From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- crypto/cryptd.c | 1029 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1029 insertions(+) create mode 100644 crypto/cryptd.c (limited to 'crypto/cryptd.c') diff --git a/crypto/cryptd.c b/crypto/cryptd.c new file mode 100644 index 000000000..d8dbf07ab --- /dev/null +++ b/crypto/cryptd.c @@ -0,0 +1,1029 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Software async crypto daemon. + * + * Copyright (c) 2006 Herbert Xu + * + * Added AEAD support to cryptd. + * Authors: Tadeusz Struk (tadeusz.struk@intel.com) + * Adrian Hoban + * Gabriele Paoloni + * Aidan O'Mahony (aidan.o.mahony@intel.com) + * Copyright (c) 2010, Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static unsigned int cryptd_max_cpu_qlen = 1000; +module_param(cryptd_max_cpu_qlen, uint, 0); +MODULE_PARM_DESC(cryptd_max_cpu_qlen, "Set cryptd Max queue depth"); + +static struct workqueue_struct *cryptd_wq; + +struct cryptd_cpu_queue { + local_lock_t bh_lock; + struct crypto_queue queue; + struct work_struct work; +}; + +struct cryptd_queue { + /* + * Protected by disabling BH to allow enqueueing from softinterrupt and + * dequeuing from kworker (cryptd_queue_worker()). + */ + struct cryptd_cpu_queue __percpu *cpu_queue; +}; + +struct cryptd_instance_ctx { + struct crypto_spawn spawn; + struct cryptd_queue *queue; +}; + +struct skcipherd_instance_ctx { + struct crypto_skcipher_spawn spawn; + struct cryptd_queue *queue; +}; + +struct hashd_instance_ctx { + struct crypto_shash_spawn spawn; + struct cryptd_queue *queue; +}; + +struct aead_instance_ctx { + struct crypto_aead_spawn aead_spawn; + struct cryptd_queue *queue; +}; + +struct cryptd_skcipher_ctx { + refcount_t refcnt; + struct crypto_skcipher *child; +}; + +struct cryptd_skcipher_request_ctx { + struct skcipher_request req; +}; + +struct cryptd_hash_ctx { + refcount_t refcnt; + struct crypto_shash *child; +}; + +struct cryptd_hash_request_ctx { + crypto_completion_t complete; + void *data; + struct shash_desc desc; +}; + +struct cryptd_aead_ctx { + refcount_t refcnt; + struct crypto_aead *child; +}; + +struct cryptd_aead_request_ctx { + struct aead_request req; +}; + +static void cryptd_queue_worker(struct work_struct *work); + +static int cryptd_init_queue(struct cryptd_queue *queue, + unsigned int max_cpu_qlen) +{ + int cpu; + struct cryptd_cpu_queue *cpu_queue; + + queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue); + if (!queue->cpu_queue) + return -ENOMEM; + for_each_possible_cpu(cpu) { + cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); + crypto_init_queue(&cpu_queue->queue, max_cpu_qlen); + INIT_WORK(&cpu_queue->work, cryptd_queue_worker); + local_lock_init(&cpu_queue->bh_lock); + } + pr_info("cryptd: max_cpu_qlen set to %d\n", max_cpu_qlen); + return 0; +} + +static void cryptd_fini_queue(struct cryptd_queue *queue) +{ + int cpu; + struct cryptd_cpu_queue *cpu_queue; + + for_each_possible_cpu(cpu) { + cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); + BUG_ON(cpu_queue->queue.qlen); + } + free_percpu(queue->cpu_queue); +} + +static int cryptd_enqueue_request(struct cryptd_queue *queue, + struct crypto_async_request *request) +{ + int err; + struct cryptd_cpu_queue *cpu_queue; + refcount_t *refcnt; + + local_bh_disable(); + local_lock_nested_bh(&queue->cpu_queue->bh_lock); + cpu_queue = this_cpu_ptr(queue->cpu_queue); + err = crypto_enqueue_request(&cpu_queue->queue, request); + + refcnt = crypto_tfm_ctx(request->tfm); + + if (err == -ENOSPC) + goto out; + + queue_work_on(smp_processor_id(), cryptd_wq, &cpu_queue->work); + + if (!refcount_read(refcnt)) + goto out; + + refcount_inc(refcnt); + +out: + local_unlock_nested_bh(&queue->cpu_queue->bh_lock); + local_bh_enable(); + + return err; +} + +/* Called in workqueue context, do one real cryption work (via + * req->complete) and reschedule itself if there are more work to + * do. */ +static void cryptd_queue_worker(struct work_struct *work) +{ + struct cryptd_cpu_queue *cpu_queue; + struct crypto_async_request *req, *backlog; + + cpu_queue = container_of(work, struct cryptd_cpu_queue, work); + /* + * Only handle one request at a time to avoid hogging crypto workqueue. + */ + local_bh_disable(); + __local_lock_nested_bh(&cpu_queue->bh_lock); + backlog = crypto_get_backlog(&cpu_queue->queue); + req = crypto_dequeue_request(&cpu_queue->queue); + __local_unlock_nested_bh(&cpu_queue->bh_lock); + local_bh_enable(); + + if (!req) + return; + + if (backlog) + crypto_request_complete(backlog, -EINPROGRESS); + crypto_request_complete(req, 0); + + if (cpu_queue->queue.qlen) + queue_work(cryptd_wq, &cpu_queue->work); +} + +static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm) +{ + struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); + struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); + return ictx->queue; +} + +static void cryptd_type_and_mask(struct crypto_attr_type *algt, + u32 *type, u32 *mask) +{ + /* + * cryptd is allowed to wrap internal algorithms, but in that case the + * resulting cryptd instance will be marked as internal as well. + */ + *type = algt->type & CRYPTO_ALG_INTERNAL; + *mask = algt->mask & CRYPTO_ALG_INTERNAL; + + /* No point in cryptd wrapping an algorithm that's already async. */ + *mask |= CRYPTO_ALG_ASYNC; + + *mask |= crypto_algt_inherited_mask(algt); +} + +static int cryptd_init_instance(struct crypto_instance *inst, + struct crypto_alg *alg) +{ + if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", + alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + return -ENAMETOOLONG; + + memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); + + inst->alg.cra_priority = alg->cra_priority + 50; + inst->alg.cra_blocksize = alg->cra_blocksize; + inst->alg.cra_alignmask = alg->cra_alignmask; + + return 0; +} + +static int cryptd_skcipher_setkey(struct crypto_skcipher *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(parent); + struct crypto_skcipher *child = ctx->child; + + crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(child, + crypto_skcipher_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + return crypto_skcipher_setkey(child, key, keylen); +} + +static struct skcipher_request *cryptd_skcipher_prepare( + struct skcipher_request *req, int err) +{ + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct skcipher_request *subreq = &rctx->req; + struct cryptd_skcipher_ctx *ctx; + struct crypto_skcipher *child; + + req->base.complete = subreq->base.complete; + req->base.data = subreq->base.data; + + if (unlikely(err == -EINPROGRESS)) + return NULL; + + ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); + child = ctx->child; + + skcipher_request_set_tfm(subreq, child); + skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP, + NULL, NULL); + skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, + req->iv); + + return subreq; +} + +static void cryptd_skcipher_complete(struct skcipher_request *req, int err, + crypto_completion_t complete) +{ + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_request *subreq = &rctx->req; + int refcnt = refcount_read(&ctx->refcnt); + + local_bh_disable(); + skcipher_request_complete(req, err); + local_bh_enable(); + + if (unlikely(err == -EINPROGRESS)) { + subreq->base.complete = req->base.complete; + subreq->base.data = req->base.data; + req->base.complete = complete; + req->base.data = req; + } else if (refcnt && refcount_dec_and_test(&ctx->refcnt)) + crypto_free_skcipher(tfm); +} + +static void cryptd_skcipher_encrypt(void *data, int err) +{ + struct skcipher_request *req = data; + struct skcipher_request *subreq; + + subreq = cryptd_skcipher_prepare(req, err); + if (likely(subreq)) + err = crypto_skcipher_encrypt(subreq); + + cryptd_skcipher_complete(req, err, cryptd_skcipher_encrypt); +} + +static void cryptd_skcipher_decrypt(void *data, int err) +{ + struct skcipher_request *req = data; + struct skcipher_request *subreq; + + subreq = cryptd_skcipher_prepare(req, err); + if (likely(subreq)) + err = crypto_skcipher_decrypt(subreq); + + cryptd_skcipher_complete(req, err, cryptd_skcipher_decrypt); +} + +static int cryptd_skcipher_enqueue(struct skcipher_request *req, + crypto_completion_t compl) +{ + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct skcipher_request *subreq = &rctx->req; + struct cryptd_queue *queue; + + queue = cryptd_get_queue(crypto_skcipher_tfm(tfm)); + subreq->base.complete = req->base.complete; + subreq->base.data = req->base.data; + req->base.complete = compl; + req->base.data = req; + + return