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4943ba16bb
This adds the module loading prefix "crypto-" to the template lookup as well. For example, attempting to load 'vfat(blowfish)' via AF_ALG now correctly includes the "crypto-" prefix at every level, correctly rejecting "vfat": net-pf-38 algif-hash crypto-vfat(blowfish) crypto-vfat(blowfish)-all crypto-vfat Reported-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
569 lines
15 KiB
C
569 lines
15 KiB
C
/*
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* pcrypt - Parallel crypto wrapper.
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*
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* Copyright (C) 2009 secunet Security Networks AG
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* Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/aead.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/notifier.h>
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#include <linux/kobject.h>
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#include <linux/cpu.h>
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#include <crypto/pcrypt.h>
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struct padata_pcrypt {
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struct padata_instance *pinst;
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struct workqueue_struct *wq;
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/*
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* Cpumask for callback CPUs. It should be
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* equal to serial cpumask of corresponding padata instance,
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* so it is updated when padata notifies us about serial
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* cpumask change.
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*
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* cb_cpumask is protected by RCU. This fact prevents us from
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* using cpumask_var_t directly because the actual type of
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* cpumsak_var_t depends on kernel configuration(particularly on
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* CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
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* cpumask_var_t may be either a pointer to the struct cpumask
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* or a variable allocated on the stack. Thus we can not safely use
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* cpumask_var_t with RCU operations such as rcu_assign_pointer or
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* rcu_dereference. So cpumask_var_t is wrapped with struct
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* pcrypt_cpumask which makes possible to use it with RCU.
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*/
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struct pcrypt_cpumask {
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cpumask_var_t mask;
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} *cb_cpumask;
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struct notifier_block nblock;
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};
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static struct padata_pcrypt pencrypt;
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static struct padata_pcrypt pdecrypt;
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static struct kset *pcrypt_kset;
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struct pcrypt_instance_ctx {
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struct crypto_spawn spawn;
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unsigned int tfm_count;
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};
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struct pcrypt_aead_ctx {
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struct crypto_aead *child;
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unsigned int cb_cpu;
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};
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static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
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struct padata_pcrypt *pcrypt)
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{
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unsigned int cpu_index, cpu, i;
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struct pcrypt_cpumask *cpumask;
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cpu = *cb_cpu;
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rcu_read_lock_bh();
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cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
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if (cpumask_test_cpu(cpu, cpumask->mask))
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goto out;
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if (!cpumask_weight(cpumask->mask))
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goto out;
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cpu_index = cpu % cpumask_weight(cpumask->mask);
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cpu = cpumask_first(cpumask->mask);
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for (i = 0; i < cpu_index; i++)
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cpu = cpumask_next(cpu, cpumask->mask);
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*cb_cpu = cpu;
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out:
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rcu_read_unlock_bh();
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return padata_do_parallel(pcrypt->pinst, padata, cpu);
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}
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static int pcrypt_aead_setkey(struct crypto_aead *parent,
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const u8 *key, unsigned int keylen)
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{
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struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
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return crypto_aead_setkey(ctx->child, key, keylen);
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}
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static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
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unsigned int authsize)
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{
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struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
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return crypto_aead_setauthsize(ctx->child, authsize);
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}
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static void pcrypt_aead_serial(struct padata_priv *padata)
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{
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struct pcrypt_request *preq = pcrypt_padata_request(padata);
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struct aead_request *req = pcrypt_request_ctx(preq);
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aead_request_complete(req->base.data, padata->info);
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}
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static void pcrypt_aead_giv_serial(struct padata_priv *padata)
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{
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struct pcrypt_request *preq = pcrypt_padata_request(padata);
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struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
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aead_request_complete(req->areq.base.data, padata->info);
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}
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static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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struct pcrypt_request *preq = aead_request_ctx(req);
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struct padata_priv *padata = pcrypt_request_padata(preq);
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padata->info = err;
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req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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padata_do_serial(padata);
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}
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static void pcrypt_aead_enc(struct padata_priv *padata)
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{
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struct pcrypt_request *preq = pcrypt_padata_request(padata);
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struct aead_request *req = pcrypt_request_ctx(preq);
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padata->info = crypto_aead_encrypt(req);
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if (padata->info == -EINPROGRESS)
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return;
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padata_do_serial(padata);
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}
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static int pcrypt_aead_encrypt(struct aead_request *req)
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{
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int err;
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struct pcrypt_request *preq = aead_request_ctx(req);
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struct aead_request *creq = pcrypt_request_ctx(preq);
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struct padata_priv *padata = pcrypt_request_padata(preq);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
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u32 flags = aead_request_flags(req);
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memset(padata, 0, sizeof(struct padata_priv));
