[PATCH 4/7][v7] Protect cinit from unblocked SIG_DFL signals

[Oleg Nesterov]

On 01/17, Sukadev Bhattiprolu wrote:
>
> @@ -1331,7 +1341,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
>  		goto ret;
>
>  	ret = 1; /* the signal is ignored */
> -	if (!prepare_signal(sig, t))
> +	if (!prepare_signal(sig, t, 1))

Hmm, just noticed. This looks wrong, it should be prepare_signal(sig, t, 0),
no?

For example, /sbin/init can create the posix timer with sigev_signo = SIGKILL
and it won't be killed before this patch.

This also looks wrong from the masquerading pov.


Otherwise, the patches 1-6 are imho fine.

Oleg.