From 877b5691f27a1aec0d9b53095a323e45c30069e2 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sun, 14 Apr 2019 17:37:09 -0700 Subject: 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 Signed-off-by: Herbert Xu --- lib/crc-t10dif.c | 1 - lib/digsig.c | 1 - lib/libcrc32c.c | 1 - 3 files changed, 3 deletions(-) (limited to 'lib') diff --git a/lib/crc-t10dif.c b/lib/crc-t10dif.c index 4d0d47c1ffbd..e89ebfdbb0fc 100644 --- a/lib/crc-t10dif.c +++ b/lib/crc-t10dif.c @@ -69,7 +69,6 @@ __u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len) rcu_read_lock(); desc.shash.tfm = rcu_dereference(crct10dif_tfm); - desc.shash.flags = 0; *(__u16 *)desc.ctx = crc; err = crypto_shash_update(&desc.shash, buffer, len); diff --git a/lib/digsig.c b/lib/digsig.c index 6ba6fcd92dd1..3b0a579bdcdf 100644 --- a/lib/digsig.c +++ b/lib/digsig.c @@ -240,7 +240,6 @@ int digsig_verify(struct key *keyring, const char *sig, int siglen, goto err; desc->tfm = shash; - desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; crypto_shash_init(desc); crypto_shash_update(desc, data, datalen); diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c index f0a2934605bf..4e9829c4d64c 100644 --- a/lib/libcrc32c.c +++ b/lib/libcrc32c.c @@ -47,7 +47,6 @@ u32 crc32c(u32 crc, const void *address, unsigned int length) int err; shash->tfm = tfm; - shash->flags = 0; *ctx = crc; err = crypto_shash_update(shash, address, length); -- cgit v1.2.3-59-g8ed1b