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padata->parallel = pcrypt_aead_enc;
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padata->serial = pcrypt_aead_serial;
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aead_request_set_tfm(creq, ctx->child);
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aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
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pcrypt_aead_done, req);
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aead_request_set_crypt(creq, req->src, req->dst,
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req->cryptlen, req->iv);
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aead_request_set_assoc(creq, req->assoc, req->assoclen);
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err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
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if (!err)
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return -EINPROGRESS;
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return err;
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}
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static void pcrypt_aead_dec(struct padata_priv *padata)
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{
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struct pcrypt_request *preq = pcrypt_padata_request(padata);
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struct aead_request *req = pcrypt_request_ctx(preq);
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padata->info = crypto_aead_decrypt(req);
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if (padata->info == -EINPROGRESS)
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return;
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padata_do_serial(padata);
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}
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static int pcrypt_aead_decrypt(struct aead_request *req)
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{
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int err;
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struct pcrypt_request *preq = aead_request_ctx(req);
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struct aead_request *creq = pcrypt_request_ctx(preq);
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struct padata_priv *padata = pcrypt_request_padata(preq);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
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u32 flags = aead_request_flags(req);
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memset(padata, 0, sizeof(struct padata_priv));
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padata->parallel = pcrypt_aead_dec;
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padata->serial = pcrypt_aead_serial;
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aead_request_set_tfm(creq, ctx->child);
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aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
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pcrypt_aead_done, req);
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aead_request_set_crypt(creq, req->src, req->dst,
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req->cryptlen, req->iv);
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aead_request_set_assoc(creq, req->assoc, req->assoclen);
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err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
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if (!err)
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return -EINPROGRESS;
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return err;
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}
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static void pcrypt_aead_givenc(struct padata_priv *padata)
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{
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struct pcrypt_request *preq = pcrypt_padata_request(padata);
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struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
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padata->info = crypto_aead_givencrypt(req);
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if (padata->info == -EINPROGRESS)
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return;
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padata_do_serial(padata);
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}
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static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
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{
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int err;
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struct aead_request *areq = &req->areq;
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struct pcrypt_request *preq = aead_request_ctx(areq);
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struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq);
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struct padata_priv *padata = pcrypt_request_padata(preq);
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struct crypto_aead *aead = aead_givcrypt_reqtfm(req);
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struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
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u32 flags = aead_request_flags(areq);
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memset(padata, 0, sizeof(struct padata_priv));
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padata->parallel = pcrypt_aead_givenc;
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padata->serial = pcrypt_aead_giv_serial;
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aead_givcrypt_set_tfm(creq, ctx->child);
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aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
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pcrypt_aead_done, areq);
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aead_givcrypt_set_crypt(creq, areq->src, areq->dst,
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areq->cryptlen, areq->iv);
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aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);
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aead_givcrypt_set_giv(creq, req->giv, req->seq);
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err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
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if (!err)
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return -EINPROGRESS;
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return err;
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}
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static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
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{
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int cpu, cpu_index;
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_aead *cipher;
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ictx->tfm_count++;
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cpu_index = ictx->tfm_count % cpumask_weight(cpu_online_mask);
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ctx->cb_cpu = cpumask_first(cpu_online_mask);
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for (cpu = 0; cpu < cpu_index; cpu++)
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ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
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cipher = crypto_spawn_aead(crypto_instance_ctx(inst));
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)
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+ sizeof(struct aead_givcrypt_request)
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+ crypto_aead_reqsize(cipher);
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return 0;
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}
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static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm)
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{
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struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_aead(ctx->child);
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}
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static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg)
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{
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struct crypto_instance *inst;
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struct pcrypt_instance_ctx *ctx;
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int err;
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inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
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if (!inst) {
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inst = ERR_PTR(-ENOMEM);
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goto out;
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}
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
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goto out_free_inst;
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memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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ctx = crypto_instance_ctx(inst);
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err = crypto_init_spawn(&ctx->spawn, alg, inst,
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CRYPTO_ALG_TYPE_MASK);
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if (err)
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goto out_free_inst;
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inst->alg.cra_priority = alg->cra_priority + 100;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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out:
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return inst;
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out_free_inst:
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kfree(inst);
