I wrote a kernel module that sends generic Netlink multicasts, and wrote a userland client using libmnl that receives them.
That all works fine, but my client works even when it's not the root user. man 7 netlink says: Only processes with an effective UID of 0 or the CAP_NET_ADMIN capability may send or listen to a netlink multicast group. The listen part of this is seemingly not true. I've tried this on kernels 3.13 (Ubuntu 14.04), 2.6.32 (CentOS 6) and 2.6.18 (CentOS 5). Is this a bug? If not: I know that restricting receiving generic netlink commands incoming to the kernel to being only from root is possible with GENL_ADMIN_PERM flag, but is it possible to send multicasts from the kernel that can only be received by root? Thank you -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
