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crypto: skcipher - pass instance to crypto_grab_skcipher() 

Initializing a crypto_skcipher_spawn currently requires:

1. Set spawn->base.inst to point to the instance.
2. Call crypto_grab_skcipher().

But there's no reason for these steps to be separate, and in fact this
unneeded complication has caused at least one bug, the one fixed by
commit 6db4341017 ("crypto: adiantum - initialize crypto_spawn::inst")

So just make crypto_grab_skcipher() take the instance as an argument.

To keep the function calls from getting too unwieldy due to this extra
argument, also introduce a 'mask' variable into the affected places
which weren't already using one.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2020-01-02 19:58:45 -08:00 committed by Herbert Xu
parent 77f7e94d72
commit b9f76dddb1
14 changed files with 68 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
crypto/adiantum.c
View File

@ -493,6 +493,7 @@ static bool adiantum_supported_algorithms(struct skcipher_alg *streamcipher_alg,
static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_attr_type *algt;
u32 mask;
const char *streamcipher_name;
const char *blockcipher_name;
const char *nhpoly1305_name;
@ -511,6 +512,8 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
streamcipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(streamcipher_name))
return PTR_ERR(streamcipher_name);
@ -531,11 +534,9 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
ictx = skcipher_instance_ctx(inst);
/* Stream cipher, e.g. "xchacha12" */
crypto_set_skcipher_spawn(&ictx->streamcipher_spawn,
skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(&ictx->streamcipher_spawn, streamcipher_name,
0, crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ictx->streamcipher_spawn,
skcipher_crypto_instance(inst),
streamcipher_name, 0, mask);
if (err)
goto out_free_inst;
streamcipher_alg = crypto_spawn_skcipher_alg(&ictx->streamcipher_spawn);

12
crypto/authenc.c
View File

@ -373,6 +373,7 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
struct rtattr **tb)
{
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct hash_alg_common *auth;
struct crypto_alg *auth_base;
@ -388,9 +389,10 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
crypto_requires_sync(algt->type, algt->mask));
CRYPTO_ALG_TYPE_AHASH_MASK | mask);
if (IS_ERR(auth))
return PTR_ERR(auth);
@ -413,10 +415,8 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
if (err)
goto err_free_inst;
crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
enc_name, 0, mask);
if (err)
goto err_drop_auth;

12
crypto/authencesn.c
View File

@ -391,6 +391,7 @@ static int crypto_authenc_esn_create(struct crypto_template *tmpl,
struct rtattr **tb)
{
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct hash_alg_common *auth;
struct crypto_alg *auth_base;
@ -406,9 +407,10 @@ static int crypto_authenc_esn_create(struct crypto_template *tmpl,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
crypto_requires_sync(algt->type, algt->mask));
CRYPTO_ALG_TYPE_AHASH_MASK | mask);
if (IS_ERR(auth))
return PTR_ERR(auth);
@ -431,10 +433,8 @@ static int crypto_authenc_esn_create(struct crypto_template *tmpl,
if (err)
goto err_free_inst;
crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
enc_name, 0, mask);
if (err)
goto err_drop_auth;

9
crypto/ccm.c
View File

@ -450,6 +450,7 @@ static int crypto_ccm_create_common(struct crypto_template *tmpl,
const char *mac_name)
{
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct skcipher_alg *ctr;
struct crypto_alg *mac_alg;
@ -464,6 +465,8 @@ static int crypto_ccm_create_common(struct crypto_template *tmpl,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type,
CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
@ -488,10 +491,8 @@ static int crypto_ccm_create_common(struct crypto_template *tmpl,
if (err)
goto err_free_inst;
crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst),
ctr_name, 0, mask);
if (err)
goto err_drop_mac;

13
crypto/chacha20poly1305.c
View File

@ -558,6 +558,7 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
const char *name, unsigned int ivsize)
{
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct skcipher_alg *chacha;
struct crypto_alg *poly;
@ -576,6 +577,8 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
chacha_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(chacha_name))
return PTR_ERR(chacha_name);
@ -585,9 +588,7 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
poly = crypto_find_alg(poly_name, &crypto_ahash_type,
CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
crypto_requires_sync(algt->type,
algt->mask));
CRYPTO_ALG_TYPE_AHASH_MASK | mask);
if (IS_ERR(poly))
return PTR_ERR(poly);
poly_hash = __crypto_hash_alg_common(poly);
@ -608,10 +609,8 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
if (err)
goto err_free_inst;
crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ctx->chacha, aead_crypto_instance(inst),
chacha_name, 0, mask);
if (err)
goto err_drop_poly;

4
crypto/cryptd.c
View File

@ -416,8 +416,8 @@ static int cryptd_create_skcipher(struct crypto_template *tmpl,
ctx = skcipher_instance_ctx(inst);
ctx->queue = queue;
crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->spawn, name, type, mask);
err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst),
name, type, mask);
if (err)
goto out_free_inst;

4
crypto/ctr.c
View File

@ -286,8 +286,8 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl,
spawn = skcipher_instance_ctx(inst);
crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(spawn, cipher_name, 0, mask);
err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
cipher_name, 0, mask);
if (err)
goto err_free_inst;

