[v2 PATCH 6/9] crypto: api - Increase MAX_ALGAPI_ALIGNMASK to 127
From: "Herbert Xu" <herbert@gondor.apana.org.au>
Date: 2022-11-25 04:37:13
Also in:
linux-crypto, linux-mm, lkml
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
Previously we limited the maximum alignment mask to 63. This is mostly due to stack usage for shash. This patch introduces a separate limit for shash algorithms and increases the general limit to 127 which is the value that we need for DMA allocations on arm64. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> --- crypto/shash.c | 9 +++++++-- include/crypto/algapi.h | 2 +- 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/crypto/shash.c b/crypto/shash.c
index 4c88e63b3350..22c744389586 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c@@ -18,6 +18,8 @@ #include "internal.h" +#define MAX_SHASH_ALIGNMASK 63 + static const struct crypto_type crypto_shash_type; static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
@@ -100,7 +102,7 @@ static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, * We cannot count on __aligned() working for large values: * https://patchwork.kernel.org/patch/9507697/ */ - u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2]; + u8 ubuf[MAX_SHASH_ALIGNMASK * 2]; u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); int err;
@@ -142,7 +144,7 @@ static int shash_final_unaligned(struct shash_desc *desc, u8 *out) * We cannot count on __aligned() working for large values: * https://patchwork.kernel.org/patch/9507697/ */ - u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE]; + u8 ubuf[MAX_SHASH_ALIGNMASK + HASH_MAX_DIGESTSIZE]; u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); int err;
@@ -536,6 +538,9 @@ static int shash_prepare_alg(struct shash_alg *alg) alg->statesize > HASH_MAX_STATESIZE) return -EINVAL; + if (base->cra_alignmask > MAX_SHASH_ALIGNMASK) + return -EINVAL; + if ((alg->export && !alg->import) || (alg->import && !alg->export)) return -EINVAL;
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 4c99eb66e654..8722fd67f40a 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h@@ -22,7 +22,7 @@ * algs and architectures. Ciphers have a lower maximum size. */ #define MAX_ALGAPI_BLOCKSIZE 160 -#define MAX_ALGAPI_ALIGNMASK 63 +#define MAX_ALGAPI_ALIGNMASK 127 #define MAX_CIPHER_BLOCKSIZE 16 #define MAX_CIPHER_ALIGNMASK 15
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