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![Ard Biesheuvel](/assets/img/avatar_default.png)
The simd wrapper's skcipher request context structure consists of a single subrequest whose size is taken from the subordinate skcipher. However, in simd_skcipher_init(), the reqsize that is retrieved is not from the subordinate skcipher but from the cryptd request structure, whose size is completely unrelated to the actual wrapped skcipher. Reported-by: Qian Cai <cai@gmx.us> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Qian Cai <cai@gmx.us> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
275 lines
7.3 KiB
C
275 lines
7.3 KiB
C
/*
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* Shared crypto simd helpers
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*
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* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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* Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* Based on aesni-intel_glue.c by:
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* Copyright (C) 2008, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <crypto/cryptd.h>
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#include <crypto/internal/simd.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/preempt.h>
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#include <asm/simd.h>
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struct simd_skcipher_alg {
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const char *ialg_name;
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struct skcipher_alg alg;
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};
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struct simd_skcipher_ctx {
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struct cryptd_skcipher *cryptd_tfm;
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};
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static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
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int err;
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crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(child, key, key_len);
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crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static int simd_skcipher_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_request *subreq;
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struct crypto_skcipher *child;
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subreq = skcipher_request_ctx(req);
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*subreq = *req;
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if (!may_use_simd() ||
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(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
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child = &ctx->cryptd_tfm->base;
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else
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child = cryptd_skcipher_child(ctx->cryptd_tfm);
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skcipher_request_set_tfm(subreq, child);
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return crypto_skcipher_encrypt(subreq);
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}
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static int simd_skcipher_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_request *subreq;
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struct crypto_skcipher *child;
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subreq = skcipher_request_ctx(req);
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*subreq = *req;
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if (!may_use_simd() ||
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(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
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child = &ctx->cryptd_tfm->base;
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else
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child = cryptd_skcipher_child(ctx->cryptd_tfm);
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skcipher_request_set_tfm(subreq, child);
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return crypto_skcipher_decrypt(subreq);
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}
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static void simd_skcipher_exit(struct crypto_skcipher *tfm)
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{
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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cryptd_free_skcipher(ctx->cryptd_tfm);
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}
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static int simd_skcipher_init(struct crypto_skcipher *tfm)
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{
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct cryptd_skcipher *cryptd_tfm;
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struct simd_skcipher_alg *salg;
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struct skcipher_alg *alg;
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unsigned reqsize;
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alg = crypto_skcipher_alg(tfm);
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salg = container_of(alg, struct simd_skcipher_alg, alg);
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cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
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CRYPTO_ALG_INTERNAL,
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CRYPTO_ALG_INTERNAL);
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if (IS_ERR(cryptd_tfm))
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return PTR_ERR(cryptd_tfm);
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ctx->cryptd_tfm = cryptd_tfm;
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reqsize = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm));
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reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base));
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reqsize += sizeof(struct skcipher_request);
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crypto_skcipher_set_reqsize(tfm, reqsize);
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return 0;
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}
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struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
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const char *drvname,
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const char *basename)
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{
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struct simd_skcipher_alg *salg;
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struct crypto_skcipher *tfm;
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struct skcipher_alg *ialg;
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struct skcipher_alg *alg;
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int err;
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tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
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CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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return ERR_CAST(tfm);
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ialg = crypto_skcipher_alg(tfm);
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salg = kzalloc(sizeof(*salg), GFP_KERNEL);
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if (!salg) {
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salg = ERR_PTR(-ENOMEM);
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goto out_put_tfm;
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}
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salg->ialg_name = basename;
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alg = &salg->alg;
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err = -ENAMETOOLONG;
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if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
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CRYPTO_MAX_ALG_NAME)
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goto out_free_salg;
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if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
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drvname) >= CRYPTO_MAX_ALG_NAME)
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goto out_free_salg;
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alg->base.cra_flags = CRYPTO_ALG_ASYNC;
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alg->base.cra_priority = ialg->base.cra_priority;
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alg->base.cra_blocksize = ialg->base.cra_blocksize;
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alg->base.cra_alignmask = ialg->base.cra_alignmask;
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alg->base.cra_module = ialg->base.cra_module;
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alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
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alg->ivsize = ialg->ivsize;
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alg->chunksize = ialg->chunksize;
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alg->min_keysize = ialg->min_keysize;
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alg->max_keysize = ialg->max_keysize;
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alg->init = simd_skcipher_init;
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alg->exit = simd_skcipher_exit;
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alg->setkey = simd_skcipher_setkey;
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alg->encrypt = simd_skcipher_encrypt;
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alg->decrypt = simd_skcipher_decrypt;
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err = crypto_register_skcipher(alg);
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if (err)
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goto out_free_salg;
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out_put_tfm:
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crypto_free_skcipher(tfm);
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return salg;
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out_free_salg:
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kfree(salg);
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salg = ERR_PTR(err);
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goto out_put_tfm;
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}
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EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
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struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
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const char *basename)
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{
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char drvname[CRYPTO_MAX_ALG_NAME];
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if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
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CRYPTO_MAX_ALG_NAME)
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return ERR_PTR(-ENAMETOOLONG);
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return simd_skcipher_create_compat(algname, drvname, basename);
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}
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EXPORT_SYMBOL_GPL(simd_skcipher_create);
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void simd_skcipher_free(struct simd_skcipher_alg *salg)
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{
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crypto_unregister_skcipher(&salg->alg);
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kfree(salg);
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}
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EXPORT_SYMBOL_GPL(simd_skcipher_free);
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int simd_register_skciphers_compat(struct skcipher_alg *algs, int count,
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struct simd_skcipher_alg **simd_algs)
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{
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int err;
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int i;
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const char *algname;
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const char *drvname;
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const char *basename;
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struct simd_skcipher_alg *simd;
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err = crypto_register_skciphers(algs, count);
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if (err)
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return err;
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for (i = 0; i < count; i++) {
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WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
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WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
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algname = algs[i].base.cra_name + 2;
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drvname = algs[i].base.cra_driver_name + 2;
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basename = algs[i].base.cra_driver_name;
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simd = simd_skcipher_create_compat(algname, drvname, basename);
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err = PTR_ERR(simd);
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if (IS_ERR(simd))
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goto err_unregister;
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simd_algs[i] = simd;
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}
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return 0;
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err_unregister:
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simd_unregister_skciphers(algs, count, simd_algs);
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return err;
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}
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EXPORT_SYMBOL_GPL(simd_register_skciphers_compat);
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void simd_unregister_skciphers(struct skcipher_alg *algs, int count,
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struct simd_skcipher_alg **simd_algs)
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{
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int i;
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crypto_unregister_skciphers(algs, count);
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for (i = 0; i < count; i++) {
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if (simd_algs[i]) {
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simd_skcipher_free(simd_algs[i]);
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simd_algs[i] = NULL;
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}
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}
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}
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EXPORT_SYMBOL_GPL(simd_unregister_skciphers);
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MODULE_LICENSE("GPL");
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