed, 676 insertions, 0 deletions

diff --git a/openssl-1.1.0h/crypto/init.c b/openssl-1.1.0h/crypto/init.c
new file mode 100644
index 0000000..173eac3
--- /dev/null
+++ b/openssl-1.1.0h/crypto/init.c
@@ -0,0 +1,676 @@
+/*
+ * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <internal/cryptlib_int.h>
+#include <openssl/err.h>
+#include <internal/rand.h>
+#include <internal/bio.h>
+#include <openssl/evp.h>
+#include <internal/evp_int.h>
+#include <internal/conf.h>
+#include <internal/async.h>
+#include <internal/engine.h>
+#include <internal/comp.h>
+#include <internal/err.h>
+#include <internal/err_int.h>
+#include <internal/objects.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <internal/thread_once.h>
+#include <internal/dso.h>
+
+static int stopped = 0;
+
+static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
+
+static CRYPTO_THREAD_LOCAL threadstopkey;
+
+static void ossl_init_thread_stop_wrap(void *local)
+{
+    ossl_init_thread_stop((struct thread_local_inits_st *)local);
+}
+
+static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
+{
+    struct thread_local_inits_st *local =
+        CRYPTO_THREAD_get_local(&threadstopkey);
+
+    if (local == NULL && alloc) {
+        local = OPENSSL_zalloc(sizeof(*local));
+        if (local != NULL && !CRYPTO_THREAD_set_local(&threadstopkey, local)) {
+            OPENSSL_free(local);
+            return NULL;
+        }
+    }
+    if (!alloc) {
+        CRYPTO_THREAD_set_local(&threadstopkey, NULL);
+    }
+
+    return local;
+}
+
+typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
+struct ossl_init_stop_st {
+    void (*handler)(void);
+    OPENSSL_INIT_STOP *next;
+};
+
+static OPENSSL_INIT_STOP *stop_handlers = NULL;
+static CRYPTO_RWLOCK *init_lock = NULL;
+
+static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
+static int base_inited = 0;
+DEFINE_RUN_ONCE_STATIC(ossl_init_base)
+{
+#ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
+#endif
+    /*
+     * We use a dummy thread local key here. We use the destructor to detect
+     * when the thread is going to stop (where that feature is available)
+     */
+    CRYPTO_THREAD_init_local(&threadstopkey, ossl_init_thread_stop_wrap);
+#ifndef OPENSSL_SYS_UEFI
+    atexit(OPENSSL_cleanup);
+#endif
+    if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
+        return 0;
+    OPENSSL_cpuid_setup();
+
+    /*
+     * BIG FAT WARNING!
+     * Everything needed to be initialized in this function before threads
+     * come along MUST happen before base_inited is set to 1, or we will
+     * see race conditions.
+     */
+    base_inited = 1;
+
+#if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
+# ifdef DSO_WIN32
+    {
+        HMODULE handle = NULL;
+        BOOL ret;
+
+        /* We don't use the DSO route for WIN32 because there is a better way */
+        ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
+                                | GET_MODULE_HANDLE_EX_FLAG_PIN,
+                                (void *)&base_inited, &handle);
+
+        return (ret == TRUE) ? 1 : 0;
+    }
+# else
+    /*
+     * Deliberately leak a reference to ourselves. This will force the library
+     * to remain loaded until the atexit() handler is run at process exit.
