topic Re: Question on /dev in Operating System - HP-UX

Question on /dev

joe_91 — Tue, 23 Jul 2002 18:57:31 GMT

Hi There:

I am watching on my production box the permissions of certain character specific files as world writable. I am attaching the output of ll /dev. Can the gurus help here. Is there something wrong with these permissions. Also /dev/null ..it should be world writable right?? Please ignore the permission on the vg's.

Thanks in advance,
Joe.

Re: Question on /dev

Hai Nguyen_1 — Tue, 23 Jul 2002 19:02:12 GMT

Your dev files' permissions look good to me. The /dev/null file's modebit is also correct.

Hai

Re: Question on /dev

Joseph C. Denman — Tue, 23 Jul 2002 19:04:18 GMT

Hi Joe,

I compared your listing to a listing of a couple of my servers.

Looks good to me.

Hope this helps.

Joe....

Re: Question on /dev

Martin Johnson — Tue, 23 Jul 2002 20:16:16 GMT

/dev/null, better known as the bit bucket, is used when you want to suppress/ignore output.

HTH
Marty

Re: Question on /dev

Bill Hassell — Tue, 23 Jul 2002 21:46:49 GMT

Normally, 666 or 777 files or directories are a possible problem. For all of the device files listed, they are fine. The tty device files must start as 666 since they can be used by anybody. Ownership will change dynamically due to the way daemons handle them.

There is one bad permission: vg04

It looks like it may have been created when umask was set to 000...not good. Make sure that umask 077 or at least umask 022 is in /etc/profile and /etc/csh.login. The correct permission foe vg04 is 700 or perhaps 755. ALL device files inside /dev/vg* should be 640. You don't want anyone to read the logical volumes directly. Same with /dev/dsk and /dev/rdsk...no world readable (and certainly no world writable) disk device files.

Re: Question on /dev

Fragon — Tue, 23 Jul 2002 23:06:05 GMT

I have examined mine, nothing abnormal!

ux