linux-kernel - [PATCH RFC v2 8/8] ceph: ensure RNG is seeded before using

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Date:   Mon,  5 Jun 2017 05:47:57 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Theodore Ts'o <tytso@....edu>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-hardening@...ts.openwall.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Ilya Dryomov <idryomov@...il.com>,
        "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>
Subject: [PATCH RFC v2 8/8] ceph: ensure RNG is seeded before using

Ceph uses the RNG for various nonce generations, and it shouldn't accept
using bad randomness. So, we wait for the RNG to be properly seeded. We
do this by calling wait_for_random_bytes() in a function that is
certainly called in process context, early on, so that all subsequent
calls to get_random_bytes are necessarily acceptable.

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Cc: Ilya Dryomov <idryomov@...il.com>
Cc: "Yan, Zheng" <zyan@...hat.com>
Cc: Sage Weil <sage@...hat.com>
---
 net/ceph/ceph_common.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 4fd02831beed..26ab58665f77 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -611,7 +611,11 @@ struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
 {
 	struct ceph_client *client;
 	struct ceph_entity_addr *myaddr = NULL;
-	int err = -ENOMEM;
+	int err;
+
+	err = wait_for_random_bytes();
+	if (err < 0)
+		return ERR_PTR(err);
 
 	client = kzalloc(sizeof(*client), GFP_KERNEL);
 	if (client == NULL)
-- 
2.13.0