mirror of https://github.com/openssl/openssl.git
489 lines
12 KiB
C
489 lines
12 KiB
C
/*
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* Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* Without this we start getting longjmp crashes because it thinks we're jumping
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* up the stack when in fact we are jumping to an entirely different stack. The
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* cost of this is not having certain buffer overrun/underrun checks etc for
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* this source file :-(
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*/
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#undef _FORTIFY_SOURCE
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/* This must be the first #include file */
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#include "async_local.h"
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#include <openssl/err.h>
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#include "crypto/cryptlib.h"
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#include <string.h>
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#define ASYNC_JOB_RUNNING 0
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#define ASYNC_JOB_PAUSING 1
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#define ASYNC_JOB_PAUSED 2
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#define ASYNC_JOB_STOPPING 3
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static CRYPTO_THREAD_LOCAL ctxkey;
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static CRYPTO_THREAD_LOCAL poolkey;
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static void async_delete_thread_state(void *arg);
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static async_ctx *async_ctx_new(void)
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{
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async_ctx *nctx;
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if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
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return NULL;
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nctx = OPENSSL_malloc(sizeof(*nctx));
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if (nctx == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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async_fibre_init_dispatcher(&nctx->dispatcher);
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nctx->currjob = NULL;
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nctx->blocked = 0;
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if (!CRYPTO_THREAD_set_local(&ctxkey, nctx))
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goto err;
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return nctx;
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err:
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OPENSSL_free(nctx);
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return NULL;
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}
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async_ctx *async_get_ctx(void)
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{
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return (async_ctx *)CRYPTO_THREAD_get_local(&ctxkey);
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}
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static int async_ctx_free(void)
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{
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async_ctx *ctx;
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ctx = async_get_ctx();
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if (!CRYPTO_THREAD_set_local(&ctxkey, NULL))
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return 0;
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OPENSSL_free(ctx);
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return 1;
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}
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static ASYNC_JOB *async_job_new(void)
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{
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ASYNC_JOB *job = NULL;
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job = OPENSSL_zalloc(sizeof(*job));
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if (job == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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job->status = ASYNC_JOB_RUNNING;
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return job;
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}
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static void async_job_free(ASYNC_JOB *job)
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{
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if (job != NULL) {
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OPENSSL_free(job->funcargs);
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async_fibre_free(&job->fibrectx);
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OPENSSL_free(job);
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}
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}
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static ASYNC_JOB *async_get_pool_job(void) {
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ASYNC_JOB *job;
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async_pool *pool;
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pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
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if (pool == NULL) {
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/*
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* Pool has not been initialised, so init with the defaults, i.e.
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* no max size and no pre-created jobs
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*/
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if (ASYNC_init_thread(0, 0) == 0)
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return NULL;
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pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
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}
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job = sk_ASYNC_JOB_pop(pool->jobs);
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if (job == NULL) {
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/* Pool is empty */
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if ((pool->max_size != 0) && (pool->curr_size >= pool->max_size))
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return NULL;
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job = async_job_new();
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if (job != NULL) {
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if (! async_fibre_makecontext(&job->fibrectx)) {
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async_job_free(job);
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return NULL;
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}
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pool->curr_size++;
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}
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}
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return job;
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}
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static void async_release_job(ASYNC_JOB *job) {
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async_pool *pool;
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pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
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if (pool == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
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return;
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}
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OPENSSL_free(job->funcargs);
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job->funcargs = NULL;
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sk_ASYNC_JOB_push(pool->jobs, job);
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}
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void async_start_func(void)
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{
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ASYNC_JOB *job;
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async_ctx *ctx = async_get_ctx();
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if (ctx == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
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return;
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}
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while (1) {
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/* Run the job */
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job = ctx->currjob;
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job->ret = job->func(job->funcargs);
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/* Stop the job */
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job->status = ASYNC_JOB_STOPPING;
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if (!async_fibre_swapcontext(&job->fibrectx,
