[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 <[email protected]>
mna · Oct 30, 2005 · 1b40efd · 1b40efd
1 parent 6df5b9f
commit 1b40efd
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/crypto/api.c b/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);