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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Eric Biggers](/assets/img/avatar_default.png)
All instances need to have a ->free() method, but people could forget to set it and then not notice if the instance is never unregistered. To help detect this bug earlier, don't allow an instance without a ->free() method to be registered, and complain loudly if someone tries to do it. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
682 lines
16 KiB
C
682 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Asynchronous Cryptographic Hash operations.
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*
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* This is the asynchronous version of hash.c with notification of
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* completion via a callback.
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*
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* Copyright (c) 2008 Loc Ho <lho@amcc.com>
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*/
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#include <crypto/internal/hash.h>
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#include <crypto/scatterwalk.h>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <linux/cryptouser.h>
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#include <linux/compiler.h>
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#include <net/netlink.h>
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#include "internal.h"
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static const struct crypto_type crypto_ahash_type;
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struct ahash_request_priv {
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crypto_completion_t complete;
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void *data;
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u8 *result;
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u32 flags;
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void *ubuf[] CRYPTO_MINALIGN_ATTR;
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};
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static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
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{
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return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
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halg);
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}
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static int hash_walk_next(struct crypto_hash_walk *walk)
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{
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unsigned int alignmask = walk->alignmask;
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unsigned int offset = walk->offset;
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unsigned int nbytes = min(walk->entrylen,
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((unsigned int)(PAGE_SIZE)) - offset);
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if (walk->flags & CRYPTO_ALG_ASYNC)
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walk->data = kmap(walk->pg);
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else
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walk->data = kmap_atomic(walk->pg);
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walk->data += offset;
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if (offset & alignmask) {
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unsigned int unaligned = alignmask + 1 - (offset & alignmask);
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if (nbytes > unaligned)
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nbytes = unaligned;
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}
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walk->entrylen -= nbytes;
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return nbytes;
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}
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static int hash_walk_new_entry(struct crypto_hash_walk *walk)
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{
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struct scatterlist *sg;
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sg = walk->sg;
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walk->offset = sg->offset;
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walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
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walk->offset = offset_in_page(walk->offset);
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walk->entrylen = sg->length;
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if (walk->entrylen > walk->total)
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walk->entrylen = walk->total;
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walk->total -= walk->entrylen;
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return hash_walk_next(walk);
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}
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int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
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{
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unsigned int alignmask = walk->alignmask;
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walk->data -= walk->offset;
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if (walk->entrylen && (walk->offset & alignmask) && !err) {
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unsigned int nbytes;
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walk->offset = ALIGN(walk->offset, alignmask + 1);
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nbytes = min(walk->entrylen,
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(unsigned int)(PAGE_SIZE - walk->offset));
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if (nbytes) {
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walk->entrylen -= nbytes;
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walk->data += walk->offset;
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return nbytes;
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}
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}
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if (walk->flags & CRYPTO_ALG_ASYNC)
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kunmap(walk->pg);
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else {
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kunmap_atomic(walk->data);
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/*
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* The may sleep test only makes sense for sync users.
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* Async users don't need to sleep here anyway.
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*/
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crypto_yield(walk->flags);
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}
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if (err)
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return err;
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if (walk->entrylen) {
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walk->offset = 0;
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walk->pg++;
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return hash_walk_next(walk);
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}
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if (!walk->total)
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return 0;
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walk->sg = sg_next(walk->sg);
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
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int crypto_hash_walk_first(struct ahash_request *req,
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struct crypto_hash_walk *walk)
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{
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walk->total = req->nbytes;
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if (!walk->total) {
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walk->entrylen = 0;
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return 0;
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}
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walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
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walk->sg = req->src;
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walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
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int crypto_ahash_walk_first(struct ahash_request *req,
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struct crypto_hash_walk *walk)
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{
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walk->total = req->nbytes;
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if (!walk->total) {
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walk->entrylen = 0;
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return 0;
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}
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walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
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walk->sg = req->src;
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walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
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walk->flags |= CRYPTO_ALG_ASYNC;
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BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
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static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = tfm->setkey(tfm, alignbuffer, keylen);
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kzfree(buffer);
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return ret;
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}
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static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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return -ENOSYS;
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}
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static void ahash_set_needkey(struct crypto_ahash *tfm)
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{
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const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
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if (tfm->setkey != ahash_nosetkey &&
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!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
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crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
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}
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int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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int err;
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if ((unsigned long)key & alignmask)
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err = ahash_setkey_unaligned(tfm, key, keylen);
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else
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err = tfm->setkey(tfm, key, keylen);
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if (unlikely(err)) {
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ahash_set_needkey(tfm);
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return err;
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}
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crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
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static inline unsigned int ahash_align_buffer_size(unsigned len,
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unsigned long mask)
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{
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return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
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}
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static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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unsigned int ds = crypto_ahash_digestsize(tfm);
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struct ahash_request_priv *priv;
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priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
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(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC);
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if (!priv)
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return -ENOMEM;
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/*
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* WARNING: Voodoo programming below!
