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ceph: ensure RNG is seeded before using

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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@zx2c4.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: "Yan, Zheng" <zyan@redhat.com>
Cc: Sage Weil <sage@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jason A. Donenfeld 2017-06-07 22:44:54 -04:00 committed by Theodore Ts'o
parent 6787ab81b2
commit ae5b806a3d
1 changed files with 5 additions and 1 deletions
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6
net/ceph/ceph_common.c
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@ -611,7 +611,11 @@ struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
{ {
struct ceph_client *client; struct ceph_client *client;
struct ceph_entity_addr *myaddr = NULL; 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); client = kzalloc(sizeof(*client), GFP_KERNEL);
if (client == NULL) if (client == NULL)