diff options
| author | Eric Biggers <ebiggers@google.com> | 2019-04-15 02:37:09 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-04-25 09:38:12 +0200 |
| commit | 877b5691f27a1aec0d9b53095a323e45c30069e2 (patch) | |
| tree | 59eba93e8d253fb0e12a0a2040de99e96e873933 /crypto/asymmetric_keys | |
| parent | crypto: nx - don't abuse shash MAY_SLEEP flag (diff) | |
| download | linux-877b5691f27a1aec0d9b53095a323e45c30069e2.tar.xz linux-877b5691f27a1aec0d9b53095a323e45c30069e2.zip | |
crypto: shash - remove shash_desc::flags
The flags field in 'struct shash_desc' never actually does anything.
The only ostensibly supported flag is CRYPTO_TFM_REQ_MAY_SLEEP.
However, no shash algorithm ever sleeps, making this flag a no-op.
With this being the case, inevitably some users who can't sleep wrongly
pass MAY_SLEEP. These would all need to be fixed if any shash algorithm
actually started sleeping. For example, the shash_ahash_*() functions,
which wrap a shash algorithm with the ahash API, pass through MAY_SLEEP
from the ahash API to the shash API. However, the shash functions are
called under kmap_atomic(), so actually they're assumed to never sleep.
Even if it turns out that some users do need preemption points while
hashing large buffers, we could easily provide a helper function
crypto_shash_update_large() which divides the data into smaller chunks
and calls crypto_shash_update() and cond_resched() for each chunk. It's
not necessary to have a flag in 'struct shash_desc', nor is it necessary
to make individual shash algorithms aware of this at all.
Therefore, remove shash_desc::flags, and document that the
crypto_shash_*() functions can be called from any context.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/asymmetric_keys')
| -rw-r--r-- | crypto/asymmetric_keys/pkcs7_verify.c | 1 | ||||
| -rw-r--r-- | crypto/asymmetric_keys/verify_pefile.c | 1 | ||||
| -rw-r--r-- | crypto/asymmetric_keys/x509_public_key.c | 1 |
3 files changed, 0 insertions, 3 deletions
diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c index 97c77f66b20d..f7b0980bf02d 100644 --- a/crypto/asymmetric_keys/pkcs7_verify.c +++ b/crypto/asymmetric_keys/pkcs7_verify.c @@ -56,7 +56,6 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7, goto error_no_desc; desc->tfm = tfm; - desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; /* Digest the message [RFC2315 9.3] */ ret = crypto_shash_digest(desc, pkcs7->data, pkcs7->data_len, diff --git a/crypto/asymmetric_keys/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c index d178650fd524..f8e4a932bcfb 100644 --- a/crypto/asymmetric_keys/verify_pefile.c +++ b/crypto/asymmetric_keys/verify_pefile.c @@ -354,7 +354,6 @@ static int pefile_digest_pe(const void *pebuf, unsigned int pelen, goto error_no_desc; desc->tfm = tfm; - desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; ret = crypto_shash_init(desc); if (ret < 0) goto error; diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index 9338b4558cdc..bd96683d8cde 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -77,7 +77,6 @@ int x509_get_sig_params(struct x509_certificate *cert) goto error; desc->tfm = tfm; - desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; ret = crypto_shash_digest(desc, cert->tbs, cert->tbs_size, sig->digest); if (ret < 0) |