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    SubjectRe: [PATCH] user namespace: make signal.c respect user namespaces
    Quoting Oleg Nesterov (
    > On 09/23, Serge E. Hallyn wrote:
    > >
    > > It looks like I can fix all the
    > > cases
    > except ptrace_signal(). Although we can simply ignore this case, imho.

    ptrace_signal() calls send_signal() though.

    But oh, dear. It is sending a signal on behalf of the parent, so what I was
    about to send, which does the uid mapping at send_signal() using current_cred()
    as the id to send, is not correct.

    Which unfortunately means that I'll have to have the caller of send_signal
    (when doing SI_USER) either send the signal sender's cred, or do the
    mapping. Or special-case ptrace_signal(). This is not as pretty as I'd

    > > at send_signal()
    > Yes, I was thinking about this too but didn't have the time to check
    > if this can really work.
    > > by checking whether si_fromuser(info)
    > I am not sure... sys_rt_queueinfo() is nasty. Plus we have to handle
    > the "fromkernel" case too. May be we can ignore this too.

    sys_rt_tgsigqueueinfo() still seems to go through send_signal().


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