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| author |   Kees Cook <keescook@chromium.org> | 2018-08-07 14:18:38 -0700 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2018-09-04 11:35:03 +0800 |
| commit | b68a7ec1e9a3efac53ae26a1658a553825a2375c (patch) | |
| tree | 6ad87c86f0fc4aeafee091c6d43043876f081d0b /crypto/algif_hash.c | |
| parent | crypto: ccm - Remove VLA usage (diff) | |
| download | linux-dev-b68a7ec1e9a3efac53ae26a1658a553825a2375c.tar.xz linux-dev-b68a7ec1e9a3efac53ae26a1658a553825a2375c.zip | |
crypto: hash - Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this
removes the VLAs in SHASH_DESC_ON_STACK (via crypto_shash_descsize())
by using the maximum allowable size (which is now more clearly captured
in a macro), along with a few other cases. Similar limits are turned into
macros as well.
A review of existing sizes shows that SHA512_DIGEST_SIZE (64) is the
largest digest size and that sizeof(struct sha3_state) (360) is the
largest descriptor size. The corresponding maximums are reduced.
[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>
Diffstat (limited to 'crypto/algif_hash.c')
| -rw-r--r-- | crypto/algif_hash.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index bfcf595fd8f9..d0cde541beb6 100644 --- a/crypto/algif_hash.c +++ b/crypto/algif_hash.c @@ -239,7 +239,7 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags, struct alg_sock *ask = alg_sk(sk); struct hash_ctx *ctx = ask->private; struct ahash_request *req = &ctx->req; - char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1]; + char state[HASH_MAX_STATESIZE]; struct sock *sk2; struct alg_sock *ask2; struct hash_ctx *ctx2; |