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@xxxxxxxxxxxxxx Cc: Alexander Aring <alex.aring@xxxxxxxxx> Cc: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx> Cc: linux-wpan@xxxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- net/mac802154/llsec.c | 16 ++++++++-------- net/mac802154/llsec.h | 2 +- 2 files changed, 9 insertions(+), 9 deletions(-) diff --git a/net/mac802154/llsec.c b/net/mac802154/llsec.c index 2fb703d70803..7e29f88dbf6a 100644 --- a/net/mac802154/llsec.c +++ b/net/mac802154/llsec.c @@ -146,18 +146,18 @@ llsec_key_alloc(const struct ieee802154_llsec_key *template) goto err_tfm; } - key->tfm0 = crypto_alloc_skcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC); + key->tfm0 = crypto_alloc_sync_skcipher("ctr(aes)", 0, 0); if (IS_ERR(key->tfm0)) goto err_tfm; - if (crypto_skcipher_setkey(key->tfm0, template->key, + if (crypto_sync_skcipher_setkey(key->tfm0, template->key, IEEE802154_LLSEC_KEY_SIZE)) goto err_tfm0; return key; err_tfm0: - crypto_free_skcipher(key->tfm0); + crypto_free_sync_skcipher(key->tfm0); err_tfm: for (i = 0; i < ARRAY_SIZE(key->tfm); i++) if (key->tfm[i]) @@ -177,7 +177,7 @@ static void llsec_key_release(struct kref *ref) for (i = 0; i < ARRAY_SIZE(key->tfm); i++) crypto_free_aead(key->tfm[i]); - crypto_free_skcipher(key->tfm0); + crypto_free_sync_skcipher(key->tfm0); kzfree(key); } @@ -622,7 +622,7 @@ llsec_do_encrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, { u8 iv[16]; struct scatterlist src; - SKCIPHER_REQUEST_ON_STACK(req, key->tfm0); + SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->tfm0); int err, datalen; unsigned char *data; @@ -632,7 +632,7 @@ llsec_do_encrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, datalen = skb_tail_pointer(skb) - data; sg_init_one(&src, data, datalen); - skcipher_request_set_tfm(req, key->tfm0); + skcipher_request_set_sync_tfm(req, key->tfm0); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, &src, &src, datalen, iv); err = crypto_skcipher_encrypt(req); @@ -840,7 +840,7 @@ llsec_do_decrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, unsigned char *data; int datalen; struct scatterlist src; - SKCIPHER_REQUEST_ON_STACK(req, key->tfm0); + SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->tfm0); int err; llsec_geniv(iv, dev_addr, &hdr->sec); @@ -849,7 +849,7 @@ llsec_do_decrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, sg_init_one(&src, data, datalen); - skcipher_request_set_tfm(req, key->tfm0); + skcipher_request_set_sync_tfm(req, key->tfm0); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, &src, &src, datalen, iv); diff --git a/net/mac802154/llsec.h b/net/mac802154/llsec.h index 6f3b658e3279..8be46d74dc39 100644 --- a/net/mac802154/llsec.h +++ b/net/mac802154/llsec.h @@ -29,7 +29,7 @@ struct mac802154_llsec_key { /* one tfm for each authsize (4/8/16) */ struct crypto_aead *tfm[3]; - struct crypto_skcipher *tfm0; + struct crypto_sync_skcipher *tfm0; struct kref ref; }; -- 2.17.1
