Date: Mon, 11 Jan 1999 23:54:43 -0500 (EST) From: Peter Philipp <pjp@bsd-daemon.net> To: freebsd-questions@FreeBSD.ORG Subject: XF86 3.3.3 and secure kernel level? Message-ID: <Pine.BSF.4.01.9901112333140.4234-100000@bsd-daemon.net>
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I've noticed that I can't (x)start XF86 3.3.3 which is distributed in the
2.2.8-RELEASE when my kernel secure level is > 0.
If this has already been mentioned in -stable I apologize I'm not
currently subscribed to that list (forwards of discussions there welcome).
The problem I have noticed is the following...
Fatal server error:
xf86OpenConsole: KDENABIO failed (Operation not permitted)
I've noticed on line 318 of
/usr/X11R6/src/xc/programs/Xserver/hw/xfree86/os-support/bsd/bsd_init.c
an ioctl to KDENABIO is attempted if the following is true:
#if defined (SYSCONS_SUPPORT) || defined (PCVT_SUPPORT)
case SYSCONS:
case PCVT:
...
further, the call does fail as I've tried to track down why and it seems
in the kernel in /usr/src/sys/i386/isa/syscons.c on line 1813 as the ioctl
for KDENABIO returns with EPERM (yup like above) if securelevel is higher
than 0.
case KDENABIO: /* allow io operations */
error = suser(p->p_ucred, &p->p_acflag);
if (error != 0)
return error;
if (securelevel > 0)
return EPERM;
...
getting to the obvious questions,
1. What security implications would follow if the securelevel check was
bypassed allowing KDENABIO in secure kernel levels?
2. Is there a workaround with xf86 3.3.3 that anyone knows of allowing
higher secure kernel levels with X?
3. Is there anything obvious that I might have missed advising of this?
sources and distribution all from 2.2.8-RELEASE as used in my environment.
Peter Philipp (PP2441)
Daemonic Networks
"In theory, theory is the same as practice, but not in practice" - ???
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