topic dmesg and /dev/kmem in Operating System - HP-UX

dmesg and /dev/kmem

motorola_austin — Tue, 12 Jun 2001 18:03:20 GMT

We are running HP-UX 11.0 on 9000 class machines.

What should the permissions be for dmesg and /dev/kmem ? dmesg only works for user root because /dev/kmem is not readable for everyone. Some casual users need to run dmesg to get the Physical memory info.
(We do not have dmesg dumping to /var/adm/messages.)

Solaris has 3555 permissions on for dmesg and 640 for kmem. I checked a HP 9000 server in another admin group we have and they had /dev/kmem set at 644 and dmesg at 555 which allows dmesg to work for common users.

Here is what I have:
crw-r----- 1 bin sys 3 0x000001 Jan 19 2000 /dev/kmem
-r-xr-xr-x 1 bin bin 155648 Nov 7 1997 /sbin/dmesg

Re: dmesg and /dev/kmem

A. Clay Stephenson — Tue, 12 Jun 2001 18:11:39 GMT

I would set /dev/mem and /dev/kmem to 644 but make sure that it is owned by root. 555 for dmesg and again owned by root.

Clay

Re: dmesg and /dev/kmem

A. Clay Stephenson — Tue, 12 Jun 2001 18:12:52 GMT

Hi again,

Be awrare that dmesg will not always display memory; dmesh uses a circular buffer and once that is overwritten; the initial data is gone.