mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 07:07:34 +07:00
c4741b2305
Use subsys_initcall for registration of all templates and generic algorithm implementations, rather than module_init. Then change cryptomgr to use arch_initcall, to place it before the subsys_initcalls. This is needed so that when both a generic and optimized implementation of an algorithm are built into the kernel (not loadable modules), the generic implementation is registered before the optimized one. Otherwise, the self-tests for the optimized implementation are unable to allocate the generic implementation for the new comparison fuzz tests. Note that on arm, a side effect of this change is that self-tests for generic implementations may run before the unaligned access handler has been installed. So, unaligned accesses will crash the kernel. This is arguably a good thing as it makes it easier to detect that type of bug. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
228 lines
5.4 KiB
C
228 lines
5.4 KiB
C
/*
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* Cryptographic API.
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*
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* Null algorithms, aka Much Ado About Nothing.
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*
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* These are needed for IPsec, and may be useful in general for
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* testing & debugging.
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*
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* The null cipher is compliant with RFC2410.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <crypto/null.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
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static struct crypto_sync_skcipher *crypto_default_null_skcipher;
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static int crypto_default_null_skcipher_refcnt;
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static int null_compress(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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{
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if (slen > *dlen)
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return -EINVAL;
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memcpy(dst, src, slen);
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*dlen = slen;
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return 0;
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}
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static int null_init(struct shash_desc *desc)
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{
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return 0;
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}
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static int null_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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return 0;
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}
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static int null_final(struct shash_desc *desc, u8 *out)
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{
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return 0;
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}
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static int null_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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return 0;
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}
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static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{ return 0; }
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static int null_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen)
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{ return 0; }
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static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{ return 0; }
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static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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memcpy(dst, src, NULL_BLOCK_SIZE);
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}
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static int null_skcipher_crypt(struct skcipher_request *req)
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{
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes) {
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if (walk.src.virt.addr != walk.dst.virt.addr)
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memcpy(walk.dst.virt.addr, walk.src.virt.addr,
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walk.nbytes);
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err = skcipher_walk_done(&walk, 0);
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}
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return err;
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}
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static struct shash_alg digest_null = {
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.digestsize = NULL_DIGEST_SIZE,
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.setkey = null_hash_setkey,
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.init = null_init,
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.update = null_update,
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.finup = null_digest,
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.digest = null_digest,
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.final = null_final,
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.base = {
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.cra_name = "digest_null",
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static struct skcipher_alg skcipher_null = {
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.base.cra_name = "ecb(cipher_null)",
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.base.cra_driver_name = "ecb-cipher_null",
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.base.cra_priority = 100,
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.base.cra_blocksize = NULL_BLOCK_SIZE,
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.base.cra_ctxsize = 0,
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.base.cra_module = THIS_MODULE,
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.min_keysize = NULL_KEY_SIZE,
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.max_keysize = NULL_KEY_SIZE,
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.ivsize = NULL_IV_SIZE,
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.setkey = null_skcipher_setkey,
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.encrypt = null_skcipher_crypt,
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.decrypt = null_skcipher_crypt,
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};
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static struct crypto_alg null_algs[] = { {
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.cra_name = "cipher_null",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_u = { .cipher = {
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.cia_min_keysize = NULL_KEY_SIZE,
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.cia_max_keysize = NULL_KEY_SIZE,
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.cia_setkey = null_setkey,
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.cia_encrypt = null_crypt,
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.cia_decrypt = null_crypt } }
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}, {
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.cra_name = "compress_null",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_u = { .compress = {
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.coa_compress = null_compress,
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.coa_decompress = null_compress } }
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} };
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MODULE_ALIAS_CRYPTO("compress_null");
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MODULE_ALIAS_CRYPTO("digest_null");
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MODULE_ALIAS_CRYPTO("cipher_null");
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struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void)
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{
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struct crypto_sync_skcipher *tfm;
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mutex_lock(&crypto_default_null_skcipher_lock);
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tfm = crypto_default_null_skcipher;
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if (!tfm) {
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tfm = crypto_alloc_sync_skcipher("ecb(cipher_null)", 0, 0);
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if (IS_ERR(tfm))
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goto unlock;
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crypto_default_null_skcipher = tfm;
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}
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crypto_default_null_skcipher_refcnt++;
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unlock:
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mutex_unlock(&crypto_default_null_skcipher_lock);
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return tfm;
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}
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EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher);
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void crypto_put_default_null_skcipher(void)
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{
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mutex_lock(&crypto_default_null_skcipher_lock);
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if (!--crypto_default_null_skcipher_refcnt) {
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crypto_free_sync_skcipher(crypto_default_null_skcipher);
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crypto_default_null_skcipher = NULL;
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}
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mutex_unlock(&crypto_default_null_skcipher_lock);
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}
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EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
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static int __init crypto_null_mod_init(void)
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{
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int ret = 0;
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ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs));
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if (ret < 0)
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goto out;
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ret = crypto_register_shash(&digest_null);
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if (ret < 0)
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goto out_unregister_algs;
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ret = crypto_register_skcipher(&skcipher_null);
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if (ret < 0)
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goto out_unregister_shash;
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return 0;
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out_unregister_shash:
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crypto_unregister_shash(&digest_null);
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out_unregister_algs:
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crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
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out:
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return ret;
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}
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static void __exit crypto_null_mod_fini(void)
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{
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crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
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crypto_unregister_shash(&digest_null);
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crypto_unregister_skcipher(&skcipher_null);
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}
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subsys_initcall(crypto_null_mod_init);
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module_exit(crypto_null_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Null Cryptographic Algorithms");
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