[1598] in linux-security and linux-alert archive
[linux-security] Re: Root vulnerabilities in Linux
daemon@ATHENA.MIT.EDU (Andrea Arcangeli)
Mon Sep 1 11:55:33 1997
Date: Sun, 31 Aug 1997 21:08:58 +0200 (CEST)
From: Andrea Arcangeli <arcangeli@mbox.queen.it>
To: linux-security@redhat.com
In-Reply-To: <Pine.LNX.3.96.970828131933.9134A-100000@sisko.cs.twsu.edu>
Resent-From: linux-security@redhat.com
Reply-To: linux-security@redhat.com
On Thu, 28 Aug 1997, John Goerzen wrote:
>NOTE: I haven't checked it out, but the other escapes to single-user mode
>in RedHat may be an issue too (for instance, if a fsck fails)
This is the part of /etc/init.d/boot that is the script executed at boot
by init.
[..]
echo "Checking root file system..."
fsck -a /
#
# If there was a failure, drop into single-user mode.
#
# NOTE: "failure" is defined as exiting with a return code of
# 2 or larger. A return code of 1 indicates that file system
# errors were corrected but that the boot may proceed.
#
if [ $? -gt 1 ]
then
# Surprise! Re-directing from a HERE document (as in
# "cat << EOF") won't work, because the root is read-only.
echo
echo "fsck failed. Please repair manually and reboot. Please note"
echo "that the root file system is currently mounted read-only. To"
echo "remount it read-write:"
echo
echo " # mount -n -o remount,rw /"
echo
echo "CONTROL-D will exit from this shell and REBOOT the system."
echo
# Start a single user shell on the console
/sbin/sulogin $CONSOLE
reboot -f
fi
[..]
As you can see in Debian if the fsck fail, you will get some advice,
sulogin and then a system reboot.
[mod: Latest redhat ask you for root's password - alex]
Andrea Arcangeli
