Re: [PATCH 2/2] userns,pidns: Force thread group sharing, not signal handler sharing

From: Oleg Nesterov
Date: Wed Aug 12 2015 - 13:26:40 EST

On 08/11, Eric W. Biederman wrote:
> The code that places signals in signal queues computes the uids, gids,
> and pids at the time the signals are enqueued. Which means that tasks
> that share signal queues must be in the same pid and user namespaces.
> Sharing signal handlers is fine, but bizarre.
> So make the code in fork and userns_install clearer by only testing
> for what is functionally necessary.
> Also update the comment in unshare about unsharing a user namespace to
> be a little more explicit and make a little more sense.
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>

Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>

But: Eric, Andrew, this means that


in -mm tree should be dropped.


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