Disable tracing on FreeBSD using procctl. (OpenSSH Portable 8.8)

Darren Tucker dtucker at dtucker.net
Fri Oct 15 13:32:07 AEDT 2021

On Fri, 15 Oct 2021 at 13:15, mike tancsa <mike at sentex.net> wrote:
> OK, I think its related to these settings. On my RELENG_13 box, if I set
> these vals, the sftp fails
> sftp-server[22121]: fatal: unable to make the process untraceable: No
> such process
>   sysctl -w security.bsd.see_other_uids=0
> sysctl -w security.bsd.see_other_gids=0

The call is:
    procctl(P_PID, 0, PROC_TRACE_CTL, &disable_trace)

The second argument is PID, presumably pid 0 is an alias for its own
pid although the man page does not mention this.  Does it work if you
replace the 0 with getpid() ?

Darren Tucker (dtucker at dtucker.net)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA (new)
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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