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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-15 22:44:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-15 22:44:02 +0300
commit52f6c588c77b76d548201470c2a28263a41b462b (patch)
treecbb4207714e82f10932a546469bfb3db84051c33 /net
parent78dcf73421a879d22319d3889119945b85954a68 (diff)
parent72e5c740f6335e27253b8ff64d23d00337091535 (diff)
downloadlinux-52f6c588c77b76d548201470c2a28263a41b462b.tar.xz
Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
Pull random updates from Ted Ts'o: "Add wait_for_random_bytes() and get_random_*_wait() functions so that callers can more safely get random bytes if they can block until the CRNG is initialized. Also print a warning if get_random_*() is called before the CRNG is initialized. By default, only one single-line warning will be printed per boot. If CONFIG_WARN_ALL_UNSEEDED_RANDOM is defined, then a warning will be printed for each function which tries to get random bytes before the CRNG is initialized. This can get spammy for certain architecture types, so it is not enabled by default" * tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random: random: reorder READ_ONCE() in get_random_uXX random: suppress spammy warnings about unseeded randomness random: warn when kernel uses unseeded randomness net/route: use get_random_int for random counter net/neighbor: use get_random_u32 for 32-bit hash random rhashtable: use get_random_u32 for hash_rnd ceph: ensure RNG is seeded before using iscsi: ensure RNG is seeded before use cifs: use get_random_u32 for 32-bit lock random random: add get_random_{bytes,u32,u64,int,long,once}_wait family random: add wait_for_random_bytes() API
Diffstat (limited to 'net')
-rw-r--r--net/ceph/ceph_common.c6
-rw-r--r--net/core/neighbour.c3
-rw-r--r--net/ipv4/route.c3
3 files changed, 7 insertions, 5 deletions
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 3d265c5cb6d0..5c036d2f401e 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -599,7 +599,11 @@ 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)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index e31fc11a8000..d0713627deb6 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -347,8 +347,7 @@ out_entries:
static void neigh_get_hash_rnd(u32 *x)
{
- get_random_bytes(x, sizeof(*x));
- *x |= 1;
+ *x = get_random_u32() | 1;
}
static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c816cd53f7fc..0383e66f59bc 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2979,8 +2979,7 @@ static __net_init int rt_genid_init(struct net *net)
{
atomic_set(&net->ipv4.rt_genid, 0);
atomic_set(&net->fnhe_genid, 0);
- get_random_bytes(&net->ipv4.dev_addr_genid,
- sizeof(net->ipv4.dev_addr_genid));
+ atomic_set(&net->ipv4.dev_addr_genid, get_random_int());
return 0;
}