Re: SECURITY.NNOV: file locking and security (group policy DoS on Windows 2000 domain)

From: Seth Arnold (sarnoldat_private)
Date: Fri Dec 07 2001 - 17:15:48 PST

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    On Fri, Dec 07, 2001 at 11:57:58AM +0300, 3APA3A wrote:
    > The way file locks interfere with file access depends on OS. There are 2
    > possible  situations:  moderate  and  non-moderate  file locks. *BSD and
    > linux  use  non-moderate  locking, while Windows NT locking is moderate.
    > What  does it mean? Under Unix file locking is only checked then another
    > application  tries  to  lock  the  file. If application doesn't use file
    > locking  it  will  not be affected by file locking.
    
    3APA3A -- close....
    
    A long-time feature of many Unix systems, including Linux (and probably
    all the BSDs too, but I don't know this for sure) is mandatory file
    locking, implemented in the kernel. It can be turned on using the setgid
    bit on regular files.
    
    Look for Documentation/mandatory.txt in the linux kernel source tree. It
    has all the gory details on mandary file locking, as it is implemented
    in the linux kernel. (Or, was implemented, in 1996.. :)
    
    Cheers!
    
    -- 
    People who separate manpages from the programs
    they document would steal sheep.  -- apologies to Goudy
    
    
    



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