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    SubjectRe: [RESEND PATCH] pid_ns: Fix proc_flush_task() accessing freed proc_mnt
    Louis Rilling [Louis.Rilling@kerlabs.com] wrote:
    | - proc_pid_readdir():
    | Needs similar check and protection to proc_pid_lookup(), but there is another
    | issue: next_tgid() can find a dying task:

    Hmm, I thought proc_pid_readdir() would be a problem too but convinced myself
    that it would not - since a process running proc_pid_readdir() would have
    a reference to the pid namespace, in which case destroy_pid_ns() would not
    be called.
    |
    | next_tgid() finds a task
    | task dies
    | last reference to ns is dropped
    | destroy_pid_namespace()

    caller of next_tgid() holds a ref to pid-ns right ?

    Sukadev


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