Weird behavior with /dev/mem
Daniel C. Sobral
dcs at tcoip.com.br
Fri Oct 31 11:44:39 PST 2003
Doug White wrote:
> 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?
No. And, as a matter of fact, the error is user-agnostic. In fact, in
the example below the problem happen with the root user, while user dcs
is home free.
MMmmmm... I know what it is. It's something with mac, because X is run
with /usr/sbin/setpmac mls/equal. (tests) Yep, that's it.
Ok, rwatson, it's all your fault. Sneaky, sneaky.
>
>
>>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... :-)
>>
>>
>
>
--
Daniel C. Sobral (8-DCS)
Gerencia de Operacoes
Divisao de Comunicacao de Dados
Coordenacao de Seguranca
VIVO Centro Oeste Norte
Fones: 55-61-313-7654/Cel: 55-61-9618-0904
E-mail: Daniel.Capo at tco.net.br
Daniel.Sobral at tcoip.com.br
dcs at tcoip.com.br
Outros:
dcs at newsguy.com
dcs at freebsd.org
capo at notorious.bsdconspiracy.net
Ten years of rejection slips is nature's
way of telling you to stop writing.
-- R. Geis
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