Miklos Szeredi wrote:
> > Yes, for NFSv2, this test in nfs_permssion():
> >
> > if (!NFS_PROTO(inode)->access)
> > goto out;
>
> I've seen that, I just thought that was for some broken servers not
> for all NFSv2 servers.
>
> Anyway that's been fixed in NFSv3, so obviously the "permission
> checking on both sides" wasn't optimal :)
>
> > And for either version of NFS, if the uid and gid are non-zero, and
> > the permission bits indicate that an access is permitted, then the
> > client does not consult the server for permission.
>
> Where's that? I see no such check.
/*
* Trust UNIX mode bits except:
*
* 1) When override capabilities may have been invoked
* 2) When root squashing may be involved
* 3) When ACLs may overturn a negative answer */
if (!capable(CAP_DAC_OVERRIDE) && !capable(CAP_DAC_READ_SEARCH)
&& (current->fsuid != 0) && (current->fsgid != 0)
&& error != -EACCES)
goto out;
-- Jamie
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