Re: [PATCH 1/1] Fix permission checking by NFS client for open-create with mode 000

["J. Bruce Fields" <bfields@fieldses.org>]

On Wed, Jul 09, 2014 at 07:12:09PM -0400, Trond Myklebust wrote:
> Oops. Sorry, the correct sub-sub-sub-sub-....paragraph is this one:
> 
>          Permission to execute a file.
> 
>          Servers SHOULD allow a user the ability to read the data of the
>          file when only the ACE4_EXECUTE access mask bit is allowed.
>          This is because there is no way to execute a file without
>          reading the contents.  Though a server may treat ACE4_EXECUTE
>          and ACE4_READ_DATA bits identically when deciding to permit a
>          READ operation, it SHOULD still allow the two bits to be set
>          independently in ACLs, and MUST distinguish between them when
>          replying to ACCESS operations.  In particular, servers SHOULD
>          NOT silently turn on one of the two bits when the other is set,
>          as that would make it impossible for the client to correctly
>          enforce the distinction between read and execute permissions.
> 
> 
> > To me that translates as saying that the server SHOULD accept an
> > OPEN(SHARE_ACCESS_READ|SHARE_ACCESS_WRITE) request in the above
> > situation.
> 
> Same conclusion, though....

Are we sure that's not just a spec bug?

Allowing OPEN(BOTH) on a -wx file seems like a pretty weird result.

--b.