af_netlink: Fix shift out of bounds in group mask calculation

In the Linux kernel, the following vulnerability has been resolved:

af_netlink: Fix shift out of bounds in group mask calculation

When a netlink message is received, netlink_recvmsg() fills in the address

of the sender. One of the fields is the 32-bit bitfield nl_groups, which

carries the multicast group on which the message was received. The least

significant bit corresponds to group 1, and therefore the highest group

that the field can represent is 32. Above that, the UB sanitizer flags the

out-of-bounds shift attempts.

Which bits end up being set in such case is implementation defined, but

it's either going to be a wrong non-zero value, or zero, which is at least

not misleading. Make the latter choice deterministic by always setting to 0

for higher-numbered multicast groups.

To get information about membership in groups >= 32, userspace is expected

to use nl_pktinfo control messages[0], which are enabled by NETLINK_PKTINFO

socket option.

[0] https://lwn.net/Articles/147608/

The way to trigger this issue is e.g. through monitoring the BRVLAN group:

# bridge monitor vlan &

# ip link add name br type bridge

Which produces the following citation:

UBSAN: shift-out-of-bounds in net/netlink/af_netlink.c:162:19

shift exponent 32 is too large for 32-bit type 'int'