Date: Tue, 24 Jul 2007 15:51:57 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Victor Loureiro Lima <victorloureirolima@gmail.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, Daniel Molina Wegener <dmw@unete.cl> Subject: Re: A few questions... Message-ID: <20070724225157.GI99491@funkthat.com> In-Reply-To: <ac00e00a0707241235u4058e2a4ybe50e7843e1d1bb9@mail.gmail.com> References: <200707232052.58485.dmw@unete.cl> <20070724184355.GH99491@funkthat.com> <ac00e00a0707241235u4058e2a4ybe50e7843e1d1bb9@mail.gmail.com>
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Victor Loureiro Lima wrote this message on Tue, Jul 24, 2007 at 16:35 -0300:
> 2007/7/24, John-Mark Gurney <gurney_j@resnet.uoregon.edu>:
> >Daniel Molina Wegener wrote this message on Mon, Jul 23, 2007 at 20:52
> >-0400:
> >> a) Is there any function or variable that tells me which is the
> >> root user UID in the system, or root always have 0 and it's
> >> an "elegant" option to compare the variables or structure
> >> members against zero.
> >
> >#include <sys/conf.h>
> >
> >uid == UID_ROOT
> >
> >> b) Can normal users look for system processes or kernel threads?
> >
> >Yes, ps does this...
> >
>
> ps(1) either elevates its priviledges during execution, or has some
> other way of medling into the afairs of other processes that will
> eventually need some higher priviledge status (either that, or I am
> really out-dated on modern operational systems)
hydrogen,ttypm,/home/johng,503$ls -l /bin/ps
-r-xr-xr-x 1 root wheel 31372 May 8 2005 /bin/ps*
So, as you see, no suid or sgid necessary for ps to function...
FreeBSD exports most/all of the info through sysctl which does not
require elevated privs to get...
And ps doesn't medling.. it's just a voyeur..
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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