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Subject: Re: Core Dump as an Intrusion Event
From: Gigi Sullivan (sullivanSIKUREZZA.ORG)
Date: Mon Oct 09 2000 - 14:44:13 CDT

Aiee :)

   Hello!

On Sun, Oct 08, 2000 at 10:41:05PM +0300, Jarno Huuskonen wrote:
> On Sun, Oct 08, antirez wrote:
> > This is an example:
> >
> > --- /usr/src/linux/kernel/signal.c Sat Oct 7 23:35:17 2000
> > +++ /usr/src/linux-2/kernel/signal.c Sat Oct 7 23:44:25 2000
> > -282,6 +282,10
> > goto out_nolock;
> > }
> >
> > + if (sig == SIGSEGV)
> > + printk(KERN_NOTICE "%s(pid:%d) segmentation fault\n",
> > + current->comm, current->pid);
> > +
> > switch (sig) {
> > case SIGKILL: case SIGCONT:
> > /* Wake up the process if stopped. */
> >

[snip]

> What about adding some code so it can be controlled thru the proc filesystem ?
> Like enabling/disabling logging, log only certain programs etc.
> (echo 1 > /proc/sys/kernel/core-logging)
> Does this sound feasible/sensible ?

   This should be usefull, but making this feature sysctl tunable, may
   allow some malicious attacker to turn off this easly.

   Ok, if you're root, you can do anything you want, but remember that
   being root is really different from owning the kernel.

   Someone could argue that whenever root is owned, log could be altered.
   This is true and false ;) IMHO. Think about external logging peripherics,
   secure syslog implementation (CORE SDI one), tripwire or something else ...

   So, /proc (sysctl) tunable option could be *really* usefull, but
   hard coded statements are safer, IMHO (even if more restrictive).

   Nevertheless to say that we could think about a `secure' sysctl tuning
   mechanims.

>
> -Jarno
>
> --
> Jarno Huuskonen - System Administrator | Jarno.Huuskonenuku.fi
> University of Kuopio - Computer Centre | Work: +358 17 162822
> PO BOX 1627, 70211 Kuopio, Finland | Mobile: +358 40 5388169

bye bye

                     -- gg sullivan 

--
Lorenzo Cavallaro	`Gigi Sullivan' <sullivansikurezza.org>

LibRNet Project Home Page: http://www.sikurezza.org/sullivan
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