[libvirt] [PATCH 25/30] security: selinux: Simplify SetImageLabelInternal

[Daniel Henrique Barboza]

On 10/7/19 6:49 PM, Cole Robinson wrote:
> All the SetFileCon calls only differ by the label they pass in.
> Rework the conditionals to track what label we need, and use a
> single SetFileCon call
>
> Signed-off-by: Cole Robinson <crobinso at redhat.com>
> ---

Reviewed-by: Daniel Henrique Barboza <danielhb413 at gmail.com>

>   src/security/security_selinux.c | 31 ++++++++++---------------------
>   1 file changed, 10 insertions(+), 21 deletions(-)
>
> diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
> index e879fa39ab..9d28bc5773 100644
> --- a/src/security/security_selinux.c
> +++ b/src/security/security_selinux.c
> @@ -1822,6 +1822,7 @@ virSecuritySELinuxSetImageLabelInternal(virSecurityManagerPtr mgr,
>       virSecurityLabelDefPtr secdef;
>       virSecurityDeviceLabelDefPtr disk_seclabel;
>       virSecurityDeviceLabelDefPtr parent_seclabel = NULL;
> +    char *use_label = NULL;
>       bool remember;
>       int ret;
>   
> @@ -1856,40 +1857,28 @@ virSecuritySELinuxSetImageLabelInternal(virSecurityManagerPtr mgr,
>           if (!disk_seclabel->relabel)
>               return 0;
>   
> -        ret = virSecuritySELinuxSetFilecon(mgr, src->path,
> -                                           disk_seclabel->label, remember);
> +        use_label = disk_seclabel->label;
>       } else if (parent_seclabel && (!parent_seclabel->relabel || parent_seclabel->label)) {
>           if (!parent_seclabel->relabel)
>               return 0;
>   
> -        ret = virSecuritySELinuxSetFilecon(mgr, src->path,
> -                                           parent_seclabel->label, remember);
> +        use_label = parent_seclabel->label;
>       } else if (!parent || parent == src) {
>           if (src->shared) {
> -            ret = virSecuritySELinuxSetFilecon(mgr,
> -                                               src->path,
> -                                               data->file_context,
> -                                               remember);
> +            use_label = data->file_context;
>           } else if (src->readonly) {
> -            ret = virSecuritySELinuxSetFilecon(mgr,
> -                                               src->path,
> -                                               data->content_context,
> -                                               remember);
> +            use_label = data->content_context;
>           } else if (secdef->imagelabel) {
> -            ret = virSecuritySELinuxSetFilecon(mgr,
> -                                               src->path,
> -                                               secdef->imagelabel,
> -                                               remember);
> +            use_label = secdef->imagelabel;
>           } else {
> -            ret = 0;
> +            return 0;
>           }
>       } else {
> -        ret = virSecuritySELinuxSetFilecon(mgr,
> -                                           src->path,
> -                                           data->content_context,
> -                                           remember);
> +        use_label = data->content_context;
>       }
>   
> +    ret = virSecuritySELinuxSetFilecon(mgr, src->path, use_label, remember);
> +
>       if (ret == 1 && !disk_seclabel) {
>           /* If we failed to set a label, but virt_use_nfs let us
>            * proceed anyway, then we don't need to relabel later.  */