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[CRYPTO] Ensure cit_iv is aligned correctly

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This patch ensures that cit_iv is aligned according to cra_alignmask
by allocating it as part of the tfm structure.  As a side effect the
crypto layer will also guarantee that the tfm ctx area has enough space
to be aligned by cra_alignmask.  This allows us to remove the extra
space reservation from the Padlock driver.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-07-06 13:53:29 -07:00 • committed by David S. Miller
parent 176c3652c5
commit fbdae9f3e7
5 changed files with 72 additions and 11 deletions
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15
crypto/cipher.c
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@ -41,7 +41,7 @@ static unsigned int crypt_slow(const struct cipher_desc *desc,
struct scatter_walk *in,
struct scatter_walk *out, unsigned int bsize)
{
unsigned int alignmask = desc->tfm->__crt_alg->cra_alignmask;
unsigned int alignmask = crypto_tfm_alg_alignmask(desc->tfm);
u8 buffer[bsize * 2 + alignmask];
u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
u8 *dst = src + bsize;
@ -98,7 +98,7 @@ static int crypt(const struct cipher_desc *desc,
struct scatter_walk walk_in, walk_out;
struct crypto_tfm *tfm = desc->tfm;
const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
unsigned int alignmask = tfm->__crt_alg->cra_alignmask;
unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
unsigned long buffer = 0;
if (!nbytes)
@ -399,6 +399,8 @@ int crypto_init_cipher_ops(struct crypto_tfm *tfm)
}
if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) {
unsigned int align;
unsigned long addr;
switch (crypto_tfm_alg_blocksize(tfm)) {
case 8:
@ -418,9 +420,11 @@ int crypto_init_cipher_ops(struct crypto_tfm *tfm)
}
ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm);
ops->cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL);
if (ops->cit_iv == NULL)
ret = -ENOMEM;
align = crypto_tfm_alg_alignmask(tfm) + 1;
addr = (unsigned long)crypto_tfm_ctx(tfm);
addr = ALIGN(addr, align);
addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
ops->cit_iv = (void *)addr;
}
out:
@ -429,5 +433,4 @@ out:
void crypto_exit_cipher_ops(struct crypto_tfm *tfm)
{
kfree(tfm->crt_cipher.cit_iv);
}