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    SubjectRe: [PATCH 03/10] ptrace: implement PTRACE_SEIZE
    On 05/19, Tejun Heo wrote:
    >
    > Hello,
    >
    > On Wed, May 18, 2011 at 11:55:39AM +0200, Tejun Heo wrote:
    > > I've been thinking about Jan's suggestion to make ATTACH and DETACH
    > > not require tracee to trap. We already have this for DETACH for cases
    > > where the tracer is killed and it seems it wouldn't be too difficult
    > > to make that happen for ATTACH either and for that to be truly useful
    > > I suppose PTRACE_SETOPTIONS shouldn't require trapped state either.
    > > Jan, would that be enough for the use cases you have on mind?
    >
    > I've been trying this and clean DETACH requires the tracee to be
    > trapped (or not running). The arch detach hook, which BTW is not
    > executed when the tracer is killed, modifies tracee state expecting it
    > to be off-cpu.

    Argh. Yes, ptrace_disable() is the problem, I didn't think about it :/

    Oleg.



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