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crypto: omap-aes - permit asynchronous skcipher as fallback

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Even though the omap-aes driver implements asynchronous versions of
ecb(aes), cbc(aes) and ctr(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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2020-07-07 09:31:53 +03:00 committed by Herbert Xu
parent 1d63e4557f
commit 6a99d7a2d7
2 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/crypto/omap-aes.c
View File

@ -548,20 +548,18 @@ static int omap_aes_crypt(struct skcipher_request *req, unsigned long mode)
!!(mode & FLAGS_CBC));
if (req->cryptlen < aes_fallback_sz) {
SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
skcipher_request_set_sync_tfm(subreq, ctx->fallback);
skcipher_request_set_callback(subreq, req->base.flags, NULL,
NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst,
req->cryptlen, req->iv);
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
skcipher_request_set_callback(&rctx->fallback_req,
req->base.flags,
req->base.complete,
req->base.data);
skcipher_request_set_crypt(&rctx->fallback_req, req->src,
req->dst, req->cryptlen, req->iv);
if (mode & FLAGS_ENCRYPT)
ret = crypto_skcipher_encrypt(subreq);
ret = crypto_skcipher_encrypt(&rctx->fallback_req);
else
ret = crypto_skcipher_decrypt(subreq);
skcipher_request_zero(subreq);
ret = crypto_skcipher_decrypt(&rctx->fallback_req);
return ret;
}
dd = omap_aes_find_dev(rctx);
@ -590,11 +588,11 @@ static int omap_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;
crypto_sync_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
crypto_sync_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
CRYPTO_TFM_REQ_MASK);
ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
if (!ret)
return 0;
@ -640,15 +638,16 @@ static int omap_aes_init_tfm(struct crypto_skcipher *tfm)
{
const char *name = crypto_tfm_alg_name(&tfm->base);
struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_sync_skcipher *blk;
struct crypto_skcipher *blk;
blk = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
blk = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(blk))
return PTR_ERR(blk);
ctx->fallback = blk;
crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx));
crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx) +
crypto_skcipher_reqsize(blk));
ctx->enginectx.op.prepare_request = omap_aes_prepare_req;
ctx->enginectx.op.unprepare_request = NULL;
@ -662,7 +661,7 @@ static void omap_aes_exit_tfm(struct crypto_skcipher *tfm)
struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
if (ctx->fallback)
crypto_free_sync_skcipher(ctx->fallback);
crypto_free_skcipher(ctx->fallback);
ctx->fallback = NULL;
}

3
drivers/crypto/omap-aes.h
View File

@ -97,7 +97,7 @@ struct omap_aes_ctx {
int keylen;
u32 key[AES_KEYSIZE_256 / sizeof(u32)];
u8 nonce[4];
struct crypto_sync_skcipher *fallback;
struct crypto_skcipher *fallback;
};
struct omap_aes_gcm_ctx {
@ -110,6 +110,7 @@ struct omap_aes_reqctx {
unsigned long mode;
u8 iv[AES_BLOCK_SIZE];
u32 auth_tag[AES_BLOCK_SIZE / sizeof(u32)];
struct skcipher_request fallback_req; // keep at the end
};
#define OMAP_AES_QUEUE_LENGTH 1