UBUNTU: SAUCE: RDMA/ucm: Blacklist UCM module

BugLink: https://bugs.launchpad.net/bugs/1790620

commit 7a8690ed upstream
did deprecate the module by making it depend on BROKEN
(config setting).
We cannot simply drop it as part of an SRU. Instead lets
put it into the default blacklist and print a big warning
should someone force load it.
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

debian.master/modprobe.d/common.conf

 # LP:1434842 -- disable OSS drivers by default to allow pulseaudio to emulate
 blacklist snd-mixer-oss
 blacklist snd-pcm-oss
+# The Infiniband Connection Manager module was marked broken in 4.4.141
+# (LP: #1790620). Instead of that we blacklist by default.
+blacklist ib_ucm

drivers/infiniband/core/ucm.c

@@ -1348,6 +1348,11 @@ static int __init ib_ucm_init(void)
 		printk(KERN_ERR "ucm: couldn't register client\n");
 		goto error3;
 	}
+
+	printk(KERN_ERR "ucm: This module is DEPRECATED and can expose your\n");
+	printk(KERN_ERR "ucm: system to attacks! Use at your own risk!!!\n");
+	add_taint(TAINT_FORCED_MODULE, LOCKDEP_STILL_OK);
+
 	return 0;
 
 error3: