| Message ID | 20170606174804.31124-12-Jason@zx2c4.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Herbert Xu |
| Headers | show |
On Tue, Jun 06, 2017 at 07:48:02PM +0200, Jason A. Donenfeld wrote: > Using get_random_int here is faster, more fitting of the use case, and > just as cryptographically secure. It also has the benefit of providing > better randomness at early boot, which is when many of these structures > are assigned. > > Also, semantically, it's not really proper to have been assigning an > atomic_t in this way before, even if in practice it works fine. > > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> > Cc: David Miller <davem@davemloft.net> Applied to the dev branch of the random.git branch, thanks. - Ted
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 655d9eebe43e..11e001a42094 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2936,8 +2936,7 @@ 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; }
Using get_random_int here is faster, more fitting of the use case, and just as cryptographically secure. It also has the benefit of providing better randomness at early boot, which is when many of these structures are assigned. Also, semantically, it's not really proper to have been assigning an atomic_t in this way before, even if in practice it works fine. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Cc: David Miller <davem@davemloft.net> --- net/ipv4/route.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)