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inst = ERR_PTR(err);
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goto out;
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}
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static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb,
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u32 type, u32 mask)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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alg = crypto_get_attr_alg(tb, type, (mask & CRYPTO_ALG_TYPE_MASK));
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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inst = pcrypt_alloc_instance(alg);
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if (IS_ERR(inst))
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goto out_put_alg;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
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inst->alg.cra_type = &crypto_aead_type;
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inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
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inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
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inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
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inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
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inst->alg.cra_init = pcrypt_aead_init_tfm;
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inst->alg.cra_exit = pcrypt_aead_exit_tfm;
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inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
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inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
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inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
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inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
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inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;
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out_put_alg:
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crypto_mod_put(alg);
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return inst;
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}
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static struct crypto_instance *pcrypt_alloc(struct rtattr **tb)
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{
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struct crypto_attr_type *algt;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return ERR_CAST(algt);
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switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
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case CRYPTO_ALG_TYPE_AEAD:
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return pcrypt_alloc_aead(tb, algt->type, algt->mask);
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}
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return ERR_PTR(-EINVAL);
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}
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static void pcrypt_free(struct crypto_instance *inst)
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{
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struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
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crypto_drop_spawn(&ctx->spawn);
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kfree(inst);
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}
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static int pcrypt_cpumask_change_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct padata_pcrypt *pcrypt;
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struct pcrypt_cpumask *new_mask, *old_mask;
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struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
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if (!(val & PADATA_CPU_SERIAL))
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return 0;
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pcrypt = container_of(self, struct padata_pcrypt, nblock);
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new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
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if (!new_mask)
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return -ENOMEM;
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if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
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kfree(new_mask);
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return -ENOMEM;
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}
|
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old_mask = pcrypt->cb_cpumask;
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cpumask_copy(new_mask->mask, cpumask->cbcpu);
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rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
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synchronize_rcu_bh();
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|
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free_cpumask_var(old_mask->mask);
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kfree(old_mask);
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return 0;
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}
|
|
|
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static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
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{
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int ret;
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pinst->kobj.kset = pcrypt_kset;
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ret = kobject_add(&pinst->kobj, NULL, name);
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if (!ret)
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kobject_uevent(&pinst->kobj, KOBJ_ADD);
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return ret;
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}
|
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|
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static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
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const char *name)
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{
|
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int ret = -ENOMEM;
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struct pcrypt_cpumask *mask;
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|
|
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get_online_cpus();
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pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
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1, name);
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if (!pcrypt->wq)
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goto err;
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|
|
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pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
|
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if (!pcrypt->pinst)
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goto err_destroy_workqueue;
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|
|
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mask = kmalloc(sizeof(*mask), GFP_KERNEL);
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if (!mask)
|
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goto err_free_padata;
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if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
|
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kfree(mask);
|
|
goto err_free_padata;
|
|
}
|
|
|
|
cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
|
|
rcu_assign_pointer(pcrypt->cb_cpumask, mask);
|
|
|
|
pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
|
|
ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
|
|
if (ret)
|
|
goto err_free_cpumask;
|
|
|
|
ret = pcrypt_sysfs_add(pcrypt->pinst, name);
|
|
if (ret)
|
|
goto err_unregister_notifier;
|
|
|
|
put_online_cpus();
|
|
|
|
return ret;
|
|
|
|
err_unregister_notifier:
|
|
padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
|
|
err_free_cpumask:
|
|
free_cpumask_var(mask->mask);
|
|
kfree(mask);
|
|
err_free_padata:
|
|
padata_free(pcrypt->pinst);
|
|
err_destroy_workqueue:
|
|
destroy_workqueue(pcrypt->wq);
|
|
err:
|
|
put_online_cpus();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
|
|
{
|
|
free_cpumask_var(pcrypt->cb_cpumask->mask);
|
|
kfree(pcrypt->cb_cpumask);
|
|
|
|
padata_stop(pcrypt->pinst);
|
|
padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
|
|
destroy_workqueue(pcrypt->wq);
|
|
padata_free(pcrypt->pinst);
|
|
}
|
|
|
|
static struct crypto_template pcrypt_tmpl = {
|
|
.name = "pcrypt",
|
|
.alloc = pcrypt_alloc,
|
|
.free = pcrypt_free,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init pcrypt_init(void)
|
|
{
|
|
int err = -ENOMEM;
|
|
|
|
pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
|
|
if (!pcrypt_kset)
|
|
goto err;
|
|
|
|
err = pcrypt_init_padata(&pencrypt, "pencrypt");
|
|
if (err)
|
|
goto err_unreg_kset;
|
|
|
|
err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
|
|
if (err)
|
|
goto err_deinit_pencrypt;
|
|
|
|
padata_start(pencrypt.pinst);
|
|
padata_start(pdecrypt.pinst);
|
|
|
|
return crypto_register_template(&pcrypt_tmpl);
|
|
|
|
err_deinit_pencrypt:
|
|
pcrypt_fini_padata(&pencrypt);
|
|
err_unreg_kset:
|
|
kset_unregister(pcrypt_kset);
|
|
err:
|
|
return err;
|
|
}
|
|
|
|
static void __exit pcrypt_exit(void)
|
|
{
|
|
pcrypt_fini_padata(&pencrypt);
|
|
pcrypt_fini_padata(&pdecrypt);
|
|
|
|
kset_unregister(pcrypt_kset);
|
|
crypto_unregister_template(&pcrypt_tmpl);
|
|
}
|
|
|
|
module_init(pcrypt_init);
|
|
module_exit(pcrypt_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
|
|
MODULE_DESCRIPTION("Parallel crypto wrapper");
|
|
MODULE_ALIAS_CRYPTO("pcrypt");
|