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linux/crypto/simd.c
Herbert Xu 3c44d31cb3 crypto: simd - Do not call crypto_alloc_tfm during registration 
Algorithm registration is usually carried out during module init,
where as little work as possible should be carried out.  The SIMD
code violated this rule by allocating a tfm, this then triggers a
full test of the algorithm which may dead-lock in certain cases.

SIMD is only allocating the tfm to get at the alg object, which is
in fact already available as it is what we are registering.  Use
that directly and remove the crypto_alloc_tfm call.

Also remove some obsolete and unused SIMD API.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2024-08-24 21:39:15 +08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Shared crypto simd helpers
*
* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
* Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
* Copyright (c) 2019 Google LLC
*
* Based on aesni-intel_glue.c by:
* Copyright (C) 2008, Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*/
/*
* Shared crypto SIMD helpers. These functions dynamically create and register
* an skcipher or AEAD algorithm that wraps another, internal algorithm. The
* wrapper ensures that the internal algorithm is only executed in a context
* where SIMD instructions are usable, i.e. where may_use_simd() returns true.
* If SIMD is already usable, the wrapper directly calls the internal algorithm.
* Otherwise it defers execution to a workqueue via cryptd.
*
* This is an alternative to the internal algorithm implementing a fallback for
* the !may_use_simd() case itself.
*
* Note that the wrapper algorithm is asynchronous, i.e. it has the
* CRYPTO_ALG_ASYNC flag set. Therefore it won't be found by users who
* explicitly allocate a synchronous algorithm.
*/
#include <crypto/cryptd.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/preempt.h>
#include <asm/simd.h>
/* skcipher support */
struct simd_skcipher_alg {
const char *ialg_name;
struct skcipher_alg alg;
};
struct simd_skcipher_ctx {
struct cryptd_skcipher *cryptd_tfm;
};
static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_MASK);
return crypto_skcipher_setkey(child, key, key_len);
}
static int simd_skcipher_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_request *subreq;
struct crypto_skcipher *child;
subreq = skcipher_request_ctx(req);
*subreq = *req;
if (!crypto_simd_usable() ||
(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
child = &ctx->cryptd_tfm->base;
else
child = cryptd_skcipher_child(ctx->cryptd_tfm);
skcipher_request_set_tfm(subreq, child);
return crypto_skcipher_encrypt(subreq);
}
static int simd_skcipher_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_request *subreq;
struct crypto_skcipher *child;
subreq = skcipher_request_ctx(req);
*subreq = *req;
if (!crypto_simd_usable() ||
(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
child = &ctx->cryptd_tfm->base;
else
child = cryptd_skcipher_child(ctx->cryptd_tfm);
skcipher_request_set_tfm(subreq, child);
return crypto_skcipher_decrypt(subreq);
}
static void simd_skcipher_exit(struct crypto_skcipher *tfm)
{
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
cryptd_free_skcipher(ctx->cryptd_tfm);
}
static int simd_skcipher_init(struct crypto_skcipher *tfm)
{
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct cryptd_skcipher *cryptd_tfm;
struct simd_skcipher_alg *salg;
struct skcipher_alg *alg;
unsigned reqsize;
alg = crypto_skcipher_alg(tfm);
salg = container_of(alg, struct simd_skcipher_alg, alg);
cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
CRYPTO_ALG_INTERNAL,
CRYPTO_ALG_INTERNAL);
if (IS_ERR(cryptd_tfm))
return PTR_ERR(cryptd_tfm);
ctx->cryptd_tfm = cryptd_tfm;
reqsize = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm));
reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base));
reqsize += sizeof(struct skcipher_request);
