[libvirt] [PATCHv2] virt-aa-helper: Fix permissions for vhost-user socket files

[Michal Privoznik]

On 22.06.2015 12:47, Michal Dubiel wrote:
> QEMU working in vhost-user mode communicates with the other end (i.e.
> some virtual router application) via unix domain sockets. This requires
> that permissions for the socket files are correctly written into
> /etc/apparmor.d/libvirt/libvirt-UUID.files.
> 
> Signed-off-by: Michal Dubiel <md at semihalf.com>
> ---
> Changes since v1:
> - Removed unnecessary stat() call and dead 'else' block
> 
>  src/security/virt-aa-helper.c | 25 ++++++++++++-------------
>  1 file changed, 12 insertions(+), 13 deletions(-)
> 
> diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-helper.c
> index 35423b5..f39932e 100644
> --- a/src/security/virt-aa-helper.c
> +++ b/src/security/virt-aa-helper.c
> @@ -32,7 +32,6 @@
>  #include <unistd.h>
>  #include <errno.h>
>  #include <sys/types.h>
> -#include <sys/stat.h>
>  #include <fcntl.h>
>  #include <getopt.h>
>  #include <sys/utsname.h>
> @@ -542,7 +541,6 @@ array_starts_with(const char *str, const char * const *arr, const long size)
>  static int
>  valid_path(const char *path, const bool readonly)
>  {
> -    struct stat sb;
>      int npaths, opaths;
>      const char * const restricted[] = {
>          "/bin/",
> @@ -592,17 +590,6 @@ valid_path(const char *path, const bool readonly)
>  
>      if (!virFileExists(path)) {
>          vah_warning(_("path does not exist, skipping file type checks"));
> -    } else {
> -        if (stat(path, &sb) == -1)
> -            return -1;
> -
> -        switch (sb.st_mode & S_IFMT) {
> -            case S_IFSOCK:
> -                return 1;
> -                break;
> -            default:
> -                break;
> -        }
>      }

This leaves a one line body to the if(). Therefore 'syntax-check' is
sad. With that fixed I'm inclined to ACK the patch. But I'm not too
familiar with AppArmor, so unless somebody else gives another ACK, I'll
push this after the release.

>  
>      opaths = sizeof(override)/sizeof(*(override));
> @@ -1101,6 +1088,18 @@ get_files(vahControl * ctl)
>          }
>      }
>  
> +    for (i = 0; i < ctl->def->nnets; i++) {
> +        if (ctl->def->nets[i] &&
> +                ctl->def->nets[i]->type == VIR_DOMAIN_NET_TYPE_VHOSTUSER &&
> +                ctl->def->nets[i]->data.vhostuser) {
> +            virDomainChrSourceDefPtr vhu = ctl->def->nets[i]->data.vhostuser;
> +
> +            if (vah_add_file_chardev(&buf, vhu->data.nix.path, "rw",
> +                       vhu->type) != 0)
> +                goto cleanup;
> +        }
> +    }
> +
>      if (ctl->def->virtType == VIR_DOMAIN_VIRT_KVM) {
>          for (i = 0; i < ctl->def->nnets; i++) {
>              virDomainNetDefPtr net = ctl->def->nets[i];
> 

Michal