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crypto: eseqiv - Offer normal cipher functionality without RNG 

The RNG may not be available during early boot, e.g., the relevant
modules may not be included in the initramfs.  As the RNG Is only
needed for IPsec, we should not let this prevent use of ciphers
without IV generators, e.g., for disk encryption.

This patch postpones the RNG allocation to the init function so
that one failure during early boot does not make the RNG unavailable
for all subsequent users of the same cipher.

More importantly, it lets the cipher live even if RNG allocation
fails.  Of course we no longer offer IV generation and which will
fail with an error if invoked.  But all other cipher capabilities
will function as usual.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-06-21 19:11:47 +08:00
parent 341476d6cf
commit 055906d1e7
1 changed files with 12 additions and 19 deletions
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31
crypto/eseqiv.c
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@ -152,6 +152,7 @@ static int eseqiv_init(struct crypto_tfm *tfm)
struct eseqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
unsigned long alignmask;
unsigned int reqsize;
int err;
spin_lock_init(&ctx->lock);
@ -175,9 +176,15 @@ static int eseqiv_init(struct crypto_tfm *tfm)
tfm->crt_ablkcipher.reqsize = reqsize +
sizeof(struct ablkcipher_request);
return crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_ablkcipher_ivsize(geniv)) ?:
skcipher_geniv_init(tfm);
err = 0;
if (!crypto_get_default_rng()) {
crypto_ablkcipher_crt(geniv)->givencrypt = eseqiv_givencrypt;
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_ablkcipher_ivsize(geniv));
crypto_put_default_rng();
}
return err ?: skcipher_geniv_init(tfm);
}
static struct crypto_template eseqiv_tmpl;
@ -187,20 +194,14 @@ static struct crypto_instance *eseqiv_alloc(struct rtattr **tb)
struct crypto_instance *inst;
int err;
err = crypto_get_default_rng();
if (err)
return ERR_PTR(err);
inst = skcipher_geniv_alloc(&eseqiv_tmpl, tb, 0, 0);
if (IS_ERR(inst))
goto put_rng;
goto out;
err = -EINVAL;
if (inst->alg.cra_ablkcipher.ivsize != inst->alg.cra_blocksize)
goto free_inst;
inst->alg.cra_ablkcipher.givencrypt = eseqiv_givencrypt;
inst->alg.cra_init = eseqiv_init;
inst->alg.cra_exit = skcipher_geniv_exit;
@ -213,21 +214,13 @@ static struct crypto_instance *eseqiv_alloc(struct rtattr **tb)
free_inst:
skcipher_geniv_free(inst);
inst = ERR_PTR(err);
put_rng:
crypto_put_default_rng();
goto out;
}
static void eseqiv_free(struct crypto_instance *inst)
{
skcipher_geniv_free(inst);
crypto_put_default_rng();
}
static struct crypto_template eseqiv_tmpl = {
.name = "eseqiv",
.alloc = eseqiv_alloc,
.free = eseqiv_free,
.free = skcipher_geniv_free,
.module = THIS_MODULE,
};