Re: [PATCH] nbd/server: Add --selinux-label option

[Daniel P . Berrangé]

On Thu, Jul 22, 2021 at 05:32:40PM +0100, Richard W.M. Jones wrote:
> Under SELinux, Unix domain sockets have two labels.  One is on the
> disk and can be set with commands such as chcon(1).  There is a
> different label stored in memory (called the process label).  This can
> only be set by the process creating the socket.  When using SELinux +
> SVirt and wanting qemu to be able to connect to a qemu-nbd instance,
> you must set both labels correctly first.
> 
> For qemu-nbd the options to set the second label are awkward.  You can
> create the socket in a wrapper program and then exec into qemu-nbd.
> Or you could try something with LD_PRELOAD.
> 
> This commit adds the ability to set the label straightforwardly on the
> command line, via the new --selinux-label flag.  (The name of the flag
> is the same as the equivalent nbdkit option.)
> 
> A worked example showing how to use the new option can be found in
> this bug: https://bugzilla.redhat.com/show_bug.cgi?id=1984938
> 
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1984938
> Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
> ---
>  configure         |  9 ++++++++-
>  meson.build       | 10 +++++++++-
>  meson_options.txt |  3 +++
>  qemu-nbd.c        | 33 +++++++++++++++++++++++++++++++++
>  4 files changed, 53 insertions(+), 2 deletions(-)


> diff --git a/meson.build b/meson.build
> index 2f377098d7..2d7206233e 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1064,6 +1064,11 @@ keyutils = dependency('libkeyutils', required: false,
>  
>  has_gettid = cc.has_function('gettid')
>  
> +# libselinux
> +selinux = dependency('libselinux',
> +                     required: get_option('selinux'),
> +                     method: 'pkg-config', kwargs: static_kwargs)
> +

For the new build dep we'll need updated package lists in
tests/docker/dockerfiles. For centos, fedra ,opensuse
add libselinux-devel and for ubuntu 18/20 add libselinux-dev

That'll make sure this new code gets tested in CI.


The rest looks ok to me

Regards,
Daniel
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