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&ctx->dispatcher, 1)) {
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/*
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* Should not happen. Getting here will close the thread...can't do
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* much about it
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*/
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ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
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}
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}
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}
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int ASYNC_start_job(ASYNC_JOB **job, ASYNC_WAIT_CTX *wctx, int *ret,
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int (*func)(void *), void *args, size_t size)
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{
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async_ctx *ctx;
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OSSL_LIB_CTX *libctx;
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if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
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return ASYNC_ERR;
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ctx = async_get_ctx();
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if (ctx == NULL)
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ctx = async_ctx_new();
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if (ctx == NULL)
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return ASYNC_ERR;
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if (*job != NULL)
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ctx->currjob = *job;
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for (;;) {
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if (ctx->currjob != NULL) {
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if (ctx->currjob->status == ASYNC_JOB_STOPPING) {
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*ret = ctx->currjob->ret;
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ctx->currjob->waitctx = NULL;
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async_release_job(ctx->currjob);
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ctx->currjob = NULL;
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*job = NULL;
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return ASYNC_FINISH;
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}
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if (ctx->currjob->status == ASYNC_JOB_PAUSING) {
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*job = ctx->currjob;
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ctx->currjob->status = ASYNC_JOB_PAUSED;
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ctx->currjob = NULL;
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return ASYNC_PAUSE;
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}
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if (ctx->currjob->status == ASYNC_JOB_PAUSED) {
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if (*job == NULL)
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return ASYNC_ERR;
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ctx->currjob = *job;
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/*
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* Restore the default libctx to what it was the last time the
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* fibre ran
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*/
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libctx = OSSL_LIB_CTX_set0_default(ctx->currjob->libctx);
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if (libctx == NULL) {
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/* Failed to set the default context */
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ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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/* Resume previous job */
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if (!async_fibre_swapcontext(&ctx->dispatcher,
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&ctx->currjob->fibrectx, 1)) {
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ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
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ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
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goto err;
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}
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/*
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* In case the fibre changed the default libctx we set it back
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* again to what it was originally, and remember what it had
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* been changed to.
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*/
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ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
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continue;
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}
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/* Should not happen */
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ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
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async_release_job(ctx->currjob);
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ctx->currjob = NULL;
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*job = NULL;
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return ASYNC_ERR;
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}
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/* Start a new job */
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if ((ctx->currjob = async_get_pool_job()) == NULL)
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return ASYNC_NO_JOBS;
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if (args != NULL) {
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ctx->currjob->funcargs = OPENSSL_malloc(size);
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if (ctx->currjob->funcargs == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
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async_release_job(ctx->currjob);
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ctx->currjob = NULL;
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return ASYNC_ERR;
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}
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memcpy(ctx->currjob->funcargs, args, size);
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} else {
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ctx->currjob->funcargs = NULL;
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}
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ctx->currjob->func = func;
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ctx->currjob->waitctx = wctx;
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libctx = ossl_lib_ctx_get_concrete(NULL);
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if (!async_fibre_swapcontext(&ctx->dispatcher,
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&ctx->currjob->fibrectx, 1)) {
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ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
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goto err;
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}
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/*
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* In case the fibre changed the default libctx we set it back again
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* to what it was, and remember what it had been changed to.
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*/
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ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
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}
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err:
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async_release_job(ctx->currjob);
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ctx->currjob = NULL;
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*job = NULL;
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return ASYNC_ERR;
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}
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int ASYNC_pause_job(void)
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{
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ASYNC_JOB *job;
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async_ctx *ctx = async_get_ctx();
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if (ctx == NULL
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|| ctx->currjob == NULL
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|| ctx->blocked) {
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/*
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* Could be we've deliberately not been started within a job so this is
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* counted as success.
