Weird behavior with /dev/mem
Doug White
dwhite at gumbysoft.com
Fri Oct 31 11:36:17 PST 2003
On Fri, 31 Oct 2003, Daniel C. Sobral wrote:
> Weird thing. I updated my system today (October 31), and now I can't
> list routes from syscons. But I still can list routes from Konsole, on
> X. Following a suggestion by Genesys, I checked permissions of /dev/mem
> and netstat and... for some reason, I can't stat /dev/mem under syscons!
You didn't mount that filesystem nosuid, did you?
> Here are a couple of typescripts I got:
>
> [0] dcs at dcs:/opt/home/dcs$ cat from_konsole
> Script started on Fri Oct 31 17:25:04 2003
> dcs at dcs:/opt/home/dcs$ ls -ld /dev
> dr-xr-xr-x 4 root wheel 512 Oct 31 13:56 /dev
> dcs at dcs:/opt/home/dcs$ ls -l /dev/mem
> crw-r----- 1 root kmem 2, 0 Oct 31 15:54 /dev/mem
> dcs at dcs:/opt/home/dcs$ ls -l /usr/bin/netstat
> -r-xr-sr-x 1 root kmem 108664 Oct 31 13:18 /usr/bin/netstat
> dcs at dcs:/opt/home/dcs$ netstat -nr
> Routing tables
>
> Internet:
> Destination Gateway Flags Refs Use Netif Expire
> default 10.0.11.1 UGSc 0 0 fxp0
> 10/16 link#1 UC 0 0 fxp0
> 10.0.2.72 00:04:23:2a:13:7b UHLW 0 1 fxp0 881
> 10.0.11.1 00:10:54:cd:58:40 UHLW 28 0 fxp0 1197
> 10.0.12.131 00:01:30:26:e0:00 UHLW 0 0 fxp0 1186
> 10.0.14.20 00:02:55:58:22:0a UHLW 6 39928 fxp0 975
> 127.0.0.1 127.0.0.1 UH 0 6 lo0
> dcs at dcs:/opt/home/dcs$ exit
> exit
>
> Script done on Fri Oct 31 17:25:20 2003
> [0] dcs at dcs:/opt/home/dcs$ cat from_syscons
> Script started on Fri Oct 31 17:26:01 2003
> root at dcs:/root$ ls -ld /dev
> dr-xr-xr-x 4 root wheel 512 Oct 31 13:56 /dev
> root at dcs:/root$ ls -l /dev/mem
> ls: /dev/mem: Permission denied
> root at dcs:/root$ ls -l /usr/bin/netstat
> -r-xr-sr-x 1 root kmem 108664 Oct 31 13:18 /usr/bin/netstat
> root at dcs:/root$ netstat -nr
> netstat: kvm not available
> Routing tables
> rt_tables: symbol not in namelist
> root at dcs:/root$ exit
> exit
>
> Script done on Fri Oct 31 17:26:18 2003
> [0] dcs at dcs:/opt/home/dcs$ which ls
> /bin/ls
> [0] dcs at dcs:/opt/home/dcs$ type ls
> ls is aliased to `ls -G'
> [0] dcs at dcs:/opt/home/dcs$ unalias ls
> [0] dcs at dcs:/opt/home/dcs$ ls -l /dev/mem
> crw-r----- 1 root kmem 2, 0 Oct 31 15:54 /dev/mem
>
> I'm CCing phk on the grounds of Mr Devfs, and Sam as I blamed the
> networking code earlier... :-)
>
>
--
Doug White | FreeBSD: The Power to Serve
dwhite at gumbysoft.com | www.FreeBSD.org
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