Re: Weird behavior with /dev/mem

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

  • Next message: Lars Eggert: "Re: Toshiba Portege R100: 5.1-JPSNAP install CD hangs" 
    Date: Fri, 31 Oct 2003 17:44:32 -0200
To: Doug White <dwhite@gumbysoft.com>

    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@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
Ten years of rejection slips is nature's
way of telling you to stop writing.
		-- R. Geis
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