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*
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* The code below is obscure and hard to understand, thus explanation
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* is necessary. See include/crypto/hash.h and include/linux/crypto.h
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* to understand the layout of structures used here!
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*
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* The code here will replace portions of the ORIGINAL request with
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* pointers to new code and buffers so the hashing operation can store
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* the result in aligned buffer. We will call the modified request
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* an ADJUSTED request.
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*
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* The newly mangled request will look as such:
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*
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* req {
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* .result = ADJUSTED[new aligned buffer]
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* .base.complete = ADJUSTED[pointer to completion function]
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* .base.data = ADJUSTED[*req (pointer to self)]
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* .priv = ADJUSTED[new priv] {
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* .result = ORIGINAL(result)
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* .complete = ORIGINAL(base.complete)
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* .data = ORIGINAL(base.data)
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* }
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*/
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priv->result = req->result;
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priv->complete = req->base.complete;
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priv->data = req->base.data;
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priv->flags = req->base.flags;
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/*
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* WARNING: We do not backup req->priv here! The req->priv
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* is for internal use of the Crypto API and the
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* user must _NOT_ _EVER_ depend on it's content!
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*/
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req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
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req->base.complete = cplt;
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req->base.data = req;
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req->priv = priv;
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return 0;
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}
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static void ahash_restore_req(struct ahash_request *req, int err)
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{
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struct ahash_request_priv *priv = req->priv;
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if (!err)
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memcpy(priv->result, req->result,
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crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
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/* Restore the original crypto request. */
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req->result = priv->result;
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ahash_request_set_callback(req, priv->flags,
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priv->complete, priv->data);
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req->priv = NULL;
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/* Free the req->priv.priv from the ADJUSTED request. */
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kzfree(priv);
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}
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static void ahash_notify_einprogress(struct ahash_request *req)
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{
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struct ahash_request_priv *priv = req->priv;
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struct crypto_async_request oreq;
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oreq.data = priv->data;
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priv->complete(&oreq, -EINPROGRESS);
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}
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static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
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{
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struct ahash_request *areq = req->data;
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if (err == -EINPROGRESS) {
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ahash_notify_einprogress(areq);
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return;
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}
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/*
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* Restore the original request, see ahash_op_unaligned() for what
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* goes where.
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*
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* The "struct ahash_request *req" here is in fact the "req.base"
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* from the ADJUSTED request from ahash_op_unaligned(), thus as it
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* is a pointer to self, it is also the ADJUSTED "req" .
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*/
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/* First copy req->result into req->priv.result */
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ahash_restore_req(areq, err);
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/* Complete the ORIGINAL request. */
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areq->base.complete(&areq->base, err);
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}
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static int ahash_op_unaligned(struct ahash_request *req,
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int (*op)(struct ahash_request *))
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{
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int err;
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err = ahash_save_req(req, ahash_op_unaligned_done);
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if (err)
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return err;
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err = op(req);
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if (err == -EINPROGRESS || err == -EBUSY)
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return err;
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ahash_restore_req(req, err);
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return err;
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}
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static int crypto_ahash_op(struct ahash_request *req,
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int (*op)(struct ahash_request *))
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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if ((unsigned long)req->result & alignmask)
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return ahash_op_unaligned(req, op);
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return op(req);
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}
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int crypto_ahash_final(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct crypto_alg *alg = tfm->base.__crt_alg;
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unsigned int nbytes = req->nbytes;
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int ret;
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crypto_stats_get(alg);
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ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
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crypto_stats_ahash_final(nbytes, ret, alg);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_final);
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int crypto_ahash_finup(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct crypto_alg *alg = tfm->base.__crt_alg;
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unsigned int nbytes = req->nbytes;
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int ret;
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crypto_stats_get(alg);
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ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
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crypto_stats_ahash_final(nbytes, ret, alg);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_finup);
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int crypto_ahash_digest(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct crypto_alg *alg = tfm->base.__crt_alg;
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unsigned int nbytes = req->nbytes;
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int ret;
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crypto_stats_get(alg);
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if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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ret = -ENOKEY;
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else
