2 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * Without this we start getting longjmp crashes because it thinks we're jumping
12 * up the stack when in fact we are jumping to an entirely different stack. The
13 * cost of this is not having certain buffer overrun/underrun checks etc for
14 * this source file :-(
16 #undef _FORTIFY_SOURCE
18 /* This must be the first #include file */
19 #include "async_local.h"
21 #include <openssl/err.h>
22 #include "crypto/cryptlib.h"
25 #define ASYNC_JOB_RUNNING 0
26 #define ASYNC_JOB_PAUSING 1
27 #define ASYNC_JOB_PAUSED 2
28 #define ASYNC_JOB_STOPPING 3
30 static CRYPTO_THREAD_LOCAL ctxkey;
31 static CRYPTO_THREAD_LOCAL poolkey;
33 static void async_delete_thread_state(void *arg);
35 static async_ctx *async_ctx_new(void)
39 if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
42 nctx = OPENSSL_malloc(sizeof(*nctx));
44 ASYNCerr(ASYNC_F_ASYNC_CTX_NEW, ERR_R_MALLOC_FAILURE);
48 async_fibre_init_dispatcher(&nctx->dispatcher);
51 if (!CRYPTO_THREAD_set_local(&ctxkey, nctx))
61 async_ctx *async_get_ctx(void)
63 return (async_ctx *)CRYPTO_THREAD_get_local(&ctxkey);
66 static int async_ctx_free(void)
70 ctx = async_get_ctx();
72 if (!CRYPTO_THREAD_set_local(&ctxkey, NULL))
80 static ASYNC_JOB *async_job_new(void)
82 ASYNC_JOB *job = NULL;
84 job = OPENSSL_zalloc(sizeof(*job));
86 ASYNCerr(ASYNC_F_ASYNC_JOB_NEW, ERR_R_MALLOC_FAILURE);
90 job->status = ASYNC_JOB_RUNNING;
95 static void async_job_free(ASYNC_JOB *job)
98 OPENSSL_free(job->funcargs);
99 async_fibre_free(&job->fibrectx);
104 static ASYNC_JOB *async_get_pool_job(void) {
108 pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
111 * Pool has not been initialised, so init with the defaults, i.e.
112 * no max size and no pre-created jobs
114 if (ASYNC_init_thread(0, 0) == 0)
116 pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
119 job = sk_ASYNC_JOB_pop(pool->jobs);
122 if ((pool->max_size != 0) && (pool->curr_size >= pool->max_size))
125 job = async_job_new();
127 if (! async_fibre_makecontext(&job->fibrectx)) {
137 static void async_release_job(ASYNC_JOB *job) {
140 pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
141 OPENSSL_free(job->funcargs);
142 job->funcargs = NULL;
143 sk_ASYNC_JOB_push(pool->jobs, job);
146 void async_start_func(void)
149 async_ctx *ctx = async_get_ctx();
154 job->ret = job->func(job->funcargs);
157 job->status = ASYNC_JOB_STOPPING;
158 if (!async_fibre_swapcontext(&job->fibrectx,
159 &ctx->dispatcher, 1)) {
161 * Should not happen. Getting here will close the thread...can't do
164 ASYNCerr(ASYNC_F_ASYNC_START_FUNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
169 int ASYNC_start_job(ASYNC_JOB **job, ASYNC_WAIT_CTX *wctx, int *ret,
170 int (*func)(void *), void *args, size_t size)
175 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
178 ctx = async_get_ctx();
180 ctx = async_ctx_new();
188 if (ctx->currjob != NULL) {
189 if (ctx->currjob->status == ASYNC_JOB_STOPPING) {
190 *ret = ctx->currjob->ret;
191 ctx->currjob->waitctx = NULL;
192 async_release_job(ctx->currjob);
198 if (ctx->currjob->status == ASYNC_JOB_PAUSING) {
200 ctx->currjob->status = ASYNC_JOB_PAUSED;
205 if (ctx->currjob->status == ASYNC_JOB_PAUSED) {
208 * Restore the default libctx to what it was the last time the
211 libctx = OPENSSL_CTX_set0_default(ctx->currjob->libctx);
212 /* Resume previous job */
213 if (!async_fibre_swapcontext(&ctx->dispatcher,
214 &ctx->currjob->fibrectx, 1)) {
215 ASYNCerr(ASYNC_F_ASYNC_START_JOB,
216 ASYNC_R_FAILED_TO_SWAP_CONTEXT);
220 * In case the fibre changed the default libctx we set it back
221 * again to what it was originally, and remember what it had
224 ctx->currjob->libctx = OPENSSL_CTX_set0_default(libctx);
228 /* Should not happen */
229 ASYNCerr(ASYNC_F_ASYNC_START_JOB, ERR_R_INTERNAL_ERROR);
230 async_release_job(ctx->currjob);
236 /* Start a new job */
237 if ((ctx->currjob = async_get_pool_job()) == NULL)
238 return ASYNC_NO_JOBS;
241 ctx->currjob->funcargs = OPENSSL_malloc(size);
242 if (ctx->currjob->funcargs == NULL) {
243 ASYNCerr(ASYNC_F_ASYNC_START_JOB, ERR_R_MALLOC_FAILURE);
244 async_release_job(ctx->currjob);
248 memcpy(ctx->currjob->funcargs, args, size);
250 ctx->currjob->funcargs = NULL;
253 ctx->currjob->func = func;
254 ctx->currjob->waitctx = wctx;
255 libctx = openssl_ctx_get_concrete(NULL);
256 if (!async_fibre_swapcontext(&ctx->dispatcher,
257 &ctx->currjob->fibrectx, 1)) {
258 ASYNCerr(ASYNC_F_ASYNC_START_JOB, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
262 * In case the fibre changed the default libctx we set it back again
263 * to what it was, and remember what it had been changed to.
