From 1dfd1711de2952fd1bfeea7152bd1687a4eea771 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 15 May 2019 12:23:03 -0500 Subject: [PATCH] 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 Cc: David S. Miller Fixes: d2ba09c17a06 ("net: add skeleton of bpfilter kernel module") Signed-off-by: "Eric W. Biederman" --- net/bpfilter/bpfilter_kern.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index 7ee4fea93637..c0f0990f30b6 100644 --- 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); } }