Re: siginfo pid not populated from ptrace?
From: Oleg Nesterov
Date: Mon Dec 10 2018 - 10:37:22 EST
On 12/06, Eric W. Biederman wrote:
> The challenge is that we could be delivering this to a zombie signal
> group leader.
> Sigh it is probably time that I dig in and figure out how to avoid that
> case which we need to fix anyway because we can get the permission
> checks wrong for multi-threaded processes that call setuid and friends.
this is another issue... I am sure we have already discussed this, but I
failed to find any link to the previous discussion.
> Once that is sorted your small change will at least be safe.
I don't think so, any sub-thread can dequeue SIGSTOP unless type == PIDTYPE_PID,
this has nothing to do with the problems connected to zombie leader, or I