signal/bpfilter: Fix bpfilter_kernl to use send_sig not force_sig

The locking in force_sig_info is not prepared to deal with
a task that exits or execs (as sighand may change). As force_sig
is only built to handle synchronous exceptions.

Further the function force_sig_info changes the signal state if the
signal is ignored, or blocked or if SIGNAL_UNKILLABLE will prevent the
delivery of the signal. The signal SIGKILL can not be ignored and can
not be blocked and SIGNAL_UNKILLABLE won't prevent it from being
delivered.

So using force_sig rather than send_sig for SIGKILL is pointless.

Because it won't impact the sending of the signal and and because
using force_sig is wrong, replace force_sig with send_sig.

Cc: Alexei Starovoitov <[e-mail]>
Cc: David S. Miller <[e-mail]>
Fixes: d2ba09c17a06 ("net: add skeleton of bpfilter kernel module")
Signed-off-by: "Eric W. Biederman" <[e-mail]>

net/bpfilter/bpfilter_kern.c

···
 
 	tsk = get_pid_task(find_vpid(bpfilter_ops.info.pid), PIDTYPE_PID);
 	if (tsk) {
-		force_sig(SIGKILL, tsk);
+		send_sig(SIGKILL, tsk, 1);
 		put_task_struct(tsk);
 	}
 }