[Virtio-fs] [PATCH for-5.1 1/3] virtiofsd: drop CAP_DAC_READ_SEARCH

[Dr. David Alan Gilbert]

* Stefan Hajnoczi (stefanha at redhat.com) wrote:
> virtiofsd does not need CAP_DAC_READ_SEARCH because it already has
> the more powerful CAP_DAC_OVERRIDE. Drop it from the list of
> capabilities.
> 
> This is important because container runtimes may not include
> CAP_DAC_READ_SEARCH by default. This patch allows virtiofsd to reduce
> its capabilities when running inside a Docker container.
> 
> Note that CAP_DAC_READ_SEARCH may be necessary again in the future if
> virtiofsd starts using open_by_handle_at(2).
> 
> Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>

Yeh that seems to make sense, and is probably worth having irrespective
of the rest of the series.


Reviewed-by: Dr. David Alan Gilbert <dgilbert at redhat.com>

> ---
>  tools/virtiofsd/passthrough_ll.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
> index 94e0de2d2b..50a164a599 100644
> --- a/tools/virtiofsd/passthrough_ll.c
> +++ b/tools/virtiofsd/passthrough_ll.c
> @@ -2596,7 +2596,6 @@ static void setup_capabilities(char *modcaps_in)
>      if (capng_updatev(CAPNG_ADD, CAPNG_PERMITTED | CAPNG_EFFECTIVE,
>              CAP_CHOWN,
>              CAP_DAC_OVERRIDE,
> -            CAP_DAC_READ_SEARCH,
>              CAP_FOWNER,
>              CAP_FSETID,
>              CAP_SETGID,
> -- 
> 2.26.2
> 
--
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK