lckpwdf creates /etc/.pwd.lock + ulckpwdf fails to remove /etc/.pwd.lock

Bug #1252292 reported by David Favor on 2013-11-18
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
shadow (Ubuntu)
Undecided
Unassigned

Bug Description

For the simple program...

#include <stdio.h>
#include <shadow.h>
int main (void) {
   int status = lckpwdf();
   status = ulckpwdf();
   return status;
}

gcc -o simple simple.c

strace ./simple 2>&1 | egrep 'pwd|lckpwdf|ulckpwdf'
open("/etc/.pwd.lock", O_WRONLY|O_CREAT|O_CLOEXEC, 0600) = 3

It appears the macro lckpwdf creates /etc/.pwd.lock + macro ulckpwdf fails to delete this file.

So running a program like vipw creates both /etc/.pwd.lock + /etc/passwd.lock files or
vigr creates both /etc/.pwd.lock + /etc/group.log and in both cases after vipw or vigr
exit /etc/.pwd.lock remains.

Seth Arnold (seth-arnold) wrote :

-rw------- 1 root root 0 Aug 23 2012 /etc/.pwd.lock

Changed in shadow (Ubuntu):
status: New → Confirmed
DiagonalArg (diagonalarg) wrote :

I am running Ubuntu Gnome 16.04, and the /etc/.pwd.lock file has been on my machine since install. I checked a couple of 14.04 machines, and it's the same. That file is making duplicity backups of /etc fail.

DiagonalArg (diagonalarg) wrote :

I'll add that the same problem is reported at Red Hat: https://bugzilla.redhat.com/show_bug.cgi?id=428337

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