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authorKees Cook <keescook@chromium.org>2018-08-08 00:18:38 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-09-04 06:35:03 +0300
commitb68a7ec1e9a3efac53ae26a1658a553825a2375c (patch)
tree6ad87c86f0fc4aeafee091c6d43043876f081d0b /crypto/shash.c
parentebf533adc877d9171800bbce77372d8051fc35c2 (diff)
downloadlinux-b68a7ec1e9a3efac53ae26a1658a553825a2375c.tar.xz
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/shash.c')
-rw-r--r--crypto/shash.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/crypto/shash.c b/crypto/shash.c
index 5d732c6bb4b2..86d76b5c626c 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -458,9 +458,9 @@ static int shash_prepare_alg(struct shash_alg *alg)
{
struct crypto_alg *base = &alg->base;
- if (alg->digestsize > PAGE_SIZE / 8 ||
- alg->descsize > PAGE_SIZE / 8 ||
- alg->statesize > PAGE_SIZE / 8)
+ if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
+ alg->descsize > HASH_MAX_DESCSIZE ||
+ alg->statesize > HASH_MAX_STATESIZE)
return -EINVAL;
base->cra_type = &crypto_shash_type;