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SubjectRe: [PATCH v1 1/1] waitid: Add support for waiting for the current process group
On 08/14, christian.brauner@ubuntu.com wrote:
>
> case P_PGID:
> type = PIDTYPE_PGID;
> - if (upid <= 0)
> + if (upid < 0)
> return -EINVAL;
> +
> + if (upid == 0)
> + pid = get_pid(task_pgrp(current));

this needs rcu lock or tasklist_lock, this can race with another thread
doing sys_setpgid/setsid (see change_pid(PIDTYPE_PGID)).

Oleg.

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