SUMMARY: chown

From: Nick Pettefar (Nick_at_Pettefar.com)
Date: 11/26/04

  • Next message: Miriam von Zuben: "Big disk in Ultra 5" 
    Date: Fri, 26 Nov 2004 01:47:03 +0100
To: sunmanagers@sunmanagers.org

    Thanks to Russell Page for a quick response and a detailed and accurate answer
    to my first question, which did the job perfectly!

    No one answered my second question about the security implications of modifying
    chown to allow users to give away ownership of their files.

    Regards,

    Nick@Pettefar.com DoD 1069 MAG 73516 Bros 650 ZZR1100D R90s Z88s

    > Two questions about chown, if you have the time...
    >
    > 1) Is it possible to change the variable rstchown to 0 without rebooting?
    > Everything I can find tells me to put it in /etc/system and reboot, but
    > I don't want to reboot our webserver (uptime 1 year!) for only this change.

    You can change many kernel variables on the fly with adb(1):

    $ su
    Password:
    # adb -w -k /dev/ksyms /dev/mem
    physmem 79a4
    rstchown/D
    rstchown:
    rstchown: 1
    rstchown/W 0
    rstchown: 0x1 = 0x0
    rstchown/D
    rstchown:
    rstchown: 0
    ^D
    # exit
    $ ls -l foo
    -rw-r--r-- 1 russell staff 0 Nov 26 09:31 foo
    $ chown root foo
    $ ls -l foo
    -rw-r--r-- 1 root staff 0 Nov 26 09:31 foo
    $
    "rstchown/D" prints the current value as a decimal number.
    "rstchown/W 0" sets the value to zero. You can only change values if you
    start adb with the -w option.

    You should change /etc/system anyway, so that the variable is set after your
    next reboot.

    A useful reference is the "Solaris Tuneable Parameters Reference Manual".

    http://docs.sun.com/app/docs/doc/806-4015

    -- Russell Page.
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