cryptd_enqueue_request(queue, &req->base); +} + +static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req) +{ + return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt); +} + +static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req) +{ + return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt); +} + +static int cryptd_skcipher_init_tfm(struct crypto_skcipher *tfm) +{ + struct skcipher_instance *inst = skcipher_alg_instance(tfm); + struct skcipherd_instance_ctx *ictx = skcipher_instance_ctx(inst); + struct crypto_skcipher_spawn *spawn = &ictx->spawn; + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + struct crypto_skcipher *cipher; + + cipher = crypto_spawn_skcipher(spawn); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + ctx->child = cipher; + crypto_skcipher_set_reqsize( + tfm, sizeof(struct cryptd_skcipher_request_ctx) + + crypto_skcipher_reqsize(cipher)); + return 0; +} + +static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + + crypto_free_skcipher(ctx->child); +} + +static void cryptd_skcipher_free(struct skcipher_instance *inst) +{ + struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst); + + crypto_drop_skcipher(&ctx->spawn); + kfree(inst); +} + +static int cryptd_create_skcipher(struct crypto_template *tmpl, + struct rtattr **tb, + struct crypto_attr_type *algt, + struct cryptd_queue *queue) +{ + struct skcipherd_instance_ctx *ctx; + struct skcipher_instance *inst; + struct skcipher_alg_common *alg; + u32 type; + u32 mask; + int err; + + cryptd_type_and_mask(algt, &type, &mask); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = skcipher_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), type, mask); + if (err) + goto err_free_inst; + + alg = crypto_spawn_skcipher_alg_common(&ctx->spawn); + err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base); + if (err) + goto err_free_inst; + + inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC | + (alg->base.cra_flags & CRYPTO_ALG_INTERNAL); + inst->alg.ivsize = alg->ivsize; + inst->alg.chunksize = alg->chunksize; + inst->alg.min_keysize = alg->min_keysize; + inst->alg.max_keysize = alg->max_keysize; + + inst->alg.base.cra_ctxsize = sizeof(struct cryptd_skcipher_ctx); + + inst->alg.init = cryptd_skcipher_init_tfm; + inst->alg.exit = cryptd_skcipher_exit_tfm; + + inst->alg.setkey = cryptd_skcipher_setkey; + inst->alg.encrypt = cryptd_skcipher_encrypt_enqueue; + inst->alg.decrypt = cryptd_skcipher_decrypt_enqueue; + + inst->free = cryptd_skcipher_free; + + err = skcipher_register_instance(tmpl, inst); + if (err) { +err_free_inst: + cryptd_skcipher_free(inst); + } + return err; +} + +static int cryptd_hash_init_tfm(struct crypto_ahash *tfm) +{ + struct ahash_instance *inst = ahash_alg_instance(tfm); + struct hashd_instance_ctx *ictx = ahash_instance_ctx(inst); + struct crypto_shash_spawn *spawn = &ictx->spawn; + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct crypto_shash *hash; + + hash = crypto_spawn_shash(spawn); + if (IS_ERR(hash)) + return PTR_ERR(hash); + + ctx->child = hash; + crypto_ahash_set_reqsize(tfm, + sizeof(struct cryptd_hash_request_ctx) + + crypto_shash_descsize(hash)); + return 0; +} + +static void cryptd_hash_exit_tfm(struct crypto_ahash *tfm) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + + crypto_free_shash(ctx->child); +} + +static int cryptd_hash_setkey(struct crypto_ahash *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent); + struct crypto_shash *child = ctx->child; + + crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + return crypto_shash_setkey(child, key, keylen); +} + +static int cryptd_hash_enqueue(struct ahash_request *req, + crypto_completion_t compl) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_queue *queue = + cryptd_get_queue(crypto_ahash_tfm(tfm)); + + rctx->complete = req->base.complete; + rctx->data = req->base.data; + req->base.complete = compl; + req->base.data = req; + + return cryptd_enqueue_request(queue, &req->base); +} + +static struct shash_desc *cryptd_hash_prepare(struct ahash_request *req, + int err) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + + req->base.complete = rctx->complete; + req->base.data = rctx->data; + + if (unlikely(err == -EINPROGRESS)) + return NULL; + + return &rctx->desc; +} + +static void cryptd_hash_complete(struct ahash_request *req, int