issetugid() for other procs

[Zane C.B.]

On Sun, 7 Oct 2007 21:04:02 +0300
Kostik Belousov <kostikbel at gmail.com> wrote:

> On Sun, Oct 07, 2007 at 12:28:05PM -0500, Zane C.B. wrote:
> > On Sun, 07 Oct 2007 18:25:57 +0200
> > Jan M?nther <jan.muenther at nruns.com> wrote:
> > 
> > > man getuid, man geteuid.
> > 
> > This does work for other procs, only the one that is calling it.
> > 
> > Like I said initially I am looking to check if another proc has
> > run setuid, seteuid, or been executed or forked by one that has.
> 
> Note that what you trying to do is racy by definition.

Why is that? It seems like something that be useful instead of
something taboo. My interest in it is I am writing a database
connector interested in making it paranoid as possible.

> To get the value of issetugid() for some other process, as it
> _could_ be returned at some moment in a time, you shall check the
> P_SUGID bit of the p_flag from the corresponding struct proc. This
> is available by the kvm_getprocs(3) interface in the ki_flag field
> of the kinfo_proc structure, see corresponding man page.

Awesome, I will begin investigating this.