forked from mirrors/linux
486bfb0591
As signature verification has a NULL destination buffer, the pointer
needs to be checked before the memcpy is done.
Fixes: addde1f2c9 ("crypto: akcipher - Add sync interface without SG lists")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
312 lines
8 KiB
C
312 lines
8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Public Key Encryption
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*
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* Copyright (c) 2015, Intel Corporation
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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*/
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#include <crypto/internal/akcipher.h>
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#include <linux/cryptouser.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include "internal.h"
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#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
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static int __maybe_unused crypto_akcipher_report(
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struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_akcipher rakcipher;
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memset(&rakcipher, 0, sizeof(rakcipher));
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strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
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return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
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sizeof(rakcipher), &rakcipher);
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}
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static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
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__maybe_unused;
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static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_puts(m, "type : akcipher\n");
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}
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static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
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struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
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alg->exit(akcipher);
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}
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static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
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struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
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if (alg->exit)
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akcipher->base.exit = crypto_akcipher_exit_tfm;
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if (alg->init)
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return alg->init(akcipher);
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return 0;
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}
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static void crypto_akcipher_free_instance(struct crypto_instance *inst)
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{
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struct akcipher_instance *akcipher = akcipher_instance(inst);
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akcipher->free(akcipher);
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}
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static int __maybe_unused crypto_akcipher_report_stat(
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struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct akcipher_alg *akcipher = __crypto_akcipher_alg(alg);
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struct crypto_istat_akcipher *istat;
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struct crypto_stat_akcipher rakcipher;
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istat = akcipher_get_stat(akcipher);
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memset(&rakcipher, 0, sizeof(rakcipher));
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strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
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rakcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt);
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rakcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen);
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rakcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt);
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rakcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen);
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rakcipher.stat_sign_cnt = atomic64_read(&istat->sign_cnt);
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rakcipher.stat_verify_cnt = atomic64_read(&istat->verify_cnt);
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rakcipher.stat_err_cnt = atomic64_read(&istat->err_cnt);
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return nla_put(skb, CRYPTOCFGA_STAT_AKCIPHER,
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sizeof(rakcipher), &rakcipher);
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}
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static const struct crypto_type crypto_akcipher_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_akcipher_init_tfm,
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.free = crypto_akcipher_free_instance,
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#ifdef CONFIG_PROC_FS
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.show = crypto_akcipher_show,
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#endif
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#if IS_ENABLED(CONFIG_CRYPTO_USER)
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.report = crypto_akcipher_report,
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#endif
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#ifdef CONFIG_CRYPTO_STATS
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.report_stat = crypto_akcipher_report_stat,
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#endif
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
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.type = CRYPTO_ALG_TYPE_AKCIPHER,
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.tfmsize = offsetof(struct crypto_akcipher, base),
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};
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int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,
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struct crypto_instance *inst,
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const char *name, u32 type, u32 mask)
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{
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spawn->base.frontend = &crypto_akcipher_type;
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return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
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struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
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u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
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static void akcipher_prepare_alg(struct akcipher_alg *alg)
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{
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struct crypto_istat_akcipher *istat = akcipher_get_stat(alg);
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struct crypto_alg *base = &alg->base;
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base->cra_type = &crypto_akcipher_type;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
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if (IS_ENABLED(CONFIG_CRYPTO_STATS))
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memset(istat, 0, sizeof(*istat));
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}
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static int akcipher_default_op(struct akcipher_request *req)
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{
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return -ENOSYS;
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}
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static int akcipher_default_set_key(struct crypto_akcipher *tfm,
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const void *key, unsigned int keylen)
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{
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return -ENOSYS;
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}
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int crypto_register_akcipher(struct akcipher_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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if (!alg->sign)
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alg->sign = akcipher_default_op;
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if (!alg->verify)
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alg->verify = akcipher_default_op;
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if (!alg->encrypt)
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alg->encrypt = akcipher_default_op;
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if (!alg->decrypt)
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alg->decrypt = akcipher_default_op;
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if (!alg->set_priv_key)
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alg->set_priv_key = akcipher_default_set_key;
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akcipher_prepare_alg(alg);
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return crypto_register_alg(base);
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}
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EXPORT_SYMBOL_GPL(crypto_register_akcipher);
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void crypto_unregister_akcipher(struct akcipher_alg *alg)
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{
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crypto_unregister_alg(&alg->base);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
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int akcipher_register_instance(struct crypto_template *tmpl,
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struct akcipher_instance *inst)
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{
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if (WARN_ON(!inst->free))
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return -EINVAL;
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akcipher_prepare_alg(&inst->alg);
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return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
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}
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EXPORT_SYMBOL_GPL(akcipher_register_instance);
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int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
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{
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unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);
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struct akcipher_request *req;
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struct scatterlist *sg;
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unsigned int mlen;
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unsigned int len;
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u8 *buf;
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if (data->dst)
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mlen = max(data->slen, data->dlen);
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else
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mlen = data->slen + data->dlen;
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len = sizeof(*req) + reqsize + mlen;
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if (len < mlen)
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return -EOVERFLOW;
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req = kzalloc(len, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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data->req = req;
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akcipher_request_set_tfm(req, data->tfm);
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buf = (u8 *)(req + 1) + reqsize;
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data->buf = buf;
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memcpy(buf, data->src, data->slen);
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sg = &data->sg;
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sg_init_one(sg, buf, mlen);
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akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL,
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data->slen, data->dlen);
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crypto_init_wait(&data->cwait);
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akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
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crypto_req_done, &data->cwait);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep);
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int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err)
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{
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err = crypto_wait_req(err, &data->cwait);
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if (data->dst)
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memcpy(data->dst, data->buf, data->dlen);
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data->dlen = data->req->dst_len;
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kfree_sensitive(data->req);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post);
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int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm,
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const void *src, unsigned int slen,
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void *dst, unsigned int dlen)
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{
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struct crypto_akcipher_sync_data data = {
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.tfm = tfm,
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.src = src,
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.dst = dst,
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.slen = slen,
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.dlen = dlen,
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};
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return crypto_akcipher_sync_prep(&data) ?:
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crypto_akcipher_sync_post(&data,
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crypto_akcipher_encrypt(data.req));
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}
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EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt);
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int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm,
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const void *src, unsigned int slen,
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void *dst, unsigned int dlen)
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{
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struct crypto_akcipher_sync_data data = {
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.tfm = tfm,
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.src = src,
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.dst = dst,
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.slen = slen,
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.dlen = dlen,
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};
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return crypto_akcipher_sync_prep(&data) ?:
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crypto_akcipher_sync_post(&data,
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crypto_akcipher_decrypt(data.req)) ?:
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data.dlen;
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}
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EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt);
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static void crypto_exit_akcipher_ops_sig(struct crypto_tfm *tfm)
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{
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struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);
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crypto_free_akcipher(*ctx);
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}
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int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm)
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{
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struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);
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struct crypto_alg *calg = tfm->__crt_alg;
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struct crypto_akcipher *akcipher;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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akcipher = crypto_create_tfm(calg, &crypto_akcipher_type);
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if (IS_ERR(akcipher)) {
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crypto_mod_put(calg);
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return PTR_ERR(akcipher);
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}
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*ctx = akcipher;
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tfm->exit = crypto_exit_akcipher_ops_sig;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_sig);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Generic public key cipher type");
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