265 ctx->currjob->libctx = OPENSSL_CTX_set0_default(libctx);
269 async_release_job(ctx->currjob);
275 int ASYNC_pause_job(void)
278 async_ctx *ctx = async_get_ctx();
281 || ctx->currjob == NULL
284 * Could be we've deliberately not been started within a job so this is
285 * counted as success.
291 job->status = ASYNC_JOB_PAUSING;
293 if (!async_fibre_swapcontext(&job->fibrectx,
294 &ctx->dispatcher, 1)) {
295 ASYNCerr(ASYNC_F_ASYNC_PAUSE_JOB, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
298 /* Reset counts of added and deleted fds */
299 async_wait_ctx_reset_counts(job->waitctx);
304 static void async_empty_pool(async_pool *pool)
308 if (pool == NULL || pool->jobs == NULL)
312 job = sk_ASYNC_JOB_pop(pool->jobs);
319 if (!CRYPTO_THREAD_init_local(&ctxkey, NULL))
322 if (!CRYPTO_THREAD_init_local(&poolkey, NULL)) {
323 CRYPTO_THREAD_cleanup_local(&ctxkey);
330 void async_deinit(void)
332 CRYPTO_THREAD_cleanup_local(&ctxkey);
333 CRYPTO_THREAD_cleanup_local(&poolkey);
336 int ASYNC_init_thread(size_t max_size, size_t init_size)
339 size_t curr_size = 0;
341 if (init_size > max_size) {
342 ASYNCerr(ASYNC_F_ASYNC_INIT_THREAD, ASYNC_R_INVALID_POOL_SIZE);
346 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
349 if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
352 pool = OPENSSL_zalloc(sizeof(*pool));
354 ASYNCerr(ASYNC_F_ASYNC_INIT_THREAD, ERR_R_MALLOC_FAILURE);
358 pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
359 if (pool->jobs == NULL) {
360 ASYNCerr(ASYNC_F_ASYNC_INIT_THREAD, ERR_R_MALLOC_FAILURE);
365 pool->max_size = max_size;
367 /* Pre-create jobs as required */
368 while (init_size--) {
370 job = async_job_new();
371 if (job == NULL || !async_fibre_makecontext(&job->fibrectx)) {
373 * Not actually fatal because we already created the pool, just
374 * skip creation of any more jobs
379 job->funcargs = NULL;
380 sk_ASYNC_JOB_push(pool->jobs, job); /* Cannot fail due to reserve */
383 pool->curr_size = curr_size;
384 if (!CRYPTO_THREAD_set_local(&poolkey, pool)) {
385 ASYNCerr(ASYNC_F_ASYNC_INIT_THREAD, ASYNC_R_FAILED_TO_SET_POOL);
391 async_empty_pool(pool);
392 sk_ASYNC_JOB_free(pool->jobs);
397 /* TODO(3.0): arg ignored for now */
398 static void async_delete_thread_state(void *arg)
400 async_pool *pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
403 async_empty_pool(pool);
404 sk_ASYNC_JOB_free(pool->jobs);
406 CRYPTO_THREAD_set_local(&poolkey, NULL);
408 async_local_cleanup();
412 void ASYNC_cleanup_thread(void)
414 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
417 async_delete_thread_state(NULL);
420 ASYNC_JOB *ASYNC_get_current_job(void)
424 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
427 ctx = async_get_ctx();
434 ASYNC_WAIT_CTX *ASYNC_get_wait_ctx(ASYNC_JOB *job)
439 void ASYNC_block_pause(void)
443 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
446 ctx = async_get_ctx();
447 if (ctx == NULL || ctx->currjob == NULL) {
449 * We're not in a job anyway so ignore this
456 void ASYNC_unblock_pause(void)
460 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
463 ctx = async_get_ctx();
464 if (ctx == NULL || ctx->currjob == NULL) {
466 * We're not in a job anyway so ignore this
470 if (ctx->blocked > 0)