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*/
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return 1;
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}
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job = ctx->currjob;
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job->status = ASYNC_JOB_PAUSING;
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if (!async_fibre_swapcontext(&job->fibrectx,
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&ctx->dispatcher, 1)) {
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ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
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return 0;
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}
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/* Reset counts of added and deleted fds */
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async_wait_ctx_reset_counts(job->waitctx);
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return 1;
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}
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static void async_empty_pool(async_pool *pool)
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{
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ASYNC_JOB *job;
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if (pool == NULL || pool->jobs == NULL)
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return;
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do {
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job = sk_ASYNC_JOB_pop(pool->jobs);
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async_job_free(job);
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} while (job);
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}
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int async_init(void)
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{
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if (!CRYPTO_THREAD_init_local(&ctxkey, NULL))
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return 0;
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if (!CRYPTO_THREAD_init_local(&poolkey, NULL)) {
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CRYPTO_THREAD_cleanup_local(&ctxkey);
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return 0;
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}
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return async_local_init();
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}
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void async_deinit(void)
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{
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CRYPTO_THREAD_cleanup_local(&ctxkey);
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CRYPTO_THREAD_cleanup_local(&poolkey);
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async_local_deinit();
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}
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int ASYNC_init_thread(size_t max_size, size_t init_size)
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{
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async_pool *pool;
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size_t curr_size = 0;
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if (init_size > max_size) {
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ERR_raise(ERR_LIB_ASYNC, ASYNC_R_INVALID_POOL_SIZE);
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return 0;
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}
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if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
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return 0;
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if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
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return 0;
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pool = OPENSSL_zalloc(sizeof(*pool));
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if (pool == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
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if (pool->jobs == NULL) {
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ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(pool);
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return 0;
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}
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pool->max_size = max_size;
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/* Pre-create jobs as required */
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while (init_size--) {
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ASYNC_JOB *job;
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job = async_job_new();
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if (job == NULL || !async_fibre_makecontext(&job->fibrectx)) {
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/*
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* Not actually fatal because we already created the pool, just
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* skip creation of any more jobs
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*/
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async_job_free(job);
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break;
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}
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job->funcargs = NULL;
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sk_ASYNC_JOB_push(pool->jobs, job); /* Cannot fail due to reserve */
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curr_size++;
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}
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pool->curr_size = curr_size;
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if (!CRYPTO_THREAD_set_local(&poolkey, pool)) {
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ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SET_POOL);
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goto err;
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}
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return 1;
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err:
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async_empty_pool(pool);
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sk_ASYNC_JOB_free(pool->jobs);
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OPENSSL_free(pool);
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return 0;
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}
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static void async_delete_thread_state(void *arg)
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{
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async_pool *pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
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if (pool != NULL) {
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async_empty_pool(pool);
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sk_ASYNC_JOB_free(pool->jobs);
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OPENSSL_free(pool);
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CRYPTO_THREAD_set_local(&poolkey, NULL);
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}
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async_local_cleanup();
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async_ctx_free();
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}
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void ASYNC_cleanup_thread(void)
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{
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if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
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return;
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async_delete_thread_state(NULL);
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}
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ASYNC_JOB *ASYNC_get_current_job(void)
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{
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async_ctx *ctx;
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if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
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return NULL;
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ctx = async_get_ctx();
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if (ctx == NULL)
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return NULL;
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return ctx->currjob;
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}
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ASYNC_WAIT_CTX *ASYNC_get_wait_ctx(ASYNC_JOB *job)
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{
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return job->waitctx;
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}
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void ASYNC_block_pause(void)
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{
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async_ctx *ctx;
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if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
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return;
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ctx = async_get_ctx();
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if (ctx == NULL || ctx->currjob == NULL) {
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/*
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* We're not in a job anyway so ignore this
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*/
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return;
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}
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ctx->blocked++;
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}
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void ASYNC_unblock_pause(void)
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{
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async_ctx *ctx;
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if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
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return;
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ctx = async_get_ctx();
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if (ctx == NULL || ctx->currjob == NULL) {
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/*
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* We're not in a job anyway so ignore this
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*/
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return;
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}
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if (ctx->blocked > 0)
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ctx->blocked--;
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}
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