![Kees Cook](/assets/img/avatar_default.png)
This adds the module loading prefix "crypto-" to the template lookup as well. For example, attempting to load 'vfat(blowfish)' via AF_ALG now correctly includes the "crypto-" prefix at every level, correctly rejecting "vfat": net-pf-38 algif-hash crypto-vfat(blowfish) crypto-vfat(blowfish)-all crypto-vfat Reported-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
165 lines
4.4 KiB
C
165 lines
4.4 KiB
C
/*
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* FPU: Wrapper for blkcipher touching fpu
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*
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* Copyright (c) Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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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/algapi.h>
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#include <linux/err.h>
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#include <linux/init.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/crypto.h>
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#include <asm/i387.h>
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struct crypto_fpu_ctx {
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struct crypto_blkcipher *child;
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};
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static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_blkcipher *child = ctx->child;
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int err;
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crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_blkcipher_setkey(child, key, keylen);
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crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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int err;
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struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
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struct crypto_blkcipher *child = ctx->child;
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struct blkcipher_desc desc = {
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.tfm = child,
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.info = desc_in->info,
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.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
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};
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kernel_fpu_begin();
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err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);
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kernel_fpu_end();
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return err;
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}
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static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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int err;
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struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
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struct crypto_blkcipher *child = ctx->child;
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struct blkcipher_desc desc = {
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.tfm = child,
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.info = desc_in->info,
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.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
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};
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kernel_fpu_begin();
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err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);
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kernel_fpu_end();
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return err;
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}
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static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct crypto_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_blkcipher *cipher;
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cipher = crypto_spawn_blkcipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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return 0;
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}
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static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_blkcipher(ctx->child);
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}
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static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
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if (err)
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return ERR_PTR(err);
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alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
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CRYPTO_ALG_TYPE_MASK);
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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inst = crypto_alloc_instance("fpu", alg);
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if (IS_ERR(inst))
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goto out_put_alg;
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inst->alg.cra_flags = alg->cra_flags;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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inst->alg.cra_type = alg->cra_type;
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inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize;
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inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
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inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
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inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx);
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inst->alg.cra_init = crypto_fpu_init_tfm;
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inst->alg.cra_exit = crypto_fpu_exit_tfm;
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inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey;
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inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt;
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inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt;
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out_put_alg:
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crypto_mod_put(alg);
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return inst;
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}
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static void crypto_fpu_free(struct crypto_instance *inst)
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{
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crypto_drop_spawn(crypto_instance_ctx(inst));
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kfree(inst);
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}
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static struct crypto_template crypto_fpu_tmpl = {
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.name = "fpu",
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.alloc = crypto_fpu_alloc,
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.free = crypto_fpu_free,
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.module = THIS_MODULE,
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};
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int __init crypto_fpu_init(void)
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{
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return crypto_register_template(&crypto_fpu_tmpl);
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}
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void __exit crypto_fpu_exit(void)
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{
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crypto_unregister_template(&crypto_fpu_tmpl);
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}
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MODULE_ALIAS_CRYPTO("fpu");
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