9
crypto/cts.c
View File

@ -328,6 +328,7 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
struct crypto_attr_type *algt;
struct skcipher_alg *alg;
const char *cipher_name;
u32 mask;
int err;
algt = crypto_get_attr_type(tb);
@ -337,6 +338,8 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name))
return PTR_ERR(cipher_name);
@ -347,10 +350,8 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
spawn = skcipher_instance_ctx(inst);
crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(spawn, cipher_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
cipher_name, 0, mask);
if (err)
goto err_free_inst;

13
crypto/essiv.c
View File

@ -452,6 +452,7 @@ static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
struct shash_alg *hash_alg;
int ivsize;
u32 type;
u32 mask;
int err;
algt = crypto_get_attr_type(tb);
@ -467,6 +468,7 @@ static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
return PTR_ERR(shash_name);
type = algt->type & algt->mask;
mask = crypto_requires_sync(algt->type, algt->mask);
switch (type) {
case CRYPTO_ALG_TYPE_SKCIPHER:
@ -479,11 +481,8 @@ static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
ictx = crypto_instance_ctx(inst);
/* Symmetric cipher, e.g., "cbc(aes)" */
crypto_set_skcipher_spawn(&ictx->u.skcipher_spawn, inst);
err = crypto_grab_skcipher(&ictx->u.skcipher_spawn,
inner_cipher_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ictx->u.skcipher_spawn, inst,
inner_cipher_name, 0, mask);
if (err)
goto out_free_inst;
skcipher_alg = crypto_spawn_skcipher_alg(&ictx->u.skcipher_spawn);
@ -503,9 +502,7 @@ static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
/* AEAD cipher, e.g., "authenc(hmac(sha256),cbc(aes))" */
crypto_set_aead_spawn(&ictx->u.aead_spawn, inst);
err = crypto_grab_aead(&ictx->u.aead_spawn,
inner_cipher_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
inner_cipher_name, 0, mask);
if (err)
goto out_free_inst;
aead_alg = crypto_spawn_aead_alg(&ictx->u.aead_spawn);

13
crypto/gcm.c
View File

@ -580,6 +580,7 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
const char *ghash_name)
{
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct skcipher_alg *ctr;
struct crypto_alg *ghash_alg;
@ -594,11 +595,11 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
crypto_requires_sync(algt->type,
algt->mask));
CRYPTO_ALG_TYPE_AHASH_MASK | mask);
if (IS_ERR(ghash_alg))
return PTR_ERR(ghash_alg);
@ -620,10 +621,8 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
ghash->digestsize != 16)
goto err_drop_ghash;
crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
ctr_name, 0, mask);
if (err)
goto err_drop_ghash;

15
crypto/lrw.c
View File

@ -301,6 +301,7 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
struct skcipher_alg *alg;
const char *cipher_name;
char ecb_name[CRYPTO_MAX_ALG_NAME];
u32 mask;
int err;
algt = crypto_get_attr_type(tb);
@ -310,6 +311,8 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name))
return PTR_ERR(cipher_name);
@ -320,19 +323,17 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
spawn = skcipher_instance_ctx(inst);
crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(spawn, cipher_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
cipher_name, 0, mask);
if (err == -ENOENT) {
err = -ENAMETOOLONG;
if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
cipher_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
err = crypto_grab_skcipher(spawn, ecb_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(spawn,
skcipher_crypto_instance(inst),
ecb_name, 0, mask);
}
if (err)

4
crypto/skcipher.c
View File

@ -747,8 +747,10 @@ static const struct crypto_type crypto_skcipher_type = {
};
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
const char *name, u32 type, u32 mask)
struct crypto_instance *inst,
const char *name, u32 type, u32 mask)
{
spawn->base.inst = inst;
spawn->base.frontend = &crypto_skcipher_type;
return crypto_grab_spawn(&spawn->base, name, type, mask);
}

9
crypto/xts.c
View File

@ -355,20 +355,21 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
ctx = skcipher_instance_ctx(inst);
crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst));
mask = crypto_requires_off(algt->type, algt->mask,
CRYPTO_ALG_NEED_FALLBACK |
CRYPTO_ALG_ASYNC);
err = crypto_grab_skcipher(&ctx->spawn, cipher_name, 0, mask);
err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst),
cipher_name, 0, mask);
if (err == -ENOENT) {
err = -ENAMETOOLONG;
if (snprintf(ctx->name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
cipher_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
err = crypto_grab_skcipher(&ctx->spawn, ctx->name, 0, mask);
err = crypto_grab_skcipher(&ctx->spawn,
skcipher_crypto_instance(inst),
ctx->name, 0, mask);
}
if (err)

11
include/crypto/internal/skcipher.h
View File

@ -88,14 +88,9 @@ static inline void skcipher_request_complete(struct skcipher_request *req, int e
req->base.complete(&req->base, err);
}
static inline void crypto_set_skcipher_spawn(
struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
{
crypto_set_spawn(&spawn->base, inst);
}
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask);
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
struct crypto_instance *inst,
const char *name, u32 type, u32 mask);
static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
{