err, + crypto_completion_t complete) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + int refcnt = refcount_read(&ctx->refcnt); + + local_bh_disable(); + ahash_request_complete(req, err); + local_bh_enable(); + + if (err == -EINPROGRESS) { + req->base.complete = complete; + req->base.data = req; + } else if (refcnt && refcount_dec_and_test(&ctx->refcnt)) + crypto_free_ahash(tfm); +} + +static void cryptd_hash_init(void *data, int err) +{ + struct ahash_request *req = data; + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct crypto_shash *child = ctx->child; + struct shash_desc *desc; + + desc = cryptd_hash_prepare(req, err); + if (unlikely(!desc)) + goto out; + + desc->tfm = child; + + err = crypto_shash_init(desc); + +out: + cryptd_hash_complete(req, err, cryptd_hash_init); +} + +static int cryptd_hash_init_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_init); +} + +static void cryptd_hash_update(void *data, int err) +{ + struct ahash_request *req = data; + struct shash_desc *desc; + + desc = cryptd_hash_prepare(req, err); + if (likely(desc)) + err = shash_ahash_update(req, desc); + + cryptd_hash_complete(req, err, cryptd_hash_update); +} + +static int cryptd_hash_update_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_update); +} + +static void cryptd_hash_final(void *data, int err) +{ + struct ahash_request *req = data; + struct shash_desc *desc; + + desc = cryptd_hash_prepare(req, err); + if (likely(desc)) + err = crypto_shash_final(desc, req->result); + + cryptd_hash_complete(req, err, cryptd_hash_final); +} + +static int cryptd_hash_final_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_final); +} + +static void cryptd_hash_finup(void *data, int err) +{ + struct ahash_request *req = data; + struct shash_desc *desc; + + desc = cryptd_hash_prepare(req, err); + if (likely(desc)) + err = shash_ahash_finup(req, desc); + + cryptd_hash_complete(req, err, cryptd_hash_finup); +} + +static int cryptd_hash_finup_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_finup); +} + +static void cryptd_hash_digest(void *data, int err) +{ + struct ahash_request *req = data; + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct crypto_shash *child = ctx->child; + struct shash_desc *desc; + + desc = cryptd_hash_prepare(req, err); + if (unlikely(!desc)) + goto out; + + desc->tfm = child; + + err = shash_ahash_digest(req, desc); + +out: + cryptd_hash_complete(req, err, cryptd_hash_digest); +} + +static int cryptd_hash_digest_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_digest); +} + +static int cryptd_hash_export(struct ahash_request *req, void *out) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + + return crypto_shash_export(&rctx->desc, out); +} + +static int cryptd_hash_import(struct ahash_request *req, const void *in) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + struct shash_desc *desc = &rctx->desc; + + desc->tfm = ctx->child; + + return crypto_shash_import(desc, in); +} + +static void cryptd_hash_free(struct ahash_instance *inst) +{ + struct hashd_instance_ctx *ctx = ahash_instance_ctx(inst); + + crypto_drop_shash(&ctx->spawn); + kfree(inst); +} + +static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb, + struct crypto_attr_type *algt, + struct cryptd_queue *queue) +{ + struct hashd_instance_ctx *ctx; + struct ahash_instance *inst; + struct shash_alg *alg; + u32 type; + u32 mask; + int err; + + cryptd_type_and_mask(algt, &type, &mask); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = ahash_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_grab_shash(&ctx->spawn, ahash_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), type, mask); + if (err) + goto err_free_inst; + alg = crypto_spawn_shash_alg(&ctx->spawn); + + err = cryptd_init_instance(ahash_crypto_instance(inst), &alg->base); + if (err) + goto err_free_inst; + + inst->alg.halg.base.cra_flags |= CRYPTO_ALG_ASYNC | + (alg->base.cra_flags & (CRYPTO_ALG_INTERNAL| + CRYPTO_ALG_OPTIONAL_KEY)); + inst->alg.halg.digestsize = alg->digestsize; + inst->alg.halg.statesize = alg->statesize; + inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx); + + inst->alg.init_tfm = cryptd_hash_init_tfm; + inst->alg.exit_tfm = cryptd_hash_exit_tfm; + + inst->alg.init = cryptd_hash_init_enqueue; + inst->alg.update = cryptd_hash_update_enqueue; + inst->alg.final = cryptd_hash_final_enqueue; + inst->alg.finup = cryptd_hash_finup_enqueue; + inst->alg.export = cryptd_hash_export; + inst->alg.import = cryptd_hash_import; + if (crypto_shash_alg_has_setkey(alg)) + inst->alg.setkey = cryptd_hash_setkey; + inst->alg.digest = cryptd_hash_digest_enqueue; + + inst->free = cryptd_hash_free; + + err = ahash_register_instance(tmpl, inst); + if (err) { +err_free_inst: + cryptd_hash_free(inst); + } + return err; +} + +static int cryptd_aead_setkey(struct crypto_aead *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent); + struct crypto_aead *child = ctx->child; + + return crypto_aead_setkey(child, key, keylen); +} + +static int cryptd_aead_setauthsize(struct crypto_aead *parent, + unsigned int authsize) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent); + struct crypto_aead *child = ctx->child; + + return crypto_aead_setauthsize(child, authsize); +} + +static void cryptd_aead_crypt(struct aead_request *req, + struct crypto_aead *child, int err, + int (*crypt)(struct aead_request *req), + crypto_completion_t compl) +{ + struct cryptd_aead_request_ctx *rctx; + struct aead_request *subreq; + struct cryptd_aead_ctx *ctx; + struct crypto_aead *tfm; + int refcnt; + + rctx = aead_request_ctx(req); + subreq = &rctx->req; + req->base.complete = subreq->base.complete; + req->base.data = subreq->base.data; + + tfm = crypto_aead_reqtfm(req); + + if (unlikely(err == -EINPROGRESS)) + goto out; + + aead_request_set_tfm(subreq, child); + aead_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP, + NULL, NULL); + aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, + req->iv); + aead_request_set_ad(subreq, req->assoclen); + + err = crypt(subreq); + +out: + ctx = crypto_aead_ctx(tfm); + refcnt = refcount_read(&ctx->refcnt); + + local_bh_disable(); + aead_request_complete(req, err); + local_bh_enable(); + + if (err == -EINPROGRESS) { + subreq->base.complete = req->base.complete; + subreq->base.data = req->base.data; + req->base.complete = compl; + req->base.data = req; + } else if (refcnt && refcount_dec_and_test(&ctx->refcnt)) + crypto_free_aead(tfm); +} + +static void cryptd_aead_encrypt(void *data, int err) +{ + struct aead_request *req = data; + struct cryptd_aead_ctx *ctx; + struct crypto_aead *child; + + ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); + child = ctx->child; + cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt, + cryptd_aead_encrypt); +} + +static void cryptd_aead_decrypt(void *data, int err) +{ + struct aead_request *req = data; + struct cryptd_aead_ctx *ctx; + struct crypto_aead *child; + + ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); + child = ctx->child; + cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt, + cryptd_aead_decrypt); +} + +static int cryptd_aead_enqueue(struct aead_request *req, + crypto_completion_t compl) +{ + struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req); + struct crypto_aead *tfm = crypto_aead_reqtfm(req); + struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm)); + struct aead_request *subreq = &rctx->req; + + subreq->base.complete = req->base.complete; + subreq->base.data = req->base.data; + req->base.complete = compl; + req->base.data = req; + return cryptd_enqueue_request(queue, &req->base); +} + +static int cryptd_aead_encrypt_enqueue(struct aead_request *req) +{ + return cryptd_aead_enqueue(req, cryptd_aead_encrypt ); +} + +static int cryptd_aead_decrypt_enqueue(struct aead_request *req) +{ + return cryptd_aead_enqueue(req, cryptd_aead_decrypt ); +} + +static int cryptd_aead_init_tfm(struct crypto_aead *tfm) +{ + struct aead_instance *inst = aead_alg_instance(tfm); + struct aead_instance_ctx *ictx = aead_instance_ctx(inst); + struct crypto_aead_spawn *spawn = &ictx->aead_spawn; + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm); + struct crypto_aead *cipher; + + cipher = crypto_spawn_aead(spawn); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + ctx->child = cipher; + crypto_aead_set_reqsize( + tfm, sizeof(struct cryptd_aead_request_ctx) + + crypto_aead_reqsize(cipher)); + return 0; +} + +static void cryptd_aead_exit_tfm(struct crypto_aead *tfm) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm); + crypto_free_aead(ctx->child); +} + +static void