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crypto: null - Remove VLA usage of skcipher

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In the quest to remove all stack VLA usage from the kernel[1], this
replaces struct crypto_skcipher and SKCIPHER_REQUEST_ON_STACK() usage
with struct crypto_sync_skcipher and SYNC_SKCIPHER_REQUEST_ON_STACK(),
which uses a fixed stack size.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: azrim <mirzaspc@gmail.com>
This commit is contained in:
Kees Cook 2018-09-18 19:10:51 -07:00 committed by azrim
parent a542370849
commit e8cd3c0b36
No known key found for this signature in database
GPG Key ID: 497F8FB059B45D1C
8 changed files with 23 additions and 24 deletions
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8
crypto/authenc.c
View File

@ -33,7 +33,7 @@ struct authenc_instance_ctx {
struct crypto_authenc_ctx {
struct crypto_ahash *auth;
struct crypto_skcipher *enc;
struct crypto_skcipher *null;
struct crypto_sync_skcipher *null;
};
struct authenc_request_ctx {
@ -193,9 +193,9 @@ static int crypto_authenc_copy_assoc(struct aead_request *req)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
skcipher_request_set_tfm(skreq, ctx->null);
skcipher_request_set_sync_tfm(skreq, ctx->null);
skcipher_request_set_callback(skreq, aead_request_flags(req),
NULL, NULL);
skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,
@ -326,7 +326,7 @@ static int crypto_authenc_init_tfm(struct crypto_aead *tfm)
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_ahash *auth;
struct crypto_skcipher *enc;
struct crypto_skcipher *null;
struct crypto_sync_skcipher *null;
int err;
auth = crypto_spawn_ahash(&ictx->auth);

8
crypto/authencesn.c
View File

@ -36,7 +36,7 @@ struct crypto_authenc_esn_ctx {
unsigned int reqoff;
struct crypto_ahash *auth;
struct crypto_skcipher *enc;
struct crypto_skcipher *null;
struct crypto_sync_skcipher *null;
};
struct authenc_esn_request_ctx {
@ -183,9 +183,9 @@ static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
{
struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
skcipher_request_set_tfm(skreq, ctx->null);
skcipher_request_set_sync_tfm(skreq, ctx->null);
skcipher_request_set_callback(skreq, aead_request_flags(req),
NULL, NULL);
skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
@ -341,7 +341,7 @@ static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_ahash *auth;
struct crypto_skcipher *enc;
struct crypto_skcipher *null;
struct crypto_sync_skcipher *null;
int err;
auth = crypto_spawn_ahash(&ictx->auth);

11
crypto/crypto_null.c
View File

@ -26,7 +26,7 @@
#include <linux/string.h>
static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
static struct crypto_skcipher *crypto_default_null_skcipher;
static struct crypto_sync_skcipher *crypto_default_null_skcipher;
static int crypto_default_null_skcipher_refcnt;
static int null_compress(struct crypto_tfm *tfm, const u8 *src,
@ -153,16 +153,15 @@ MODULE_ALIAS_CRYPTO("compress_null");
MODULE_ALIAS_CRYPTO("digest_null");
MODULE_ALIAS_CRYPTO("cipher_null");
struct crypto_skcipher *crypto_get_default_null_skcipher(void)
struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void)
{
struct crypto_skcipher *tfm;
struct crypto_sync_skcipher *tfm;
mutex_lock(&crypto_default_null_skcipher_lock);
tfm = crypto_default_null_skcipher;
if (!tfm) {
tfm = crypto_alloc_skcipher("ecb(cipher_null)",
0, CRYPTO_ALG_ASYNC);
tfm = crypto_alloc_sync_skcipher("ecb(cipher_null)", 0, 0);
if (IS_ERR(tfm))
goto unlock;
@ -182,7 +181,7 @@ void crypto_put_default_null_skcipher(void)
{
mutex_lock(&crypto_default_null_skcipher_lock);
if (!--crypto_default_null_skcipher_refcnt) {
crypto_free_skcipher(crypto_default_null_skcipher);
crypto_free_sync_skcipher(crypto_default_null_skcipher);
crypto_default_null_skcipher = NULL;
}
mutex_unlock(&crypto_default_null_skcipher_lock);

4
crypto/echainiv.c
View File

@ -47,9 +47,9 @@ static int echainiv_encrypt(struct aead_request *req)
info = req->iv;
if (req->src != req->dst) {
SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull);
SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull);
skcipher_request_set_tfm(nreq, ctx->sknull);
skcipher_request_set_sync_tfm(nreq, ctx->sknull);
skcipher_request_set_callback(nreq, req->base.flags,
NULL, NULL);
skcipher_request_set_crypt(nreq, req->src, req->dst,

8
crypto/gcm.c
View File

@ -50,7 +50,7 @@ struct crypto_rfc4543_instance_ctx {
struct crypto_rfc4543_ctx {
struct crypto_aead *child;
struct crypto_skcipher *null;
struct crypto_sync_skcipher *null;
u8 nonce[4];
};
@ -1074,9 +1074,9 @@ static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
unsigned int authsize = crypto_aead_authsize(aead);
unsigned int nbytes = req->assoclen + req->cryptlen -
(enc ? 0 : authsize);
SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
skcipher_request_set_tfm(nreq, ctx->null);
skcipher_request_set_sync_tfm(nreq, ctx->null);
skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
@ -1100,7 +1100,7 @@ static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
struct crypto_aead_spawn *spawn = &ictx->aead;
struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_aead *aead;
struct crypto_skcipher *null;
struct crypto_sync_skcipher *null;
unsigned long align;
int err = 0;

4
crypto/seqiv.c
View File

@ -73,9 +73,9 @@ static int seqiv_aead_encrypt(struct aead_request *req)
info = req->iv;
if (req->src != req->dst) {
SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull);
SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull);
skcipher_request_set_tfm(nreq, ctx->sknull);
skcipher_request_set_sync_tfm(nreq, ctx->sknull);
skcipher_request_set_callback(nreq, req->base.flags,
NULL, NULL);
skcipher_request_set_crypt(nreq, req->src, req->dst,

2
include/crypto/internal/geniv.h
View File

@ -20,7 +20,7 @@
struct aead_geniv_ctx {
spinlock_t lock;
struct crypto_aead *child;
struct crypto_skcipher *sknull;
struct crypto_sync_skcipher *sknull;
u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
};

2
include/crypto/null.h
View File

@ -9,7 +9,7 @@
#define NULL_DIGEST_SIZE 0
#define NULL_IV_SIZE 0
struct crypto_skcipher *crypto_get_default_null_skcipher(void);
struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void);
void crypto_put_default_null_skcipher(void);
static inline struct crypto_skcipher *crypto_get_default_null_skcipher2(void)