crypto: user - Fix size of netlink dump message

The default netlink message size limit might be exceeded when dumping a
lot of algorithms to userspace. As a result, not all of the instantiated
algorithms dumped to userspace. So calculate an upper bound on the message
size and call netlink_dump_start() with that value.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index e91c161..f1ea0a0 100644 (file)
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -457,12 +457,20 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
        if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
            (nlh->nlmsg_flags & NLM_F_DUMP))) {
+               struct crypto_alg *alg;
+               u16 dump_alloc = 0;
+
                if (link->dump == NULL)
                        return -EINVAL;
+
+               list_for_each_entry(alg, &crypto_alg_list, cra_list)
+                       dump_alloc += CRYPTO_REPORT_MAXSIZE;
+
                {
                        struct netlink_dump_control c = {
                                .dump = link->dump,
                                .done = link->done,
+                               .min_dump_alloc = dump_alloc,
                        };
                        return netlink_dump_start(crypto_nlsk, skb, nlh, &c);
                }

diff --git a/include/linux/cryptouser.h b/include/linux/cryptouser.h
index 532fb58..4abf2ea 100644 (file)
--- a/include/linux/cryptouser.h
+++ b/include/linux/cryptouser.h
@@ -100,3 +100,6 @@ struct crypto_report_rng {
        char type[CRYPTO_MAX_NAME];
        unsigned int seedsize;
 };
+
+#define CRYPTO_REPORT_MAXSIZE (sizeof(struct crypto_user_alg) + \
+                              sizeof(struct crypto_report_blkcipher))