crypto: skcipher - Use eseqiv even on UP machines

Previously we would use eseqiv on all async ciphers in all cases,
and sync ciphers if we have more than one CPU.  This meant that
chainiv is only used in the case of sync ciphers on a UP machine.

As chainiv may aid attackers by making the IV predictable, even
though this risk itself is small, the above usage pattern causes
it to further leak information about the host.

This patch addresses these issues by using eseqiv even if we're
on a UP machine.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: David S. Miller <davem@davemloft.net>

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 7d4a8d28277e181386981dcef2d73ec377aefe9a..40886c489903b72a50c1b718869c38744d142aa4 100644 (file)
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -16,9 +16,7 @@
 #include <crypto/internal/skcipher.h>
 #include <linux/cpumask.h>
 #include <linux/err.h>
-#include <linux/init.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/rtnetlink.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
@@ -30,8 +28,6 @@
 
 #include "internal.h"
 
-static const char *skcipher_default_geniv __read_mostly;
-
 struct ablkcipher_buffer {
        struct list_head        entry;
        struct scatter_walk     dst;
@@ -527,8 +523,7 @@ const char *crypto_default_geniv(const struct crypto_alg *alg)
            alg->cra_blocksize)
                return "chainiv";
 
-       return alg->cra_flags & CRYPTO_ALG_ASYNC ?
-              "eseqiv" : skcipher_default_geniv;
+       return "eseqiv";
 }
 
 static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
@@ -709,17 +704,3 @@ err:
        return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
-
-static int __init skcipher_module_init(void)
-{
-       skcipher_default_geniv = num_possible_cpus() > 1 ?
-                                "eseqiv" : "chainiv";
-       return 0;
-}
-
-static void skcipher_module_exit(void)
-{
-}
-
-module_init(skcipher_module_init);
-module_exit(skcipher_module_exit);