Weird behavior with /dev/mem

From: Daniel C. Sobral (dcs_at_tcoip.com.br)
Date: 10/31/03

  • Next message: Doug White: "Re: Weird behavior with /dev/mem" 
    Date: Fri, 31 Oct 2003 17:31:33 -0200
To: Current <current@freebsd.org>, Sam Leffler <sam@freebsd.org>, Poul-Henning Kamp <phk@freebsd.org>

    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!
    Here are a couple of typescripts I got:

    [0] dcs@dcs:/opt/home/dcs$ cat from_konsole
    Script started on Fri Oct 31 17:25:04 2003
    dcs@dcs:/opt/home/dcs$ ls -ld /dev
    dr-xr-xr-x 4 root wheel 512 Oct 31 13:56 /dev
    dcs@dcs:/opt/home/dcs$ ls -l /dev/mem
    crw-r----- 1 root kmem 2, 0 Oct 31 15:54 /dev/mem
    dcs@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@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@dcs:/opt/home/dcs$ exit
    exit

    Script done on Fri Oct 31 17:25:20 2003
    [0] dcs@dcs:/opt/home/dcs$ cat from_syscons
    Script started on Fri Oct 31 17:26:01 2003
    root@dcs:/root$ ls -ld /dev
    dr-xr-xr-x 4 root wheel 512 Oct 31 13:56 /dev
    root@dcs:/root$ ls -l /dev/mem
    ls: /dev/mem: Permission denied
    root@dcs:/root$ ls -l /usr/bin/netstat
    -r-xr-sr-x 1 root kmem 108664 Oct 31 13:18 /usr/bin/netstat
    root@dcs:/root$ netstat -nr
    netstat: kvm not available
    Routing tables
    rt_tables: symbol not in namelist
    root@dcs:/root$ exit
    exit

    Script done on Fri Oct 31 17:26:18 2003
    [0] dcs@dcs:/opt/home/dcs$ which ls
    /bin/ls
    [0] dcs@dcs:/opt/home/dcs$ type ls
    ls is aliased to `ls -G'
    [0] dcs@dcs:/opt/home/dcs$ unalias ls
    [0] dcs@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@tco.net.br
         Daniel.Sobral@tcoip.com.br
         dcs@tcoip.com.br
Outros:
	dcs@newsguy.com
	dcs@freebsd.org
	capo@notorious.bsdconspiracy.net
Ignisecond, n.:
	The overlapping moment of time when the hand is locking the car
door even as the brain is saying, "my keys are in there!"
		-- Rich Hall, "Sniglets"
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  • Next message: Doug White: "Re: Weird behavior with /dev/mem"