cryptd_aead_free(struct aead_instance *inst) +{ + struct aead_instance_ctx *ctx = aead_instance_ctx(inst); + + crypto_drop_aead(&ctx->aead_spawn); + kfree(inst); +} + +static int cryptd_create_aead(struct crypto_template *tmpl, + struct rtattr **tb, + struct crypto_attr_type *algt, + struct cryptd_queue *queue) +{ + struct aead_instance_ctx *ctx; + struct aead_instance *inst; + struct aead_alg *alg; + u32 type; + u32 mask; + int err; + + cryptd_type_and_mask(algt, &type, &mask); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = aead_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), type, mask); + if (err) + goto err_free_inst; + + alg = crypto_spawn_aead_alg(&ctx->aead_spawn); + err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base); + if (err) + goto err_free_inst; + + inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC | + (alg->base.cra_flags & CRYPTO_ALG_INTERNAL); + inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx); + + inst->alg.ivsize = crypto_aead_alg_ivsize(alg); + inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); + + inst->alg.init = cryptd_aead_init_tfm; + inst->alg.exit = cryptd_aead_exit_tfm; + inst->alg.setkey = cryptd_aead_setkey; + inst->alg.setauthsize = cryptd_aead_setauthsize; + inst->alg.encrypt = cryptd_aead_encrypt_enqueue; + inst->alg.decrypt = cryptd_aead_decrypt_enqueue; + + inst->free = cryptd_aead_free; + + err = aead_register_instance(tmpl, inst); + if (err) { +err_free_inst: + cryptd_aead_free(inst); + } + return err; +} + +static struct cryptd_queue queue; + +static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct crypto_attr_type *algt; + + algt = crypto_get_attr_type(tb); + if (IS_ERR(algt)) + return PTR_ERR(algt); + + switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { + case CRYPTO_ALG_TYPE_LSKCIPHER: + return cryptd_create_skcipher(tmpl, tb, algt, &queue); + case CRYPTO_ALG_TYPE_HASH: + return cryptd_create_hash(tmpl, tb, algt, &queue); + case CRYPTO_ALG_TYPE_AEAD: + return cryptd_create_aead(tmpl, tb, algt, &queue); + } + + return -EINVAL; +} + +static struct crypto_template cryptd_tmpl = { + .name = "cryptd", + .create = cryptd_create, + .module = THIS_MODULE, +}; + +struct cryptd_aead *cryptd_alloc_aead(const char *alg_name, + u32 type, u32 mask) +{ + char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; + struct cryptd_aead_ctx *ctx; + struct crypto_aead *tfm; + + if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-EINVAL); + tfm = crypto_alloc_aead(cryptd_alg_name, type, mask); + if (IS_ERR(tfm)) + return ERR_CAST(tfm); + if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { + crypto_free_aead(tfm); + return ERR_PTR(-EINVAL); + } + + ctx = crypto_aead_ctx(tfm); + refcount_set(&ctx->refcnt, 1); + + return __cryptd_aead_cast(tfm); +} +EXPORT_SYMBOL_GPL(cryptd_alloc_aead); + +struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm) +{ + struct cryptd_aead_ctx *ctx; + ctx = crypto_aead_ctx(&tfm->base); + return ctx->child; +} +EXPORT_SYMBOL_GPL(cryptd_aead_child); + +bool cryptd_aead_queued(struct cryptd_aead *tfm) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base); + + return refcount_read(&ctx->refcnt) - 1; +} +EXPORT_SYMBOL_GPL(cryptd_aead_queued); + +void cryptd_free_aead(struct cryptd_aead *tfm) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base); + + if (refcount_dec_and_test(&ctx->refcnt)) + crypto_free_aead(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_aead); + +static int __init cryptd_init(void) +{ + int err; + + cryptd_wq = alloc_workqueue("cryptd", + WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE | WQ_PERCPU, + 1); + if (!cryptd_wq) + return -ENOMEM; + + err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen); + if (err) + goto err_destroy_wq; + + err = crypto_register_template(&cryptd_tmpl); + if (err) + goto err_fini_queue; + + return 0; + +err_fini_queue: + cryptd_fini_queue(&queue); +err_destroy_wq: + destroy_workqueue(cryptd_wq); + return err; +} + +static void __exit cryptd_exit(void) +{ + destroy_workqueue(cryptd_wq); + cryptd_fini_queue(&queue); + crypto_unregister_template(&cryptd_tmpl); +} + +module_init(cryptd_init); +module_exit(cryptd_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Software async crypto daemon"); +MODULE_ALIAS_CRYPTO("cryptd"); -- cgit v1.3.1