[lkml]   [2004]   [Sep]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: /proc/sys/kernel/pid_max issues

    * Albert Cahalan <> wrote:

    > > > I'd much prefer LRU allocation. There are
    > > > lots of system calls that take PID values.
    > > > All such calls are hazardous. They're pretty
    > > > much broken by design.
    > >
    > > this is a pretty sweeping assertion. Would you
    > > care to mention a few examples of such hazards?
    > kill(12345,9)
    > setpriority(PRIO_PROCESS,12345,-20)
    > sched_setscheduler(12345, SCHED_FIFO, &sp)
    > Prior to the call being handled, the process may
    > die and be replaced. Some random innocent process,
    > or a not-so-innocent one, will get acted upon by
    > mistake. This is broken and dangerous.

    easy to fix: SIGSTOP the task, check it's really
    the one you want and then do the setpriority /
    setscheduler call and SIGCONT it. Any privileged
    code that is about to spread some of its privileges
    via asynchronous system-calls need to be careful.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 14:06    [W:0.029 / U:8.516 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site