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![Yehuda Sadeh](/assets/img/avatar_default.png)
When the total length is shorter than the calculated number of unaligned bytes, the call to shash->update breaks. For example, calling crc32c on unaligned buffer with length of 1 can result in a system crash. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
506 lines
13 KiB
C
506 lines
13 KiB
C
/*
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* Synchronous Cryptographic Hash operations.
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*
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* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/hash.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/slab.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static const struct crypto_type crypto_shash_type;
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static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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unsigned long absize;
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u8 *buffer, *alignbuffer;
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int err;
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absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
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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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err = shash->setkey(tfm, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return err;
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}
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int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (!shash->setkey)
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return -ENOSYS;
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if ((unsigned long)key & alignmask)
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return shash_setkey_unaligned(tfm, key, keylen);
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return shash->setkey(tfm, key, keylen);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_setkey);
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static inline unsigned int shash_align_buffer_size(unsigned len,
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unsigned long mask)
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{
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return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
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}
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static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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unsigned int unaligned_len = alignmask + 1 -
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((unsigned long)data & alignmask);
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u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
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__attribute__ ((aligned));
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if (unaligned_len > len)
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unaligned_len = len;
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memcpy(buf, data, unaligned_len);
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return shash->update(desc, buf, unaligned_len) ?:
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shash->update(desc, data + unaligned_len, len - unaligned_len);
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}
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int crypto_shash_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)data & alignmask)
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return shash_update_unaligned(desc, data, len);
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return shash->update(desc, data, len);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_update);
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static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned int ds = crypto_shash_digestsize(tfm);
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u8 buf[shash_align_buffer_size(ds, alignmask)]
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__attribute__ ((aligned));
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int err;
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err = shash->final(desc, buf);
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memcpy(out, buf, ds);
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return err;
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}
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int crypto_shash_final(struct shash_desc *desc, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)out & alignmask)
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return shash_final_unaligned(desc, out);
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return shash->final(desc, out);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_final);
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static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return crypto_shash_update(desc, data, len) ?:
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crypto_shash_final(desc, out);
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}
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int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (((unsigned long)data | (unsigned long)out) & alignmask ||
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!shash->finup)
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return shash_finup_unaligned(desc, data, len, out);
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return shash->finup(desc, data, len, out);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_finup);
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static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return crypto_shash_init(desc) ?:
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crypto_shash_update(desc, data, len) ?:
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crypto_shash_final(desc, out);
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}
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int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (((unsigned long)data | (unsigned long)out) & alignmask ||
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!shash->digest)
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return shash_digest_unaligned(desc, data, len, out);
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return shash->digest(desc, data, len, out);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_digest);
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int crypto_shash_import(struct shash_desc *desc, const u8 *in)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *alg = crypto_shash_alg(tfm);
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memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
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if (alg->reinit)
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alg->reinit(desc);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_shash_import);
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static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
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return crypto_shash_setkey(*ctx, key, keylen);
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}
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static int shash_async_init(struct ahash_request *req)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
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struct shash_desc *desc = ahash_request_ctx(req);
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desc->tfm = *ctx;
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desc->flags = req->base.flags;
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return crypto_shash_init(desc);
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}
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static int shash_async_update(struct ahash_request *req)
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{
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struct shash_desc *desc = ahash_request_ctx(req);
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struct crypto_hash_walk walk;
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int nbytes;
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for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
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nbytes = crypto_hash_walk_done(&walk, nbytes))
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nbytes = crypto_shash_update(desc, walk.data, nbytes);
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return nbytes;
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}
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static int shash_async_final(struct ahash_request *req)
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{
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return crypto_shash_final(ahash_request_ctx(req), req->result);
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}
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static int shash_async_digest(struct ahash_request *req)
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{
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struct scatterlist *sg = req->src;
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unsigned int offset = sg->offset;
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unsigned int nbytes = req->nbytes;
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int err;
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if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
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struct crypto_shash **ctx =
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crypto_ahash_ctx(crypto_ahash_reqtfm(req));
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struct shash_desc *desc = ahash_request_ctx(req);
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void *data;
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desc->tfm = *ctx;
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desc->flags = req->base.flags;
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data = crypto_kmap(sg_page(sg), 0);
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err = crypto_shash_digest(desc, data + offset, nbytes,
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req->result);
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crypto_kunmap(data, 0);
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crypto_yield(desc->flags);
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goto out;
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}
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err = shash_async_init(req);
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if (err)
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goto out;
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err = shash_async_update(req);
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if (err)
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goto out;
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err = shash_async_final(req);
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out:
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return err;
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}
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static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
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{
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
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crypto_free_shash(*ctx);
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}
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static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
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{
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struct crypto_alg *calg = tfm->__crt_alg;
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struct shash_alg *alg = __crypto_shash_alg(calg);
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struct ahash_tfm *crt = &tfm->crt_ahash;
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
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struct crypto_shash *shash;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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shash = crypto_create_tfm(calg, &crypto_shash_type);
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if (IS_ERR(shash)) {
