2 * Copyright 2015-2022 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));
46 async_fibre_init_dispatcher(&nctx->dispatcher);
49 if (!CRYPTO_THREAD_set_local(&ctxkey, nctx))
59 async_ctx *async_get_ctx(void)
61 return (async_ctx *)CRYPTO_THREAD_get_local(&ctxkey);
64 static int async_ctx_free(void)
68 ctx = async_get_ctx();
70 if (!CRYPTO_THREAD_set_local(&ctxkey, NULL))
78 static ASYNC_JOB *async_job_new(void)
80 ASYNC_JOB *job = NULL;
82 job = OPENSSL_zalloc(sizeof(*job));
86 job->status = ASYNC_JOB_RUNNING;
91 static void async_job_free(ASYNC_JOB *job)
94 OPENSSL_free(job->funcargs);
95 async_fibre_free(&job->fibrectx);
100 static ASYNC_JOB *async_get_pool_job(void) {
104 pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
107 * Pool has not been initialised, so init with the defaults, i.e.
108 * no max size and no pre-created jobs
110 if (ASYNC_init_thread(0, 0) == 0)
112 pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
115 job = sk_ASYNC_JOB_pop(pool->jobs);
118 if ((pool->max_size != 0) && (pool->curr_size >= pool->max_size))
121 job = async_job_new();
123 if (! async_fibre_makecontext(&job->fibrectx)) {
133 static void async_release_job(ASYNC_JOB *job) {
136 pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
138 ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
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();
152 ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
158 job->ret = job->func(job->funcargs);
161 job->status = ASYNC_JOB_STOPPING;
162 if (!async_fibre_swapcontext(&job->fibrectx,
163 &ctx->dispatcher, 1)) {
165 * Should not happen. Getting here will close the thread...can't do
168 ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
173 int ASYNC_start_job(ASYNC_JOB **job, ASYNC_WAIT_CTX *wctx, int *ret,
174 int (*func)(void *), void *args, size_t size)
177 OSSL_LIB_CTX *libctx;
179 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
182 ctx = async_get_ctx();
184 ctx = async_ctx_new();
192 if (ctx->currjob != NULL) {
193 if (ctx->currjob->status == ASYNC_JOB_STOPPING) {
194 *ret = ctx->currjob->ret;
195 ctx->currjob->waitctx = NULL;
196 async_release_job(ctx->currjob);
202 if (ctx->currjob->status == ASYNC_JOB_PAUSING) {
204 ctx->currjob->status = ASYNC_JOB_PAUSED;
209 if (ctx->currjob->status == ASYNC_JOB_PAUSED) {
215 * Restore the default libctx to what it was the last time the
218 libctx = OSSL_LIB_CTX_set0_default(ctx->currjob->libctx);
219 if (libctx == NULL) {
220 /* Failed to set the default context */
221 ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
224 /* Resume previous job */
225 if (!async_fibre_swapcontext(&ctx->dispatcher,
226 &ctx->currjob->fibrectx, 1)) {
227 ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
228 ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
232 * In case the fibre changed the default libctx we set it back
233 * again to what it was originally, and remember what it had
236 ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
240 /* Should not happen */
241 ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
242 async_release_job(ctx->currjob);
248 /* Start a new job */
249 if ((ctx->currjob = async_get_pool_job()) == NULL)
250 return ASYNC_NO_JOBS;
253 ctx->currjob->funcargs = OPENSSL_malloc(size);
254 if (ctx->currjob->funcargs == NULL) {
255 async_release_job(ctx->currjob);
259 memcpy(ctx->currjob->funcargs, args, size);
261 ctx->currjob->funcargs = NULL;
264 ctx->currjob->func = func;
265 ctx->currjob->waitctx = wctx;
266 libctx = ossl_lib_ctx_get_concrete(NULL);
267 if (!async_fibre_swapcontext(&ctx->dispatcher,
268 &ctx->currjob->fibrectx, 1)) {
269 ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
273 * In case the fibre changed the default libctx we set it back again
274 * to what it was, and remember what it had been changed to.
276 ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
280 async_release_job(ctx->currjob);
286 int ASYNC_pause_job(void)
289 async_ctx *ctx = async_get_ctx();
292 || ctx->currjob == NULL
295 * Could be we've deliberately not been started within a job so this is
296 * counted as success.
302 job->status = ASYNC_JOB_PAUSING;
304 if (!async_fibre_swapcontext(&job->fibrectx,
305 &ctx->dispatcher, 1)) {
306 ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
309 /* Reset counts of added and deleted fds */
310 async_wait_ctx_reset_counts(job->waitctx);
315 static void async_empty_pool(async_pool *pool)
319 if (pool == NULL || pool->jobs == NULL)
323 job = sk_ASYNC_JOB_pop(pool->jobs);
330 if (!CRYPTO_THREAD_init_local(&ctxkey, NULL))
333 if (!CRYPTO_THREAD_init_local(&poolkey, NULL)) {
334 CRYPTO_THREAD_cleanup_local(&ctxkey);
338 return async_local_init();
341 void async_deinit(void)
343 CRYPTO_THREAD_cleanup_local(&ctxkey);
344 CRYPTO_THREAD_cleanup_local(&poolkey);
345 async_local_deinit();
348 int ASYNC_init_thread(size_t max_size, size_t init_size)
351 size_t curr_size = 0;
353 if (init_size > max_size) {
354 ERR_raise(ERR_LIB_ASYNC, ASYNC_R_INVALID_POOL_SIZE);
358 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
361 if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
364 pool = OPENSSL_zalloc(sizeof(*pool));
368 pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
369 if (pool->jobs == NULL) {
370 ERR_raise(ERR_LIB_ASYNC, ERR_R_CRYPTO_LIB);
375 pool->max_size = max_size;
377 /* Pre-create jobs as required */
378 while (init_size--) {
380 job = async_job_new();
381 if (job == NULL || !async_fibre_makecontext(&job->fibrectx)) {
383 * Not actually fatal because we already created the pool, just
384 * skip creation of any more jobs
389 job->funcargs = NULL;
390 sk_ASYNC_JOB_push(pool->jobs, job); /* Cannot fail due to reserve */
393 pool->curr_size = curr_size;
394 if (!CRYPTO_THREAD_set_local(&poolkey, pool)) {
395 ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SET_POOL);
401 async_empty_pool(pool);
402 sk_ASYNC_JOB_free(pool->jobs);
407 static void async_delete_thread_state(void *arg)
409 async_pool *pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
412 async_empty_pool(pool);
413 sk_ASYNC_JOB_free(pool->jobs);
415 CRYPTO_THREAD_set_local(&poolkey, NULL);
417 async_local_cleanup();
421 void ASYNC_cleanup_thread(void)
423 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
426 async_delete_thread_state(NULL);
429 ASYNC_JOB *ASYNC_get_current_job(void)
433 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
436 ctx = async_get_ctx();
443 ASYNC_WAIT_CTX *ASYNC_get_wait_ctx(ASYNC_JOB *job)
448 void ASYNC_block_pause(void)
452 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
455 ctx = async_get_ctx();
456 if (ctx == NULL || ctx->currjob == NULL) {
458 * We're not in a job anyway so ignore this
465 void ASYNC_unblock_pause(void)
469 if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
472 ctx = async_get_ctx();
473 if (ctx == NULL || ctx->currjob == NULL) {
475 * We're not in a job anyway so ignore this
479 if (ctx->blocked > 0)