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crypto: amlogic-gxl - permit async skcipher as fallback 

Even though the amlogic-gxl driver implements asynchronous versions of
ecb(aes) and cbc(aes), the fallbacks it allocates are required to be
synchronous. Given that SIMD based software implementations are usually
asynchronous as well, even though they rarely complete asynchronously
(this typically only happens in cases where the request was made from
softirq context, while SIMD was already in use in the task context that
it interrupted), these implementations are disregarded, and either the
generic C version or another table based version implemented in assembler
is selected instead.

Since falling back to synchronous AES is not only a performance issue,
but potentially a security issue as well (due to the fact that table
based AES is not time invariant), let's fix this, by allocating an
ordinary skcipher as the fallback, and invoke it with the completion
routine that was given to the outer request.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2020-07-07 09:31:52 +03:00 committed by Herbert Xu
parent 3f368b886e
commit 1d63e4557f
2 changed files with 15 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/crypto/amlogic/amlogic-gxl-cipher.c
View File

@ -64,22 +64,20 @@ static int meson_cipher_do_fallback(struct skcipher_request *areq)
#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct meson_alg_template *algt;
#endif
SYNC_SKCIPHER_REQUEST_ON_STACK(req, op->fallback_tfm);
#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
algt = container_of(alg, struct meson_alg_template, alg.skcipher);
algt->stat_fb++;
#endif
skcipher_request_set_sync_tfm(req, op->fallback_tfm);
skcipher_request_set_callback(req, areq->base.flags, NULL, NULL);
skcipher_request_set_crypt(req, areq->src, areq->dst,
skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
areq->base.complete, areq->base.data);
skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
areq->cryptlen, areq->iv);
if (rctx->op_dir == MESON_DECRYPT)
err = crypto_skcipher_decrypt(req);
err = crypto_skcipher_decrypt(&rctx->fallback_req);
else
err = crypto_skcipher_encrypt(req);
skcipher_request_zero(req);
err = crypto_skcipher_encrypt(&rctx->fallback_req);
return err;
}
@ -321,15 +319,16 @@ int meson_cipher_init(struct crypto_tfm *tfm)
algt = container_of(alg, struct meson_alg_template, alg.skcipher);
op->mc = algt->mc;
sktfm->reqsize = sizeof(struct meson_cipher_req_ctx);
op->fallback_tfm = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(op->fallback_tfm)) {
dev_err(op->mc->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
name, PTR_ERR(op->fallback_tfm));
return PTR_ERR(op->fallback_tfm);
}
sktfm->reqsize = sizeof(struct meson_cipher_req_ctx) +
crypto_skcipher_reqsize(op->fallback_tfm);
op->enginectx.op.do_one_request = meson_handle_cipher_request;
op->enginectx.op.prepare_request = NULL;
op->enginectx.op.unprepare_request = NULL;
@ -345,7 +344,7 @@ void meson_cipher_exit(struct crypto_tfm *tfm)
memzero_explicit(op->key, op->keylen);
kfree(op->key);
}
crypto_free_sync_skcipher(op->fallback_tfm);
crypto_free_skcipher(op->fallback_tfm);
}
int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
@ -377,5 +376,5 @@ int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
if (!op->key)
return -ENOMEM;
return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
}

3
drivers/crypto/amlogic/amlogic-gxl.h
View File

@ -109,6 +109,7 @@ struct meson_dev {
struct meson_cipher_req_ctx {
u32 op_dir;
int flow;
struct skcipher_request fallback_req; // keep at the end
};
/*
@ -126,7 +127,7 @@ struct meson_cipher_tfm_ctx {
u32 keylen;
u32 keymode;
struct meson_dev *mc;
struct crypto_sync_skcipher *fallback_tfm;
struct crypto_skcipher *fallback_tfm;
};
/*