On Fri, Feb 2, 2018 at 4:23 PM, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:
> redirect_dir=nofollow should not follow a redirect. But in a specific
> configuration it can still follow it. For example try this.
>
> $ mkdir -p lower0 lower1/foo upper work merged
> $ touch lower1/foo/lower-file.txt
> $ setfattr -n "trusted.overlay.opaque" -v "y" lower1/foo
> $ mount -t overlay -o lowerdir=lower1:lower0,workdir=work,upperdir=upper,redirect_dir=on none merged
> $ cd merged
> $ mv foo foo-renamed
> $ umount merged
>
> # mount again. This time with redirect_dir=nofollow
> $ mount -t overlay -o lowerdir=lower1:lower0,workdir=work,upperdir=upper,redirect_dir=nofollow none merged
> $ ls merged/foo-renamed/
> # This lists lower-file.txt, while it should not have.
>
> Basically, we are doing redirect check after we check for d.stop. And
> if this is not last lower, and we find an opaque lower, d.stop will be
> set.
>
> ovl_lookup_single()
> if (!d->last && ovl_is_opaquedir(this)) {
> d->stop = d->opaque = true;
> goto out;
> }
>
> To fix this, first check redirect is allowed. And after that check if
> d.stop has been set or not.
>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Thanks, applied.
Miklos
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