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[CRYPTO] Check cra_alignmask against cra_blocksize

The cipher code relies on the fact that the block size is a multiple
of the required alignment.  So we should check this at the time of
algorith registration.  We also ensure that the block size is bounded
by the page size.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Herbert Xu hace 20 años
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1b40efd772
Se han modificado 1 ficheros con 4 adiciones y 1 borrados
  1. 4 1
      crypto/api.c

+ 4 - 1
crypto/api.c

@@ -215,7 +215,10 @@ int crypto_register_alg(struct crypto_alg *alg)
 	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
 		return -EINVAL;
 
-	if (alg->cra_alignmask > PAGE_SIZE)
+	if (alg->cra_alignmask & alg->cra_blocksize)
+		return -EINVAL;
+
+	if (alg->cra_blocksize > PAGE_SIZE)
 		return -EINVAL;
 	
 	down_write(&crypto_alg_sem);