They don't take signals individually, and even if they share signals with the parent task, don't allow them to be delivered through the worker thread. Reported-by: Stefan Metzmacher <metze@xxxxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> --- kernel/signal.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/signal.c b/kernel/signal.c index ba4d1ef39a9e..730ecd3d6faf 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -833,6 +833,9 @@ static int check_kill_permission(int sig, struct kernel_siginfo *info, if (!valid_signal(sig)) return -EINVAL; + /* PF_IO_WORKER threads don't take any signals */ + if (t->flags & PF_IO_WORKER) + return -EPERM; if (!si_fromuser(info)) return 0; -- 2.31.0
