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 <ast@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Fixes: d2ba09c17a06 ("net: add skeleton of bpfilter kernel module")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 7ee4fea93637534a0aa97f95eee3d00270b7044e..c0f0990f30b60415fa6b929415f5ac67bba4ed01 100644 (file)
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -22,7 +22,7 @@ static void shutdown_umh(void)
 
        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);
        }
 }