crypto_skcipher_set_reqsize(tfm, reqsize);
return 0;
}
struct simd_skcipher_alg *simd_skcipher_create_compat(struct skcipher_alg *ialg,
const char *algname,
const char *drvname,
const char *basename)
{
struct simd_skcipher_alg *salg;
struct skcipher_alg *alg;
int err;
salg = kzalloc(sizeof(*salg), GFP_KERNEL);
if (!salg) {
salg = ERR_PTR(-ENOMEM);
goto out;
}
salg->ialg_name = basename;
alg = &salg->alg;
err = -ENAMETOOLONG;
if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
CRYPTO_MAX_ALG_NAME)
goto out_free_salg;
if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
drvname) >= CRYPTO_MAX_ALG_NAME)
goto out_free_salg;
alg->base.cra_flags = CRYPTO_ALG_ASYNC |
(ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
alg->base.cra_priority = ialg->base.cra_priority;
alg->base.cra_blocksize = ialg->base.cra_blocksize;
alg->base.cra_alignmask = ialg->base.cra_alignmask;
alg->base.cra_module = ialg->base.cra_module;
alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
alg->ivsize = ialg->ivsize;
alg->chunksize = ialg->chunksize;
alg->min_keysize = ialg->min_keysize;
alg->max_keysize = ialg->max_keysize;
alg->init = simd_skcipher_init;
alg->exit = simd_skcipher_exit;
alg->setkey = simd_skcipher_setkey;
alg->encrypt = simd_skcipher_encrypt;
alg->decrypt = simd_skcipher_decrypt;
err = crypto_register_skcipher(alg);
if (err)
goto out_free_salg;
out:
return salg;
out_free_salg:
kfree(salg);
salg = ERR_PTR(err);
goto out;
}
EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
void simd_skcipher_free(struct simd_skcipher_alg *salg)
{
crypto_unregister_skcipher(&salg->alg);
kfree(salg);
}
EXPORT_SYMBOL_GPL(simd_skcipher_free);
int simd_register_skciphers_compat(struct skcipher_alg *algs, int count,
struct simd_skcipher_alg **simd_algs)
{
int err;
int i;
const char *algname;
const char *drvname;
const char *basename;
struct simd_skcipher_alg *simd;
err = crypto_register_skciphers(algs, count);
if (err)
return err;
for (i = 0; i < count; i++) {
WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
algname = algs[i].base.cra_name + 2;
drvname = algs[i].base.cra_driver_name + 2;
basename = algs[i].base.cra_driver_name;
simd = simd_skcipher_create_compat(algs + i, algname, drvname, basename);
err = PTR_ERR(simd);
if (IS_ERR(simd))
goto err_unregister;
simd_algs[i] = simd;
}
return 0;
err_unregister:
simd_unregister_skciphers(algs, count, simd_algs);
return err;
}
EXPORT_SYMBOL_GPL(simd_register_skciphers_compat);
void simd_unregister_skciphers(struct skcipher_alg *algs, int count,
struct simd_skcipher_alg **simd_algs)
{
int i;
crypto_unregister_skciphers(algs, count);
for (i = 0; i < count; i++) {
if (simd_algs[i]) {
simd_skcipher_free(simd_algs[i]);
simd_algs[i] = NULL;
}
}
}
EXPORT_SYMBOL_GPL(simd_unregister_skciphers);
/* AEAD support */
struct simd_aead_alg {
const char *ialg_name;
struct aead_alg alg;
};
struct simd_aead_ctx {
struct cryptd_aead *cryptd_tfm;
};
static int simd_aead_setkey(struct crypto_aead *tfm, const u8 *key,
unsigned int key_len)
{
struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_aead *child = &ctx->cryptd_tfm->base;
crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_aead_set_flags(child, crypto_aead_get_flags(tfm) &
CRYPTO_TFM_REQ_MASK);
return crypto_aead_setkey(child, key, key_len);
}
static int simd_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_aead *child = &ctx->cryptd_tfm->base;
return crypto_aead_setauthsize(child, authsize);
}
static int simd_aead_encrypt(struct aead_request *req)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
struct aead_request *subreq;
struct crypto_aead *child;
subreq = aead_request_ctx(req);
*subreq = *req;
if (!crypto_simd_usable() ||
(in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))
child = &ctx->cryptd_tfm->base;
else
child = cryptd_aead_child(ctx->cryptd_tfm);
aead_request_set_tfm(subreq, child);
return crypto_aead_encrypt(subreq);
}
static int simd_aead_decrypt(struct aead_request *req)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
struct aead_request *subreq;
struct crypto_aead *child;
subreq = aead_request_ctx(req);
*subreq = *req;
if (!crypto_simd_usable() ||
(in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))
child = &ctx->cryptd_tfm->base;
else
child = cryptd_aead_child(ctx->cryptd_tfm);
aead_request_set_tfm(subreq, child);
return crypto_aead_decrypt(subreq);
}
static void simd_aead_exit(struct crypto_aead *tfm)
{
struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
cryptd_free_aead(ctx->cryptd_tfm);
}
static int simd_aead_init(struct crypto_aead *tfm)
{
struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
struct cryptd_aead *cryptd_tfm;
struct simd_aead_alg *salg;
struct aead_alg *alg;
unsigned reqsize;
alg = crypto_aead_alg(tfm);
salg = container_of(alg, struct simd_aead_alg, alg);
cryptd_tfm = cryptd_alloc_aead(salg->ialg_name, CRYPTO_ALG_INTERNAL,
CRYPTO_ALG_INTERNAL);
if (IS_ERR(cryptd_tfm))
return PTR_ERR(cryptd_tfm);
ctx->cryptd_tfm = cryptd_tfm;
reqsize = crypto_aead_reqsize(cryptd_aead_child(cryptd_tfm));
reqsize = max(reqsize, crypto_aead_reqsize(&cryptd_tfm->base));
reqsize += sizeof(struct aead_request);
crypto_aead_set_reqsize(tfm, reqsize);
return 0;
}
static struct simd_aead_alg *simd_aead_create_compat(struct aead_alg *ialg,
const char *algname,
const char *drvname,
const char *basename)
{
struct simd_aead_alg *salg;
struct aead_alg *alg;
int err;
salg = kzalloc(sizeof(*salg), GFP_KERNEL);
if (!salg) {
salg = ERR_PTR(-ENOMEM);
goto out;
}
salg->ialg_name = basename;
alg = &salg->alg;
err = -ENAMETOOLONG;
if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
CRYPTO_MAX_ALG_NAME)
goto out_free_salg;
if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
drvname) >= CRYPTO_MAX_ALG_NAME)
goto out_free_salg;
alg->base.cra_flags = CRYPTO_ALG_ASYNC |
(ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
alg->base.cra_priority = ialg->base.cra_priority;
alg->base.cra_blocksize = ialg->base.cra_blocksize;
alg->base.cra_alignmask = ialg->base.cra_alignmask;
alg->base.cra_module = ialg->base.cra_module;
alg->base.cra_ctxsize = sizeof(struct simd_aead_ctx);
alg->ivsize = ialg->ivsize;
alg->maxauthsize = ialg->maxauthsize;
alg->chunksize = ialg->chunksize;
alg->init = simd_aead_init;
alg->exit = simd_aead_exit;
alg->setkey = simd_aead_setkey;
alg->setauthsize = simd_aead_setauthsize;
alg->encrypt = simd_aead_encrypt;
alg->decrypt = simd_aead_decrypt;
err = crypto_register_aead(alg);
if (err)
goto out_free_salg;
out:
return salg;
out_free_salg:
kfree(salg);
salg = ERR_PTR(err);
goto out;
}
static void simd_aead_free(struct simd_aead_alg *salg)
{
crypto_unregister_aead(&salg->alg);
kfree(salg);
}
int simd_register_aeads_compat(struct aead_alg *algs, int count,
struct simd_aead_alg **simd_algs)
{
int err;
int i;
const char *algname;
const char *drvname;
const char *basename;
struct simd_aead_alg *simd;
err = crypto_register_aeads(algs, count);
if (err)
return err;
for (i = 0; i < count; i++) {
WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
algname = algs[i].base.cra_name + 2;
drvname = algs[i].base.cra_driver_name + 2;
basename = algs[i].base.cra_driver_name;
simd = simd_aead_create_compat(algs + i, algname, drvname, basename);
err = PTR_ERR(simd);
if (IS_ERR(simd))
goto err_unregister;
simd_algs[i] = simd;
}
return 0;
err_unregister:
simd_unregister_aeads(algs, count, simd_algs);
return err;
}
EXPORT_SYMBOL_GPL(simd_register_aeads_compat);
void simd_unregister_aeads(struct aead_alg *algs, int count,
struct simd_aead_alg **simd_algs)
{
int i;
crypto_unregister_aeads(algs, count);
for (i = 0; i < count; i++) {
if (simd_algs[i]) {
simd_aead_free(simd_algs[i]);
simd_algs[i] = NULL;
}
}
}
EXPORT_SYMBOL_GPL(simd_unregister_aeads);
MODULE_DESCRIPTION("Shared crypto SIMD helpers");
MODULE_LICENSE("GPL");
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