Date: Thu, 13 Nov 2003 01:36:41 -0800 (PST) From: Charlie & <root@nerdinthebox.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/59257: modified fire_saver can halt kernel Message-ID: <200311130936.hAD9afjc001283@ntest.nerdinthebox.com> Resent-Message-ID: <200311131800.hADI0auA039702@freefall.freebsd.org>
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>Number: 59257
>Category: bin
>Synopsis: modified fire_saver can halt kernel
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 13 10:00:36 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Charlie &
>Release: FreeBSD 4.9-STABLE i386
>Organization:
>Environment:
>Description:
While fooling around with fire_saver.c I've found that changing the Y_SIZE during the iteration in the /* fade the flames out */ you can effectively crash the system
This is quite undesireable, since a total system halt, without a single warning is not so good. It's not good to crash OS with software.
>How-To-Repeat:
Change the following lines
/* fade the flames out
for (y = 0; y < Y_SIZE; y++) {
to
/* fade the flames out
for (y = 0; y < Y_SIZE+10; y++) {
kldunload fire_saver; kldload fire_saver
>Fix:
Don't increase Y_SIZE.
>Release-Note:
>Audit-Trail:
>Unformatted:
>System: FreeBSD ntest.nnnnn.com 4.9-STABLE FreeBSD 4.9-STABLE #0: Wed Nov 12 19:00:06 PST 2003 root@ntest.nnnnnn.com:/usr/obj/usr/src/sys/NTEST i386
<machine, os, target, libraries (multiple lines)>
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