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crypto_mod_put(calg);
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return PTR_ERR(shash);
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}
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*ctx = shash;
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tfm->exit = crypto_exit_shash_ops_async;
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crt->init = shash_async_init;
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crt->update = shash_async_update;
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crt->final = shash_async_final;
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crt->digest = shash_async_digest;
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crt->setkey = shash_async_setkey;
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crt->digestsize = alg->digestsize;
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crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
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return 0;
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}
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static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_desc *desc = crypto_hash_ctx(tfm);
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return crypto_shash_setkey(desc->tfm, key, keylen);
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}
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static int shash_compat_init(struct hash_desc *hdesc)
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{
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struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
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desc->flags = hdesc->flags;
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return crypto_shash_init(desc);
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}
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static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
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unsigned int len)
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{
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struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
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struct crypto_hash_walk walk;
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int nbytes;
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for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
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nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
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nbytes = crypto_shash_update(desc, walk.data, nbytes);
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return nbytes;
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}
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static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
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{
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return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
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}
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static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
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unsigned int nbytes, u8 *out)
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{
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unsigned int offset = sg->offset;
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int err;
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if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
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struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
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void *data;
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desc->flags = hdesc->flags;
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data = crypto_kmap(sg_page(sg), 0);
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err = crypto_shash_digest(desc, data + offset, nbytes, out);
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crypto_kunmap(data, 0);
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crypto_yield(desc->flags);
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goto out;
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}
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err = shash_compat_init(hdesc);
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if (err)
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goto out;
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err = shash_compat_update(hdesc, sg, nbytes);
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if (err)
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goto out;
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err = shash_compat_final(hdesc, out);
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out:
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return err;
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}
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static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
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{
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struct shash_desc *desc= crypto_tfm_ctx(tfm);
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crypto_free_shash(desc->tfm);
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}
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static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
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{
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struct hash_tfm *crt = &tfm->crt_hash;
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struct crypto_alg *calg = tfm->__crt_alg;
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struct shash_alg *alg = __crypto_shash_alg(calg);
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struct shash_desc *desc = crypto_tfm_ctx(tfm);
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struct crypto_shash *shash;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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shash = crypto_create_tfm(calg, &crypto_shash_type);
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if (IS_ERR(shash)) {
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crypto_mod_put(calg);
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return PTR_ERR(shash);
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}
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desc->tfm = shash;
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tfm->exit = crypto_exit_shash_ops_compat;
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crt->init = shash_compat_init;
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crt->update = shash_compat_update;
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crt->final = shash_compat_final;
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crt->digest = shash_compat_digest;
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crt->setkey = shash_compat_setkey;
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crt->digestsize = alg->digestsize;
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return 0;
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}
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static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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switch (mask & CRYPTO_ALG_TYPE_MASK) {
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case CRYPTO_ALG_TYPE_HASH_MASK:
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return crypto_init_shash_ops_compat(tfm);
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case CRYPTO_ALG_TYPE_AHASH_MASK:
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return crypto_init_shash_ops_async(tfm);
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}
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return -EINVAL;
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}
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static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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struct shash_alg *salg = __crypto_shash_alg(alg);
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switch (mask & CRYPTO_ALG_TYPE_MASK) {
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case CRYPTO_ALG_TYPE_HASH_MASK:
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return sizeof(struct shash_desc) + salg->descsize;
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case CRYPTO_ALG_TYPE_AHASH_MASK:
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return sizeof(struct crypto_shash *);
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}
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return 0;
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}
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static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
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const struct crypto_type *frontend)
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{
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return 0;
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}
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static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
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const struct crypto_type *frontend)
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{
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return alg->cra_ctxsize;
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}
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static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct shash_alg *salg = __crypto_shash_alg(alg);
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seq_printf(m, "type : shash\n");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "digestsize : %u\n", salg->digestsize);
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seq_printf(m, "descsize : %u\n", salg->descsize);
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}
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static const struct crypto_type crypto_shash_type = {
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.ctxsize = crypto_shash_ctxsize,
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.extsize = crypto_shash_extsize,
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.init = crypto_init_shash_ops,
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.init_tfm = crypto_shash_init_tfm,
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#ifdef CONFIG_PROC_FS
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.show = crypto_shash_show,
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#endif
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_SHASH,
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.tfmsize = offsetof(struct crypto_shash, base),
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};
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struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
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u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_shash);
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int crypto_register_shash(struct shash_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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if (alg->digestsize > PAGE_SIZE / 8 ||
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alg->descsize > PAGE_SIZE / 8)
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return -EINVAL;
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base->cra_type = &crypto_shash_type;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
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return crypto_register_alg(base);
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}
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EXPORT_SYMBOL_GPL(crypto_register_shash);
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int crypto_unregister_shash(struct shash_alg *alg)
|
|
{
|
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return crypto_unregister_alg(&alg->base);
|
|
}
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EXPORT_SYMBOL_GPL(crypto_unregister_shash);
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|
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Synchronous cryptographic hash type");
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