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crypto: qce - Remove VLA usage of skcipher 

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

Cc: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kees Cook 2018-09-18 19:10:54 -07:00 committed by Herbert Xu
parent ba70152b60
commit d1e4ba83b0
2 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/crypto/qce/ablkcipher.c
View File

@ -189,7 +189,7 @@ static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key,
memcpy(ctx->enc_key, key, keylen);
return 0;
fallback:
ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
if (!ret)
ctx->enc_keylen = keylen;
return ret;
@ -212,9 +212,9 @@ static int qce_ablkcipher_crypt(struct ablkcipher_request *req, int encrypt)
if (IS_AES(rctx->flags) && ctx->enc_keylen != AES_KEYSIZE_128 &&
ctx->enc_keylen != AES_KEYSIZE_256) {
SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
skcipher_request_set_tfm(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,
@ -245,9 +245,8 @@ static int qce_ablkcipher_init(struct crypto_tfm *tfm)
memset(ctx, 0, sizeof(*ctx));
tfm->crt_ablkcipher.reqsize = sizeof(struct qce_cipher_reqctx);
ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(tfm), 0,
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK);
ctx->fallback = crypto_alloc_sync_skcipher(crypto_tfm_alg_name(tfm),
0, CRYPTO_ALG_NEED_FALLBACK);
return PTR_ERR_OR_ZERO(ctx->fallback);
}
@ -255,7 +254,7 @@ static void qce_ablkcipher_exit(struct crypto_tfm *tfm)
{
struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
crypto_free_skcipher(ctx->fallback);
crypto_free_sync_skcipher(ctx->fallback);
}
struct qce_ablkcipher_def {

2
drivers/crypto/qce/cipher.h
View File

@ -22,7 +22,7 @@
struct qce_cipher_ctx {
u8 enc_key[QCE_MAX_KEY_SIZE];
unsigned int enc_keylen;
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
};
/**