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crypto: shash - Cap state size to HASH_MAX_STATESIZE

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Now that all shash algorithms have converted over to the generic
export format, limit the shash state size to HASH_MAX_STATESIZE.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-05-04 21:33:14 +08:00
parent ecd71c95a6
commit 2b1a29ce33
2 changed files with 6 additions and 1 deletions
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2
crypto/shash.c
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@ -479,6 +479,8 @@ static int shash_prepare_alg(struct shash_alg *alg)
if (alg->descsize > HASH_MAX_DESCSIZE)
return -EINVAL;
if (alg->statesize > HASH_MAX_STATESIZE)
return -EINVAL;
return 0;
}

5
include/crypto/hash.h
View File

@ -167,8 +167,11 @@ struct shash_desc {
#define HASH_MAX_DIGESTSIZE 64
/* Worst case is sha3-224. */
#define HASH_MAX_STATESIZE 200 + 144 + 1
/*
* Worst case is hmac(sha-224-s390). Its context is a nested 'shash_desc'
* Worst case is hmac(sha3-224-s390). Its context is a nested 'shash_desc'
* containing a 'struct s390_sha_ctx'.
*/
#define HASH_MAX_DESCSIZE (sizeof(struct shash_desc) + 360)