lkml.org 
[lkml]   [2014]   [Jul]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)
On Mon, Jun 30, 2014 at 01:40:40PM -0700, Andi Kleen wrote:
> David Drysdale <drysdale@google.com> writes:
>
> > Add a new O_BENEATH_ONLY flag for openat(2) which restricts the
> > provided path, rejecting (with -EACCES) paths that are not beneath
> > the provided dfd. In particular, reject:
> > - paths that contain .. components
> > - paths that begin with /
> > - symlinks that have paths as above.
>
> How about bind mounts?
>
> -Andi
>
> --
> ak@linux.intel.com -- Speaking for myself only

Bind mounts won't get rejected because they just look like normal
path components. In other words, if dir/subdir is a bind mount to
/root/dir then:
fd = openat(AT_FDCWD, "dir/subdir", O_RDONLY|O_BENEATH_ONLY);
will work fine.


\
 
 \ /
  Last update: 2014-07-01 12:41    [W:0.259 / U:5.292 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site