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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/ahash.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/ahash.c')
-rw-r--r--crypto/ahash.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c
index a64c143165b1..78aaf2158c43 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -550,8 +550,8 @@ static int ahash_prepare_alg(struct ahash_alg *alg)
{
struct crypto_alg *base = &alg->halg.base;
- if (alg->halg.digestsize > PAGE_SIZE / 8 ||
- alg->halg.statesize > PAGE_SIZE / 8 ||
+ if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE ||
+ alg->halg.statesize > HASH_MAX_STATESIZE ||
alg->halg.statesize == 0)
return -EINVAL;