linux-kernel - Re: [PATCH v2] selinux: vsock: Set SID for socket returned by accept()

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Message-ID: <YFSnb/kGpn7xPPR8@google.com>
Date:   Fri, 19 Mar 2021 13:30:23 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     selinux@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        Jeff Vander Stoep <jeffv@...gle.com>,
        Alistair Delva <adelva@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] selinux: vsock: Set SID for socket returned by
 accept()

On Fri, Mar 19, 2021 at 01:05:41PM +0000, David Brazdil wrote:
> For AF_VSOCK, accept() currently returns sockets that are unlabelled.
> Other socket families derive the child's SID from the SID of the parent
> and the SID of the incoming packet. This is typically done as the
> connected socket is placed in the queue that accept() removes from.
> 
> Reuse the existing 'security_sk_clone' hook to copy the SID from the
> parent (server) socket to the child. There is no packet SID in this
> case.
> 
> Fixes: d021c344051a ("VSOCK: Introduce VM Sockets")
Cc: <stable@...r.kernel.org>
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>
> ---
> Tested on Android AOSP and Fedora 33 with v5.12-rc3.
> Unit test is available here:
>   https://github.com/SELinuxProject/selinux-testsuite/pull/75
> 
> Changes since v1:
>   * reuse security_sk_clone instead of adding a new hook
> 
>  net/vmw_vsock/af_vsock.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
> index 5546710d8ac1..bc7fb9bf3351 100644
> --- a/net/vmw_vsock/af_vsock.c
> +++ b/net/vmw_vsock/af_vsock.c
> @@ -755,6 +755,7 @@ static struct sock *__vsock_create(struct net *net,
>  		vsk->buffer_size = psk->buffer_size;
>  		vsk->buffer_min_size = psk->buffer_min_size;
>  		vsk->buffer_max_size = psk->buffer_max_size;
> +		security_sk_clone(parent, sk);
>  	} else {
>  		vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN);
>  		vsk->owner = get_current_cred();
> -- 
> 2.31.0.rc2.261.g7f71774620-goog
>