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Full Discussion: locked out of RHEL 4 system
Top Forums UNIX for Advanced & Expert Users locked out of RHEL 4 system Post 302476799 by tabini on Friday 3rd of December 2010 10:29:13 AM
Old 12-03-2010
Quote:
Originally Posted by jim mcnamara
You have a couple of choices

boot from cdrom - mount the / filesystem manually, make changes

boot to runlevel 1 - and if you can get in as root, make changes.

Thanks, but like I said, I still have an open session. I just need to know what needs to be done to fix this.

I have already restored the file, but still, no one can login in. I have even replaced the file from an equivelent system via scp (which is still working), but that did not work either. So, it is not the file itself that is munged.

Thanks!

---------- Post updated 12-03-10 at 11:29 AM ---------- Previous update was 12-02-10 at 04:35 PM ----------

Another internal admin figured this out. Hope this helps someone else.

Doing a "su - user" (were user is some system account) also produces the error as I mentioned.

So, "strace su - user" actually points directly to the issue.

open("/var/log/lastlog", O_RDWR) = -1 EFBIG (File too large)

Looking at /var/log/lastlog shows the reported file size to big for the filesystem. It's a sparse file. lol. Sweet. Nuke it, touch it. Viola. Working again.

T.
 

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PAM_LOGINUID(8) 						 Linux-PAM Manual						   PAM_LOGINUID(8)

NAME
pam_loginuid - Record user's login uid to the process attribute SYNOPSIS
pam_loginuid.so [require_auditd] DESCRIPTION
The pam_loginuid module sets the loginuid process attribute for the process that was authenticated. This is necessary for applications to be correctly audited. This PAM module should only be used for entry point applications like: login, sshd, gdm, vsftpd, crond and atd. There are probably other entry point applications besides these. You should not use it for applications like sudo or su as that defeats the purpose by changing the loginuid to the account they just switched to. OPTIONS
require_auditd This option, when given, will cause this module to query the audit daemon status and deny logins if it is not running. MODULE TYPES PROVIDED
Only the session module type is provided. RETURN VALUES
PAM_SESSION_ERR An error occurred during session management. EXAMPLES
#%PAM-1.0 auth required pam_unix.so auth required pam_nologin.so account required pam_unix.so password required pam_unix.so session required pam_unix.so session required pam_loginuid.so SEE ALSO
pam.conf(5), pam.d(5), pam(7), auditctl(8), auditd(8) AUTHOR
pam_loginuid was written by Steve Grubb <sgrubb@redhat.com> Linux-PAM Manual 06/04/2011 PAM_LOGINUID(8)
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