From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- crypto/aead.c | 313 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 313 insertions(+) create mode 100644 crypto/aead.c (limited to 'crypto/aead.c') diff --git a/crypto/aead.c b/crypto/aead.c new file mode 100644 index 000000000..045b74c37 --- /dev/null +++ b/crypto/aead.c @@ -0,0 +1,313 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * AEAD: Authenticated Encryption with Associated Data + * + * This file provides API support for AEAD algorithms. + * + * Copyright (c) 2007-2015 Herbert Xu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key, + unsigned int keylen) +{ + unsigned long alignmask = crypto_aead_alignmask(tfm); + int ret; + u8 *buffer, *alignbuffer; + unsigned long absize; + + absize = keylen + alignmask; + buffer = kmalloc(absize, GFP_ATOMIC); + if (!buffer) + return -ENOMEM; + + alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); + memcpy(alignbuffer, key, keylen); + ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen); + kfree_sensitive(buffer); + return ret; +} + +int crypto_aead_setkey(struct crypto_aead *tfm, + const u8 *key, unsigned int keylen) +{ + unsigned long alignmask = crypto_aead_alignmask(tfm); + int err; + + if ((unsigned long)key & alignmask) + err = setkey_unaligned(tfm, key, keylen); + else + err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen); + + if (unlikely(err)) { + crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY); + return err; + } + + crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); + return 0; +} +EXPORT_SYMBOL_GPL(crypto_aead_setkey); + +int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize) +{ + int err; + + if ((!authsize && crypto_aead_maxauthsize(tfm)) || + authsize > crypto_aead_maxauthsize(tfm)) + return -EINVAL; + + if (crypto_aead_alg(tfm)->setauthsize) { + err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize); + if (err) + return err; + } + + tfm->authsize = authsize; + return 0; +} +EXPORT_SYMBOL_GPL(crypto_aead_setauthsize); + +int crypto_aead_encrypt(struct aead_request *req) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + + if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + + return crypto_aead_alg(aead)->encrypt(req); +} +EXPORT_SYMBOL_GPL(crypto_aead_encrypt); + +int crypto_aead_decrypt(struct aead_request *req) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + + if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + + if (req->cryptlen < crypto_aead_authsize(aead)) + return -EINVAL; + + return crypto_aead_alg(aead)->decrypt(req); +} +EXPORT_SYMBOL_GPL(crypto_aead_decrypt); + +static void crypto_aead_exit_tfm(struct crypto_tfm *tfm) +{ + struct crypto_aead *aead = __crypto_aead_cast(tfm); + struct aead_alg *alg = crypto_aead_alg(aead); + + alg->exit(aead); +} + +static int crypto_aead_init_tfm(struct crypto_tfm *tfm) +{ + struct crypto_aead *aead = __crypto_aead_cast(tfm); + struct aead_alg *alg = crypto_aead_alg(aead); + + crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY); + crypto_aead_set_reqsize(aead, crypto_tfm_alg_reqsize(tfm)); + + aead->authsize = alg->maxauthsize; + + if (alg->exit) + aead->base.exit = crypto_aead_exit_tfm; + + if (alg->init) + return alg->init(aead); + + return 0; +} + +static int __maybe_unused crypto_aead_report( + struct sk_buff *skb, struct crypto_alg *alg) +{ + struct aead_alg *aead = container_of(alg, struct aead_alg, base); + struct crypto_report_aead raead = { + .type = "aead", + .geniv = "", + }; + + raead.blocksize = alg->cra_blocksize; + raead.maxauthsize = aead->maxauthsize; + raead.ivsize = aead->ivsize; + + return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead); +} + +static void __maybe_unused crypto_aead_show(struct seq_file *m, + struct crypto_alg *alg) +{ + struct aead_alg *aead = container_of(alg, struct