bin/47362: cron is too restrictive on file permissions

[marcotte%panix.com@localhost]

>Number:         47362
>Category:       bin
>Synopsis:       cron is too restrictive on file permissions
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 24 17:10:00 +0000 2012
>Originator:     Brian Marcotte
>Release:        NetBSD 6.0
>Organization:
        Public Access Networks, Corp.
>Environment:
System: NetBSD k1.nyc.access.net 6.0 NetBSD 6.0 (PANIX-XEN-STD) #0: Sun Oct 14 
15:57:33 EDT 2012 
root%juggler.panix.com@localhost:/misc/obj/misc/devel/netbsd/6.0/src/sys/arch/i386/compile/PANIX-XEN-STD
 i386
Architecture: i386
Machine: i386
>Description:
We were getting these in the syslogs when we upgraded to NetBSD 6:

        (root) BAD FILE MODE (tabs/root)

The file is read-only because it is in RCS:

        -r--------  1 root  wheel  961 Mar 13  2012 /var/cron/tabs/root

I don't believe it's a security problem for the file to be read-only by
root. Cron should allow this mode.

>How-To-Repeat:
        
>Fix:
In src/external/bsd/cron/dist/database.c, process_crontab():

I'm not sure why "eqmode" is needed at all. It seems to me that just
setting "badmode" to 077 is enough (which may get changed to 022 if
fname is NULL).