Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 50ed2064 authored by Subash Abhinov Kasiviswanathan's avatar Subash Abhinov Kasiviswanathan
Browse files

Revert "genetlink: disallow subscribing to unknown mcast groups" 



Commit 5ad63005 ("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: 1078373
Change-Id: Id559d9ef9d1e0a25e3bbdc81503978f01c6ed85f
Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
parent 2139ce8a

net/netlink/genetlink.c

+1 −1
Original line number Diff line number Diff line
@@ -992,7 +992,7 @@ static const struct genl_multicast_group genl_ctrl_groups[] = { 


static int genl_bind(struct net *net, int group)

{

	int i, err = -ENOENT;

	int i, err = 0;



	down_read(&cb_lock);

	for (i = 0; i < GENL_FAM_TAB_SIZE; i++) {