aead_alg, base); + + seq_printf(m, "type : aead\n"); + seq_printf(m, "async : %s\n", + str_yes_no(alg->cra_flags & CRYPTO_ALG_ASYNC)); + seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); + seq_printf(m, "ivsize : %u\n", aead->ivsize); + seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); + seq_printf(m, "geniv : \n"); +} + +static void crypto_aead_free_instance(struct crypto_instance *inst) +{ + struct aead_instance *aead = aead_instance(inst); + + aead->free(aead); +} + +static const struct crypto_type crypto_aead_type = { + .extsize = crypto_alg_extsize, + .init_tfm = crypto_aead_init_tfm, + .free = crypto_aead_free_instance, +#ifdef CONFIG_PROC_FS + .show = crypto_aead_show, +#endif +#if IS_ENABLED(CONFIG_CRYPTO_USER) + .report = crypto_aead_report, +#endif + .maskclear = ~CRYPTO_ALG_TYPE_MASK, + .maskset = CRYPTO_ALG_TYPE_MASK, + .type = CRYPTO_ALG_TYPE_AEAD, + .tfmsize = offsetof(struct crypto_aead, base), + .algsize = offsetof(struct aead_alg, base), +}; + +int crypto_grab_aead(struct crypto_aead_spawn *spawn, + struct crypto_instance *inst, + const char *name, u32 type, u32 mask) +{ + spawn->base.frontend = &crypto_aead_type; + return crypto_grab_spawn(&spawn->base, inst, name, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_grab_aead); + +struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) +{ + return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_alloc_aead); + +struct crypto_sync_aead *crypto_alloc_sync_aead(const char *alg_name, u32 type, u32 mask) +{ + struct crypto_aead *tfm; + + /* Only sync algorithms are allowed. */ + mask |= CRYPTO_ALG_ASYNC; + type &= ~(CRYPTO_ALG_ASYNC); + + tfm = crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); + + if (!IS_ERR(tfm) && WARN_ON(crypto_aead_reqsize(tfm) > MAX_SYNC_AEAD_REQSIZE)) { + crypto_free_aead(tfm); + return ERR_PTR(-EINVAL); + } + + return (struct crypto_sync_aead *)tfm; +} +EXPORT_SYMBOL_GPL(crypto_alloc_sync_aead); + +int crypto_has_aead(const char *alg_name, u32 type, u32 mask) +{ + return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_has_aead); + +static int aead_prepare_alg(struct aead_alg *alg) +{ + struct crypto_alg *base = &alg->base; + + if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) > + PAGE_SIZE / 8) + return -EINVAL; + + if (!alg->chunksize) + alg->chunksize = base->cra_blocksize; + + base->cra_type = &crypto_aead_type; + base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; + base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; + + return 0; +} + +int crypto_register_aead(struct aead_alg *alg) +{ + struct crypto_alg *base = &alg->base; + int err; + + err = aead_prepare_alg(alg); + if (err) + return err; + + return crypto_register_alg(base); +} +EXPORT_SYMBOL_GPL(crypto_register_aead); + +void crypto_unregister_aead(struct aead_alg *alg) +{ + crypto_unregister_alg(&alg->base); +} +EXPORT_SYMBOL_GPL(crypto_unregister_aead); + +int crypto_register_aeads(struct aead_alg *algs, int count) +{ + int i, ret; + + for (i = 0; i < count; i++) { + ret = crypto_register_aead(&algs[i]); + if (ret) + goto err; + } + + return 0; + +err: + for (--i; i >= 0; --i) + crypto_unregister_aead(&algs[i]); + + return ret; +} +EXPORT_SYMBOL_GPL(crypto_register_aeads); + +void crypto_unregister_aeads(struct aead_alg *algs, int count) +{ + int i; + + for (i = count - 1; i >= 0; --i) + crypto_unregister_aead(&algs[i]); +} +EXPORT_SYMBOL_GPL(crypto_unregister_aeads); + +int aead_register_instance(struct crypto_template *tmpl, + struct aead_instance *inst) +{ + int err; + + if (WARN_ON(!inst->free)) + return -EINVAL; + + err = aead_prepare_alg(&inst->alg); + if (err) + return err; + + return crypto_register_instance(tmpl, aead_crypto_instance(inst)); +} +EXPORT_SYMBOL_GPL(aead_register_instance); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)"); -- cgit v1.3.1