+     */
+    {
+        DSO *dso = NULL;
+
+        ERR_set_mark();
+        dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
+        DSO_free(dso);
+        ERR_pop_to_mark();
+    }
+# endif
+#endif
+
+    return 1;
+}
+
+static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
+static int load_crypto_strings_inited = 0;
+DEFINE_RUN_ONCE_STATIC(ossl_init_no_load_crypto_strings)
+{
+    /* Do nothing in this case */
+    return 1;
+}
+
+DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
+{
+    int ret = 1;
+    /*
+     * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
+     * pulling in all the error strings during static linking
+     */
+#if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
+# ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
+                    "err_load_crypto_strings_int()\n");
+# endif
+    ret = err_load_crypto_strings_int();
+    load_crypto_strings_inited = 1;
+#endif    
+    return ret;
+}
+
+static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
+{
+    /*
+     * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
+     * pulling in all the ciphers during static linking
+     */
+#ifndef OPENSSL_NO_AUTOALGINIT
+# ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
+                    "openssl_add_all_ciphers_int()\n");
+# endif
+    openssl_add_all_ciphers_int();
+#endif
+    return 1;
+}
+
+static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
+{
+    /*
+     * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
+     * pulling in all the ciphers during static linking
+     */
+#ifndef OPENSSL_NO_AUTOALGINIT
+# ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
+                    "openssl_add_all_digests()\n");
+# endif
+    openssl_add_all_digests_int();
+#endif
+    return 1;
+}
+
+DEFINE_RUN_ONCE_STATIC(ossl_init_no_add_algs)
+{
+    /* Do nothing */
+    return 1;
+}
+
+static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
+static int config_inited = 0;
+static const char *appname;
+DEFINE_RUN_ONCE_STATIC(ossl_init_config)
+{
+#ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr,
+            "OPENSSL_INIT: ossl_init_config: openssl_config(%s)\n",
+            appname == NULL ? "NULL" : appname);
+#endif
+    openssl_config_int(appname);
+    config_inited = 1;
+    return 1;
+}
+DEFINE_RUN_ONCE_STATIC(ossl_init_no_config)
+{
+#ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr,
+            "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");
+#endif
+    openssl_no_config_int();
+    config_inited = 1;
+    return 1;
+}
+
+static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
+static int async_inited = 0;
+DEFINE_RUN_ONCE_STATIC(ossl_init_async)
+{
+#ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
+#endif
+    if (!async_init())
+        return 0;
+    async_inited = 1;
+    return 1;
+}
+
+#ifndef OPENSSL_NO_ENGINE
+static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
+{
+# ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
+                    "engine_load_openssl_int()\n");
+# endif
+    engine_load_openssl_int();
+    return 1;
+}
+# if !defined(OPENSSL_NO_HW) && \
+    (defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV))
+static CRYPTO_ONCE engine_cryptodev = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_cryptodev)
+{
+#  ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_cryptodev: "
+                    "engine_load_cryptodev_int()\n");
+#  endif
+    engine_load_cryptodev_int();
+    return 1;
+}
+# endif
+
+# ifndef OPENSSL_NO_RDRAND
+static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
+{
+#  ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
+                    "engine_load_rdrand_int()\n");
+#  endif
+    engine_load_rdrand_int();
+    return 1;
+}
+# endif
+static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
+{
+# ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
+                    "engine_load_dynamic_int()\n");
+# endif
+    engine_load_dynamic_int();
+    return 1;
+}
+# ifndef OPENSSL_NO_STATIC_ENGINE
+#  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
+static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
+{
+#   ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
+                    "engine_load_padlock_int()\n");
+#   endif
+    engine_load_padlock_int();
+    return 1;
+}
+#  endif
+#  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
+static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
+{
+#   ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
+                    "engine_load_capi_int()\n");
+#   endif
+    engine_load_capi_int();
+    return 1;
+}
+#  endif
+#  if !defined(OPENSSL_NO_AFALGENG)
+static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
+{
+#   ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
+                    "engine_load_afalg_int()\n");
+#   endif
+    engine_load_afalg_int();
+    return 1;
+}
+#  endif
+# endif
+#endif
+
+#ifndef OPENSSL_NO_COMP
+static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
+
+static int zlib_inited = 0;
+DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
+{
+    /* Do nothing - we need to know about this for the later cleanup */
+    zlib_inited = 1;
+    return 1;
+}
+#endif
+
+static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
+{
+    /* Can't do much about this */
+    if (locals == NULL)
+        return;
+
+    if (locals->async) {
+#ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
+                        "ASYNC_cleanup_thread()\n");
+#endif
+        ASYNC_cleanup_thread();
+    }
+
+    if (locals->err_state) {
+#ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
+                        "err_delete_thread_state()\n");
+#endif
+        err_delete_thread_state();
+    }
+
+    OPENSSL_free(locals);
+}
+
+void OPENSSL_thread_stop(void)
+{
+    ossl_init_thread_stop(
+        (struct thread_local_inits_st *)ossl_init_get_thread_local(0));
+}
+
+int ossl_init_thread_start(uint64_t opts)
+{
+    struct thread_local_inits_st *locals;
+
+    if (!OPENSSL_init_crypto(0, NULL))
+        return 0;
+
+    locals = ossl_init_get_thread_local(1);
+
+    if (locals == NULL)
+        return 0;
+
+    if (opts & OPENSSL_INIT_THREAD_ASYNC) {
+#ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
+                        "marking thread for async\n");
+#endif
+        locals->async = 1;
+    }
+
+    if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
+#ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
+                        "marking thread for err_state\n");
+#endif
+        locals->err_state = 1;
+    }
+
+    return 1;
+}
+
+void OPENSSL_cleanup(void)
+{
+    OPENSSL_INIT_STOP *currhandler, *lasthandler;
+
+    /* If we've not been inited then no need to deinit */
+    if (!base_inited)
+        return;
+
+    /* Might be explicitly called and also by atexit */
+    if (stopped)
+        return;
+    stopped = 1;
+
+    /*
+     * Thread stop may not get automatically called by the thread library for
+     * the very last thread in some situations, so call it directly.
+     */
+    ossl_init_thread_stop(ossl_init_get_thread_local(0));
+
+    currhandler = stop_handlers;
+    while (currhandler != NULL) {
+        currhandler->handler();
+        lasthandler = currhandler;
+        currhandler = currhandler->next;
+        OPENSSL_free(lasthandler);
+    }
+    stop_handlers = NULL;
+
+    CRYPTO_THREAD_lock_free(init_lock);
+
+    /*
+     * We assume we are single-threaded for this function, i.e. no race
+     * conditions for the various "*_inited" vars below.
+     */
+
+#ifndef OPENSSL_NO_COMP
+    if (zlib_inited) {
+#ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                        "comp_zlib_cleanup_int()\n");
+#endif
+        comp_zlib_cleanup_int();
+    }
+#endif
+
+    if (async_inited) {
+# ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                        "async_deinit()\n");
+# endif
+        async_deinit();
+    }
+
+    if (load_crypto_strings_inited) {
+#ifdef OPENSSL_INIT_DEBUG
+        fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                        "err_free_strings_int()\n");
+#endif
+        err_free_strings_int();
+    }
+
+    CRYPTO_THREAD_cleanup_local(&threadstopkey);
+
+#ifdef OPENSSL_INIT_DEBUG
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "rand_cleanup_int()\n");
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "conf_modules_free_int()\n");
+#ifndef OPENSSL_NO_ENGINE
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "engine_cleanup_int()\n");
+#endif
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "crypto_cleanup_all_ex_data_int()\n");
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "bio_sock_cleanup_int()\n");
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "bio_cleanup()\n");
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "evp_cleanup_int()\n");
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "obj_cleanup_int()\n");
+    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
+                    "err_cleanup()\n");
+#endif
+    /*
+     * Note that cleanup order is important:
+     * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
+     * must be called before engine_cleanup_int()
+     * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
+     * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
+     * - conf_modules_free_int() can end up in ENGINE code so must be called
+     * before engine_cleanup_int()
+     * - ENGINEs and additional EVP algorithms might use added OIDs names so
+     * obj_cleanup_int() must be called last
+     */
+    rand_cleanup_int();
+    conf_modules_free_int();
+#ifndef OPENSSL_NO_ENGINE
+    engine_cleanup_int();
+#endif
+    crypto_cleanup_all_ex_data_int();
+    bio_cleanup();
+    evp_cleanup_int();
+    obj_cleanup_int();
+    err_cleanup();
+
+    base_inited = 0;
+}
+
+/*
+ * If this function is called with a non NULL settings value then it must be
+ * called prior to any threads making calls to any OpenSSL functions,
+ * i.e. passing a non-null settings value is assumed to be single-threaded.
+ */
+int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
+{
+    static int stoperrset = 0;
+
+    if (stopped) {
+        if (!stoperrset) {
+            /*
+             * We only ever set this once to avoid getting into an infinite
+             * loop where the error system keeps trying to init and fails so
+             * sets an error etc
+             */
+            stoperrset = 1;
+            CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
+        }
+        return 0;
+    }
+
+    if (!base_inited && !RUN_ONCE(&base, ossl_init_base))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
+            && !RUN_ONCE(&load_crypto_strings,
+                         ossl_init_no_load_crypto_strings))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
+            && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
+            && !RUN_ONCE(&add_all_ciphers, ossl_init_no_add_algs))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
+            && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
+            && !RUN_ONCE(&add_all_digests, ossl_init_no_add_algs))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
+            && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
+        return 0;
+
+    if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
+            && !RUN_ONCE(&config, ossl_init_no_config))
+        return 0;
+
+    if (opts & OPENSSL_INIT_LOAD_CONFIG) {
+        int ret;
+        CRYPTO_THREAD_write_lock(init_lock);
+        appname = (settings == NULL) ? NULL : settings->appname;
+        ret = RUN_ONCE(&config, ossl_init_config);
+        CRYPTO_THREAD_unlock(init_lock);
+        if (!ret)
+            return 0;
+    }
+
+    if ((opts & OPENSSL_INIT_ASYNC)
+            && !RUN_ONCE(&async, ossl_init_async))
+        return 0;
+
+#ifndef OPENSSL_NO_ENGINE
+    if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
+            && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
+        return 0;
+# if !defined(OPENSSL_NO_HW) && \
+    (defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV))
+    if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
+            && !RUN_ONCE(&engine_cryptodev, ossl_init_engine_cryptodev))
+        return 0;
+# endif
+# ifndef OPENSSL_NO_RDRAND
+    if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
+            && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
+        return 0;
+# endif
+    if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
+            && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
+        return 0;
+# ifndef OPENSSL_NO_STATIC_ENGINE
+#  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
+    if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
+            && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
+        return 0;
+#  endif
+#  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
+    if ((opts & OPENSSL_INIT_ENGINE_CAPI)
+            && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
+        return 0;
+#  endif
+#  if !defined(OPENSSL_NO_AFALGENG)
+    if ((opts & OPENSSL_INIT_ENGINE_AFALG)
+            && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
+        return 0;
+#  endif
+# endif
+    if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
+                | OPENSSL_INIT_ENGINE_OPENSSL
+                | OPENSSL_INIT_ENGINE_AFALG)) {
+        ENGINE_register_all_complete();
+    }
+#endif
+
+#ifndef OPENSSL_NO_COMP
+    if ((opts & OPENSSL_INIT_ZLIB)
+            && !RUN_ONCE(&zlib, ossl_init_zlib))
+        return 0;
+#endif
+
+    return 1;
+}
+
+int OPENSSL_atexit(void (*handler)(void))
+{
+    OPENSSL_INIT_STOP *newhand;
+
+#if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
+    {
+        union {
+            void *sym;
+            void (*func)(void);
+        } handlersym;
+
+        handlersym.func = handler;
+# ifdef DSO_WIN32
+        {
+            HMODULE handle = NULL;
+            BOOL ret;
+
+            /*
+             * We don't use the DSO route for WIN32 because there is a better
+             * way
+             */
+            ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
+                                    | GET_MODULE_HANDLE_EX_FLAG_PIN,
+                                    handlersym.sym, &handle);
+
+            if (!ret)
+                return 0;
+        }
+# else
+        /*
+         * Deliberately leak a reference to the handler. This will force the
+         * library/code containing the handler to remain loaded until we run the
+         * atexit handler. If -znodelete has been used then this is
+         * unnecessary.
+         */
+        {
+            DSO *dso = NULL;
+
+            ERR_set_mark();
+            dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
+            DSO_free(dso);
+            ERR_pop_to_mark();
+        }
+# endif
+    }
+#endif
+
+    newhand = OPENSSL_malloc(sizeof(*newhand));
+    if (newhand == NULL)
+        return 0;
+
+    newhand->handler = handler;
+    newhand->next = stop_handlers;
+    stop_handlers = newhand;
+
+    return 1;
+}