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ret = crypto_ahash_op(req, tfm->digest);
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crypto_stats_ahash_final(nbytes, ret, alg);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_digest);
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static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
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{
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struct ahash_request *areq = req->data;
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if (err == -EINPROGRESS)
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return;
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ahash_restore_req(areq, err);
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areq->base.complete(&areq->base, err);
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}
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static int ahash_def_finup_finish1(struct ahash_request *req, int err)
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{
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if (err)
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goto out;
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req->base.complete = ahash_def_finup_done2;
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err = crypto_ahash_reqtfm(req)->final(req);
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if (err == -EINPROGRESS || err == -EBUSY)
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return err;
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out:
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ahash_restore_req(req, err);
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return err;
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}
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static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
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{
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struct ahash_request *areq = req->data;
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if (err == -EINPROGRESS) {
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ahash_notify_einprogress(areq);
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return;
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}
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areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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err = ahash_def_finup_finish1(areq, err);
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if (areq->priv)
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return;
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areq->base.complete(&areq->base, err);
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}
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static int ahash_def_finup(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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int err;
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err = ahash_save_req(req, ahash_def_finup_done1);
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if (err)
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return err;
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err = tfm->update(req);
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if (err == -EINPROGRESS || err == -EBUSY)
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return err;
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return ahash_def_finup_finish1(req, err);
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}
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static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
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struct ahash_alg *alg = crypto_ahash_alg(hash);
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hash->setkey = ahash_nosetkey;
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if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
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return crypto_init_shash_ops_async(tfm);
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hash->init = alg->init;
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hash->update = alg->update;
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hash->final = alg->final;
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hash->finup = alg->finup ?: ahash_def_finup;
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hash->digest = alg->digest;
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hash->export = alg->export;
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hash->import = alg->import;
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if (alg->setkey) {
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hash->setkey = alg->setkey;
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ahash_set_needkey(hash);
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}
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return 0;
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}
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static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
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{
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if (alg->cra_type != &crypto_ahash_type)
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return sizeof(struct crypto_shash *);
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return crypto_alg_extsize(alg);
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}
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static void crypto_ahash_free_instance(struct crypto_instance *inst)
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{
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struct ahash_instance *ahash = ahash_instance(inst);
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ahash->free(ahash);
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}
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#ifdef CONFIG_NET
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static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_hash rhash;
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memset(&rhash, 0, sizeof(rhash));
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|
strscpy(rhash.type, "ahash", sizeof(rhash.type));
|
|
|
|
rhash.blocksize = alg->cra_blocksize;
|
|
rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
|
|
|
|
return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
|
|
}
|
|
#else
|
|
static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
|
|
__maybe_unused;
|
|
static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
|
|
{
|
|
seq_printf(m, "type : ahash\n");
|
|
seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
|
|
"yes" : "no");
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
|
seq_printf(m, "digestsize : %u\n",
|
|
__crypto_hash_alg_common(alg)->digestsize);
|
|
}
|
|
|
|
static const struct crypto_type crypto_ahash_type = {
|
|
.extsize = crypto_ahash_extsize,
|
|
.init_tfm = crypto_ahash_init_tfm,
|
|
.free = crypto_ahash_free_instance,
|
|
#ifdef CONFIG_PROC_FS
|
|
.show = crypto_ahash_show,
|
|
#endif
|
|
.report = crypto_ahash_report,
|
|
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
|
|
.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
|
|
.type = CRYPTO_ALG_TYPE_AHASH,
|
|
.tfmsize = offsetof(struct crypto_ahash, base),
|
|
};
|
|
|
|
int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
|
|
struct crypto_instance *inst,
|
|
const char *name, u32 type, u32 mask)
|
|
{
|
|
spawn->base.frontend = &crypto_ahash_type;
|
|
return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_grab_ahash);
|
|
|
|
struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
|
|
u32 mask)
|
|
{
|
|
return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
|
|
|
|
int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
|
|
{
|
|
return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_has_ahash);
|
|
|
|
static int ahash_prepare_alg(struct ahash_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->halg.base;
|
|
|
|
if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE ||
|
|
alg->halg.statesize > HASH_MAX_STATESIZE ||
|
|
alg->halg.statesize == 0)
|
|
return -EINVAL;
|
|
|
|
base->cra_type = &crypto_ahash_type;
|
|
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
|
|
base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int crypto_register_ahash(struct ahash_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->halg.base;
|
|
int err;
|
|
|
|
err = ahash_prepare_alg(alg);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_register_alg(base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_ahash);
|
|
|
|
void crypto_unregister_ahash(struct ahash_alg *alg)
|
|
{
|
|
crypto_unregister_alg(&alg->halg.base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
|
|
|
|
int crypto_register_ahashes(struct ahash_alg *algs, int count)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
ret = crypto_register_ahash(&algs[i]);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
for (--i; i >= 0; --i)
|
|
crypto_unregister_ahash(&algs[i]);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_ahashes);
|
|
|
|
void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = count - 1; i >= 0; --i)
|
|
crypto_unregister_ahash(&algs[i]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
|
|
|
|
int ahash_register_instance(struct crypto_template *tmpl,
|
|
struct ahash_instance *inst)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON(!inst->free))
|
|
return -EINVAL;
|
|
|
|
err = ahash_prepare_alg(&inst->alg);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
|
|
}
|
|
EXPORT_SYMBOL_GPL(ahash_register_instance);
|
|
|
|
bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
|
|
{
|
|
struct crypto_alg *alg = &halg->base;
|
|
|
|
if (alg->cra_type != &crypto_ahash_type)
|
|
return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
|
|
|
|
return __crypto_ahash_alg(alg)->setkey != NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
|