[PATCH 0/3] Add O_DENY* flags to fcntl and cifs

Alan Cox alan at lxorguk.ukuu.org.uk
Fri Dec 7 15:35:20 CST 2012

> The problem is the possibility of denial-of-service attacks here. We 
> can try to prevent them by:
> 1) specifying an extra security bit on the file that indicates that 
> share flags are accepted (like we have for mandatory locks now) and 
> setting it for neccessary files only, or
> 2) adding a special mount option (but it it probably makes sense if we 
> decided to add this support for CIFS and NFS only).

3) making it a property that the process opts into - the same fs can have
Linux and wine users at once.

But for such a big set of changes and with the kind of potential fallout
you need to demonstrate a good practical use case IMHO, not just a "neat
idea I had".


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