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Revert "genetlink: disallow subscribing to unknown mcast groups"

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Commit 5ad6300524 ("genetlink: disallow subscribing to unknown
mcast groups") disallows userspace to subscribe to groups that don't
exist in kernel. As a result, communication between processes is
not possible unless they explicitly register a dummy group with the
kernel even if the communication is between userspace processes
only. NETLINK_USERSOCK cannot be used here since userspace processes
would require CAP_NET_ADMIN to receive multicast messages which
is available for priveleged processes only.

Fix this problem by reverting the change till a solution is
determined internally and upstream discussion.

CRs-Fixed: 2086060
Change-Id: Id559d9ef9d1e0a25e3bbdc81503978f01c6ed85f
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
This commit is contained in:
Subash Abhinov Kasiviswanathan 2017-11-01 15:35:37 -06:00 committed by Gerrit - the friendly Code Review server
parent 22ea315950
commit 047570fa7c
1 changed files with 1 additions and 1 deletions
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2
net/netlink/genetlink.c
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@ -963,7 +963,7 @@ static struct genl_family genl_ctrl __ro_after_init = {
static int genl_bind(struct net *net, int group)
{
struct genl_family *f;
int err = -ENOENT;
int err = 0;
unsigned int id;
down_read(&cb_lock);